| /* |
| * 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.qpid.proton.engine.impl; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.qpid.proton.engine.Transport; |
| import org.apache.qpid.proton.engine.TransportException; |
| |
| public class ByteBufferUtils |
| { |
| /** |
| * @return number of bytes poured |
| */ |
| public static int pour(ByteBuffer source, ByteBuffer destination) |
| { |
| int numberOfBytesToPour = Math.min(source.remaining(), destination.remaining()); |
| ByteBuffer sourceSubBuffer = source.duplicate(); |
| sourceSubBuffer.limit(sourceSubBuffer.position() + numberOfBytesToPour); |
| destination.put(sourceSubBuffer); |
| source.position(source.position() + numberOfBytesToPour); |
| return numberOfBytesToPour; |
| } |
| |
| /** |
| * Assumes {@code destination} is ready to be written. |
| * |
| * @return number of bytes poured which may be fewer than {@code sizeRequested} if |
| * {@code destination} has insufficient remaining |
| */ |
| public static int pourArrayToBuffer(byte[] source, int offset, int sizeRequested, ByteBuffer destination) |
| { |
| int numberToWrite = Math.min(destination.remaining(), sizeRequested); |
| destination.put(source, offset, numberToWrite); |
| return numberToWrite; |
| } |
| |
| /** |
| * Pours the contents of {@code source} into {@code destinationTransportInput}, calling |
| * the TransportInput many times if necessary. If the TransportInput returns a {@link org.apache.qpid.proton.engine.TransportResult} |
| * other than ok, data may remain in source. |
| */ |
| public static int pourAll(ByteBuffer source, TransportInput destinationTransportInput) throws TransportException |
| { |
| int capacity = destinationTransportInput.capacity(); |
| if (capacity == Transport.END_OF_STREAM) |
| { |
| if (source.hasRemaining()) { |
| throw new IllegalStateException("Destination has reached end of stream: " + |
| destinationTransportInput); |
| } else { |
| return Transport.END_OF_STREAM; |
| } |
| } |
| |
| int total = source.remaining(); |
| |
| while(source.hasRemaining() && destinationTransportInput.capacity() > 0) |
| { |
| pour(source, destinationTransportInput.tail()); |
| destinationTransportInput.process(); |
| } |
| |
| return total - source.remaining(); |
| } |
| |
| /** |
| * Assumes {@code source} is ready to be read. |
| * |
| * @return number of bytes poured which may be fewer than {@code sizeRequested} if |
| * {@code source} has insufficient remaining |
| */ |
| public static int pourBufferToArray(ByteBuffer source, byte[] destination, int offset, int sizeRequested) |
| { |
| int numberToRead = Math.min(source.remaining(), sizeRequested); |
| source.get(destination, offset, numberToRead); |
| return numberToRead; |
| } |
| |
| public static ByteBuffer newWriteableBuffer(int capacity) |
| { |
| ByteBuffer newBuffer = ByteBuffer.allocate(capacity); |
| return newBuffer; |
| } |
| |
| public static ByteBuffer newReadableBuffer(int capacity) |
| { |
| ByteBuffer newBuffer = ByteBuffer.allocate(capacity); |
| newBuffer.flip(); |
| return newBuffer; |
| } |
| |
| } |