org.semanticweb.owlapi.io.StreamDocumentSource Maven / Gradle / Ivy
/*
* This file is part of the OWL API.
*
* The contents of this file are subject to the LGPL License, Version 3.0.
*
* Copyright (C) 2011, The University of Manchester
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
*
* Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
* in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
*
* Copyright 2011, University of Manchester
*
* Licensed 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.
*/
package org.semanticweb.owlapi.io;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLRuntimeException;
/**
* An ontology document source which can read from a stream.
*
* @author Matthew Horridge, The University Of Manchester, Bio-Health
* Informatics Group, Date: 15-Nov-2007
*/
public class StreamDocumentSource implements OWLOntologyDocumentSource {
private static int counter = 0;
private final IRI documentIRI;
private byte[] buffer;
/**
* Constructs an input source which will read an ontology from a
* representation from the specified stream.
*
* @param is
* The stream that the ontology representation will be read from.
*/
public StreamDocumentSource(InputStream is) {
this(is, getNextDocumentIRI());
}
/** @return a fresh IRI */
public static synchronized IRI getNextDocumentIRI() {
counter = counter + 1;
return IRI.create("inputstream:ontology" + counter);
}
/**
* Constructs an input source which will read an ontology from a
* representation from the specified stream.
*
* @param stream
* The stream that the ontology representation will be read from.
* @param documentIRI
* The document IRI
*/
public StreamDocumentSource(InputStream stream, IRI documentIRI) {
this.documentIRI = documentIRI;
readIntoBuffer(stream);
}
/**
* Reads all the bytes from the specified stream into a temporary buffer,
* which is necessary because we may need to access the input stream more
* than once. In other words, this method caches the input stream.
*
* @param _reader
* The reader to be "cached"
*/
private void readIntoBuffer(InputStream _reader) {
try {
InputStream reader = new BOMSafeInputStream(_reader);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
final int length = 100000;
byte[] tempBuffer = new byte[length];
int read = 0;
do {
read = reader.read(tempBuffer, 0, length);
if (read > 0) {
bos.write(tempBuffer, 0, read);
}
} while (read > 0);
buffer = bos.toByteArray();
} catch (IOException e) {
throw new OWLOntologyInputSourceException(e);
}
}
@Override
public boolean isInputStreamAvailable() {
return true;
}
@Override
public InputStream getInputStream() {
try {
return new BOMSafeInputStream(new ByteArrayInputStream(buffer));
} catch (IOException e) {
throw new OWLOntologyInputSourceException(e);
}
}
@Override
public IRI getDocumentIRI() {
return documentIRI;
}
@Override
public Reader getReader() {
throw new OWLOntologyInputSourceException(
"Reader not available. Check with StreamDocumentSource.isReaderAvailable() first!");
}
@Override
public boolean isReaderAvailable() {
return false;
}
}