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package org.codehaus.plexus.interpolation;

/*
 * Copyright 2007 The Codehaus Foundation.
 *
 * Licensed 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.
 */

import java.util.Map;

/**
 * Wraps a Map, and looks up the whole expression as a single key, returning the
 * value mapped to it.
 */
public class MapBasedValueSource extends AbstractValueSource {

    private final Map values;

    /**
     * Construct a new value source to wrap the supplied map.
     * @param values key,value of mapping.
     */
    public MapBasedValueSource(Map values) {
        super(false);
        this.values = values;
    }

    /**
     * Lookup the supplied expression as a key in the wrapped Map, and return
     * its value.
     */
    public Object getValue(String expression) {
        return values == null ? null : values.get(expression);
    }
}