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Java example source code file (SAXBufferCreator.java)

This example Java source code file (SAXBufferCreator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractcreator, contenthandler, entityresolver, flag_uri, inputsource, inputstream, ioexception, lexicalhandler, locator, mutablexmlstreambuffer, sax, saxbuffercreator, saxexception, string, t_namespace_attribute

The SAXBufferCreator.java Java example source code

/*
 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.xml.internal.stream.buffer.sax;

import com.sun.xml.internal.stream.buffer.AbstractCreator;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import com.sun.xml.internal.stream.buffer.MutableXMLStreamBuffer;
import java.io.IOException;
import java.io.InputStream;
import org.xml.sax.ContentHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.LexicalHandler;

/**
 * Writes into {@link MutableXMLStreamBuffer} from SAX.
 *
 * TODO
 * Implement the marking the stream on the element when an ID
 * attribute on the element is defined
 */
public class SAXBufferCreator extends AbstractCreator
        implements EntityResolver, DTDHandler, ContentHandler, ErrorHandler, LexicalHandler {
    protected String[] _namespaceAttributes;

    protected int _namespaceAttributesPtr;

    private int depth = 0;

    public SAXBufferCreator() {
        _namespaceAttributes = new String[16 * 2];
    }

    public SAXBufferCreator(MutableXMLStreamBuffer buffer) {
        this();
        setBuffer(buffer);
    }

    public MutableXMLStreamBuffer create(XMLReader reader, InputStream in) throws IOException, SAXException {
        return create(reader, in, null);
    }

    public MutableXMLStreamBuffer create(XMLReader reader, InputStream in, String systemId) throws IOException, SAXException {
        if (_buffer == null) {
            createBuffer();
        }
        _buffer.setSystemId(systemId);
        reader.setContentHandler(this);
        reader.setProperty(Properties.LEXICAL_HANDLER_PROPERTY, this);

        try {
            setHasInternedStrings(reader.getFeature(Features.STRING_INTERNING_FEATURE));
        } catch (SAXException e) {
        }


        if (systemId != null) {
            InputSource s = new InputSource(systemId);
            s.setByteStream(in);
            reader.parse(s);
        } else {
            reader.parse(new InputSource(in));
        }

        return getXMLStreamBuffer();
    }

    public void reset() {
        _buffer = null;
        _namespaceAttributesPtr = 0;
        depth=0;
    }

    public void startDocument() throws SAXException {
        storeStructure(T_DOCUMENT);
    }

    public void endDocument() throws SAXException {
        storeStructure(T_END);
    }

    public void startPrefixMapping(String prefix, String uri) throws SAXException {
        cacheNamespaceAttribute(prefix, uri);
    }

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        storeQualifiedName(T_ELEMENT_LN,
                uri, localName, qName);

        // Has namespaces attributes
        if (_namespaceAttributesPtr > 0) {
            storeNamespaceAttributes();
        }

        // Has attributes
        if (attributes.getLength() > 0) {
            storeAttributes(attributes);
        }
        depth++;
    }

    public void endElement(String uri, String localName, String qName) throws SAXException {
        storeStructure(T_END);
        if(--depth==0)
            increaseTreeCount();    // one tree processed
    }

    public void characters(char ch[], int start, int length) throws SAXException {
        storeContentCharacters(T_TEXT_AS_CHAR_ARRAY, ch, start, length);
    }

    public void ignorableWhitespace(char ch[], int start, int length) throws SAXException {
        characters(ch, start, length);
    }

    public void processingInstruction(String target, String data) throws SAXException {
        storeStructure(T_PROCESSING_INSTRUCTION);
        storeStructureString(target);
        storeStructureString(data);
    }

    public void comment(char[] ch, int start, int length) throws SAXException {
        storeContentCharacters(T_COMMENT_AS_CHAR_ARRAY, ch, start, length);
    }

    //

    private void cacheNamespaceAttribute(String prefix, String uri) {
        _namespaceAttributes[_namespaceAttributesPtr++] = prefix;
        _namespaceAttributes[_namespaceAttributesPtr++] = uri;

        if (_namespaceAttributesPtr == _namespaceAttributes.length) {
            final String[] namespaceAttributes = new String[_namespaceAttributesPtr * 2];
            System.arraycopy(_namespaceAttributes, 0, namespaceAttributes, 0, _namespaceAttributesPtr);
            _namespaceAttributes = namespaceAttributes;
        }
    }

    private void storeNamespaceAttributes() {
        for (int i = 0; i < _namespaceAttributesPtr; i += 2) {
            int item = T_NAMESPACE_ATTRIBUTE;
            if (_namespaceAttributes[i].length() > 0) {
                item |= FLAG_PREFIX;
                storeStructureString(_namespaceAttributes[i]);
            }
            if (_namespaceAttributes[i + 1].length() > 0) {
                item |= FLAG_URI;
                storeStructureString(_namespaceAttributes[i + 1]);
            }
            storeStructure(item);
        }
        _namespaceAttributesPtr = 0;
    }

    private void storeAttributes(Attributes attributes) {
        for (int i = 0; i < attributes.getLength(); i++) {
            // Skip NS attributes. Some versions of JDK seem to send wrong local name
            // Also it is not stored correctly by the following.
            if (attributes.getQName(i).startsWith("xmlns"))
                continue;
            storeQualifiedName(T_ATTRIBUTE_LN,
                    attributes.getURI(i),
                    attributes.getLocalName(i),
                    attributes.getQName(i));

            storeStructureString(attributes.getType(i));
            storeContentString(attributes.getValue(i));
        }
    }

    private void storeQualifiedName(int item, String uri, String localName, String qName) {
        if (uri.length() > 0) {
            item |= FLAG_URI;
            storeStructureString(uri);
        }

        storeStructureString(localName);

        if (qName.indexOf(':') >= 0) {
            item |= FLAG_QUALIFIED_NAME;
            storeStructureString(qName);
        }

        storeStructure(item);
    }


    // Empty methods for SAX handlers

    // Entity resolver handler

    public InputSource resolveEntity (String publicId, String systemId)
        throws IOException, SAXException
    {
        return null;
    }

    // DTD handler

    public void notationDecl (String name, String publicId, String systemId)
        throws SAXException
    { }

    public void unparsedEntityDecl (String name, String publicId,
                                    String systemId, String notationName)
        throws SAXException
    { }

    // Content handler

    public void setDocumentLocator (Locator locator) { }

    public void endPrefixMapping (String prefix) throws SAXException { }

    public void skippedEntity (String name) throws SAXException { }

    // Lexical handler

    public void startDTD(String name, String publicId, String systemId) throws SAXException { }

    public void endDTD() throws SAXException { }

    public void startEntity(String name) throws SAXException { }

    public void endEntity(String name) throws SAXException { }

    public void startCDATA() throws SAXException { }

    public void endCDATA() throws SAXException { }

    // Error handler

    public void warning(SAXParseException e) throws SAXException { }

    public void error(SAXParseException e) throws SAXException { }

    public void fatalError(SAXParseException e) throws SAXException
    {
        throw e;
    }
}

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