| /* |
| * 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.taglib.core; |
| |
| import javax.el.ELException; |
| import javax.el.ValueExpression; |
| import javax.faces.FacesException; |
| import javax.faces.component.StateHolder; |
| import javax.faces.context.FacesContext; |
| import javax.faces.event.AbortProcessingException; |
| import javax.faces.event.ValueChangeEvent; |
| import javax.faces.event.ValueChangeListener; |
| |
| /** |
| * This class is used in conjunction with ValueChangeListenerTag. |
| * |
| * When a tag like this is in a jsp page: |
| * |
| * <f:valueChangeListener binding="#{mybean}"/> |
| * |
| * or |
| * |
| * <f:valueChangeListener type="#{'anyid'}" binding="#{mybean}"/> |
| * |
| * The value of mybean could be already on the context, so this converter avoid creating a new variable and use the |
| * previous one. |
| * |
| * @author Leonardo Uribe (latest modification by $Author$) |
| * @version $Revision$ $Date$ |
| */ |
| public class DelegateValueChangeListener implements ValueChangeListener, StateHolder |
| { |
| |
| private ValueExpression _type; |
| private ValueExpression _binding; |
| |
| public DelegateValueChangeListener() |
| { |
| } |
| |
| public DelegateValueChangeListener(ValueExpression type, ValueExpression binding) |
| { |
| super(); |
| _type = type; |
| _binding = binding; |
| } |
| |
| @Override |
| public boolean isTransient() |
| { |
| return false; |
| } |
| |
| @Override |
| public void restoreState(FacesContext facesContext, Object state) |
| { |
| Object[] values = (Object[]) state; |
| _type = (ValueExpression) values[0]; |
| _binding = (ValueExpression) values[1]; |
| } |
| |
| @Override |
| public Object saveState(FacesContext facesContext) |
| { |
| Object[] values = new Object[2]; |
| values[0] = _type; |
| values[1] = _binding; |
| return values; |
| } |
| |
| @Override |
| public void setTransient(boolean arg0) |
| { |
| // Do nothing |
| } |
| |
| private ValueChangeListener _getDelegate() |
| { |
| return _createValueChangeListener(); |
| } |
| |
| private ValueChangeListener _createValueChangeListener() |
| { |
| FacesContext facesContext = FacesContext.getCurrentInstance(); |
| ValueChangeListener listener = null; |
| // type and/or binding must be specified |
| try |
| { |
| if (null != _binding) |
| { |
| try |
| { |
| listener = (ValueChangeListener)_binding.getValue(facesContext.getELContext()); |
| if (null != listener) |
| { |
| return listener; |
| } |
| } |
| catch (ELException e) |
| { |
| // throw new JspException("Exception while evaluating the binding attribute of Component " |
| // + component.getId(), e); |
| } |
| } |
| |
| if (null != _type) |
| { |
| // FIXME: The listener never get created, check when this class is really used. |
| /*String className; |
| if (_type.isLiteralText()) |
| { |
| className = _type.getExpressionString(); |
| } |
| else |
| { |
| className = (String) _type.getValue(facesContext.getELContext()); |
| }*/ |
| |
| listener = null; |
| // listener = (ActionListener) ClassUtils.newInstance(className); |
| if (null != _binding) |
| { |
| try |
| { |
| _binding.setValue(facesContext.getELContext(), listener); |
| } |
| catch (ELException e) |
| { |
| // throw new JspException("Exception while evaluating the binding attribute of Component " |
| // + component.getId(), e); |
| } |
| } |
| |
| return listener; |
| } |
| } |
| catch (ClassCastException e) |
| { |
| throw new FacesException(e); |
| } |
| |
| return listener; |
| } |
| |
| @Override |
| public void processValueChange(ValueChangeEvent event) throws AbortProcessingException |
| { |
| _getDelegate().processValueChange(event); |
| } |
| } |