MockVariableMapper.java

/*
 * 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 java.util.HashMap;
import java.util.Map;
import javax.el.ValueExpression;
import javax.el.VariableMapper;

/**
 * <p>Mock implementation of <code>VariableMapper</code>.</p>
 *
 * @since 1.0.4
 */

public class MockVariableMapper extends VariableMapper {
    

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


    /** Creates a new instance of MockVariableMapper */
    public MockVariableMapper() {
    }
    

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


    /**
     * <p>Map of <code>ValueExpression</code>s, keyed by variable name.</p>
     */
    private Map expressions = new HashMap();


    // ----------------------------------------------------- Mock Object Methods


    // -------------------------------------------------- FunctionMapper Methods


    /** {@inheritDoc} */
    public ValueExpression resolveVariable(String variable) {

        return (ValueExpression) expressions.get(variable);

    }


    /** {@inheritDoc} */
    public ValueExpression setVariable(String variable, ValueExpression expression) {

        ValueExpression original = (ValueExpression) expressions.get(variable);
        if (expression == null) {
            expressions.remove(variable);
        } else {
            expressions.put(variable, expression);
        }
        return original;

    }


}