/*
    *  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.mina.util.byteaccess;
  
  import java.nio.ByteOrder;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  
  import org.apache.mina.core.buffer.IoBuffer;
  import org.apache.mina.util.byteaccess.ByteArrayList.Node;
  
  /**
   * A ByteArray composed of other ByteArrays. Optimised for fast relative access
   * via cursors. Absolute access methods are provided, but may perform poorly.
   *
   * TODO: Write about laziness of cursor implementation - how movement doesn't
   * happen until actual get/put.
   * 
   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
   */
  public final class CompositeByteArray extends AbstractByteArray {
  
      /**
       * Allows for efficient detection of component boundaries when using a cursor.
       *
       * TODO: Is this interface right?
       */
      public interface CursorListener {
  
          /**
           * Called when the first component in the composite is entered by the cursor.
           */
          public void enteredFirstComponent(int componentIndex, ByteArray component);
  
          /**
           * Called when the next component in the composite is entered by the cursor.
           */
          public void enteredNextComponent(int componentIndex, ByteArray component);
  
          /**
           * Called when the previous component in the composite is entered by the cursor.
           */
          public void enteredPreviousComponent(int componentIndex, ByteArray component);
  
          /**
           * Called when the last component in the composite is entered by the cursor.
           */
          public void enteredLastComponent(int componentIndex, ByteArray component);
      }
  
      /**
       * Stores the underlying <code>ByteArray</code>s.
       */
      private final ByteArrayList bas = new ByteArrayList();
  
      /**
       * The byte order for data in the buffer
       */
      private ByteOrder order;
  
      /**
       * May be used in <code>getSingleIoBuffer</code>. Optional.
       */
      private final ByteArrayFactory byteArrayFactory;
  
      /**
       * Creates a new instance of CompositeByteArray.
       */
      public CompositeByteArray() {
          this(null);
      }
  
      /**
       * 
       * Creates a new instance of CompositeByteArray.
       *
       * @param byteArrayFactory
       *  The factory used to create the ByteArray objects
       */
      public CompositeByteArray(ByteArrayFactory byteArrayFactory) {
          this.byteArrayFactory = byteArrayFactory;
     }
 
     /**
      * Returns the first {@link ByteArray} in the list
      *
      * @return
      *  The first ByteArray in the list
      */
     public ByteArray getFirst() {
         if (bas.isEmpty()) {
             return null;
         }
 
         return bas.getFirst().getByteArray();
     }
 
     /**
      * Adds the specified {@link ByteArray} to the first
      * position in the list
      *
      * @param ba
      *  The ByteArray to add to the list
      */
     public void addFirst(ByteArray ba) {
         addHook(ba);
         bas.addFirst(ba);
     }
 
     /**
      * Remove the first {@link ByteArray} in the list
      *
      * @return
      *  The first ByteArray in the list
      */
     public ByteArray removeFirst() {
         Node node = bas.removeFirst();
         return node == null ? null : node.getByteArray();
     }
 
     /**
      * Remove component <code>ByteArray</code>s to the given index (splitting
      * them if necessary) and returning them in a single <code>ByteArray</code>.
      * The caller is responsible for freeing the returned object.
      *
      * TODO: Document free behaviour more thoroughly.
      */
     public ByteArray removeTo(int index) {
         if (index < first() || index > last()) {
             throw new IndexOutOfBoundsException();
         }
 
         // Removing
         CompositeByteArray prefix = new CompositeByteArray(byteArrayFactory);
         int remaining = index - first();
 
         while (remaining > 0) {
             ByteArray component = removeFirst();
 
             if (component.last() <= remaining) {
                 // Remove entire component.
                 prefix.addLast(component);
                 remaining -= component.last();
             } else {
                 // Remove part of component. Do this by removing entire
                 // component then readding remaining bytes.
                 // TODO: Consider using getIoBuffers(), as would avoid
                 // performance problems for nested ComponentByteArrays.
                 IoBuffer bb = component.getSingleIoBuffer();
                 // get the limit of the buffer
                 int originalLimit = bb.limit();
                 // set the position to the beginning of the buffer
                 bb.position(0);
                 // set the limit of the buffer to what is remaining
                 bb.limit(remaining);
                 // create a new IoBuffer, sharing the data with 'bb'
                 IoBuffer bb1 = bb.slice();
                 // set the position at the end of the buffer
                 bb.position(remaining);
                 // gets the limit of the buffer
                 bb.limit(originalLimit);
                 // create a new IoBuffer, sharing teh data with 'bb'
                 IoBuffer bb2 = bb.slice();
                 // create a new ByteArray with 'bb1'
                 ByteArray ba1 = new BufferByteArray(bb1) {
                     @Override
                     public void free() {
                         // Do not free.  This will get freed 
                     }
                 };
 
