jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/doclets/internal/toolkit/builders/LayoutParser.java@4868a36f6fd8

     1 /*

     2  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package com.sun.tools.doclets.internal.toolkit.builders;

    27 import com.sun.tools.doclets.internal.toolkit.*;

    28 import com.sun.tools.doclets.internal.toolkit.util.*;

    29 import java.io.*;

    30 import java.util.*;

    31 import org.xml.sax.*;

    32 import org.xml.sax.helpers.DefaultHandler;

    33 import javax.xml.parsers.*;

    35 /**

    36  * Parse the XML that specified the order of operation for the builders.  This

    37  * Parser uses SAX parsing.

    38  *

    39  * @author Jamie Ho

    40  * @since 1.5

    41  * @see SAXParser

    42  */

    43 public class LayoutParser extends DefaultHandler {

    45     /**

    46      * The map of XML elements that have been parsed.

    47      */

    48     private Map<String,XMLNode> xmlElementsMap;

    49     private XMLNode currentNode;

    50     private Configuration configuration;

    51     private static LayoutParser instance;

    52     private String currentRoot;

    53     private boolean isParsing;

    55     /**

    56      * This class is a singleton.

    57      */

    58     private LayoutParser(Configuration configuration) {

    59         xmlElementsMap = new HashMap<String,XMLNode>();

    60         this.configuration = configuration;

    61     }

    63     /**

    64      * Return an instance of the BuilderXML.

    65      *

    66      * @param configuration the current configuration of the doclet.

    67      * @return an instance of the BuilderXML.

    68      */

    69     public static LayoutParser getInstance(Configuration configuration) {

    70         if (instance == null) {

    71             instance = new LayoutParser(configuration);

    72         }

    73         return instance;

    74     }

    76     /**

    77      * Parse the XML specifying the layout of the documentation.

    78      *

    79      * @return the list of XML elements parsed.

    80      */

    81     public XMLNode parseXML(String root) {

    82         if (xmlElementsMap.containsKey(root)) {

    83             return xmlElementsMap.get(root);

    84         }

    85         try {

    86             currentRoot = root;

    87             isParsing = false;

    88             SAXParserFactory factory = SAXParserFactory.newInstance();

    89             SAXParser saxParser = factory.newSAXParser();

    90             InputStream in = configuration.getBuilderXML();

    91             saxParser.parse(in, this);

    92             return xmlElementsMap.get(root);

    93         } catch (Throwable t) {

    94             t.printStackTrace();

    95             throw new DocletAbortException();

    96         }

    97     }

    99     /**

   100      * {@inheritDoc}

   101      */

   102     @Override

   103     public void startElement(String namespaceURI, String sName, String qName,

   104         Attributes attrs)

   105     throws SAXException {

   106         if (isParsing || qName.equals(currentRoot)) {

   107             isParsing = true;

   108             currentNode = new XMLNode(currentNode, qName);

   109             for (int i = 0; i < attrs.getLength(); i++)

   110                 currentNode.attrs.put(attrs.getLocalName(i), attrs.getValue(i));

   111             if (qName.equals(currentRoot))

   112                 xmlElementsMap.put(qName, currentNode);

   113         }

   114     }

   116     /**

   117      * {@inheritDoc}

   118      */

   119     @Override

   120     public void endElement(String namespaceURI, String sName, String qName)

   121     throws SAXException {

   122         if (! isParsing) {

   123             return;

   124         }

   125         currentNode = currentNode.parent;

   126         isParsing = ! qName.equals(currentRoot);

   127     }

   128 }

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