/*
* 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.axiom.attachments.utils;
import org.apache.axiom.attachments.impl.BufferUtils;
import org.apache.axiom.ext.io.ReadFromSupport;
import org.apache.axiom.ext.io.StreamCopyException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
/**
* BAAOutputStream is like a ByteArrayOutputStream.
* A ByteArrayOutputStream stores the backing data in a byte[].
* BAAOutputStream stores the backing data in a Array of
* byte[]. Using several non-contiguous chunks reduces
* memory copy and resizing.
*/
public class BAAOutputStream extends OutputStream implements ReadFromSupport {
ArrayList data = new ArrayList();
final static int BUFFER_SIZE = BufferUtils.BUFFER_LEN;
int index = 0;
byte[] currBuffer = null;
public BAAOutputStream() {
super();
addBuffer();
}
private void addBuffer() {
currBuffer = new byte[BUFFER_SIZE];
data.add(currBuffer);
index = 0;
}
public void write(byte[] b, int off, int len) throws IOException {
int total = 0;
while (total < len) {
int copy = Math.min(len-total, BUFFER_SIZE-index);
System.arraycopy(b, off, currBuffer, index, copy);
total += copy;
index += copy;
off += copy;
if (index >= BUFFER_SIZE) {
addBuffer();
}
}
}
public void write(byte[] b) throws IOException {
this.write(b, 0, b.length);
}
byte[] writeByte = new byte[1];
public void write(int b) throws IOException {
writeByte[0] = (byte) b;
this.write(writeByte, 0, 1);
}
public ArrayList buffers() {
return data;
}
public int length() {
return (BUFFER_SIZE * (data.size()-1)) + index;
}
/**
* @param is InputStream containing data
* @param maxRead the maximum number of bytes to receive
* @return bytesReceived
*/
public long receive(InputStream is, long maxRead) throws IOException {
return readFrom(is, maxRead);
}
public long readFrom(InputStream is, long maxRead) throws StreamCopyException {
if (maxRead == -1) {
maxRead = Long.MAX_VALUE;
}
long bytesReceived = 0;
// Now directly write to the buffers
boolean done = false;
while (!done) {
// Don't get more than will fit in the current buffer
int len = (int) Math.min(BUFFER_SIZE - index, maxRead-bytesReceived);
// Now get the bytes
int bytesRead;
try {
bytesRead = is.read(currBuffer, index, len);
} catch (IOException ex) {
throw new StreamCopyException(StreamCopyException.READ, ex);
}
if (bytesRead >= 0) {
bytesReceived += bytesRead;
index += bytesRead;
if (index >= BUFFER_SIZE) {
addBuffer();
}
if (bytesReceived >= maxRead) {
done = true;
}
} else {
done = true;
}
}
return bytesReceived;
}
}