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The source code/* * Copyright 1999-2004 The Apache Software Foundation * * Licensed 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.jxpath.functions; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; import org.apache.commons.jxpath.ExpressionContext; import org.apache.commons.jxpath.Function; import org.apache.commons.jxpath.JXPathException; import org.apache.commons.jxpath.util.TypeUtils; /** * An extension function that creates an instance using a constructor. * * @author Dmitri Plotnikov * @version $Revision: 1.11 $ $Date: 2004/02/29 14:17:44 $ */ public class ConstructorFunction implements Function { private Constructor constructor; private static final Object EMPTY_ARRAY[] = new Object[0]; public ConstructorFunction(Constructor constructor) { this.constructor = constructor; } /** * Converts parameters to suitable types and invokes the constructor. */ public Object invoke(ExpressionContext context, Object[] parameters) { try { Object[] args; if (parameters == null) { parameters = EMPTY_ARRAY; } int pi = 0; Class types[] = constructor.getParameterTypes(); if (types.length > 0 && ExpressionContext.class.isAssignableFrom(types[0])) { pi = 1; } args = new Object[parameters.length + pi]; if (pi == 1) { args[0] = context; } for (int i = 0; i < parameters.length; i++) { args[i + pi] = TypeUtils.convert(parameters[i], types[i + pi]); } return constructor.newInstance(args); } catch (Throwable ex) { if (ex instanceof InvocationTargetException) { ex = ((InvocationTargetException) ex).getTargetException(); } throw new JXPathException( "Cannot invoke constructor " + constructor, ex); } } } |
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