/*
* 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: StreamSource.java 829971 2009-10-26 21:15:39Z mrglavas $
package javax.xml.transform.stream;
import java.io.File;
import java.io.InputStream;
import java.io.Reader;
import javax.xml.transform.Source;
/**
* <p>Acts as an holder for a transformation Source in the form
* of a stream of XML markup.</p>
*
* <p><em>Note:</em> Due to their internal use of either a {@link Reader} or {@link InputStream} instance,
* <code>StreamSource</code> instances may only be used once.</p>
*
* @author <a href="Jeff.Suttor@Sun.com">Jeff Suttor</a>
* @version $Revision: 829971 $, $Date: 2009-10-26 14:15:39 -0700 (Mon, 26 Oct 2009) $
*/
public class StreamSource implements Source {
/** If {@link javax.xml.transform.TransformerFactory#getFeature}
* returns true when passed this value as an argument,
* the Transformer supports Source input of this type.
*/
public static final String FEATURE =
"http://javax.xml.transform.stream.StreamSource/feature";
/**
* <p>Zero-argument default constructor. If this constructor is used, and
* no Stream source is set using
* {@link #setInputStream(java.io.InputStream inputStream)} or
* {@link #setReader(java.io.Reader reader)}, then the
* <code>Transformer</code> will
* create an empty source {@link java.io.InputStream} using
* {@link java.io.InputStream#InputStream() new InputStream()}.</p>
*
* @see javax.xml.transform.Transformer#transform(Source xmlSource, Result outputTarget)
*/
public StreamSource() { }
/**
* Construct a StreamSource from a byte stream. Normally,
* a stream should be used rather than a reader, so
* the XML parser can resolve character encoding specified
* by the XML declaration.
*
* <p>If this constructor is used to process a stylesheet, normally
* setSystemId should also be called, so that relative URI references
* can be resolved.</p>
*
* @param inputStream A valid InputStream reference to an XML stream.
*/
public StreamSource(InputStream inputStream) {
setInputStream(inputStream);
}
/**
* Construct a StreamSource from a byte stream. Normally,
* a stream should be used rather than a reader, so that
* the XML parser can resolve character encoding specified
* by the XML declaration.
*
* <p>This constructor allows the systemID to be set in addition
* to the input stream, which allows relative URIs
* to be processed.</p>
*
* @param inputStream A valid InputStream reference to an XML stream.
* @param systemId Must be a String that conforms to the URI syntax.
*/
public StreamSource(InputStream inputStream, String systemId) {
setInputStream(inputStream);
setSystemId(systemId);
}
/**
* Construct a StreamSource from a character reader. Normally,
* a stream should be used rather than a reader, so that
* the XML parser can resolve character encoding specified
* by the XML declaration. However, in many cases the encoding
* of the input stream is already resolved, as in the case of
* reading XML from a StringReader.
*
* @param reader A valid Reader reference to an XML character stream.
*/
public StreamSource(Reader reader) {
setReader(reader);
}
/**
* Construct a StreamSource from a character reader. Normally,
* a stream should be used rather than a reader, so that
* the XML parser may resolve character encoding specified
* by the XML declaration. However, in many cases the encoding
* of the input stream is already resolved, as in the case of
* reading XML from a StringReader.
*
* @param reader A valid Reader reference to an XML character stream.
* @param systemId Must be a String that conforms to the URI syntax.
*/
public StreamSource(Reader reader, String systemId) {
setReader(reader);
setSystemId(systemId);
}
/**
* Construct a StreamSource from a URL.
*
* @param systemId Must be a String that conforms to the URI syntax.
*/
public StreamSource(String systemId) {
this.systemId = systemId;
}
/**
* Construct a StreamSource from a File.
*
* @param f Must a non-null File reference.
*/
public StreamSource(File f) {
setSystemId(f);
}
/**
* Set the byte stream to be used as input. Normally,
* a stream should be used rather than a reader, so that
* the XML parser can resolve character encoding specified
* by the XML declaration.
*
* <p>If this Source object is used to process a stylesheet, normally
* setSystemId should also be called, so that relative URL references
* can be resolved.</p>
*
* @param inputStream A valid InputStream reference to an XML stream.
*/
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
/**
* Get the byte stream that was set with setByteStream.
*
* @return The byte stream that was set with setByteStream, or null
* if setByteStream or the ByteStream constructor was not called.
*/
public InputStream getInputStream() {
return inputStream;
}
/**
* Set the input to be a character reader. Normally,
* a stream should be used rather than a reader, so that
* the XML parser can resolve character encoding specified
* by the XML declaration. However, in many cases the encoding
* of the input stream is already resolved, as in the case of
* reading XML from a StringReader.
*
* @param reader A valid Reader reference to an XML CharacterStream.
*/
public void setReader(Reader reader) {
this.reader = reader;
}
/**
* Get the character stream that was set with setReader.
*
* @return The character stream that was set with setReader, or null
* if setReader or the Reader constructor was not called.
*/
public Reader getReader() {
return reader;
}
/**
* Set the public identifier for this Source.
*
* <p>The public identifier is always optional: if the application
* writer includes one, it will be provided as part of the
* location information.</p>
*
* @param publicId The public identifier as a string.
*/
public void setPublicId(String publicId) {
this.publicId = publicId;
}
/**
* Get the public identifier that was set with setPublicId.
*
* @return The public identifier that was set with setPublicId, or null
* if setPublicId was not called.
*/
public String getPublicId() {
return publicId;
}
/**
* Set the system identifier for this Source.
*
* <p>The system identifier is optional if there is a byte stream
* or a character stream, but it is still useful to provide one,
* since the application can use it to resolve relative URIs
* and can include it in error messages and warnings (the parser
* will attempt to open a connection to the URI only if
* there is no byte stream or character stream specified).</p>
*
* @param systemId The system identifier as a URL string.
*/
public void setSystemId(String systemId) {
this.systemId = systemId;
}
/**
* Get the system identifier that was set with setSystemId.
*
* @return The system identifier that was set with setSystemId, or null
* if setSystemId was not called.
*/
public String getSystemId() {
return systemId;
}
/**
* Set the system ID from a File reference.
*
* @param f Must a non-null File reference.
*/
public void setSystemId(File f) {
this.systemId = FilePathToURI.filepath2URI(f.getAbsolutePath());
}
//////////////////////////////////////////////////////////////////////
// Internal state.
//////////////////////////////////////////////////////////////////////
/**
* The public identifier for this input source, or null.
*/
private String publicId;
/**
* The system identifier as a URL string, or null.
*/
private String systemId;
/**
* The byte stream for this Source, or null.
*/
private InputStream inputStream;
/**
* The character stream for this Source, or null.
*/
private Reader reader;
}