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Diffstat (limited to 'openjdk/java/lang/System.java')
| -rw-r--r-- | openjdk/java/lang/System.java | 1168 |
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diff --git a/openjdk/java/lang/System.java b/openjdk/java/lang/System.java deleted file mode 100644 index e74187b9..00000000 --- a/openjdk/java/lang/System.java +++ /dev/null @@ -1,1168 +0,0 @@ -/* - * Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ -package java.lang; - -import java.io.*; -import java.util.Properties; -import java.util.PropertyPermission; -import java.util.StringTokenizer; -import java.security.AccessController; -import java.security.PrivilegedAction; -import java.security.AllPermission; -import java.nio.channels.Channel; -import java.nio.channels.spi.SelectorProvider; -import sun.reflect.CallerSensitive; -import sun.reflect.Reflection; -import sun.security.util.SecurityConstants; - -final class StdIO -{ - private StdIO() { } - static InputStream in = new BufferedInputStream(new FileInputStream(FileDescriptor.in)); - static PrintStream out = new PrintStream(new BufferedOutputStream(new FileOutputStream(FileDescriptor.out), 128), true); - static PrintStream err = new PrintStream(new BufferedOutputStream(new FileOutputStream(FileDescriptor.err), 128), true); -} - -final class Props -{ - private Props() { } - - static Properties props; - static String lineSeparator; - - static - { - props = new Properties(); - VMSystemProperties.initProperties(props); - lineSeparator = props.getProperty("line.separator"); - - // after we've initialized the system properties, we need to fixate certain - // results that depend on system properties, because we don't want Java code to - // be able to change the behavior by setting these system properties. - ClassLoader.initializeLibraryPaths(props); - sun.misc.VM.saveAndRemoveProperties(props); - - // now that we've initialized the system properties (which are our only - // notion of "booting" the VM) we set the booted flag. - sun.misc.VM.booted(); - } -} - -/** - * The <code>System</code> class contains several useful class fields - * and methods. It cannot be instantiated. - * - * <p>Among the facilities provided by the <code>System</code> class - * are standard input, standard output, and error output streams; - * access to externally defined properties and environment - * variables; a means of loading files and libraries; and a utility - * method for quickly copying a portion of an array. - * - * @author unascribed - * @since JDK1.0 - */ -public final class System { - - /** Don't let anyone instantiate this class */ - private System() { - } - - /** - * The "standard" input stream. This stream is already - * open and ready to supply input data. Typically this stream - * corresponds to keyboard input or another input source specified by - * the host environment or user. - */ - @ikvm.lang.Property(get="get_in") - public final static InputStream in; - - static { in = null; } - - private static InputStream get_in() - { - return StdIO.in; - } - - /** - * The "standard" output stream. This stream is already - * open and ready to accept output data. Typically this stream - * corresponds to display output or another output destination - * specified by the host environment or user. - * <p> - * For simple stand-alone Java applications, a typical way to write - * a line of output data is: - * <blockquote><pre> - * System.out.println(data) - * </pre></blockquote> - * <p> - * See the <code>println</code> methods in class <code>PrintStream</code>. - * - * @see java.io.PrintStream#println() - * @see java.io.PrintStream#println(boolean) - * @see java.io.PrintStream#println(char) - * @see java.io.PrintStream#println(char[]) - * @see java.io.PrintStream#println(double) - * @see java.io.PrintStream#println(float) - * @see java.io.PrintStream#println(int) - * @see java.io.PrintStream#println(long) - * @see java.io.PrintStream#println(java.lang.Object) - * @see java.io.PrintStream#println(java.lang.String) - */ - @ikvm.lang.Property(get="get_out") - public final static PrintStream out; - - static { out = null; } - - private static PrintStream get_out() - { - return StdIO.out; - } - - /** - * The "standard" error output stream. This stream is already - * open and ready to accept output data. - * <p> - * Typically this stream corresponds to display output or another - * output destination specified by the host environment or user. By - * convention, this output stream is used to display error messages - * or other information that should come to the immediate attention - * of a user even if the principal output stream, the value of the - * variable <code>out</code>, has been redirected to a file or other - * destination that is typically not continuously monitored. - */ - @ikvm.lang.Property(get="get_err") - public final static PrintStream err; - - static { err = null ; } - - private static PrintStream get_err() - { - return StdIO.err; - } - - /* The security manager for the system. - */ - private static volatile SecurityManager security; - - /** - * Reassigns the "standard" input stream. - * - * <p>First, if there is a security manager, its <code>checkPermission</code> - * method is called with a <code>RuntimePermission("setIO")</code> permission - * to see if it's ok to reassign