javax.xml.parsers.DocumentBuilder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// $Id: DocumentBuilder.java 584483 2007-10-14 02:54:48Z mrglavas $
package javax.xml.parsers;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.validation.Schema;
import org.w3c.dom.Document;
import org.w3c.dom.DOMImplementation;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* Defines the API to obtain DOM Document instances from an XML
* document. Using this class, an application programmer can obtain a
* {@link Document} from XML.
*
* An instance of this class can be obtained from the
* {@link DocumentBuilderFactory#newDocumentBuilder()} method. Once
* an instance of this class is obtained, XML can be parsed from a
* variety of input sources. These input sources are InputStreams,
* Files, URLs, and SAX InputSources.
*
* Note that this class reuses several classes from the SAX API. This
* does not require that the implementor of the underlying DOM
* implementation use a SAX parser to parse XML document into a
* Document. It merely requires that the implementation
* communicate with the application using these existing APIs.
*
* @author Jeff Suttor
* @version $Revision: 584483 $, $Date: 2007-10-13 22:54:48 -0400 (Sat, 13 Oct 2007) $
*/
public abstract class DocumentBuilder {
private static final boolean DEBUG = false;
/** Protected constructor */
protected DocumentBuilder () {
}
/**
*
Reset this DocumentBuilder to its original configuration.
*
* DocumentBuilder is reset to the same state as when it was created with
* {@link DocumentBuilderFactory#newDocumentBuilder()}.
* reset() is designed to allow the reuse of existing DocumentBuilders
* thus saving resources associated with the creation of new DocumentBuilders.
*
* The reset DocumentBuilder is not guaranteed to have the same {@link EntityResolver} or {@link ErrorHandler}
* Objects, e.g. {@link Object#equals(Object obj)}. It is guaranteed to have a functionally equal
* EntityResolver and ErrorHandler.
*
* @since 1.5
*/
public void reset() {
// implementors should override this method
throw new UnsupportedOperationException(
"This DocumentBuilder, \"" + this.getClass().getName() + "\", does not support the reset functionality."
+ " Specification \"" + this.getClass().getPackage().getSpecificationTitle() + "\""
+ " version \"" + this.getClass().getPackage().getSpecificationVersion() + "\""
);
}
/**
* Parse the content of the given InputStream as an XML
* document and return a new DOM {@link Document} object.
* An IllegalArgumentException is thrown if the
* InputStream is null.
*
* @param is InputStream containing the content to be parsed.
* @return Document result of parsing the
* InputStream
* @exception IOException If any IO errors occur.
* @exception SAXException If any parse errors occur.
* @see org.xml.sax.DocumentHandler
*/
public Document parse(InputStream is)
throws SAXException, IOException {
if (is == null) {
throw new IllegalArgumentException("InputStream cannot be null");
}
InputSource in = new InputSource(is);
return parse(in);
}
/**
* Parse the content of the given InputStream as an
* XML document and return a new DOM {@link Document} object.
* An IllegalArgumentException is thrown if the
* InputStream is null.
*
* @param is InputStream containing the content to be parsed.
* @param systemId Provide a base for resolving relative URIs.
* @return A new DOM Document object.
* @exception IOException If any IO errors occur.
* @exception SAXException If any parse errors occur.
* @see org.xml.sax.DocumentHandler
*/
public Document parse(InputStream is, String systemId)
throws SAXException, IOException {
if (is == null) {
throw new IllegalArgumentException("InputStream cannot be null");
}
InputSource in = new InputSource(is);
in.setSystemId(systemId);
return parse(in);
}
/**
* Parse the content of the given URI as an XML document
* and return a new DOM {@link Document} object.
* An IllegalArgumentException is thrown if the
* URI is null null.
*
* @param uri The location of the content to be parsed.
* @return A new DOM Document object.
* @exception IOException If any IO errors occur.
* @exception SAXException If any parse errors occur.
