com.sun.phobos.script.util.BindingsImpl Maven / Gradle / Ivy

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A js-engine.jar that provides a script engine "rhino" with old Rhino JavaScript. The source code for js-engine comes from https://java.net/projects/Scripting. The Rhino engine itself is pulled by maven. Its source is at https://github.com/mozilla/rhino.

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/*
 * Copyright (C) 2006 Sun Microsystems, Inc. All rights reserved. 
 * Use is subject to license terms.
 *
 * Redistribution and use in source and binary forms, with or without modification, are 
 * permitted provided that the following conditions are met: Redistributions of source code 
 * must retain the above copyright notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list of 
 * conditions and the following disclaimer in the documentation and/or other materials 
 * provided with the distribution. Neither the name of the Sun Microsystems nor the names of 
 * is contributors may be used to endorse or promote products derived from this software 
 * without specific prior written permission. 

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.sun.phobos.script.util;

import java.util.*;
import javax.script.Bindings;

/*
 * Abstract super class for Bindings implementations. Handles
 * global and local scopes.
 *
 * @author Mike Grogan
 * @version 1.0
 * @since 1.6
 */
public abstract class BindingsImpl extends BindingsBase {
    
    //get method delegates to global if key is not defined in
    //base class or local scope
    protected Bindings global = null;
    
    //get delegates to local scope
    protected Bindings local = null;
    
    public void setGlobal(Bindings n) {
        global = n;
    }
    
    public void setLocal(Bindings n) {
        local = n;
    }
    
    public  Set> entrySet() {
        return new BindingsEntrySet(this);
    }
    
    public Object get(Object key) {
        checkKey(key);
        
        Object ret  = null;
        if ((local != null) && (null != (ret = local.get(key)))) {
            return ret;
        }
        
        ret = getImpl((String)key);
        
        if (ret != null) {
            return ret;
        } else if (global != null) {
            return global.get(key);
        } else {
            return null;
        }
    }
    
    public Object remove(Object key) {
        checkKey(key);
        Object ret = get(key);
        if (ret != null) {
            removeImpl((String)key);
        }
        return ret;
    }
}