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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
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package com.sun.jersey.json.impl;
import java.io.IOException;
import java.io.InputStream;
/**
*
* @author Jakub.Podlesak@Sun.COM
*/
public abstract class FilteringInputStream extends InputStream {
private byte[] currentBuffer;
private int cursor;
protected abstract byte[] nextBytes() throws IOException;
@Override
public int available() throws IOException {
if (currentBuffer == null) {
return 0;
}
return currentBuffer.length - cursor;
}
@Override
public synchronized void mark(int readlimit) {
throw new UnsupportedOperationException();
}
@Override
public boolean markSupported() {
return false;
}
private void getNextBytesIfNothingAvailable() throws IOException {
if (available() < 1) {
currentBuffer = nextBytes();
cursor = 0;
}
}
public int read() throws IOException {
getNextBytesIfNothingAvailable();
if((currentBuffer == null) || (currentBuffer.length == 0)) {
return -1;
}
return currentBuffer[cursor++];
}
@Override
public int read(byte[] b) throws IOException {
return this.read(b, 0, b.length);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
getNextBytesIfNothingAvailable();
if (currentBuffer == null) {
return -1;
}
int availableBytes = currentBuffer.length - cursor;
if (len >= availableBytes) {
System.arraycopy(currentBuffer, cursor, b, off, availableBytes);
currentBuffer = null;
return availableBytes;
} else {
System.arraycopy(currentBuffer, cursor, b, off, len);
cursor += len;
return len;
}
}
@Override
public synchronized void reset() throws IOException {
throw new IOException();
}
@Override
public long skip(long n) throws IOException {
return super.skip(n);
}
@Override
public String toString() {
return super.toString();
}
}