text: /*
   * Copyright 2015 The FireNio Project
   *
   * Licensed 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 com.firenio.buffer;
  
  import java.nio.ByteBuffer;
  
  /**
   * @author wangkai
   */
  class UnpooledHeapByteBuf extends HeapByteBuf {
  
      UnpooledHeapByteBuf(byte[] memory, int off, int len) {
          super(memory);
          this.abs_read_index = off;
          this.abs_write_index = len + off;
      }
  
      UnpooledHeapByteBuf(ByteBuffer memory) {
          super(memory);
          this.abs_read_index = 0;
          this.abs_write_index = memory.position();
      }
  
      @Override
      public int capacity() {
          return memory.length;
      }
  
      @Override
      public void expansion(int cap) {
          byte[] oldBuffer = memory;
          byte[] newBuffer = new byte[cap];
          if (hasReadableBytes()) {
              copy(oldBuffer, absReadIndex(), newBuffer, 0, readableBytes());
          }
          memory = newBuffer;
      }
  
      @Override
      public boolean isPooled() {
          return false;
      }
  
      @Override
      protected final void release0() {}
  
      @Override
      public void reset(ByteBuffer memory) {
          if (memory.isDirect()) {
              throw unsupportedOperationException();
          }
          this.referenceCount = 1;
          this.memory = memory.array();
          this.nioBuffer = memory;
          this.writeIndex(memory.limit());
          this.reverseRead();
      }
  
      @Override
      public void reset(byte[] memory, int off, int len) {
          this.referenceCount = 1;
          this.memory = memory;
          this.readIndex(off);
          this.writeIndex(off + len);
      }
  
      static final class EmptyByteBuf extends UnpooledHeapByteBuf {
  
          static final EmptyByteBuf EMPTY = new UnpooledHeapByteBuf.EmptyByteBuf();
  
          EmptyByteBuf() {
              super(new byte[]{}, 0, 0);
          }
  
          @Override
          public ByteBuf duplicate() {
              return this;
          }
  
          @Override
          public boolean isReleased() {
              return true;
          }
  
          @Override
          public void expansion(int cap) {
              throw unsupportedOperationException();
          }
  
          @Override
          public ByteBuf resetReadIndex() {
              throw unsupportedOperationException();
          }
  
          @Override
          public ByteBuf resetWriteIndex() {
              throw unsupportedOperationException();
          }
  
          @Override
          public ByteBuf readIndex(int index) {
              throw unsupportedOperationException();
          }
  
          @Override
          public ByteBuf writeIndex(int index) {
              throw unsupportedOperationException();
          }
  
      }
  
  }
  