author | serb |
Sat, 18 Jul 2015 15:09:28 +0300 | |
changeset 32109 | b89c59200379 |
parent 25859 | 3317bb8137f4 |
child 35667 | ed476aba94de |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.beans; |
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import java.lang.ref.Reference; |
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import java.lang.ref.WeakReference; |
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import java.lang.reflect.Method; |
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import java.util.List; |
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import java.util.ArrayList; |
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/** |
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* A MethodDescriptor describes a particular method that a Java Bean |
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* supports for external access from other components. |
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* |
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* @since 1.1 |
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*/ |
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public class MethodDescriptor extends FeatureDescriptor { |
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private final MethodRef methodRef = new MethodRef(); |
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private String[] paramNames; |
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private List<WeakReference<Class<?>>> params; |
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private ParameterDescriptor parameterDescriptors[]; |
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/** |
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* Constructs a <code>MethodDescriptor</code> from a |
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* <code>Method</code>. |
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* |
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* @param method The low-level method information. |
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*/ |
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public MethodDescriptor(Method method) { |
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this(method, null); |
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} |
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/** |
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* Constructs a <code>MethodDescriptor</code> from a |
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* <code>Method</code> providing descriptive information for each |
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* of the method's parameters. |
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* |
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* @param method The low-level method information. |
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* @param parameterDescriptors Descriptive information for each of the |
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* method's parameters. |
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*/ |
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public MethodDescriptor(Method method, |
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ParameterDescriptor parameterDescriptors[]) { |
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setName(method.getName()); |
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setMethod(method); |
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this.parameterDescriptors = (parameterDescriptors != null) |
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? parameterDescriptors.clone() |
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: null; |
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} |
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/** |
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* Gets the method that this MethodDescriptor encapsulates. |
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* |
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* @return The low-level description of the method |
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*/ |
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public synchronized Method getMethod() { |
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Method method = this.methodRef.get(); |
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if (method == null) { |
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Class<?> cls = getClass0(); |
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String name = getName(); |
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if ((cls != null) && (name != null)) { |
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Class<?>[] params = getParams(); |
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if (params == null) { |
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for (int i = 0; i < 3; i++) { |
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// Find methods for up to 2 params. We are guessing here. |
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// This block should never execute unless the classloader |
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// that loaded the argument classes disappears. |
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method = Introspector.findMethod(cls, name, i, null); |
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if (method != null) { |
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break; |
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} |
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} |
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} else { |
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method = Introspector.findMethod(cls, name, params.length, params); |
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} |
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setMethod(method); |
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} |
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} |
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return method; |
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} |
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private synchronized void setMethod(Method method) { |
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if (method == null) { |
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return; |
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} |
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if (getClass0() == null) { |
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setClass0(method.getDeclaringClass()); |
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} |
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setParams(getParameterTypes(getClass0(), method)); |
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this.methodRef.set(method); |
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} |
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private synchronized void setParams(Class<?>[] param) { |
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if (param == null) { |
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return; |
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} |
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paramNames = new String[param.length]; |
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params = new ArrayList<>(param.length); |
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for (int i = 0; i < param.length; i++) { |
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paramNames[i] = param[i].getName(); |
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params.add(new WeakReference<Class<?>>(param[i])); |
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} |
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} |
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// pp getParamNames used as an optimization to avoid method.getParameterTypes. |
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String[] getParamNames() { |
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return paramNames; |
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} |
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private synchronized Class<?>[] getParams() { |
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Class<?>[] clss = new Class<?>[params.size()]; |
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for (int i = 0; i < params.size(); i++) { |
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Reference<? extends Class<?>> ref = (Reference<? extends Class<?>>)params.get(i); |
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Class<?> cls = ref.get(); |
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if (cls == null) { |
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return null; |
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} else { |
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clss[i] = cls; |
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} |
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} |
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return clss; |
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} |
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/** |
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* Gets the ParameterDescriptor for each of this MethodDescriptor's |
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* method's parameters. |
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* |
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* @return The locale-independent names of the parameters. May return |
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* a null array if the parameter names aren't known. |
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*/ |
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public ParameterDescriptor[] getParameterDescriptors() { |
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return (this.parameterDescriptors != null) |
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? this.parameterDescriptors.clone() |
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: null; |
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} |
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private static Method resolve(Method oldMethod, Method newMethod) { |
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if (oldMethod == null) { |
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return newMethod; |
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} |
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if (newMethod == null) { |
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return oldMethod; |
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} |
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return !oldMethod.isSynthetic() && newMethod.isSynthetic() ? oldMethod : newMethod; |
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} |
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/* |
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* Package-private constructor |
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* Merge two method descriptors. Where they conflict, give the |
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* second argument (y) priority over the first argument (x). |
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* @param x The first (lower priority) MethodDescriptor |
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* @param y The second (higher priority) MethodDescriptor |
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*/ |
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MethodDescriptor(MethodDescriptor x, MethodDescriptor y) { |
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super(x, y); |
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this.methodRef.set(resolve(x.methodRef.get(), y.methodRef.get())); |
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params = x.params; |
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if (y.params != null) { |
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params = y.params; |
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} |
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paramNames = x.paramNames; |
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if (y.paramNames != null) { |
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paramNames = y.paramNames; |
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} |
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parameterDescriptors = x.parameterDescriptors; |
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if (y.parameterDescriptors != null) { |
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parameterDescriptors = y.parameterDescriptors; |
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} |
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} |
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/* |
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* Package-private dup constructor |
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* This must isolate the new object from any changes to the old object. |
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*/ |
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MethodDescriptor(MethodDescriptor old) { |
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super(old); |
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this.methodRef.set(old.getMethod()); |
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params = old.params; |
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paramNames = old.paramNames; |
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if (old.parameterDescriptors != null) { |
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int len = old.parameterDescriptors.length; |
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parameterDescriptors = new ParameterDescriptor[len]; |
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for (int i = 0; i < len ; i++) { |
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parameterDescriptors[i] = new ParameterDescriptor(old.parameterDescriptors[i]); |
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} |
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} |
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} |
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void appendTo(StringBuilder sb) { |
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appendTo(sb, "method", this.methodRef.get()); |
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if (this.parameterDescriptors != null) { |
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sb.append("; parameterDescriptors={"); |
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for (ParameterDescriptor pd : this.parameterDescriptors) { |
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sb.append(pd).append(", "); |
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} |
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sb.setLength(sb.length() - 2); |
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sb.append("}"); |
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} |
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} |
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} |