From e1bea0c0687c5f4551b3a6058ec37ce3705fa6cc Mon Sep 17 00:00:00 2001 From: Matthias Klose Date: Sun, 3 Jun 2007 23:18:43 +0000 Subject: libjava/classpath/ChangeLog.gcj: 2007-05-31 Matthias Klose * javax/management/NotificationBroadcasterSupport.java (getNotificationInfo): Add cast. * native/jni/qt-peer/Makefile.am (AM_CXXFLAGS): Add libstdc++ include directories. * native/jni/qt-peer/Makefile.in: Regenerate. libjava/ChangeLog: 2007-06-03 Matthias Klose * java/io/natFileWin32.cc (setFilePermissions): New (stub only). _access: Handle EXEC query, stub only. 2007-06-03 Matthias Klose Merged from classpath: * gnu/java/nio/SelectorProviderImpl.java: Whitespace merge. * java/lang/System.java(inheritedChannel): New. * java/lang/Character.java: Remove stray`;'. * java/net/MulticastSocket.java: Merged. * java/text/DateFormatSymbols.java(getInstance): New, comment updates. * java/text/Collator.java(getInstance): Merged. * java/util/Calendar.java: New attributes ALL_STYLES, SHORT, LONG. getDisplayName, getDisplayNames: New. * java/util/logging/Logger.java: Merged. * Regenerate .class and .h files. 2007-06-03 Matthias Klose * java/io/File.java: Merge with classpath-0.95, new method setFilePermissions, new attribute EXEC. * java/io/natFilePosix.cc (setFilePermissions): New. _access: Handle EXEC query. * classpath/lib/java/io/File.class, java/io/File.h: Regenerate. 2007-06-03 Matthias Klose Imported GNU Classpath 0.95. * classpath/Makefile.in, classpath/native/jni/midi-dssi/Makefile.in, classpath/native/jni/classpath/Makefile.in, classpath/native/jni/Makefile.in, classpath/native/jni/gconf-peer/Makefile.in, classpath/native/jni/java-io/Makefile.in, classpath/native/jni/native-lib/Makefile.in, classpath/native/jni/java-util/Makefile.in, classpath/native/jni/midi-alsa/Makefile.in, classpath/native/jni/java-lang/Makefile.in, classpath/native/jni/java-nio/Makefile.in, classpath/native/jni/java-net/Makefile.in, classpath/native/jni/xmlj/Makefile.in, classpath/native/jni/qt-peer/Makefile.in, classpath/native/jni/gtk-peer/Makefile.in, classpath/native/Makefile.in, classpath/native/jawt/Makefile.in, classpath/native/fdlibm/Makefile.in, classpath/native/plugin/Makefile.in, classpath/resource/Makefile.in, classpath/scripts/Makefile.in, classpath/tools/Makefile.in, classpath/doc/Makefile.in, classpath/doc/api/Makefile.in, classpath/lib/Makefile.in, classpath/external/Makefile.in, classpath/external/jsr166/Makefile.in, classpath/external/sax/Makefile.in, classpath/external/w3c_dom/Makefile.in, classpath/external/relaxngDatatype/Makefile.in, classpath/include/Makefile.in, classpath/examples/Makefile.in: Regenerate. * classpath/config.guess, classpath/config.sub, classpath/ltmain.sh : Update. * classpath/configure, classpath/depcomp, classpath/missing, classpath/aclocal.m4, classpath/install-sh: Regenerate. * gnu/classpath/Configuration.java (CLASSPATH_VERSION): Now 0.95. * sources.am: Regenerate. * Makefile.in: Regenerate. * Update the .class files and generated CNI header files, add new .class and generated CNI header files. * Remove generated files for removed java source files: classpath/gnu/java/net/BASE64.java, classpath/gnu/java/security/util/Base64.java, classpath/gnu/java/awt/peer/gtk/GThreadMutex.java, classpath/gnu/java/awt/peer/gtk/GThreadNativeMethodRunner.java, classpath/gnu/java/awt/font/autofit/Scaler.java, classpath/gnu/classpath/jdwp/util/Value.java, classpath/gnu/javax/net/ssl/Base64.java. * Remove empty directories. * Makefile.am(nat_source_files): Add natVMOperatingSystemMXBeanImpl.cc. * java/lang/Class.java(setAccessible): Merge from classpath. * java/util/Locale.java: Remove. * gnu/java/lang/management/VMOperatingSystemMXBeanImpl.java, gnu/java/lang/management/natVMOperatingSystemMXBeanImpl.cc: New. * gcj/javaprims.h: Update class declarations. * scripts/classes.pl: Update usage. * HACKING: Mention to build all peers. From-SVN: r125302 --- .../openmbean/CompositeDataInvocationHandler.java | 190 +++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 libjava/classpath/javax/management/openmbean/CompositeDataInvocationHandler.java (limited to 'libjava/classpath/javax/management/openmbean/CompositeDataInvocationHandler.java') diff --git a/libjava/classpath/javax/management/openmbean/CompositeDataInvocationHandler.java b/libjava/classpath/javax/management/openmbean/CompositeDataInvocationHandler.java new file mode 100644 index 0000000..170ec32 --- /dev/null +++ b/libjava/classpath/javax/management/openmbean/CompositeDataInvocationHandler.java @@ -0,0 +1,190 @@ +/* CompositeDataInvocationHandler.java - Pseudo-accessors for CompositeData. + Copyright (C) 2007 Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package javax.management.openmbean; + +import java.lang.reflect.InvocationHandler; +import java.lang.reflect.Method; +import java.lang.reflect.Proxy; + +/** + *

