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Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/Callback.java')
| -rwxr-xr-x | bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/Callback.java | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/Callback.java b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/Callback.java deleted file mode 100755 index 145d49c2f5..0000000000 --- a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/Callback.java +++ /dev/null @@ -1,251 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2000, 2004 IBM Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Eclipse Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/epl-v10.html - * - * Contributors: - * IBM Corporation - initial API and implementation - *******************************************************************************/ -package org.eclipse.swt.internal; - - -/** - * Instances of this class represent entry points into Java - * which can be invoked from operating system level callback - * routines. - * <p> - * IMPORTANT: A callback is only valid when invoked on the - * thread which created it. The results are undefined (and - * typically bad) when a callback is passed out to the - * operating system (or other code) in such a way that the - * callback is called from a different thread. - */ - -public class Callback { - - Object object; - String method, signature; - int argCount; - int /*long*/ address, errorResult; - boolean isStatic, isArrayBased; - - /* Load the SWT library */ - static { - Library.loadLibrary ("swt"); //$NON-NLS-1$ - } - - static final int PTR_SIZEOF = PTR_sizeof(); - static final String PTR_SIGNATURE = PTR_SIZEOF == 4 ? "I" : "J"; //$NON-NLS-1$ //$NON-NLS-2$ - static final String SIGNATURE_0 = getSignature(0); - static final String SIGNATURE_1 = getSignature(1); - static final String SIGNATURE_2 = getSignature(2); - static final String SIGNATURE_3 = getSignature(3); - static final String SIGNATURE_4 = getSignature(4); - static final String SIGNATURE_N = "(["+PTR_SIGNATURE+")"+PTR_SIGNATURE; //$NON-NLS-1$ //$NON-NLS-2$ - -/** - * Constructs a new instance of this class given an object - * to send the message to, a string naming the method to - * invoke and an argument count. Note that, if the object - * is an instance of <code>Class</code> it is assumed that - * the method is a static method on that class. - * - * @param object the object to send the message to - * @param method the name of the method to invoke - * @param argCount the number of arguments that the method takes - */ -public Callback (Object object, String method, int argCount) { - this (object, method, argCount, false); -} - -/** - * Constructs a new instance of this class given an object - * to send the message to, a string naming the method to - * invoke, an argument count and a flag indicating whether - * or not the arguments will be passed in an array. Note - * that, if the object is an instance of <code>Class</code> - * it is assumed that the method is a static method on that - * class. - * - * @param object the object to send the message to - * @param method the name of the method to invoke - * @param argCount the number of arguments that the method takes - * @param isArrayBased <code>true</code> if the arguments should be passed in an array and false otherwise - */ -public Callback (Object object, String method, int argCount, boolean isArrayBased) { - this (object, method, argCount, isArrayBased, 0); -} - -/** - * Constructs a new instance of this class given an object - * to send the message to, a string naming the method to - * invoke, an argument count, a flag indicating whether - * or not the arguments will be passed in an array and a value - * to return when an exception happens. Note that, if - * the object is an instance of <code>Class</code> - * it is assumed that the method is a static method on that - * class. - * - * @param object the object to send the message to - * @param method the name of the method to invoke - * @param argCount the number of arguments that the method takes - * @param isArrayBased <code>true</code> if the arguments should be passed in an array and false otherwise - * @param errorResult the return value if the java code throws an exception - */ -public Callback (Object object, String method, int argCount, boolean isArrayBased, int /*long*/ errorResult) { - - /* Set the callback fields */ - this.object = object; - this.method = method; - this.argCount = argCount; - this.isStatic = object instanceof Class; - this.isArrayBased = isArrayBased; - this.errorResult = errorResult; - - /* Inline the common cases */ - if (isArrayBased) { - signature = SIGNATURE_N; - } else { - switch (argCount) { - case 0: signature = SIGNATURE_0; break; //$NON-NLS-1$ - case 1: signature = SIGNATURE_1; break; //$NON-NLS-1$ - case 2: signature = SIGNATURE_2; break; //$NON-NLS-1$ - case 3: signature = SIGNATURE_3; break; //$NON-NLS-1$ - case 4: signature = SIGNATURE_4; break; //$NON-NLS-1$ - default: - signature = getSignature(argCount); - } - } - - /* Bind the address */ - address = bind (this, object, method, signature, argCount, isStatic, isArrayBased, errorResult); -} - -static final native int PTR_sizeof (); - -/** - * Allocates the native level resources associated with the - * callback. This method is only invoked from within the - * constructor for the argument. - * - * @param callback the callback to bind - * @param object the callback's object - * @param method the callback's method - * @param signature the callback's method signature - * @param argCount the callback's method argument count - * @param isStatic whether the callback's method is static - * @param isArrayBased whether the callback's method is array based - * @param errorResult the callback's error result - */ -static native synchronized int /*long*/ bind (Callback callback, Object object, String method, String signature, int argCount, boolean isStatic, boolean isArrayBased, int /*long*/ errorResult); - -/** - * Releases the native level resources associated with the callback, - * and removes all references between the callback and - * other objects. This helps to prevent (bad) application code - * from accidentally holding onto extraneous garbage. - */ -public void dispose () { - if (object == null) return; - unbind (this); - object = method = signature = null; - address = 0; -} - -/** - * Returns the address of a block of machine code which will - * invoke the callback represented by the receiver. - * - * @return the callback address - */ -public int /*long*/ getAddress () { - return address; -} - -/** - * Returns the SWT platform name. - * - * @return the platform name of the currently running SWT - */ -public static native String getPlatform (); - -/** - * Returns the number of times the system has been recursively entered - * through a callback. - * <p> - * Note: This should not be called by application code. - * </p> - * - * @return the entry count - * - * @since 2.1 - */ -public static native int getEntryCount (); - -static String getSignature(int argCount) { - String signature = "("; //$NON-NLS-1$ - for (int i = 0; i < argCount; i++) signature += PTR_SIGNATURE; - signature += ")" + PTR_SIGNATURE; //$NON-NLS-1$ - return signature; -} - -/** - * Indicates whether or not callbacks which are triggered at the - * native level should cause the messages described by the matching - * <code>Callback</code> objects to be invoked. This method is used - * to safely shut down SWT when it is run within environments - * which can generate spurious events. - * <p> - * Note: This should not be called by application code. - * </p> - * - * @param enable true if callbacks should be invoked - */ -public static final native synchronized void setEnabled (boolean enable); - -/** - * Returns whether or not callbacks which are triggered at the - * native level should cause the messages described by the matching - * <code>Callback</code> objects to be invoked. This method is used - * to safely shut down SWT when it is run within environments - * which can generate spurious events. - * <p> - * Note: This should not be called by application code. - * </p> - * - * @return true if callbacks should not be invoked - */ -public static final native synchronized boolean getEnabled (); - -/** - * This might be called directly from native code in environments - * which can generate spurious events. Check before removing it. - * - * @deprecated - * - * @param ignore true if callbacks should not be invoked - */ -static final void ignoreCallbacks (boolean ignore) { - setEnabled (!ignore); -} - -/** - * Immediately wipes out all native level state associated - * with <em>all</em> callbacks. - * <p> - * <b>WARNING:</b> This operation is <em>extremely</em> dangerous, - * and should never be performed by application code. - * </p> - */ -public static final native synchronized void reset (); - -/** - * Releases the native level resources associated with the callback. - * - * @see #dispose - */ -static final native synchronized void unbind (Callback callback); - -} |