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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 writing to an AutoExpandingBuffer.
*/
public final class AutoExpandingBufferWriteTransport extends TEndpointTransport {
private final AutoExpandingBuffer buf;
private int pos;
private int res;
/**
* Constructor.
* @param config the configuration to use. Currently used for defining the maximum message size.
* @param initialCapacity the initial capacity of the buffer
* @param frontReserve space, if any, to reserve at the beginning such
* that the first write is after this reserve.
* This allows framed transport to reserve space
* for the frame buffer length.
* @throws IllegalArgumentException if initialCapacity is less than one
* @throws IllegalArgumentException if frontReserve is less than zero
* @throws IllegalArgumentException if frontReserve is greater than initialCapacity
*/
public AutoExpandingBufferWriteTransport(TConfiguration config, int initialCapacity, int frontReserve) throws TTransportException {
super(config);
if (initialCapacity < 1) {
throw new IllegalArgumentException("initialCapacity");
}
if (frontReserve < 0 || initialCapacity < frontReserve) {
throw new IllegalArgumentException("frontReserve");
}
this.buf = new AutoExpandingBuffer(initialCapacity);
this.pos = frontReserve;
this.res = frontReserve;
}
@Override
public void close() {}
@Override
public boolean isOpen() {return true;}
@Override
public void open() throws TTransportException {}
@Override
public int read(byte[] buf, int off, int len) throws TTransportException {
throw new UnsupportedOperationException();
}
@Override
public void write(byte[] toWrite, int off, int len) throws TTransportException {
buf.resizeIfNecessary(pos + len);
System.arraycopy(toWrite, off, buf.array(), pos, len);
pos += len;
}
public AutoExpandingBuffer getBuf() {
return buf;
}
/**
* @return length of the buffer, including any front reserve
*/
public int getLength() {
return pos;
}
public void reset() {
pos = res;
}
}
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