| /* |
| * 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.myfaces.tobago.event; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.el.ValueExpression; |
| import javax.faces.component.StateHolder; |
| import javax.faces.component.UIComponentBase; |
| import javax.faces.context.FacesContext; |
| |
| public class ValueExpressionTabChangeListener implements TabChangeListener, StateHolder { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ValueExpressionTabChangeListener.class); |
| |
| private String type; |
| private ValueExpression valueExpression; |
| |
| public ValueExpressionTabChangeListener() { |
| } |
| |
| public ValueExpressionTabChangeListener(final String type, final ValueExpression valueExpression) { |
| this.type = type; |
| this.valueExpression = valueExpression; |
| } |
| |
| @Override |
| public void processTabChange(final TabChangeEvent tabChangeEvent) { |
| final TabChangeListener handler = getTabChangeListener(); |
| if (handler != null) { |
| handler.processTabChange(tabChangeEvent); |
| } else { |
| LOG.error("Ignoring TabChangeEvent. No TabChangeListener found."); |
| } |
| } |
| |
| @Override |
| public Object saveState(final FacesContext context) { |
| final Object[] state = new Object[2]; |
| state[0] = UIComponentBase.saveAttachedState(context, valueExpression); |
| state[1] = type; |
| return state; |
| } |
| |
| @Override |
| public void restoreState(final FacesContext context, final Object state) { |
| final Object[] values = (Object[]) state; |
| valueExpression = (ValueExpression) UIComponentBase.restoreAttachedState(context, values[0]); |
| type = (String) values[1]; |
| |
| } |
| |
| @Override |
| public boolean isTransient() { |
| return false; |
| } |
| |
| @Override |
| public void setTransient(final boolean newTransientValue) { |
| // ignore |
| } |
| |
| private TabChangeListener getTabChangeListener() { |
| TabChangeListener handler = null; |
| if (valueExpression != null) { |
| final Object obj = valueExpression.getValue(FacesContext.getCurrentInstance().getELContext()); |
| if (obj != null && obj instanceof TabChangeListener) { |
| handler = (TabChangeListener) obj; |
| } |
| } |
| if (handler == null && type != null) { |
| handler = createTabChangeListener(type); |
| if (handler != null && valueExpression != null) { |
| valueExpression.setValue(FacesContext.getCurrentInstance().getELContext(), handler); |
| } |
| } |
| return handler; |
| } |
| |
| private TabChangeListener createTabChangeListener(final String className) { |
| try { |
| final Class clazz = getClass().getClassLoader().loadClass(className); |
| return (TabChangeListener) clazz.newInstance(); |
| } catch (final Exception e) { |
| LOG.error("", e); |
| } |
| return null; |
| } |
| } |