/*
* 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.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>
*
* @since 1.0.0
*/
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();
}
}