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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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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.activemq.artemis.utils;

import java.io.IOException;
import java.io.InputStream;

import org.apache.activemq.artemis.api.core.ActiveMQBuffer;

/**
 * Used to send large messages
 */
public class ActiveMQBufferInputStream extends InputStream {

   /* (non-Javadoc)
    * @see java.io.InputStream#read()
    */

   private ActiveMQBuffer bb;


   public ActiveMQBufferInputStream(final ActiveMQBuffer paramByteBuffer) {
      bb = paramByteBuffer;
   }

   @Override
   public int read() throws IOException {
      if (bb == null) {
         throw new IOException("read on a closed InputStream");
      }

      if (remainingBytes() == 0) {
         return -1;
      } else {
         return bb.readByte() & 0xFF;
      }
   }

   @Override
   public int read(final byte[] byteArray) throws IOException {
      if (bb == null) {
         throw new IOException("read on a closed InputStream");
      }

      return read(byteArray, 0, byteArray.length);
   }

   @Override
   public int read(final byte[] byteArray, final int off, final int len) throws IOException {
      if (bb == null) {
         throw new IOException("read on a closed InputStream");
      }

      if (byteArray == null) {
         throw new NullPointerException();
      }
      if (off < 0 || off > byteArray.length || len < 0 || off + len > byteArray.length || off + len < 0) {
         throw new IndexOutOfBoundsException();
      }
      if (len == 0) {
         return 0;
      }

      int size = Math.min(remainingBytes(), len);

      if (size == 0) {
         return -1;
      }

      bb.readBytes(byteArray, off, size);
      return size;
   }

   @Override
   public long skip(final long len) throws IOException {
      if (bb == null) {
         throw new IOException("skip on a closed InputStream");
      }

      if (len <= 0L) {
         return 0L;
      }

      int size = Math.min(remainingBytes(), (int) len);

      bb.skipBytes(size);

      return size;
   }

   @Override
   public int available() throws IOException {
      if (bb == null) {
         throw new IOException("available on a closed InputStream");
      }

      return remainingBytes();
   }

   @Override
   public void close() throws IOException {
      bb = null;
   }

   @Override
   public synchronized void mark(final int paramInt) {
   }

   @Override
   public synchronized void reset() throws IOException {
      throw new IOException("mark/reset not supported");
   }

   @Override
   public boolean markSupported() {
      return false;
   }

   /**
    * @return
    */
   private int remainingBytes() {
      return bb.writerIndex() - bb.readerIndex();
   }

}