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/* * @(#)MethodDescriptor.java 1.32 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.beans; import java.lang.ref.Reference; import java.lang.ref.WeakReference; import java.lang.reflect.Method; import java.util.List; import java.util.ArrayList; import com.sun.beans.ObjectHandler; /** * A MethodDescriptor describes a particular method that a Java Bean * supports for external access from other components. */ public class MethodDescriptor extends FeatureDescriptor { private Reference methodRef; private String[] paramNames; private List params; private ParameterDescriptor parameterDescriptors[]; /** * Constructs a <code>MethodDescriptor</code> from a * <code>Method</code>. * * @param method The low-level method information. */ public MethodDescriptor(Method method) { this(method, null); } /** * Constructs a <code>MethodDescriptor</code> from a * <code>Method</code> providing descriptive information for each * of the method's parameters. * * @param method The low-level method information. * @param parameterDescriptors Descriptive information for each of the * method's parameters. */ public MethodDescriptor(Method method, ParameterDescriptor parameterDescriptors[]) { setName(method.getName()); setMethod(method); this.parameterDescriptors = parameterDescriptors; } /** * Gets the method that this MethodDescriptor encapsualtes. * * @return The low-level description of the method */ public synchronized Method getMethod() { Method method = getMethod0(); if (method == null) { Class cls = getClass0(); if (cls != null) { Class[] params = getParams(); if (params == null) { for (int i = 0; i < 3; i++) { // Find methods for up to 2 params. We are guessing here. // This block should never execute unless the classloader // that loaded the argument classes disappears. method = Introspector.findMethod(cls, getName(), i, null); if (method != null) { break; } } } else { method = Introspector.findMethod(cls, getName(), params.length, params); } setMethod(method); } } return method; } private synchronized void setMethod(Method method) { if (method == null) { return; } if (getClass0() == null) { setClass0(method.getDeclaringClass()); } setParams(method.getParameterTypes()); methodRef = createReference(method, true); } private Method getMethod0() { return (Method)getObject(methodRef); } private synchronized void setParams(Class[] param) { if (param == null) { return; } paramNames = new String[param.length]; params = new ArrayList(param.length); for (int i = 0; i < param.length; i++) { paramNames[i] = param[i].getName(); params.add(new WeakReference(param[i])); } } // pp getParamNames used as an optimization to avoid method.getParameterTypes. String[] getParamNames() { return paramNames; } private synchronized Class[] getParams() { Class[] clss = new Class[params.size()]; for (int i = 0; i < params.size(); i++) { Reference ref = (Reference)params.get(i); Class cls = (Class)ref.get(); if (cls == null) { return null; } else { clss[i] = cls; } } return clss; } /** * Gets the ParameterDescriptor for each of this MethodDescriptor's * method's parameters. * * @return The locale-independent names of the parameters. May return * a null array if the parameter names aren't known. */ public ParameterDescriptor[] getParameterDescriptors() { return parameterDescriptors; } /* public String toString() { String message = "name=" + getName(); Class cls = getClass0(); if (cls != null) { message += ", class="; message += cls.getName(); } String[] names = getParamNames(); if (names != null) { for (int i = 0; i < names.length; i++) { message += ", param=" + names[i]; } } return message; } */ /* * Package-private constructor * Merge two method descriptors. Where they conflict, give the * second argument (y) priority over the first argument (x). * @param x The first (lower priority) MethodDescriptor * @param y The second (higher priority) MethodDescriptor */ MethodDescriptor(MethodDescriptor x, MethodDescriptor y) { super(x,y); methodRef = x.methodRef; if (y.methodRef != null) { methodRef = y.methodRef; } params = x.params; if (y.params != null) { params = y.params; } paramNames = x.paramNames; if (y.paramNames != null) { paramNames = y.paramNames; } parameterDescriptors = x.parameterDescriptors; if (y.parameterDescriptors != null) { parameterDescriptors = y.parameterDescriptors; } } /* * Package-private dup constructor * This must isolate the new object from any changes to the old object. */ MethodDescriptor(MethodDescriptor old) { super(old); methodRef = old.methodRef; params = old.params; paramNames = old.paramNames; if (old.parameterDescriptors != null) { int len = old.parameterDescriptors.length; parameterDescriptors = new ParameterDescriptor[len]; for (int i = 0; i < len ; i++) { parameterDescriptors[i] = new ParameterDescriptor(old.parameterDescriptors[i]); } } } }