| /* |
| * 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.ssl; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.qpid.proton.engine.impl.TransportInput; |
| import org.apache.qpid.proton.engine.impl.TransportOutput; |
| |
| /** |
| * I thinly wrap a {@link ByteBuffer} to facilitate its usage e.g. in {@link SimpleSslTransportWrapper}. |
| * At a given moment I am either in a state that is ready to be written to, or read from. |
| * To switch between these states, call {@link #prepareToRead()} or {@link #prepareToWrite()}, each of which returns the {@link ByteBuffer} |
| * ready to be used. |
| */ |
| public class ByteHolder |
| { |
| private final ByteBuffer _bytes; |
| |
| /** Creates me, initially in a writeable state */ |
| public ByteHolder(int capacity) |
| { |
| _bytes = ByteBuffer.allocate(capacity); |
| } |
| |
| public boolean hasSpace() |
| { |
| return _bytes.remaining() > 0; |
| } |
| |
| /** |
| * @return the total number of bytes I now contain |
| */ |
| public int writeOutputFrom(TransportOutput transportOutput) |
| { |
| byte[] byteArray = _bytes.array(); |
| int offset = _bytes.position(); |
| int numberOfBytesToGet = _bytes.remaining(); |
| |
| int numberOfBytesGot = transportOutput.output(byteArray, offset, numberOfBytesToGet); |
| |
| int newPosition = offset + numberOfBytesGot; |
| _bytes.position(newPosition); |
| return newPosition; |
| } |
| |
| /** |
| * @return a ByteBuffer wrapping the stored bytes, intended to be read from |
| */ |
| public ByteBuffer prepareToRead() |
| { |
| _bytes.flip(); |
| return _bytes; |
| } |
| |
| /** |
| * Read my bytes into the supplied destination |
| * @return the number of byte actually read (might be less than numberOfBytesRequested if I contain fewer bytes than that) |
| */ |
| public int readInto(byte[] destination, int offset, int numberOfBytesRequested) |
| { |
| int numberOfBytesToRead = Math.min(numberOfBytesRequested, _bytes.remaining()); |
| _bytes.get(destination, offset, numberOfBytesToRead); |
| return numberOfBytesToRead; |
| } |
| |
| /** |
| * @return whether all my bytes were read into the {@link TransportInput} (i.e. returns false if transportInput didn't accept all the bytes) |
| */ |
| public boolean readInto(TransportInput transportInput) |
| { |
| if(_bytes.hasRemaining()) |
| { |
| int offset = _bytes.position(); |
| int numberAccepted = transportInput.input(_bytes.array(), offset, _bytes.remaining()); |
| int newPosition = offset + numberAccepted; |
| _bytes.position(newPosition); |
| return !_bytes.hasRemaining(); |
| } |
| else |
| { |
| // nothing to do |
| return true; |
| } |
| } |
| |
| /** |
| * prepare me to be written to again |
| * @return a ByteBuffer, ready to be written to. |
| */ |
| public ByteBuffer prepareToWrite() |
| { |
| _bytes.compact(); |
| return _bytes; |
| } |
| |
| public int getCapacity() |
| { |
| return _bytes.capacity(); |
| } |
| |
| } |