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/*
* 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.thrift.transport;
import org.apache.thrift.TConfiguration;
/** TTransport for reading from an AutoExpandingBuffer. */
public class AutoExpandingBufferReadTransport extends TEndpointTransport {
private final AutoExpandingBuffer buf;
private int pos = 0;
private int limit = 0;
public AutoExpandingBufferReadTransport(TConfiguration config, int initialCapacity)
throws TTransportException {
super(config);
this.buf = new AutoExpandingBuffer(initialCapacity);
}
public void fill(TTransport inTrans, int length) throws TTransportException {
buf.resizeIfNecessary(length);
inTrans.readAll(buf.array(), 0, length);
pos = 0;
limit = length;
}
@Override
public void close() {}
@Override
public boolean isOpen() {
return true;
}
@Override
public void open() throws TTransportException {}
@Override
public final int read(byte[] target, int off, int len) throws TTransportException {
int amtToRead = Math.min(len, getBytesRemainingInBuffer());
if (amtToRead > 0) {
System.arraycopy(buf.array(), pos, target, off, amtToRead);
consumeBuffer(amtToRead);
}
return amtToRead;
}
@Override
public void write(byte[] buf, int off, int len) throws TTransportException {
throw new UnsupportedOperationException();
}
@Override
public final void consumeBuffer(int len) {
pos += len;
}
@Override
public final byte[] getBuffer() {
return buf.array();
}
@Override
public final int getBufferPosition() {
return pos;
}
@Override
public final int getBytesRemainingInBuffer() {
return limit - pos;
}
}
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