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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 java.nio.charset.Charset;
import org.apache.thrift.TByteArrayOutputStream;
import org.apache.thrift.TConfiguration;
/** Memory buffer-based implementation of the TTransport interface. */
public class TMemoryBuffer extends TEndpointTransport {
/**
* Create a TMemoryBuffer with an initial buffer size of <i>size</i>. The internal buffer will
* grow as necessary to accommodate the size of the data being written to it.
*
* @param size the initial size of the buffer
* @throws TTransportException on error initializing the underlying transport.
*/
public TMemoryBuffer(int size) throws TTransportException {
super(new TConfiguration());
arr_ = new TByteArrayOutputStream(size);
updateKnownMessageSize(size);
}
/**
* Create a TMemoryBuffer with an initial buffer size of <i>size</i>. The internal buffer will
* grow as necessary to accommodate the size of the data being written to it.
*
* @param config the configuration to use.
* @param size the initial size of the buffer
* @throws TTransportException on error initializing the underlying transport.
*/
public TMemoryBuffer(TConfiguration config, int size) throws TTransportException {
super(config);
arr_ = new TByteArrayOutputStream(size);
updateKnownMessageSize(size);
}
@Override
public boolean isOpen() {
return true;
}
@Override
public void open() {
/* Do nothing */
}
@Override
public void close() {
/* Do nothing */
}
@Override
public int read(byte[] buf, int off, int len) throws TTransportException {
checkReadBytesAvailable(len);
byte[] src = arr_.get();
int amtToRead = (len > arr_.len() - pos_ ? arr_.len() - pos_ : len);
if (amtToRead > 0) {
System.arraycopy(src, pos_, buf, off, amtToRead);
pos_ += amtToRead;
}
return amtToRead;
}
@Override
public void write(byte[] buf, int off, int len) {
arr_.write(buf, off, len);
}
/**
* Output the contents of the memory buffer as a String, using the supplied encoding
*
* @param charset the encoding to use
* @return the contents of the memory buffer as a String
*/
public String toString(Charset charset) {
return arr_.toString(charset);
}
public String inspect() {
StringBuilder buf = new StringBuilder();
byte[] bytes = arr_.toByteArray();
for (int i = 0; i < bytes.length; i++) {
buf.append(pos_ == i ? "==>" : "").append(Integer.toHexString(bytes[i] & 0xff)).append(" ");
}
return buf.toString();
}
// The contents of the buffer
private TByteArrayOutputStream arr_;
// Position to read next byte from
private int pos_;
public int length() {
return arr_.size();
}
public byte[] getArray() {
return arr_.get();
}
}
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