232 lines
6.9 KiB
Java
232 lines
6.9 KiB
Java
/*
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The contents of this file are subject to the THDL Open Community License
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Version 1.0 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License on the THDL web site
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(http://www.thdl.org/).
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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License for the specific terms governing rights and limitations under the
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License.
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The Initial Developer of this software is the Tibetan and Himalayan Digital
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Library (THDL). Portions created by the THDL are Copyright 2001 THDL.
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All Rights Reserved.
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Contributor(s): ______________________________________.
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*/
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package org.thdl.savant;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Field;
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import java.awt.Dimension;
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import java.awt.Frame;
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import java.awt.Toolkit;
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import javax.swing.JFrame;
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import org.thdl.util.ThdlLazyException;
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/**
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* @author David Chandler
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*
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* This class provides functionality that is not present in Java's JDK
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* 1.2. Because we want to compile and run on a Java 2/1.2 system, we
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* must use the Java Reflection API to provide functionality specific
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* to Java 2/1.3 or later. At present, I haven't tested on a 1.2 box,
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* but I have tested on a 1.3.1_04 box.
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*
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* If your code will break if some functionality here is not present,
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* test the return value of the function and throw an exception.
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* Avoid such code like the plague.
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*
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* This code is all written for one-shot operations thus-far. If you
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* plan on executing a piece of code many times, you need to set up
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* the reflection mechanism first, and then re-use it again and again.
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* This is a two-step process. Three steps if you explicitly
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* deconstruct the mechanism.
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*
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* This class is not instantiable. */
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public final class JdkVersionHacks {
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/** Don't instantiate this class. */
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private JdkVersionHacks() { }
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/** Calls f.setUndecorated(true) if possible. Returns true if
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successful. */
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public static boolean undecorateJFrame(JFrame f) {
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/* If we're using JDK 1.4, execute
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f.setUndecorated(true). Otherwise, don't. */
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boolean success = false;
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Method setUndecoratedMethod = null;
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try {
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setUndecoratedMethod
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= JFrame.class.getMethod("setUndecorated",
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new Class[] {
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Boolean.TYPE
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});
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} catch (NoSuchMethodException ex) {
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/* We're not using JDK 1.4 or later. */
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} catch (SecurityException ex) {
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/* We'll never know if we're using JDK 1.4 or later. */
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handleSecurityException(ex);
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return false;
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}
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if (setUndecoratedMethod != null) {
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try {
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setUndecoratedMethod.invoke(f, new Object[] { Boolean.TRUE });
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success = true;
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/* We shouldn't get any of these exceptions: */
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} catch (IllegalAccessException ex) {
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throw new ThdlLazyException(ex);
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} catch (IllegalArgumentException ex) {
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throw new ThdlLazyException(ex);
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} catch (InvocationTargetException ex) {
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throw new ThdlLazyException(ex);
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}
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}
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return success;
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}
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/** Calls f.setExtendedState(Frame.MAXIMIZED_BOTH) if possible.
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Returns true if successful. */
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public static boolean maximizeJFrameInBothDirections(JFrame f) {
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/* If we're using JDK 1.4, execute
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f.setExtendedState(Frame.MAXIMIZED_BOTH). Otherwise,
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don't. */
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boolean success = false;
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Method setExtendedStateMethod = null;
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try {
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setExtendedStateMethod
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= JFrame.class.getMethod("setExtendedState",
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new Class[] {
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Integer.TYPE
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});
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} catch (NoSuchMethodException ex) {
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/* We're not using JDK 1.4 or later. */
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return false;
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} catch (SecurityException ex) {
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/* We'll never know if we're using JDK 1.4 or later. */
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handleSecurityException(ex);
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return false;
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}
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try {
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setExtendedStateMethod.invoke(f,
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new Object[] {
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maximizedBothOption()
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});
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success = true;
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} catch (NoSuchFieldException ex) {
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/* We're not using JDK 1.4 or later. */
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return false;
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/* We shouldn't get any of these exceptions: */
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} catch (IllegalAccessException ex) {
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throw new ThdlLazyException(ex);
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} catch (IllegalArgumentException ex) {
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throw new ThdlLazyException(ex);
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} catch (InvocationTargetException ex) {
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throw new ThdlLazyException(ex);
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}
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return success;
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}
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/** Returns true iff maximizeJFrameInBothDirections(f) will
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actually have an effect. */
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public static boolean maximizedBothSupported(Toolkit tk) {
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// Execute
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// f.getToolkit().isFrameStateSupported(Frame.MAXIMIZED_BOTH)
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// if possible.
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boolean success = false;
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Method isFSSMethod = null;
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try {
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isFSSMethod
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= JFrame.class.getMethod("isFrameStateSupported",
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new Class[] {
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Integer.TYPE
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});
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} catch (NoSuchMethodException ex) {
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/* We're not using JDK 1.4 or later. */
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return false;
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} catch (SecurityException ex) {
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/* We'll never know if we're using JDK 1.4 or later. */
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handleSecurityException(ex);
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return false;
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}
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try {
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return ((Boolean)isFSSMethod.invoke(tk,
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new Object[] {
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maximizedBothOption()
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})).booleanValue();
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} catch (NoSuchFieldException ex) {
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/* We're not using JDK 1.4 or later. */
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return false;
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/* We shouldn't get any of these exceptions: */
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} catch (IllegalAccessException ex) {
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throw new ThdlLazyException(ex);
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} catch (IllegalArgumentException ex) {
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throw new ThdlLazyException(ex);
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} catch (InvocationTargetException ex) {
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throw new ThdlLazyException(ex);
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}
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}
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/** Coming soon: Does what the user desires (via the options he or
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she has set) with this SecurityException, one encountered
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during the process of reflection.
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Currently: does nothing.
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FIXME */
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private static void handleSecurityException(SecurityException ex)
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throws SecurityException
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{
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if (false /* FIXME: I want this exception when debugging: THDLUtils.getBooleanOption("EagerlyThrowExceptions") */)
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throw ex;
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}
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/** Returns the value of Frame.MAXIMIZED_BOTH, wrapped in an
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Integer.
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@throws NoSuchFieldException the field does not exist or
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cannot be accessed because security settings are too limiting */
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private static Object maximizedBothOption()
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throws NoSuchFieldException
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{
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Field maxBothOptionField = null;
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try {
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maxBothOptionField = Frame.class.getField("MAXIMIZED_BOTH");
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/* Don't catch NoSuchFieldException */
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} catch (SecurityException ex) {
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/* We'll never know if we're using JDK 1.4 or later. */
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handleSecurityException(ex);
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throw new NoSuchFieldException("java.awt.Frame.MAXIMIZED_BOTH");
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}
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try {
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return maxBothOptionField.get(null);
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} catch (IllegalAccessException ex) {
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throw new ThdlLazyException(ex);
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} catch (IllegalArgumentException ex) {
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throw new ThdlLazyException(ex);
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} catch (NullPointerException ex) {
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throw new ThdlLazyException(ex);
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} catch (ExceptionInInitializerError ex) {
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throw new ThdlLazyException(ex);
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}
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}
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};
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