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Commons DBCP example source code file (ConstructorUtil.java)
The Commons DBCP ConstructorUtil.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.jocl; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; /** * Miscellaneous {@link Constructor} related utility functions. * * @author Rodney Waldhoff * @version $Revision: 479137 $ $Date: 2006-11-25 10:51:48 -0500 (Sat, 25 Nov 2006) $ */ public class ConstructorUtil { /** * Returns a {@link Constructor} for the given method signature, or <tt>null * if no such <tt>Constructor can be found. * * @param type the (non-<tt>null) type of {@link Object} the returned {@link Constructor} should create * @param argTypes a non-<tt>null array of types describing the parameters to the {@link Constructor}. * @return a {@link Constructor} for the given method signature, or <tt>null * if no such <tt>Constructor can be found. * @see #invokeConstructor */ public static Constructor getConstructor(Class type, Class[] argTypes) { if(null == type || null == argTypes) { throw new NullPointerException(); } Constructor ctor = null; try { ctor = type.getConstructor(argTypes); } catch(Exception e) { ctor = null; } if(null == ctor) { // no directly declared matching constructor, // look for something that will work // XXX this should really be more careful to // adhere to the jls mechanism for late binding Constructor[] ctors = type.getConstructors(); for(int i=0;i<ctors.length;i++) { Class[] paramtypes = ctors[i].getParameterTypes(); if(paramtypes.length == argTypes.length) { boolean canuse = true; for(int j=0;j<paramtypes.length;j++) { if(paramtypes[j].isAssignableFrom(argTypes[j])) { continue; } else { canuse = false; break; } } if(canuse == true) { ctor = ctors[i]; break; } } } } return ctor; } /** * Creates a new instance of the specified <tt>type * using a {@link Constructor} described by the given parameter types * and values. * * @param type the type of {@link Object} to be created * @param argTypes a non-<tt>null array of types describing the parameters to the {@link Constructor}. * @param argValues a non-<tt>null array containing the values of the parameters to the {@link Constructor}. * @return a new instance of the specified <tt>type * using a {@link Constructor} described by the given parameter types * and values. * @exception InstantiationException * @exception IllegalAccessException * @exception InvocationTargetException */ public static Object invokeConstructor(Class type, Class[] argTypes, Object[] argValues) throws InstantiationException, IllegalAccessException, InvocationTargetException { return ConstructorUtil.getConstructor(type,argTypes).newInstance(argValues); } } Other Commons DBCP examples (source code examples)Here is a short list of links related to this Commons DBCP ConstructorUtil.java source code file: |
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