no.hal.scxml.javascript.JavascriptContext.java Source code

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Here is the source code for no.hal.scxml.javascript.JavascriptContext.java

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/*******************************************************************************
 * Copyright (c) 2008 Hallvard Trtteberg.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Hallvard Trtteberg - initial API and implementation
 ******************************************************************************/
package no.hal.scxml.javascript;

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

import org.apache.commons.scxml.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

public class JavascriptContext extends ScriptableObject implements Context {

    public String getClassName() {
        return "SCXMLContext";
    }

    public JavascriptContext(JavascriptContext parentScope) {
        setParentScope(parentScope);
    }

    //

    private Map<String, Object> vars = null;

    public void reset() {
        vars = null;
    }

    public Map getVars() {
        return (vars == null ? Collections.EMPTY_MAP : vars);
    }

    //

    public Context getParent() {
        Scriptable parentScope = getParentScope();
        return parentScope instanceof JavascriptContext ? (JavascriptContext) parentScope : null;
    }

    private boolean hasLocal(String name) {
        return (vars != null && vars.containsKey(name));
    }

    public boolean has(String name) {
        if (hasLocal(name)) {
            return true;
        }
        return (getParent() != null && getParent().has(name));
    }

    public Object get(String name) {
        if (hasLocal(name)) {
            return vars.get(name);
        }
        return (getParent() != null ? getParent().get(name) : null);
    }

    public void set(String name, Object value) {
        if (hasLocal(name)) {
            setLocal(name, value);
        } else if (getParent() != null) {
            getParent().set(name, value);
        }
    }

    protected Object wrap(Object value) {
        return value;
    }

    public void setLocal(String name, Object value) {
        if (vars == null) {
            vars = new HashMap<String, Object>();
        }
        vars.put(name, value);
        super.put(name, this, wrap(value));
    }

    public void put(String name, Scriptable start, Object value) {
        if (hasLocal(name)) {
            setLocal(name, value);
        } else {
            super.put(name, start, wrap(value));
        }
    }
}