xmllib.java

java中比较著名的js引擎当属mozilla开源的rhino

/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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, 1999.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Igor Bukanov
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (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
 * MPL, indicate your decision by deleting the provisions above and replacing
 * 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 MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.mozilla.javascript.xml;

import org.mozilla.javascript.*;

public abstract class XMLLib
{
    private static final Object XML_LIB_KEY = new Object();

    public static XMLLib extractFromScopeOrNull(Scriptable scope)
    {
        ScriptableObject so = ScriptRuntime.getLibraryScopeOrNull(scope);
        if (so == null) {
            // If librray is not yet initialized, return null
            return null;
        }

        // Ensure lazily initialization of real XML library instance
        // which is done on first access to XML property
        ScriptableObject.getProperty(so, "XML");

        return (XMLLib)so.getAssociatedValue(XML_LIB_KEY);
    }

    public static XMLLib extractFromScope(Scriptable scope)
    {
        XMLLib lib = extractFromScopeOrNull(scope);
        if (lib != null) {
            return lib;
        }
        String msg = ScriptRuntime.getMessage0("msg.XML.not.available");
        throw Context.reportRuntimeError(msg);
    }

    protected final XMLLib bindToScope(Scriptable scope)
    {
        ScriptableObject so = ScriptRuntime.getLibraryScopeOrNull(scope);
        if (so == null) {
            // standard library should be initialized at this point
            throw new IllegalStateException();
        }
        return (XMLLib)so.associateValue(XML_LIB_KEY, this);
    }

    public abstract boolean isXMLName(Context cx, Object name);

    public abstract Ref nameRef(Context cx, Object name,
                                Scriptable scope, int memberTypeFlags);

    public abstract Ref nameRef(Context cx, Object namespace, Object name,
                                Scriptable scope, int memberTypeFlags);

    /**
     * Escapes the reserved characters in a value of an attribute
     * and surround it by "".
     *
     * @param value Unescaped text
     * @return The escaped text
     */
    public abstract String escapeAttributeValue(Object value);

    /**
     * Escapes the reserved characters in a value of a text node
     *
     * @param value Unescaped text
     * @return The escaped text
     */
    public abstract String escapeTextValue(Object value);


    /**
     * Construct namespace for default xml statement.
     */
    public abstract Object toDefaultXmlNamespace(Context cx, Object uriValue);
}