001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.extensions.breadcrumb.panel; 018 019import java.lang.reflect.Constructor; 020 021import org.apache.wicket.extensions.breadcrumb.IBreadCrumbModel; 022import org.apache.wicket.util.lang.Args; 023 024 025/** 026 * Simple factory that creates instances of a {@link BreadCrumbPanel bread crumb panel} based on the 027 * class it is constructed with. 028 * 029 * @author Eelco Hillenius 030 */ 031public final class BreadCrumbPanelFactory implements IBreadCrumbPanelFactory 032{ 033 private static final long serialVersionUID = 1L; 034 035 /** Class to construct. */ 036 private final Class<? extends BreadCrumbPanel> panelClass; 037 038 /** 039 * Construct. 040 * 041 * @param panelClass 042 * The class to use for creating instances. Must be of type {@link BreadCrumbPanel}, 043 * and must have constructor 044 * {@link BreadCrumbPanel#BreadCrumbPanel(String, IBreadCrumbModel)} 045 */ 046 public BreadCrumbPanelFactory(final Class<? extends BreadCrumbPanel> panelClass) 047 { 048 Args.notNull(panelClass, "panelClass"); 049 050 if (!BreadCrumbPanel.class.isAssignableFrom(panelClass)) 051 { 052 throw new IllegalArgumentException("argument panelClass (" + panelClass + 053 ") must extend class " + BreadCrumbPanel.class.getName()); 054 } 055 056 057 this.panelClass = panelClass; 058 059 // check whether it has the proper constructor 060 getConstructor(); 061 } 062 063 /** 064 * @see org.apache.wicket.extensions.breadcrumb.panel.IBreadCrumbPanelFactory#create(java.lang.String, 065 * org.apache.wicket.extensions.breadcrumb.IBreadCrumbModel) 066 */ 067 @Override 068 public final BreadCrumbPanel create(final String componentId, 069 final IBreadCrumbModel breadCrumbModel) 070 { 071 Constructor<? extends BreadCrumbPanel> ctor = getConstructor(); 072 try 073 { 074 return ctor.newInstance(componentId, breadCrumbModel); 075 } 076 catch (Exception e) 077 { 078 throw new RuntimeException(e); 079 } 080 } 081 082 /** 083 * Gets the proper constructor of the panel class. 084 * 085 * @return The constructor. 086 */ 087 private Constructor<? extends BreadCrumbPanel> getConstructor() 088 { 089 try 090 { 091 return panelClass.getConstructor(String.class, IBreadCrumbModel.class); 092 } 093 catch (SecurityException e) 094 { 095 throw new RuntimeException(e); 096 } 097 catch (NoSuchMethodException e) 098 { 099 throw new RuntimeException(e); 100 } 101 } 102}