+ * Provides an {@link java.lang.reflect.InvocationHandler} which + * implements a series of accessor methods (those beginning with + * {@code "get"} or {@code "is"}) using the content of a + * {@link CompositeData} object. An instance of {@link CompositeData} + * consists of a series of key-value mappings. This handler assumes + * these keys to be the names of attributes, and thus provides + * accessor methods by returning the associated value. + *

+ *

+ * As an example, consider the following interface: + *

+ * 
+ * public interface Person
+ * {
+ *   public String getName();
+ *   public Date getBirthday();
+ * }
+ *
+ *

+ * This specifies two accessor methods for retrieving the attributes, + * {@code name} and {@code birthday}. An implementation of this interface + * can be provided by creating an instance of this class, using a + * {@link CompositeData} object with appropriate key-value mappings + * (e.g. "name" => "Fred", "birthday" => 30/06/1974), and then passing + * that to {@link java.lang.reflect.Proxy#newProxyInstance} along with + * the interface itself. The invocation handler implements the methods + * by calling {@link CompositeData#get(String)} with the appropriate key. + *

+ *

+ * The attribute name is derived by taking the remainder of the method + * name following {@code "get"}. If the first letter of this substring + * is uppercase, then two attempts are made to retrieve the attribute + * from the {@link CompositeData} instance: one using the original substring, + * and one with the first letter changed to its lower-case equivalent. + * If the first letter is lowercase, only the exact substring is used. + *

+ *

+ * An {@link Object#equals(Object)} implementation is provided. This returns + * true if the argument is a proxy with a {@link CompositeDataInvocationHandler} + * using an equivalent {@link CompositeData} instance. {@link Object#hashCode()} + * is also defined so as to match this implementation and give equivalent instances + * the same hashcode. + *

+ * + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.6 + */ +public class CompositeDataInvocationHandler + implements InvocationHandler +{ + + /** + * The {@link CompositeData} providing the key-value mappings. + */ + private CompositeData data; + + /** + * Constructs a new {@link CompositeDataInvocationHandler} + * with the specified {@link CompositeData} instance. + * + * @param data the {@link CompositeData} instance to use. + * @throws IllegalArgumentException if {@code data} is {@code null}. + */ + public CompositeDataInvocationHandler(CompositeData data) + { + if (data == null) + throw new IllegalArgumentException("The CompositeData instance " + + "must be non-null."); + this.data = data; + } + + /** + * Returns the {@link CompositeData} instance which provides + * the key-value mappings for this instance. This is never + * {@code null}. + * + * @return the {@link CompositeData} instance. + */ + public CompositeData getCompositeData() + { + return data; + } + + /** + * Called by the proxy class whenever a method is called. The + * handler only deals with accessor methods (beginning with + * {@code "get"} or {@code "is"}), {@code equals}, and + * {@code "hashCode"}. Accessor methods are implemented by + * returning the appropriate value from the {@link CompositeData} + * instance, while {@code equals} and {@code hashCode} allow + * two proxies with a {@link CompositeDataInvocationHandler} using + * the same {@link CompositeData} instance to be classified + * as equivalent. + * + * @param proxy the proxy on which the method was called. + * @param method the method which was called. + * @param args the arguments supplied to the method. + * @return the return value from the method. + * @throws Throwable if an exception is thrown in the process. + */ + public Object invoke(Object proxy, Method method, Object[] args) + throws Throwable + { + String mName = method.getName(); + if (mName.equals("equals")) + { + if (args[0] instanceof Proxy) + { + InvocationHandler h = Proxy.getInvocationHandler(args[0]); + if (h instanceof CompositeDataInvocationHandler) + return data.equals(((CompositeDataInvocationHandler) + h).getCompositeData()); + } + return false; + } + if (mName.equals("hashCode")) + { + return data.hashCode(); + } + String attrib = null; + if (mName.startsWith("get")) + attrib = mName.substring(3); + else if (mName.startsWith("is")) + attrib = mName.substring(2); + if (attrib == null) + throw new NoSuchMethodException(mName + " is not an accessor."); + if (!data.containsKey(attrib)) + { + if (Character.isLowerCase(attrib.charAt(0))) + throw new NoSuchMethodException("The attribute " + + attrib + " is not available " + + "in the given CompositeData " + + "object"); + attrib = Character.toLowerCase(attrib.charAt(0)) + + attrib.substring(1); + if (!data.containsKey(attrib)) + throw new NoSuchMethodException("The attribute " + + attrib + " is not available " + + "in the given CompositeData " + + "object"); + } + return data.get(attrib); + } + +} -- cgit v1.1