Package org.apache.commons.jexl

Source Code of org.apache.commons.jexl.JexlHelper

/*
* 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.jexl;

import org.apache.commons.jexl.context.HashMapContext;

/**
*  Helper to create a context.  In the current implementation of JEXL, there
*  is one implementation of JexlContext - {@link HashMapContext}, and there
*  is no reason not to directly instantiate {@link HashMapContext} in your
*  own application.
*
@since 1.0
@version $Id$
*/
public class JexlHelper {
    /** singleton instance. */
    protected static JexlHelper helper = new JexlHelper();

    /** @return the single instance. */
    protected static JexlHelper getInstance() {
        return helper;
    }

    /**
     * Returns a new {@link JexlContext}.
     * @return a new JexlContext
     */
    public static JexlContext createContext() {
        return getInstance().newContext();
    }

    /**
     * Creates and returns a new {@link JexlContext}
     * The current implementation creates a new instance of
     * {@link HashMapContext}.
     * @return a new JexlContext
     */
    protected JexlContext newContext() {
        return new HashMapContext();
    }
}
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