/*
    * 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.trinidad.component;
  
  import javax.el.ELContext;
  import javax.el.MethodExpression;
  import javax.el.MethodInfo;
  
  import org.apache.myfaces.trinidad.event.AttributeChangeEvent;
  import org.apache.myfaces.trinidad.event.AttributeChangeListener;
  
  /**
   * Utility class for testing out AttributeChange events.
   */
  public class AttributeChangeTester extends MethodExpression
   implements AttributeChangeListener
  {
    public AttributeChangeTester()
    {
    }
  
    public void processAttributeChange(AttributeChangeEvent event)
    {
      if (_methodBindingCalled)
        throw new IllegalStateException("Method binding called before listener");
      _listenerCalled = true;
    }
  
    public MethodInfo getMethodInfo(ELContext context)
    {
      return null;
    }
  
    @Override
    public Object invoke(ELContext context, Object params[])
    {
      if (params.length != 1)
        throw new IllegalStateException("Params not of length 1");
      if (params[0] == null)
        throw new IllegalStateException("Event is null");
      if (!(params[0] instanceof AttributeChangeEvent))
        throw new IllegalStateException("Event isn't an AttributeChangeEvent");
  
      _methodBindingCalled = true;
      return null;
    }
  
    public String getExpressionString()
    {
      return null;
    }
  
    public boolean isLiteralText()
    {
      return false;
    }
  
    public int hashCode()
    {
      return 0;
    }
  
    public boolean equals(Object o)
    {
      return o == this;
    }
  
    public void verify()
    {
      if (!_methodBindingCalled)
        throw new IllegalStateException("Method binding never called");
  
      if (!_listenerCalled)
        throw new IllegalStateException("Listener never called");
    }
  
    private boolean _methodBindingCalled;
    private boolean _listenerCalled;
  }