001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.activemq.transport.nio; 018 019import java.io.IOException; 020import java.io.InputStream; 021import java.nio.BufferUnderflowException; 022import java.nio.ByteBuffer; 023 024/** 025 * An optimized buffered input stream for Tcp 026 * 027 * 028 */ 029public class NIOInputStream extends InputStream { 030 031 protected int count; 032 protected int position; 033 private final ByteBuffer in; 034 035 public NIOInputStream(ByteBuffer in) { 036 this.in = in; 037 } 038 039 public int read() throws IOException { 040 try { 041 int rc = in.get() & 0xff; 042 return rc; 043 } catch (BufferUnderflowException e) { 044 return -1; 045 } 046 } 047 048 public int read(byte b[], int off, int len) throws IOException { 049 if (in.hasRemaining()) { 050 int rc = Math.min(len, in.remaining()); 051 in.get(b, off, rc); 052 return rc; 053 } else { 054 return len == 0 ? 0 : -1; 055 } 056 } 057 058 public long skip(long n) throws IOException { 059 int rc = Math.min((int)n, in.remaining()); 060 in.position(in.position() + rc); 061 return rc; 062 } 063 064 public int available() throws IOException { 065 return in.remaining(); 066 } 067 068 public boolean markSupported() { 069 return false; 070 } 071 072 public void close() throws IOException { 073 } 074}