                 // add the new ByteArray to the CompositeByteArray
                 prefix.addLast(ba1);
                 remaining -= ba1.last();
 
                 // final for anonymous inner class
                 final ByteArray componentFinal = component;
                 ByteArray ba2 = new BufferByteArray(bb2) {
                     @Override
                     public void free() {
                         componentFinal.free();
                     }
                 };
                 // add the new ByteArray to the CompositeByteArray
                 addFirst(ba2);
             }
         }
 
         // return the CompositeByteArray
         return prefix;
     }
 
     /**
      * Adds the specified {@link ByteArray} to the end of the list
      *
      * @param ba
      *  The ByteArray to add to the end of the list
      */
     public void addLast(ByteArray ba) {
         addHook(ba);
         bas.addLast(ba);
     }
 
     /**
      * Removes the last {@link ByteArray} in the list
      *
      * @return
      *  The ByteArray that was removed
      */
     public ByteArray removeLast() {
         Node node = bas.removeLast();
         return node == null ? null : node.getByteArray();
     }
 
     /**
      * @inheritDoc
      */
     public void free() {
         while (!bas.isEmpty()) {
             Node node = bas.getLast();
             node.getByteArray().free();
             bas.removeLast();
         }
     }
 
     private void checkBounds(int index, int accessSize) {
         int lower = index;
         int upper = index + accessSize;
 
         if (lower < first()) {
             throw new IndexOutOfBoundsException("Index " + lower + " less than start " + first() + ".");
         }
 
         if (upper > last()) {
             throw new IndexOutOfBoundsException("Index " + upper + " greater than length " + last() + ".");
         }
     }
 
     /**
      * @inheritDoc
      */
     public Iterable<IoBuffer> getIoBuffers() {
         if (bas.isEmpty()) {
             return Collections.emptyList();
         }
 
         Collection<IoBuffer> result = new ArrayList<IoBuffer>();
         Node node = bas.getFirst();
 
         for (IoBuffer bb : node.getByteArray().getIoBuffers()) {
             result.add(bb);
         }
 
         while (node.hasNextNode()) {
             node = node.getNextNode();
 
             for (IoBuffer bb : node.getByteArray().getIoBuffers()) {
                 result.add(bb);
             }
         }
 
         return result;
     }
 
     /**
      * @inheritDoc
      */
     public IoBuffer getSingleIoBuffer() {
         if (byteArrayFactory == null) {
             throw new IllegalStateException(
                     "Can't get single buffer from CompositeByteArray unless it has a ByteArrayFactory.");
         }
 
         if (bas.isEmpty()) {
             ByteArray ba = byteArrayFactory.create(1);
             return ba.getSingleIoBuffer();
         }
 
         int actualLength = last() - first();
 
         {
             Node node = bas.getFirst();
             ByteArray ba = node.getByteArray();
 
             if (ba.last() == actualLength) {
                 return ba.getSingleIoBuffer();
             }
         }
 
         // Replace all nodes with a single node.
         ByteArray target = byteArrayFactory.create(actualLength);
         IoBuffer bb = target.getSingleIoBuffer();
         Cursor cursor = cursor();
         cursor.put(bb); // Copy all existing data into target IoBuffer.
 
         while (!bas.isEmpty()) {
             Node node = bas.getLast();
             ByteArray component = node.getByteArray();
             bas.removeLast();
             component.free();
         }
 
         bas.addLast(target);
         return bb;
     }
 
     /**
      * @inheritDoc
      */
     public Cursor cursor() {
         return new CursorImpl();
     }
 
     /**
      * @inheritDoc
      */
     public Cursor cursor(int index) {
         return new CursorImpl(index);
     }
 