the "standard" input stream. - * <p> - * - * @param in the new standard input stream. - * - * @throws SecurityException - * if a security manager exists and its - * <code>checkPermission</code> method doesn't allow - * reassigning of the standard input stream. - * - * @see SecurityManager#checkPermission - * @see java.lang.RuntimePermission - * - * @since JDK1.1 - */ - public static void setIn(InputStream in) { - checkIO(); - StdIO.in = in; - } - - /** - * Reassigns the "standard" output stream. - * - * <p>First, if there is a security manager, its <code>checkPermission</code> - * method is called with a <code>RuntimePermission("setIO")</code> permission - * to see if it's ok to reassign the "standard" output stream. - * - * @param out the new standard output stream - * - * @throws SecurityException - * if a security manager exists and its - * <code>checkPermission</code> method doesn't allow - * reassigning of the standard output stream. - * - * @see SecurityManager#checkPermission - * @see java.lang.RuntimePermission - * - * @since JDK1.1 - */ - public static void setOut(PrintStream out) { - checkIO(); - StdIO.out = out; - } - - /** - * Reassigns the "standard" error output stream. - * - * <p>First, if there is a security manager, its <code>checkPermission</code> - * method is called with a <code>RuntimePermission("setIO")</code> permission - * to see if it's ok to reassign the "standard" error output stream. - * - * @param err the new standard error output stream. - * - * @throws SecurityException - * if a security manager exists and its - * <code>checkPermission</code> method doesn't allow - * reassigning of the standard error output stream. - * - * @see SecurityManager#checkPermission - * @see java.lang.RuntimePermission - * - * @since JDK1.1 - */ - public static void setErr(PrintStream err) { - checkIO(); - StdIO.err = err; - } - - private static volatile Console cons; - /** - * Returns the unique {@link java.io.Console Console} object associated - * with the current Java virtual machine, if any. - * - * @return The system console, if any, otherwise <tt>null</tt>. - * - * @since 1.6 - */ - public static Console console() { - if (cons == null) { - synchronized (System.class) { - cons = sun.misc.SharedSecrets.getJavaIOAccess().console(); - } - } - return cons; - } - - /** - * Returns the channel inherited from the entity that created this - * Java virtual machine. - * - * <p> This method returns the channel obtained by invoking the - * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel - * inheritedChannel} method of the system-wide default - * {@link java.nio.channels.spi.SelectorProvider} object. </p> - * - * <p> In addition to the network-oriented channels described in - * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel - * inheritedChannel}, this method may return other kinds of - * channels in the future. - * - * @return The inherited channel, if any, otherwise <tt>null</tt>. - * - * @throws IOException - * If an I/O error occurs - * - * @throws SecurityException - * If a security manager is present and it does not - * permit access to the channel. - * - * @since 1.5 - */ - public static Channel inheritedChannel() throws IOException { - return SelectorProvider.provider().inheritedChannel(); - } - - private static void checkIO() { - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPermission(new RuntimePermission("setIO")); - } - } - - /** - * Sets the System security. - * - * <p> If there is a security manager already installed, this method first - * calls the security manager's <code>checkPermission</code> method - * with a <code>RuntimePermission("setSecurityManager")</code> - * permission to ensure it's ok to replace the existing - * security manager. - * This may result in throwing a <code>SecurityException</code>. - * - * <p> Otherwise, the argument is established as the current - * security manager. If the argument is <code>null</code> and no - * security manager has been established, then no action is taken and - * the method simply returns. - * - * @param s the security manager. - * @exception SecurityException if the security manager has already - * been set and its <code>checkPermission</code> method - * doesn't allow it to be replaced. - * @see #getSecurityManager - * @see SecurityManager#checkPermission - * @see java.lang.RuntimePermission - */ - public static - void setSecurityManager(final SecurityManager s) { - try { - s.checkPackageAccess("java.lang"); - } catch (Exception e) { - // no-op - } - setSecurityManager0(s); - } - - private static synchronized - void setSecurityManager0(final SecurityManager s) { - // [IKVM] force sun.misc.Launcher to initialize, because it assumes that it runs without a SecurityManager - sun.misc.Launcher.getLauncher(); - - SecurityManager sm = getSecurityManager(); - if (sm != null) { - // ask the currently installed security manager if we - // can replace it. - sm.checkPermission(new RuntimePermission - ("setSecurityManager")); - } - - if ((s != null) && (s.getClass().getClassLoader() != null)) { - // New security manager class is not on bootstrap classpath. - // Cause policy to get initialized before we install the new - // security manager, in order to prevent infinite loops when - // trying to initialize the policy (which usually involves - // accessing some security and/or system properties, which in turn - // calls the installed security manager's checkPermission method - // which will loop infinitely if there is a non-system class - // (in this case: the new security manager class) on the stack). - AccessController.doPrivileged(new PrivilegedAction<Object>() { - public Object run() { - s.getClass().getProtectionDomain().implies - (SecurityConstants.ALL_PERMISSION); - return null; - } - }); - } - - security = s; - } - - /** - * Gets the system security interface. - * - * @return if a security manager has already been established for the - * current application, then that security manager is returned; - * otherwise, <code>null</code> is returned. - * @see #setSecurityManager - */ - public static SecurityManager getSecurityManager() { - return security; - } - - /** - * Returns the current time in milliseconds. Note that - * while the unit of time of the return value is a millisecond, - * the granularity of the value depends on the underlying - * operating system and may be larger. For example, many - * operating systems measure time in units of tens of - * milliseconds. - * - * <p> See the description of the class <code>Date</code> for - * a discussion of slight discrepancies that may arise between - * "computer time" and coordinated universal time (UTC). - * - * @return the difference, measured in milliseconds, between - * the current time and midnight, January 1, 1970 UTC. - * @see java.util.Date - */ - public static long currentTimeMillis() { - long january_1st_1970 = 62135596800000L; - return cli.System.DateTime.get_UtcNow().get_Ticks() / 10000L - january_1st_1970; - } - - /** - * Returns the current value of the running Java Virtual Machine's - * high-resolution time source, in nanoseconds. - * - * <p>This method can only be used to measure elapsed time and is - * not related to any other notion of system or wall-clock time. - * The value returned represents nanoseconds since some fixed but - * arbitrary <i>origin</i> time (perhaps in the future, so values - * may be negative). The same origin is used by all invocations of - * this method in an instance of a Java virtual machine; other - * virtual machine instances are likely to use a different origin. - * - * <p>This method provides nanosecond precision, but not necessarily - * nanosecond resolution (that is, how frequently the value changes) - * - no guarantees are made except that the resolution is at least as - * good as that of {@link #currentTimeMillis()}. - * - * <p>Differences in successive calls that span greater than - * approximately 292 years (2<sup>63</sup> nanoseconds) will not - * correctly compute elapsed time due to numerical overflow. - * - * <p>The values returned by this method become meaningful only when - * the difference between two such values, obtained within the same - * instance of a Java virtual machine, is computed. - * - * <p> For example, to measure how long some code takes to execute: - * <pre> {@code - * long startTime = System.nanoTime(); - * // ... the code being measured ... - * long estimatedTime = System.nanoTime() - startTime;}</pre> - * - * <p>To compare two nanoTime values - * <pre> {@code - * long t0 = System.nanoTime(); - * ... - * long t1 = System.nanoTime();}</pre> - * - * one should use {@code t1 - t0 < 0}, not {@code t1 < t0}, - * because of the possibility of numerical overflow. - * - * @return the current value of the running Java Virtual Machine's - * high-resolution time source, in nanoseconds - * @since 1.5 - */ - public static long nanoTime() { - long NANOS_PER_SEC = 1000000000; - double current = cli.System.Diagnostics.Stopwatch.GetTimestamp(); - double freq = cli.System.Diagnostics.Stopwatch.Frequency; - return (long)((current / freq) * NANOS_PER_SEC); - } - - /** - * Copies an array from the specified source array, beginning at the - * specified position, to the specified position of the destination array. - * A subsequence of array components are copied from the source - * array referenced by <code>src</code> to the destination array - * referenced by <code>dest</code>. The number of components copied is - * equal to the <code>length</code> argument. The components at - * positions <code>srcPos</code> through - * <code>srcPos+length-1</code> in the source array are copied into - * positions <code>destPos</code> through - * <code>destPos+length-1</code>, respectively, of the destination - * array. - * <p> - * If the <code>src</code> and <code>dest</code> arguments refer to the - * same array object, then the copying is performed as if the - * components at positions <code>srcPos</code> through - * <code>srcPos+length-1</code> were first copied to a temporary - * array with <code>length</code> components and then the contents of - * the temporary array were copied into positions - * <code>destPos</code> through <code>destPos+length-1</code> of the - * destination array. - * <p> - * If <code>dest</code> is <code>null</code>, then a - * <code>NullPointerException</code> is thrown. - * <p> - * If <code>src</code> is <code>null</code>, then a - * <code>NullPointerException</code> is thrown and the destination - * array is not modified. - * <p> - * Otherwise, if any of the following is true, an - * <code>ArrayStoreException</code> is thrown and the