/*
* 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.
*/
package org.apache.sling.bgservlets.impl.nodestream;
import java.io.IOException;
import java.io.InputStream;
import javax.jcr.Node;
import javax.jcr.Property;
import javax.jcr.RepositoryException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Reads data stored by a {@link NodeOutputStream}
* and rebuilds a continuous stream out of the
* multiple Properties that it creates.
*/
public class NodeInputStream extends InputStream {
private final Logger log = LoggerFactory.getLogger(getClass());
/** The Node under which we read our data */
private final Node node;
/** Computes path for stream storage */
private final NodeStreamPath streamPath;
/** Current stream that we are reading */
private InputStream currentStream;
public NodeInputStream(Node n) throws IOException {
node = n;
streamPath = new NodeStreamPath();
selectNextStream();
}
/** Select next property to read from and open its stream */
private void selectNextStream() throws IOException {
streamPath.selectNextPath();
final String propertyPath = streamPath.getNodePath() + "/" + NodeStreamPath.PROPERTY_NAME;
try {
if(node.hasProperty(propertyPath)) {
final Property p = node.getProperty(propertyPath);
currentStream = p.getStream();
log.debug("Switched to the InputStream of Property {}", p.getPath());
} else {
currentStream = null;
log.debug("Property {} not found, end of stream", node.getPath() + "/" + propertyPath);
}
} catch(RepositoryException re) {
throw (IOException)new IOException("RepositoryException in selectNextProperty()").initCause(re);
}
}
@Override
public int available() throws IOException {
return currentStream == null ? 0 : currentStream.available();
}
@Override
public void close() throws IOException {
if(currentStream != null) {
currentStream.close();
}
super.close();
}
@Override
public int read() throws IOException {
if(currentStream == null) {
return -1;
}
int result = currentStream.read();
if(result == -1) {
selectNextStream();
return read();
}
return result;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if(currentStream == null) {
return 0;
}
int result = currentStream.read(b, off, len);
if(result <= 0) {
selectNextStream();
return read(b, off, len);
}
return result;
}
@Override
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
}