Michael Bayne
09f0bee0f3
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4602 542714f4-19e9-0310-aa3c-eee0fc999fb1
119 lines
3.9 KiB
Java
119 lines
3.9 KiB
Java
//
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// $Id$
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/narya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.presents.util;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import com.samskivert.util.MethodFinder;
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import com.samskivert.util.StringUtil;
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import com.threerings.presents.Log;
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/**
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* Class related utility functions.
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*/
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public class ClassUtil
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{
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/**
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* Locates and returns the first method in the supplied class whose
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* name is equal to the specified name. If a method is located, it
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* will be cached in the supplied cache so that subsequent requests
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* will immediately return the method from the cache rather than
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* re-reflecting.
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*
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* @return the method with the specified name or null if no method
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* with that name could be found.
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*/
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public static Method getMethod (
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String name, Object target, HashMap<String,Method> cache)
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{
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Class tclass = target.getClass();
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String key = tclass.getName() + ":" + name;
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Method method = (Method)cache.get(key);
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if (method == null) {
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method = findMethod(tclass, name);
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if (method != null) {
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cache.put(key, method);
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}
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}
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return method;
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}
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/**
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* Looks up the method on the specified object that has a signature
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* that matches the supplied arguments array. This is very expensive,
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* so you shouldn't be doing this for something that happens
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* frequently.
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*
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* @return the best matching method with the specified name that
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* accepts the supplied arguments, or null if no method could be
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* found.
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*
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* @see MethodFinder
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*/
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public static Method getMethod (String name, Object target, Object[] args)
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{
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Class tclass = target.getClass();
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Method meth = null;
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try {
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MethodFinder finder = new MethodFinder(tclass);
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meth = finder.findMethod(name, args);
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} catch (NoSuchMethodException nsme) {
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// nothing to do here but fall through and return null
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Log.info("No such method [name=" + name +
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", tclass=" + tclass.getName() +
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", args=" + StringUtil.toString(args) +
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", error=" + nsme + "].");
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} catch (SecurityException se) {
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Log.warning("Unable to look up method? " +
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"[tclass=" + tclass.getName() +
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", mname=" + name + "].");
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}
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return meth;
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}
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/**
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* Locates and returns the first method in the supplied class whose
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* name is equal to the specified name.
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*
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* @return the method with the specified name or null if no method
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* with that name could be found.
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*/
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public static Method findMethod (Class clazz, String name)
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{
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Method[] methods = clazz.getMethods();
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for (int i = 0; i < methods.length; i++) {
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if (methods[i].getName().equals(name)) {
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return methods[i];
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}
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}
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return null;
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}
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}
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