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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2007-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.admin.util;

import javax.xml.parsers.ParserConfigurationException;
import org.glassfish.api.admin.InstanceState;
import org.w3c.dom.*;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.*;
import java.util.HashMap;
import org.xml.sax.SAXException;

/**
 * This parses the instance state file and sets up the InstanceState singleton object for use by
 * various parts of the system
 */
class InstanceStateFileProcessor {
    private Document xmlDoc = null;
    private File stateFile;
    private HashMap instanceStates;

    public InstanceStateFileProcessor(HashMap st, File xmlFile)
            throws IOException {
        instanceStates = st;
        stateFile = xmlFile;
        parse();
    }

    private void parse() throws IOException {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            factory.setIgnoringElementContentWhitespace(true);
            DocumentBuilder builder = factory.newDocumentBuilder();
            this.xmlDoc = builder.parse(stateFile);
            parseInstanceStateFile();
        } catch (SAXException se) {
            throw new IOException("Unable to parse instance state file", se);
        } catch (ParserConfigurationException pce) {
            throw new IOException("Unable to parse instance state file", pce);
        }
    }

    static public InstanceStateFileProcessor createNew(HashMap st, File xmlFileObject)
            throws IOException {
        BufferedWriter writer = null;
        try {
            writer = new BufferedWriter(new FileWriter(xmlFileObject));

            writer.write("");
            writer.newLine();
            writer.write("");
            writer.newLine();
            writer.write("false");
            writer.newLine();
            for (String s : st.keySet()) {
                writer.write("");
                writer.newLine();
            }
            writer.write("");
            writer.newLine();
            writer.flush();
        } finally {
            if (writer != null) {
                writer.close();
            }
        }
        return new InstanceStateFileProcessor(st, xmlFileObject);
    }

    public void addNewServer(String name) throws Exception {
        String newState = InstanceState.StateType.NEVER_STARTED.getDescription();
        Node i = findNode(name);
        if (i != null) {
            // deal with the case where an entry for this server was already
            // in the list. This can happen the first time the file is created.
            // In this case, remove the old information.
            removeInstanceNode(name);
        }
        addInstanceNode(name, newState);
        writeDoc();
    }

    private void parseInstanceStateFile() {
        NodeList list = xmlDoc.getElementsByTagName("instance");
        if(list==null) {
            return;
        }
        for(int i=0; i