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The Apache Commons JEXL library is an implementation of the JSTL Expression Language with extensions.

There is a newer version: 3.4.0

/*
 * 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.commons.jexl3;

import java.util.HashMap;
import java.util.Map;

/**
 * Wraps a map in a context.
 * Each entry in the map is considered a variable name, value pair.
 */
public class MapContext implements JexlContext {

    /**
     * The wrapped variable map.
     */
    private final Map map;

    /**
     * Creates a MapContext on an automatically allocated underlying HashMap.
     */
    public MapContext() {
        this(null);
    }

    /**
     * Creates a MapContext wrapping an existing user provided map.
     * 
     * @param vars the variable map
     */
    public MapContext(Map vars) {
        map = vars == null ? new HashMap() : vars;
    }

    @Override
    public boolean has(String name) {
        return map.containsKey(name);
    }

    @Override
    public Object get(String name) {
        return map.get(name);
    }

    @Override
    public void set(String name, Object value) {
        map.put(name, value);
    }

    /**
     * Clears all variables.
     */
    public void clear() {
        map.clear();
    }
}