001 package org.apache.myfaces.tobago.event; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one or more 005 * contributor license agreements. See the NOTICE file distributed with 006 * this work for additional information regarding copyright ownership. 007 * The ASF licenses this file to You under the Apache License, Version 2.0 008 * (the "License"); you may not use this file except in compliance with 009 * the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, software 014 * distributed under the License is distributed on an "AS IS" BASIS, 015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 016 * See the License for the specific language governing permissions and 017 * limitations under the License. 018 */ 019 020 import org.apache.commons.logging.Log; 021 import org.apache.commons.logging.LogFactory; 022 023 import javax.faces.component.StateHolder; 024 import javax.faces.component.UIComponentBase; 025 import javax.faces.context.FacesContext; 026 import javax.faces.el.ValueBinding; 027 028 /* 029 * Date: Jan 9, 2007 030 * Time: 8:08:01 PM 031 */ 032 public class TabChangeListenerValueBindingDelegate implements TabChangeListener, StateHolder { 033 private static final Log LOG = LogFactory.getLog(TabChangeListenerValueBindingDelegate.class); 034 private String type; 035 private ValueBinding valueBinding; 036 037 public TabChangeListenerValueBindingDelegate() { 038 } 039 040 public TabChangeListenerValueBindingDelegate(String type, ValueBinding valueBinding) { 041 this.type = type; 042 this.valueBinding = valueBinding; 043 } 044 045 public void processTabChange(TabChangeEvent tabChangeEvent) { 046 TabChangeListener handler = getTabChangeListener(); 047 if (handler != null) { 048 handler.processTabChange(tabChangeEvent); 049 } else { 050 LOG.error("Ignoring TabChangeEvent. No TabChangeListener found."); 051 } 052 } 053 054 public Object saveState(FacesContext context) { 055 Object[] state = new Object[2]; 056 state[0] = UIComponentBase.saveAttachedState(context, valueBinding); 057 state[1] = type; 058 return state; 059 } 060 061 public void restoreState(FacesContext context, Object state) { 062 Object[] values = (Object[]) state; 063 valueBinding = (ValueBinding) UIComponentBase.restoreAttachedState(context, values[0]); 064 type = (String) values[1]; 065 066 } 067 068 public boolean isTransient() { 069 return false; 070 } 071 072 public void setTransient(boolean newTransientValue) { 073 // ignore 074 } 075 076 private TabChangeListener getTabChangeListener() { 077 TabChangeListener handler = null; 078 if (valueBinding != null) { 079 Object obj = valueBinding.getValue(FacesContext.getCurrentInstance()); 080 if (obj != null && obj instanceof TabChangeListener) { 081 handler = (TabChangeListener) obj; 082 } 083 } 084 if (handler == null && type != null) { 085 handler = createTabChangeListener(type); 086 if (handler != null && valueBinding != null) { 087 valueBinding.setValue(FacesContext.getCurrentInstance(), handler); 088 } 089 } 090 return handler; 091 } 092 093 private TabChangeListener createTabChangeListener(String className) { 094 try { 095 Class clazz = getClass().getClassLoader().loadClass(className); 096 return ((TabChangeListener) clazz.newInstance()); 097 } catch (Exception e) { 098 LOG.error("", e); 099 } 100 return null; 101 } 102 103 }