destination is - * not modified: - * <ul> - * <li>The <code>src</code> argument refers to an object that is not an - * array. - * <li>The <code>dest</code> argument refers to an object that is not an - * array. - * <li>The <code>src</code> argument and <code>dest</code> argument refer - * to arrays whose component types are different primitive types. - * <li>The <code>src</code> argument refers to an array with a primitive - * component type and the <code>dest</code> argument refers to an array - * with a reference component type. - * <li>The <code>src</code> argument refers to an array with a reference - * component type and the <code>dest</code> argument refers to an array - * with a primitive component type. - * </ul> - * <p> - * Otherwise, if any of the following is true, an - * <code>IndexOutOfBoundsException</code> is - * thrown and the destination is not modified: - * <ul> - * <li>The <code>srcPos</code> argument is negative. - * <li>The <code>destPos</code> argument is negative. - * <li>The <code>length</code> argument is negative. - * <li><code>srcPos+length</code> is greater than - * <code>src.length</code>, the length of the source array. - * <li><code>destPos+length</code> is greater than - * <code>dest.length</code>, the length of the destination array. - * </ul> - * <p> - * Otherwise, if any actual component of the source array from - * position <code>srcPos</code> through - * <code>srcPos+length-1</code> cannot be converted to the component - * type of the destination array by assignment conversion, an - * <code>ArrayStoreException</code> is thrown. In this case, let - * <b><i>k</i></b> be the smallest nonnegative integer less than - * length such that <code>src[srcPos+</code><i>k</i><code>]</code> - * cannot be converted to the component type of the destination - * array; when the exception is thrown, source array components from - * positions <code>srcPos</code> through - * <code>srcPos+</code><i>k</i><code>-1</code> - * will already have been copied to destination array positions - * <code>destPos</code> through - * <code>destPos+</code><i>k</I><code>-1</code> and no other - * positions of the destination array will have been modified. - * (Because of the restrictions already itemized, this - * paragraph effectively applies only to the situation where both - * arrays have component types that are reference types.) - * - * @param src the source array. - * @param srcPos starting position in the source array. - * @param dest the destination array. - * @param destPos starting position in the destination data. - * @param length the number of array elements to be copied. - * @exception IndexOutOfBoundsException if copying would cause - * access of data outside array bounds. - * @exception ArrayStoreException if an element in the <code>src</code> - * array could not be stored into the <code>dest</code> array - * because of a type mismatch. - * @exception NullPointerException if either <code>src</code> or - * <code>dest</code> is <code>null</code>. - */ - public static native void arraycopy(Object src, int srcPos, - Object dest, int destPos, - int length); - - /** - * Returns the same hash code for the given object as - * would be returned by the default method hashCode(), - * whether or not the given object's class overrides - * hashCode(). - * The hash code for the null reference is zero. - * - * @param x object for which the hashCode is to be calculated - * @return the hashCode - * @since JDK1.1 - */ - public static int identityHashCode(Object x) { - return cli.System.Runtime.CompilerServices.RuntimeHelpers.GetHashCode(x); - } - - /** - * System properties. The following properties are guaranteed to be defined: - * <dl> - * <dt>java.version <dd>Java version number - * <dt>java.vendor <dd>Java vendor specific string - * <dt>java.vendor.url <dd>Java vendor URL - * <dt>java.home <dd>Java installation directory - * <dt>java.class.version <dd>Java class version number - * <dt>java.class.path <dd>Java classpath - * <dt>os.name <dd>Operating System Name - * <dt>os.arch <dd>Operating System Architecture - * <dt>os.version <dd>Operating System Version - * <dt>file.separator <dd>File separator ("/" on Unix) - * <dt>path.separator <dd>Path separator (":" on Unix) - * <dt>line.separator <dd>Line separator ("\n" on Unix) - * <dt>user.name <dd>User account name - * <dt>user.home <dd>User home directory - * <dt>user.dir <dd>User's current working directory - * </dl> - */ - - //private static native Properties initProperties(Properties props); - - /** - * Determines the current system properties. - * <p> - * First, if there is a security manager, its - * <code>checkPropertiesAccess</code> method is called with no - * arguments. This may result in a security exception. - * <p> - * The current set of system properties for use by the - * {@link #getProperty(String)} method is returned as a - * <code>Properties</code> object. If there is no current set of - * system properties, a set of system properties is first created and - * initialized. This set of system properties always includes values - * for the following keys: - * <table summary="Shows property keys and associated values"> - * <tr><th>Key</th> - * <th>Description of Associated Value</th></tr> - * <tr><td><code>java.version</code></td> - * <td>Java Runtime Environment