/*
* Copyright (c) 2006, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* 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.wso2.carbon.mediator.transform.stream;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.stream.XMLStreamException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.mediator.transform.stream.IOElementPipe;
/**
* This class extends from InputStream.
* The data is retrieved from the IOElementPipe when reading from this class.
*/
public class ElementInputStream extends InputStream {
/** This pipe is used to get data to read*/
private IOElementPipe pipe;
private static final Log log = LogFactory.getLog(ElementInputStream.class);
/**
* Constructor which creates ElementInputStream object with IOElementPipe object.
* @param pipe
*/
public ElementInputStream(IOElementPipe pipe) {
this.pipe = pipe;
}
/**
* Read data to byte array by getting data from pipe.
*/
public synchronized int read(byte[] b, int off, int len) {
if (b == null) {
throw new NullPointerException("Null byte array passed to read data");
} else if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException("IndexOutOfBoundException when reading data");
}
if (len <= 0) {
return 0;
}
try {
// Get data from the pipe
byte[] btemp = this.pipe.getData(len, off);
if (len > btemp.length) {
len = btemp.length;
}
if (btemp.length == 0) {
this.pipe.closeConnections();
return -1;
}
System.arraycopy(btemp, 0, b, off, len);
} catch (XMLStreamException e) {
String errMessage = "Error in writting xml events";
log.error(errMessage);
} catch (IOException e) {
String errMessage = "Error in closing outputstream";
log.error(errMessage);
}
return len;
}
@Override
public int read() throws IOException {
byte[] buf = new byte[1];
int count = read(buf, 0, 1);
if (count > 0) {
return buf[0];
} else {
return -1;
}
}
}