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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ClassFabUtils.java | 92.9% | 97.1% | 87.5% | 94.6% |
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// Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.hivemind.service;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.lang.reflect.Proxy;
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/**
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* Static class containing utility methods.
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*
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* @author Howard Lewis Ship
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*/
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public class ClassFabUtils |
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{ |
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private static long _uid = System.currentTimeMillis(); |
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private static final char QUOTE = '"'; |
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private ClassFabUtils()
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{ |
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} |
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/**
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* Generates a unique class name, which will be in the default package.
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*/
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public static synchronized String generateClassName(String baseName) |
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{ |
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return "$" + baseName + "_" + Long.toHexString(_uid++); |
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} |
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/**
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* Returns a class name derived from the provided interfaceClass. The package part of the
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* interface name is stripped out, and the result passed to {@link #generateClassName(String)}.
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*
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* @since 1.1
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*/
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public static synchronized String generateClassName(Class interfaceClass) |
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{ |
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String name = interfaceClass.getName(); |
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int dotx = name.lastIndexOf('.');
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return generateClassName(name.substring(dotx + 1));
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} |
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/**
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* Javassist needs the class name to be as it appears in source code, even for arrays. Invoking
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* getName() on a Class instance representing an array returns the internal format (i.e, "[...;"
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* or something). This returns it as it would appear in Java code.
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*/
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public static String getJavaClassName(Class inputClass) |
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{ |
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if (inputClass.isArray())
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return getJavaClassName(inputClass.getComponentType()) + "[]"; |
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return inputClass.getName();
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} |
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/**
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* Returns true if the method is the standard toString() method. Very few interfaces will ever
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* include this method as part of the interface, but we have to be sure.
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*/
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public static boolean isToString(Method method) |
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{ |
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if (!method.getName().equals("toString")) |
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return false; |
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if (method.getParameterTypes().length > 0)
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return false; |
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return method.getReturnType().equals(String.class); |
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} |
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/**
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* Adds a <code>toString()</code> method to a class that returns a fixed, pre-computed value.
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*
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* @param classFab
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* ClassFab used to construct the new class.
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* @param toStringResult
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* fixed result to be returned by the method.
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*/
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public static void addToStringMethod(ClassFab classFab, String toStringResult) |
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{ |
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StringBuffer buffer = new StringBuffer("return "); |
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buffer.append(QUOTE); |
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buffer.append(toStringResult); |
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buffer.append(QUOTE); |
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buffer.append(";");
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classFab.addMethod(Modifier.PUBLIC, new MethodSignature(String.class, "toString", null, |
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null), buffer.toString());
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} |
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/**
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* Returns the class of an instance. However, if the instance is, in fact, a JDK proxy, returns
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* the interfaceClass (because JDK proxies do not work with Javassist).
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*
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* @param instance
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* the object instance to obtain a class from
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* @param interfaceClass
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* the interface class to return if the instance is a JDK proxy.
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*/
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public static Class getInstanceClass(Object instance, Class interfaceClass) |
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{ |
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Class instanceClass = instance.getClass(); |
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if (Proxy.isProxyClass(instanceClass))
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return interfaceClass;
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return instanceClass;
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} |
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/**
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* Adds a method that does nothing. If the method returns a value, it will return null, 0 or
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* false (depending on the type).
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*
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* @since 1.1
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*/
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public static void addNoOpMethod(ClassFab cf, MethodSignature m) |
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{ |
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StringBuffer body = new StringBuffer("{ "); |
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Class returnType = m.getReturnType(); |
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if (returnType != void.class) |
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{ |
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body.append("return");
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if (returnType.isPrimitive())
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{ |
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if (returnType == boolean.class) |
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body.append(" false");
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else
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body.append(" 0");
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} |
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else
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{ |
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body.append(" null");
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} |
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body.append(";");
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} |
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body.append(" }");
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cf.addMethod(Modifier.PUBLIC, m, body.toString()); |
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} |
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} |
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