version</td></tr> - * <tr><td><code>java.vendor</code></td> - * <td>Java Runtime Environment vendor</td></tr - * <tr><td><code>java.vendor.url</code></td> - * <td>Java vendor URL</td></tr> - * <tr><td><code>java.home</code></td> - * <td>Java installation directory</td></tr> - * <tr><td><code>java.vm.specification.version</code></td> - * <td>Java Virtual Machine specification version</td></tr> - * <tr><td><code>java.vm.specification.vendor</code></td> - * <td>Java Virtual Machine specification vendor</td></tr> - * <tr><td><code>java.vm.specification.name</code></td> - * <td>Java Virtual Machine specification name</td></tr> - * <tr><td><code>java.vm.version</code></td> - * <td>Java Virtual Machine implementation version</td></tr> - * <tr><td><code>java.vm.vendor</code></td> - * <td>Java Virtual Machine implementation vendor</td></tr> - * <tr><td><code>java.vm.name</code></td> - * <td>Java Virtual Machine implementation name</td></tr> - * <tr><td><code>java.specification.version</code></td> - * <td>Java Runtime Environment specification version</td></tr> - * <tr><td><code>java.specification.vendor</code></td> - * <td>Java Runtime Environment specification vendor</td></tr> - * <tr><td><code>java.specification.name</code></td> - * <td>Java Runtime Environment specification name</td></tr> - * <tr><td><code>java.class.version</code></td> - * <td>Java class format version number</td></tr> - * <tr><td><code>java.class.path</code></td> - * <td>Java class path</td></tr> - * <tr><td><code>java.library.path</code></td> - * <td>List of paths to search when loading libraries</td></tr> - * <tr><td><code>java.io.tmpdir</code></td> - * <td>Default temp file path</td></tr> - * <tr><td><code>java.compiler</code></td> - * <td>Name of JIT compiler to use</td></tr> - * <tr><td><code>java.ext.dirs</code></td> - * <td>Path of extension directory or directories</td></tr> - * <tr><td><code>os.name</code></td> - * <td>Operating system name</td></tr> - * <tr><td><code>os.arch</code></td> - * <td>Operating system architecture</td></tr> - * <tr><td><code>os.version</code></td> - * <td>Operating system version</td></tr> - * <tr><td><code>file.separator</code></td> - * <td>File separator ("/" on UNIX)</td></tr> - * <tr><td><code>path.separator</code></td> - * <td>Path separator (":" on UNIX)</td></tr> - * <tr><td><code>line.separator</code></td> - * <td>Line separator ("\n" on UNIX)</td></tr> - * <tr><td><code>user.name</code></td> - * <td>User's account name</td></tr> - * <tr><td><code>user.home</code></td> - * <td>User's home directory</td></tr> - * <tr><td><code>user.dir</code></td> - * <td>User's current working directory</td></tr> - * </table> - * <p> - * Multiple paths in a system property value are separated by the path - * separator character of the platform. - * <p> - * Note that even if the security manager does not permit the - * <code>getProperties</code> operation, it may choose to permit the - * {@link #getProperty(String)} operation. - * - * @return the system properties - * @exception SecurityException if a security manager exists and its - * <code>checkPropertiesAccess</code> method doesn't allow access - * to the system properties. - * @see #setProperties - * @see java.lang.SecurityException - * @see java.lang.SecurityManager#checkPropertiesAccess() - * @see java.util.Properties - */ - public static Properties getProperties() { - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPropertiesAccess(); - } - - return Props.props; - } - - /** - * Returns the system-dependent line separator string. It always - * returns the same value - the initial value of the {@linkplain - * #getProperty(String) system property} {@code line.separator}. - * - * <p>On UNIX systems, it returns {@code "\n"}; on Microsoft - * Windows systems it returns {@code "\r\n"}. - */ - public static String lineSeparator() { - return Props.lineSeparator; - } - - /** - * Sets the system properties to the <code>Properties</code> - * argument. - * <p> - * First, if there is a security manager, its - * <code>checkPropertiesAccess</code> method is called with no - * arguments. This may result in a security exception. - * <p> - * The argument becomes the current set of system properties for use - * by the {@link #getProperty(String)} method. If the argument is - * <code>null</code>, then the current set of system properties is - * forgotten. - * - * @param props the new system properties. - * @exception SecurityException if a security manager exists and its - * <code>checkPropertiesAccess</code> method doesn't allow access - * to the system properties. - * @see #getProperties - * @see java.util.Properties - * @see java.lang.SecurityException - * @see java.lang.SecurityManager#checkPropertiesAccess() - */ - public static void setProperties(Properties props) { - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPropertiesAccess(); - } - if (props == null) { - props = new Properties(); - VMSystemProperties.initProperties(props); - } - Props.props = props; - } - - /** - * Gets the system property indicated by the specified key. - * <p> - * First, if there is a security manager, its - * <code>checkPropertyAccess</code> method is called with the key as - * its argument. This may result in a SecurityException. - * <p> - * If there is no current set of system properties, a