/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * The contents of this file are subject to the Netscape Public * License Version 1.1 (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.mozilla.org/NPL/ * * Software distributed under the License is distributed on an "AS * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or * implied. See the License for the specific language governing * rights and limitations under the License. * * The Original Code is Rhino code, released * May 6, 1998. * * The Initial Developer of the Original Code is Netscape * Communications Corporation.  Portions created by Netscape are * Copyright (C) 1997-1999 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the * terms of the GNU Public License (the "GPL"), in which case the * provisions of the GPL are applicable instead of those above. * If you wish to allow use of your version of this file only * under the terms of the GPL and not to allow others to use your * version of this file under the NPL, indicate your decision by * deleting the provisions above and replace them with the notice * and other provisions required by the GPL.  If you do not delete * the provisions above, a recipient may use your version of this * file under either the NPL or the GPL. *//*        Environment.java        Wraps java.lang.System properties.        by Patrick C. Beard <beard@netscape.com> */package org.mozilla.javascript.tools.shell;import org.mozilla.javascript.Scriptable;import org.mozilla.javascript.ScriptRuntime;import org.mozilla.javascript.ScriptableObject;import java.util.Vector;import java.util.Enumeration;import java.util.Properties;/** * Environment, intended to be instantiated at global scope, provides * a natural way to access System properties from JavaScript. * * @author Patrick C. Beard */public class Environment extends ScriptableObject{    static final long serialVersionUID = -430727378460177065L;    private Environment thePrototypeInstance = null;    public static void defineClass(ScriptableObject scope) {        try {            ScriptableObject.defineClass(scope, Environment.class);        } catch (Exception e) {            throw new Error(e.getMessage());        }    }    public String getClassName() {        return "Environment";    }    public Environment() {        if (thePrototypeInstance == null)            thePrototypeInstance = this;    }    public Environment(ScriptableObject scope) {        setParentScope(scope);        Object ctor = ScriptRuntime.getTopLevelProp(scope, "Environment");        if (ctor != null && ctor instanceof Scriptable) {            Scriptable s = (Scriptable) ctor;            setPrototype((Scriptable) s.get("prototype", s));        }    }    public boolean has(String name, Scriptable start) {        if (this == thePrototypeInstance)            return super.has(name, start);        return (System.getProperty(name) != null);    }    public Object get(String name, Scriptable start) {        if (this == thePrototypeInstance)            return super.get(name, start);        String result = System.getProperty(name);        if (result != null)            return ScriptRuntime.toObject(getParentScope(), result);        else            return Scriptable.NOT_FOUND;    }    public void put(String name, Scriptable start, Object value) {        if (this == thePrototypeInstance)            super.put(name, start, value);        else            System.getProperties().put(name, ScriptRuntime.toString(value));    }    private Object[] collectIds() {        Properties props = System.getProperties();        Enumeration names = props.propertyNames();        Vector keys = new Vector();        while (names.hasMoreElements())            keys.addElement(names.nextElement());        Object[] ids = new Object[keys.size()];        keys.copyInto(ids);        return ids;    }    public Object[] getIds() {        if (this == thePrototypeInstance)            return super.getIds();        return collectIds();    }    public Object[] getAllIds() {        if (this == thePrototypeInstance)            return super.getAllIds();        return collectIds();    }}