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-/* 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;
-
-/**
- * <p>
- * 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.
- * </p>
- * <p>
- * As an example, consider the following interface:
- * </p>
- * <pre>
- * public interface Person
- * {
- * public String getName();
- * public Date getBirthday();
- * }
- * </pre>
- * <p>
- * 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.
- * </p>
- * <p>
- * 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.
- * </p>
- * <p>
- * 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.
- * </p>
- *
- * @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);
- }
-
-}