set of system - * properties is first created and initialized in the same manner as - * for the <code>getProperties</code> method. - * - * @param key the name of the system property. - * @return the string value of the system property, - * or <code>null</code> if there is no property with that key. - * - * @exception SecurityException if a security manager exists and its - * <code>checkPropertyAccess</code> method doesn't allow - * access to the specified system property. - * @exception NullPointerException if <code>key</code> is - * <code>null</code>. - * @exception IllegalArgumentException if <code>key</code> is empty. - * @see #setProperty - * @see java.lang.SecurityException - * @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String) - * @see java.lang.System#getProperties() - */ - public static String getProperty(String key) { - checkKey(key); - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPropertyAccess(key); - } - - return Props.props.getProperty(key); - } - - /** - * Gets the system property indicated by the specified key. - * <p> - * First, if there is a security manager, its - * <code>checkPropertyAccess</code> method is called with the - * <code>key</code> as its argument. - * <p> - * If there is no current set of system properties, a set of system - * properties is first created and initialized in the same manner as - * for the <code>getProperties</code> method. - * - * @param key the name of the system property. - * @param def a default value. - * @return the string value of the system property, - * or the default value if there is no property with that key. - * - * @exception SecurityException if a security manager exists and its - * <code>checkPropertyAccess</code> method doesn't allow - * access to the specified system property. - * @exception NullPointerException if <code>key</code> is - * <code>null</code>. - * @exception IllegalArgumentException if <code>key</code> is empty. - * @see #setProperty - * @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String) - * @see java.lang.System#getProperties() - */ - public static String getProperty(String key, String def) { - checkKey(key); - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPropertyAccess(key); - } - - return Props.props.getProperty(key, def); - } - - /** - * Sets the system property indicated by the specified key. - * <p> - * First, if a security manager exists, its - * <code>SecurityManager.checkPermission</code> method - * is called with a <code>PropertyPermission(key, "write")</code> - * permission. This may result in a SecurityException being thrown. - * If no exception is thrown, the specified property is set to the given - * value. - * <p> - * - * @param key the name of the system property. - * @param value the value of the system property. - * @return the previous value of the system property, - * or <code>null</code> if it did not have one. - * - * @exception SecurityException if a security manager exists and its - * <code>checkPermission</code> method doesn't allow - * setting of the specified property. - * @exception NullPointerException if <code>key</code> or - * <code>value</code> is <code>null</code>. - * @exception IllegalArgumentException if <code>key</code> is empty. - * @see #getProperty - * @see java.lang.System#getProperty(java.lang.String) - * @see java.lang.System#getProperty(java.lang.String, java.lang.String) - * @see java.util.PropertyPermission - * @see SecurityManager#checkPermission - * @since 1.2 - */ - public static String setProperty(String key, String value) { - checkKey(key); - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPermission(new PropertyPermission(key, - SecurityConstants.PROPERTY_WRITE_ACTION)); - } - - return (String) Props.props.setProperty(key, value); - } - - /** - * Removes the system property indicated by the specified key. - * <p> - * First, if a security manager exists, its - * <code>SecurityManager.checkPermission</code> method - * is called with a <code>PropertyPermission(key, "write")</code> - * permission. This may result in a SecurityException being thrown. - * If no exception is thrown, the specified property is removed. - * <p> - * - * @param key the name of the system property to be removed. - * @return the previous string value of the system property, - * or <code>null</code> if there was no property with that key. - * - * @exception SecurityException if a security manager exists and its - * <code>checkPropertyAccess</code> method doesn't allow - * access to the specified system property. - * @exception NullPointerException if <code>key</code> is - * <code>null</code>. - * @exception IllegalArgumentException if <code>key</code> is empty. - * @see #getProperty - * @see #setProperty - * @see java.util.Properties - * @see java.lang.SecurityException - * @see java.lang.SecurityManager#checkPropertiesAccess() - * @since 1.5 - */ - public static String clearProperty(String key) { - checkKey(key); - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPermission(new PropertyPermission(key, "write")); - } - - return (String) Props.props.remove(key); - } - - private static void checkKey(String key) { - if (key == null) { - throw new NullPointerException("key can't be null"); - } - if (key.equals("")) { - throw new IllegalArgumentException("key can't be empty"); - } - } - - /** - * Gets the value of the specified environment variable. An - * environment variable is a system-dependent external named - * value. - * - * <p>If a security manager exists, its - * {@link SecurityManager#checkPermission checkPermission} - * method is called with a - * <code>{@link RuntimePermission}("getenv."