2009/05/20 - Apache Shale has been retired.

 /*

  * 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.shale.test.el;

 import javax.el.ELContext;

 import javax.el.PropertyNotWritableException;

 import javax.el.ValueExpression;

 import javax.faces.context.FacesContext;

 /**

  * <p>Mock implementation of <code>ValueExpression</code> that wraps a variable.</p>

  */

 public class MockVariableValueExpression extends ValueExpression {

     // ------------------------------------------------------------ Constructors

     /**

      * Serial version UID.

      */

     private static final long serialVersionUID = 4475919948345298291L;

     /**

      * <p>Construct a new expression for the specified instance.</p>

      *

      * @param instance Variable instance to be wrapped

      * @param expectedType Expected type of the result

      */

     public MockVariableValueExpression(Object instance, Class expectedType) {

         if (instance == null) {

             throw new NullPointerException("Instance cannot be null");

         }

         this.instance = instance;

         this.expectedType = expectedType;

     }

     // ------------------------------------------------------ Instance Variables

     /**

      * <p>The expected result type for <code>getValue()</code> calls.</p>

      */

     private Class expectedType = null;

     /**

      * <p>The variable instance being wrapped by this expression.</p>

      */

     private Object instance = null;

     // ------------------------------------------------------ Expression Methods

     /**

      * <p>Return <code>true</code> if this expression is equal to the

      * specified expression.</p>

      *

      * @param obj Object to be compared

      */

     public boolean equals(Object obj) {

         if ((obj != null) & (obj instanceof ValueExpression)) {

             return instance.toString().equals(((ValueExpression) obj).getExpressionString());

         } else {

             return false;

         }

     }

     /**

      * <p>Return the original String used to create this expression,

      * unmodified.</p>

      */

     public String getExpressionString() {

         return this.instance.toString();

     }

     /**

      * <p>Return the hash code for this expression.</p>

      */

     public int hashCode() {

         return this.instance.toString().hashCode();

     }

     /**

      * <p>Return <code>true</code> if the expression string for this expression

      * contains only literal text.</p>

      */

     public boolean isLiteralText() {

         return true;

     }

     // ------------------------------------------------- ValueExpression Methods

     /**

      * <p>Return the type that the result of this expression will

      * be coerced to.</p>

      */

     public Class getExpectedType() {

         return this.expectedType;

     }

     /**

      * <p>Evaluate this expression relative to the specified context,

      * and return the most general type that is acceptable for the

      * value passed in a <code>setValue()</code> call.</p>

      *

      * @param context ELContext for this evaluation

      */

     public Class getType(ELContext context) {

         if (context == null) {

             throw new NullPointerException();

         }

         return this.instance.getClass();

     }

     /**

      * <p>Evaluate this expression relative to the specified context,

      * and return the result.</p>

      *

      * @param context ELContext for this evaluation

      */

     public Object getValue(ELContext context) {

         if (context == null) {

             throw new NullPointerException();

         }

         FacesContext fcontext = (FacesContext) context.getContext(FacesContext.class);

         return fcontext.getApplication().getExpressionFactory().coerceToType(instance, expectedType);

     }

     /**

      * <p>Evaluate this expression relative to the specified context,

      * and return <code>true</code> if a call to <code>setValue()</code>

      * will always fail.</p>

      *

      * @param context ELContext for this evaluation

      */

     public boolean isReadOnly(ELContext context) {

         if (context == null) {

             throw new NullPointerException();

         }

         return true;

     }

     /**

      * <p>Evaluate this expression relative to the specified context,

      * and set the result to the specified value.</p>

      *

      * @param context ELContext for this evaluation

      * @param value Value to which the result should be set

      */

     public void setValue(ELContext context, Object value) {

         if (context == null) {

             throw new NullPointerException();

         }

         throw new PropertyNotWritableException();

     }

 }