* @see org.xml.sax.DocumentHandler
*/
public Document parse(String uri)
throws SAXException, IOException {
if (uri == null) {
throw new IllegalArgumentException("URI cannot be null");
}
InputSource in = new InputSource(uri);
return parse(in);
}
/**
* Parse the content of the given file as an XML document
* and return a new DOM {@link Document} object.
* An IllegalArgumentException is thrown if the
* File is null null.
*
* @param f The file containing the XML to parse.
* @exception IOException If any IO errors occur.
* @exception SAXException If any parse errors occur.
* @see org.xml.sax.DocumentHandler
* @return A new DOM Document object.
*/
public Document parse(File f) throws SAXException, IOException {
if (f == null) {
throw new IllegalArgumentException("File cannot be null");
}
String escapedURI = FilePathToURI.filepath2URI(f.getAbsolutePath());
if (DEBUG) {
System.out.println("Escaped URI = " + escapedURI);
}
InputSource in = new InputSource(escapedURI);
return parse(in);
}
/**
* Parse the content of the given input source as an XML document
* and return a new DOM {@link Document} object.
* An IllegalArgumentException is thrown if the
* InputSource is null null.
*
* @param is InputSource containing the content to be parsed.
* @exception IOException If any IO errors occur.
* @exception SAXException If any parse errors occur.
* @see org.xml.sax.DocumentHandler
* @return A new DOM Document object.
*/
public abstract Document parse(InputSource is)
throws SAXException, IOException;
/**
* Indicates whether or not this parser is configured to
* understand namespaces.
*
* @return true if this parser is configured to understand
* namespaces; false otherwise.
*/
public abstract boolean isNamespaceAware();
/**
* Indicates whether or not this parser is configured to
* validate XML documents.
*
* @return true if this parser is configured to validate
* XML documents; false otherwise.
*/
public abstract boolean isValidating();
/**
* Specify the {@link EntityResolver} to be used to resolve
* entities present in the XML document to be parsed. Setting
* this to null will result in the underlying
* implementation using it's own default implementation and
* behavior.
*
* @param er The EntityResolver to be used to resolve entities
* present in the XML document to be parsed.
*/
public abstract void setEntityResolver(EntityResolver er);
/**
* Specify the {@link ErrorHandler} to be used by the parser.
* Setting this to null will result in the underlying
* implementation using it's own default implementation and
* behavior.
*
* @param eh The ErrorHandler to be used by the parser.
*/
public abstract void setErrorHandler(ErrorHandler eh);
/**
* Obtain a new instance of a DOM {@link Document} object
* to build a DOM tree with.
*
* @return A new instance of a DOM Document object.
*/
public abstract Document newDocument();
/**
* Obtain an instance of a {@link DOMImplementation} object.
*
* @return A new instance of a DOMImplementation.
*/
public abstract DOMImplementation getDOMImplementation();
/** Get a reference to the the {@link Schema} being used by
* the XML processor.
*
* If no schema is being used, null is returned.
*
* @return {@link Schema} being used or null
* if none in use
*
* @throws UnsupportedOperationException
* For backward compatibility, when implementations for
* earlier versions of JAXP is used, this exception will be
* thrown.
*
* @since 1.5
*/
public Schema getSchema() {
throw new UnsupportedOperationException(
"This parser does not support specification \""
+ this.getClass().getPackage().getSpecificationTitle()
+ "\" version \""
+ this.getClass().getPackage().getSpecificationVersion()
+ "\""
);
}
/**
* Get the XInclude processing mode for this parser.
*
* @return
* the return value of
* the {@link DocumentBuilderFactory#isXIncludeAware()}
* when this parser was created from factory.
*
* @throws UnsupportedOperationException
* For backward compatibility, when implementations for
* earlier versions of JAXP is used, this exception will be
* thrown.
*
* @since 1.5
*
* @see DocumentBuilderFactory#setXIncludeAware(boolean)
*/
public boolean isXIncludeAware() {
throw new UnsupportedOperationException(
"This parser does not support specification \""
+ this.getClass().getPackage().getSpecificationTitle()
+ "\" version \""
+ this.getClass().getPackage().getSpecificationVersion()
+ "\""
);
}
}