+name)</code> - * permission. This may result in a {@link SecurityException} - * being thrown. If no exception is thrown the value of the - * variable <code>name</code> is returned. - * - * <p><a name="EnvironmentVSSystemProperties"><i>System - * properties</i> and <i>environment variables</i></a> are both - * conceptually mappings between names and values. Both - * mechanisms can be used to pass user-defined information to a - * Java process. Environment variables have a more global effect, - * because they are visible to all descendants of the process - * which defines them, not just the immediate Java subprocess. - * They can have subtly different semantics, such as case - * insensitivity, on different operating systems. For these - * reasons, environment variables are more likely to have - * unintended side effects. It is best to use system properties - * where possible. Environment variables should be used when a - * global effect is desired, or when an external system interface - * requires an environment variable (such as <code>PATH</code>). - * - * <p>On UNIX systems the alphabetic case of <code>name</code> is - * typically significant, while on Microsoft Windows systems it is - * typically not. For example, the expression - * <code>System.getenv("FOO").equals(System.getenv("foo"))</code> - * is likely to be true on Microsoft Windows. - * - * @param name the name of the environment variable - * @return the string value of the variable, or <code>null</code> - * if the variable is not defined in the system environment - * @throws NullPointerException if <code>name</code> is <code>null</code> - * @throws SecurityException - * if a security manager exists and its - * {@link SecurityManager#checkPermission checkPermission} - * method doesn't allow access to the environment variable - * <code>name</code> - * @see #getenv() - * @see ProcessBuilder#environment() - */ - public static String getenv(String name) { - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPermission(new RuntimePermission("getenv."+name)); - } - - return ProcessEnvironment.getenv(name); - } - - - /** - * Returns an unmodifiable string map view of the current system environment. - * The environment is a system-dependent mapping from names to - * values which is passed from parent to child processes. - * - * <p>If the system does not support environment variables, an - * empty map is returned. - * - * <p>The returned map will never contain null keys or values. - * Attempting to query the presence of a null key or value will - * throw a {@link NullPointerException}. Attempting to query - * the presence of a key or value which is not of type - * {@link String} will throw a {@link ClassCastException}. - * - * <p>The returned map and its collection views may not obey the - * general contract of the {@link Object#equals} and - * {@link Object#hashCode} methods. - * - * <p>The returned map is typically case-sensitive on all platforms. - * - * <p>If a security manager exists, its - * {@link SecurityManager#checkPermission checkPermission} - * method is called with a - * <code>{@link RuntimePermission}("getenv.*")</code> - * permission. This may result in a {@link SecurityException} being - * thrown. - * - * <p>When passing information to a Java subprocess, - * <a href=#EnvironmentVSSystemProperties>system properties</a> - * are generally preferred over environment variables. - * - * @return the environment as a map of variable names to values - * @throws SecurityException - * if a security manager exists and its - * {@link SecurityManager#checkPermission checkPermission} - * method doesn't allow access to the process environment - * @see #getenv(String) - * @see ProcessBuilder#environment() - * @since 1.5 - */ - public static java.util.Map<String,String> getenv() { - SecurityManager sm = getSecurityManager(); - if (sm != null) { - sm.checkPermission(new RuntimePermission("getenv.*")); - } - - return ProcessEnvironment.getenv(); - } - - /** - * Terminates the currently running Java Virtual Machine. The - * argument serves as a status code; by convention, a nonzero status - * code indicates abnormal termination. - * <p> - * This method calls the <code>exit</code> method in class - * <code>Runtime</code>. This method never returns normally. - * <p> - * The call <code>System.exit(n)</code> is effectively equivalent to - * the call: - * <blockquote><pre> - * Runtime.getRuntime().exit(n) - * </pre></blockquote> - * - * @param status exit status. - * @throws SecurityException - * if a security manager exists and its <code>checkExit</code> - * method doesn't allow exit with the specified status. - * @see java.lang.Runtime#exit(int) - */ - public static void exit(int status) { - Runtime.getRuntime().exit(status); - } - - /** - * Runs the garbage collector. - * <p> - * Calling the <code>gc</code> method suggests that the Java Virtual - * Machine expend effort toward recycling unused objects in order to - * make the memory they currently occupy