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Cobra is the rendering engine designed for LoboBrowser
/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: [email protected]
*/
/*
* Created on Oct 15, 2005
*/
package org.cobraparser.html.parser;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilder;
import org.cobraparser.html.HtmlRendererContext;
import org.cobraparser.html.domimpl.DOMImplementationImpl;
import org.cobraparser.html.domimpl.HTMLDocumentImpl;
import org.cobraparser.html.io.WritableLineReader;
import org.cobraparser.ua.UserAgentContext;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* The DocumentBuilderImpl class is an HTML DOM parser that
* implements the standard W3C DocumentBuilder interface.
*
* @author J. H. S.
*/
public class DocumentBuilderImpl extends DocumentBuilder {
private static final Logger logger = Logger.getLogger(DocumentBuilderImpl.class.getName());
private EntityResolver resolver;
private ErrorHandler errorHandler;
private final UserAgentContext bcontext;
private final HtmlRendererContext rcontext;
/**
* Constructs a DocumentBuilderImpl. This constructor should be
* used when only the parsing functionality (without rendering) is required.
*
* @param context
* An instance of {@link org.cobraparser.html.UserAgentContext},
* which may be an instance of
* {@link org.cobraparser.html.test.SimpleUserAgentContext}.
*/
public DocumentBuilderImpl(final UserAgentContext context) {
this.rcontext = null;
this.bcontext = context;
}
/**
* Constructs a DocumentBuilderImpl. This constructor should be
* used when rendering is expected.
*
* @param ucontext
* An instance of {@link org.cobraparser.html.UserAgentContext},
* which may be an instance of
* {@link org.cobraparser.html.test.SimpleUserAgentContext}.
* @param rcontext
* An instance of {@link org.cobraparser.html.HtmlRendererContext},
* which may be an instance of
* {@link org.cobraparser.html.test.SimpleHtmlRendererContext}.
*/
public DocumentBuilderImpl(final UserAgentContext ucontext, final HtmlRendererContext rcontext) {
this.rcontext = rcontext;
this.bcontext = ucontext;
}
/**
* Constructs a DocumentBuilderImpl. This constructor should be
* used when rendering is expected.
*
* @param rcontext
* An instance of {@link org.cobraparser.html.HtmlRendererContext},
* which may be an instance of
* {@link org.cobraparser.html.test.SimpleHtmlRendererContext}.
*/
public DocumentBuilderImpl(final HtmlRendererContext rcontext) {
this.rcontext = rcontext;
this.bcontext = rcontext.getUserAgentContext();
}
/**
* Parses an HTML document. Note that this method will read the entire input
* source before returning a Document instance.
*
* @param is
* The input source, which may be an instance of
* {@link InputSourceImpl}.
* @see #createDocument(InputSource)
*/
@Override
public Document parse(final InputSource is) throws SAXException, IOException {
final HTMLDocumentImpl document = (HTMLDocumentImpl) this.createDocument(is, "");
document.load();
return document;
}
/**
* Creates a document without parsing the input provided, so the document
* object can be used for incremental rendering.
*
* @param is
* The input source, which may be an instance of
* {@link InputSourceImpl}. The input
* source must provide either an input stream or a reader.
* @see HTMLDocumentImpl#load()
*/
public Document createDocument(final InputSource is, final String contentType) throws SAXException, IOException {
final String encoding = is.getEncoding();
String charset = encoding;
if (charset == null) {
charset = "US-ASCII";
}
final String uri = is.getSystemId();
if (uri == null) {
logger.warning("parse(): InputSource has no SystemId (URI); document item URLs will not be resolvable.");
}
WritableLineReader wis;
final Reader reader = is.getCharacterStream();
if (reader != null) {
wis = new WritableLineReader(reader);
} else {
final InputStream in = is.getByteStream();
if (in != null) {
wis = new WritableLineReader(new InputStreamReader(in, charset));
} else if (uri != null) {
throw new IllegalArgumentException("The input source didn't have a character stream, nor an inputstream!");
/*
// To comply with the InputSource documentation, we need
// to do this:
final java.net.URLConnection connection = new java.net.URL(uri).openConnection();
in = connection.getInputStream();
if (encoding == null) {
charset = org.cobraparser.util.Urls.getCharset(connection);
}
wis = new WritableLineReader(new InputStreamReader(in, charset));
*/
} else {
throw new IllegalArgumentException("The InputSource must have either a reader, an input stream or a URI.");
}
}
final HTMLDocumentImpl document = new HTMLDocumentImpl(this.bcontext, this.rcontext, wis, uri, contentType);
return document;
}
@Override
public boolean isNamespaceAware() {
return false;
}
@Override
public boolean isValidating() {
return false;
}
@Override
public void setEntityResolver(final EntityResolver er) {
this.resolver = er;
}
@Override
public void setErrorHandler(final ErrorHandler eh) {
this.errorHandler = eh;
}
@Override
public Document newDocument() {
return new HTMLDocumentImpl(this.bcontext);
}
private DOMImplementation domImplementation;
@Override
public DOMImplementation getDOMImplementation() {
synchronized (this) {
if (this.domImplementation == null) {
this.domImplementation = new DOMImplementationImpl(this.bcontext);
}
return this.domImplementation;
}
}
public ErrorHandler getErrorHandler() {
return errorHandler;
}
public EntityResolver getResolver() {
return resolver;
}
}