available for quick reuse. - * When control returns from the method call, the Java Virtual - * Machine has made a best effort to reclaim space from all discarded - * objects. - * <p> - * The call <code>System.gc()</code> is effectively equivalent to the - * call: - * <blockquote><pre> - * Runtime.getRuntime().gc() - * </pre></blockquote> - * - * @see java.lang.Runtime#gc() - */ - public static void gc() { - Runtime.getRuntime().gc(); - } - - /** - * Runs the finalization methods of any objects pending finalization. - * <p> - * Calling this method suggests that the Java Virtual Machine expend - * effort toward running the <code>finalize</code> methods of objects - * that have been found to be discarded but whose <code>finalize</code> - * methods have not yet been run. When control returns from the - * method call, the Java Virtual Machine has made a best effort to - * complete all outstanding finalizations. - * <p> - * The call <code>System.runFinalization()</code> is effectively - * equivalent to the call: - * <blockquote><pre> - * Runtime.getRuntime().runFinalization() - * </pre></blockquote> - * - * @see java.lang.Runtime#runFinalization() - */ - public static void runFinalization() { - Runtime.getRuntime().runFinalization(); - } - - /** - * Enable or disable finalization on exit; doing so specifies that the - * finalizers of all objects that have finalizers that have not yet been - * automatically invoked are to be run before the Java runtime exits. - * By default, finalization on exit is disabled. - * - * <p>If there is a security manager, - * its <code>checkExit</code> method is first called - * with 0 as its argument to ensure the exit is allowed. - * This could result in a SecurityException. - * - * @deprecated This method is inherently unsafe. It may result in - * finalizers being called on live objects while other threads are - * concurrently manipulating those objects, resulting in erratic - * behavior or deadlock. - * @param value indicating enabling or disabling of finalization - * @throws SecurityException - * if a security manager exists and its <code>checkExit</code> - * method doesn't allow the exit. - * - * @see java.lang.Runtime#exit(int) - * @see java.lang.Runtime#gc() - * @see java.lang.SecurityManager#checkExit(int) - * @since JDK1.1 - */ - @Deprecated - public static void runFinalizersOnExit(boolean value) { - Runtime.getRuntime().runFinalizersOnExit(value); - } - - /** - * Loads a code file with the specified filename from the local file - * system as a dynamic library. The filename - * argument must be a complete path name. - * <p> - * The call <code>System.load(name)</code> is effectively equivalent - * to the call: - * <blockquote><pre> - * Runtime.getRuntime().load(name) - * </pre></blockquote> - * - * @param filename the file to load. - * @exception SecurityException if a security manager exists and its - * <code>checkLink</code> method doesn't allow - * loading of the specified dynamic library - * @exception UnsatisfiedLinkError if the file does not exist. - * @exception NullPointerException if <code>filename</code> is - * <code>null</code> - * @see java.lang.Runtime#load(java.lang.String) - * @see java.lang.SecurityManager#checkLink(java.lang.String) - */ - @CallerSensitive - public static void load(String filename) { - Runtime.getRuntime().load0(Reflection.getCallerClass(), filename); - } - - /** - * Loads the system library specified by the <code>libname</code> - * argument. The manner in which a library name is mapped to the - * actual system library is system dependent. - * <p> - * The call <code>System.loadLibrary(name)</code> is effectively - * equivalent to the call - * <blockquote><pre> - * Runtime.getRuntime().loadLibrary(name) - * </pre></blockquote> - * - * @param libname the name of the library. - * @exception SecurityException if a security manager exists and its - * <code>checkLink</code> method doesn't allow - * loading of the specified dynamic library - * @exception UnsatisfiedLinkError if the library does not exist. - * @exception NullPointerException if <code>libname</code> is - * <code>null</code> - * @see java.lang.Runtime#loadLibrary(java.lang.String) - * @see java.lang.SecurityManager#checkLink(java.lang.String) - */ - @CallerSensitive - public static void loadLibrary(String libname) { - Runtime.getRuntime().loadLibrary0(Reflection.getCallerClass(), libname); - } - - /** - * Maps a library name into a platform-specific string representing - * a native library. - * - * @param libname the name of the library. - * @return a platform-dependent native library name. - * @exception NullPointerException if <code>libname</code> is - * <code>null</code> - * @see java.lang.System#loadLibrary(java.lang.String) - * @see java.lang.ClassLoader#findLibrary(java.lang.String) - * @since 1.2 - */ - public static String mapLibraryName(String libname) { - if (libname == null) { - throw new NullPointerException(); - } - if (ikvm.internal.Util.WINDOWS) { - return libname + ".dll"; - } else if (ikvm.internal.Util.MACOSX) { - return "lib" + libname + ".jnilib"; - } else { - return "lib" + libname + ".so"; - } - } - /* returns the class of the caller. */ - static Class<?> getCallerClass() { - // NOTE use of more generic Reflection.getCallerClass() - return Reflection.getCallerClass(3); - } -} |