     /**
      * Get a cursor starting at index 0 (which may not be the start of the
      * array) and with the given listener.
      * 
      * @param listener
      *  Returns a new {@link Cursor} instance
      */
     public Cursor cursor(CursorListener listener) {
         return new CursorImpl(listener);
     }
 
     /**
      * Get a cursor starting at the given index and with the given listener.
      * 
      * @param index
      *  The position of the array to start the Cursor at
      * @param listener
      *  The listener for the Cursor that is returned
      */
     public Cursor cursor(int index, CursorListener listener) {
         return new CursorImpl(index, listener);
     }
 
     /**
      * @inheritDoc
      */
     public ByteArray slice(int index, int length) {
         return cursor(index).slice(length);
     }
 
     /**
      * @inheritDoc
      */
     public byte get(int index) {
         return cursor(index).get();
     }
 
     /**
      * @inheritDoc
      */
     public void put(int index, byte b) {
         cursor(index).put(b);
     }
 
     /**
      * @inheritDoc
      */
     public void get(int index, IoBuffer bb) {
         cursor(index).get(bb);
     }
 
     /**
      * @inheritDoc
      */
     public void put(int index, IoBuffer bb) {
         cursor(index).put(bb);
     }
 
     /**
      * @inheritDoc
      */
     public int first() {
         return bas.firstByte();
     }
 
     /**
      * @inheritDoc
      */
     public int last() {
         return bas.lastByte();
     }
 
     /**
      * This method should be called prior to adding any component
      * <code>ByteArray</code> to a composite.
      *
      * @param ba
      *  The component to add.
      */
     private void addHook(ByteArray ba) {
         // Check first() is zero, otherwise cursor might not work.
         // TODO: Remove this restriction?
         if (ba.first() != 0) {
             throw new IllegalArgumentException("Cannot add byte array that doesn't start from 0: " + ba.first());
         }
         // Check order.
         if (order == null) {
             order = ba.order();
         } else if (!order.equals(ba.order())) {
             throw new IllegalArgumentException("Cannot add byte array with different byte order: " + ba.order());
         }
     }
 
     /**
      * @inheritDoc
      */
     public ByteOrder order() {
         if (order == null) {
             throw new IllegalStateException("Byte order not yet set.");
         }
         return order;
     }
 
     /**
      * @inheritDoc
      */
     public void order(ByteOrder order) {
         if (order == null || !order.equals(this.order)) {
             this.order = order;
 
             if (!bas.isEmpty()) {
                 for (Node node = bas.getFirst(); node.hasNextNode(); node = node.getNextNode()) {
                     node.getByteArray().order(order);
                 }
             }
         }
     }
 
     /**
      * @inheritDoc
      */
     public short getShort(int index) {
         return cursor(index).getShort();
     }
 
     /**
      * @inheritDoc
      */
     public void putShort(int index, short s) {
         cursor(index).putShort(s);
     }
 
     /**
      * @inheritDoc
      */
     public int getInt(int index) {
         return cursor(index).getInt();
     }
 
     /**
      * @inheritDoc
      */
     public void putInt(int index, int i) {
         cursor(index).putInt(i);
     }
 
     /**
      * @inheritDoc
      */
     public long getLong(int index) {
         return cursor(index).getLong();
     }
 
     /**
      * @inheritDoc
      */
     public void putLong(int index, long l) {
         cursor(index).putLong(l);
     }
 
     /**
      * @inheritDoc
      */
     public float getFloat(int index) {
         return cursor(index).getFloat();
     }
 
     /**
      * @inheritDoc
      */
     public void putFloat(int index, float f) {
         cursor(index).putFloat(f);
     }
 
     /**
      * @inheritDoc
      */
     public double getDouble(int index) {
         return cursor(index).getDouble();
     }
 
     /**
      * @inheritDoc
      */
     public void putDouble(int index, double d) {
         cursor(index).putDouble(d);
     }
 
     /**
      * @inheritDoc
      */
     public char getChar(int index) {
         return cursor(index).getChar();
     }
 
     /**
      * @inheritDoc
      */
     public void putChar(int index, char c) {
         cursor(index).putChar(c);
     }
 
     private class CursorImpl implements Cursor {
 
         private int index;
 
         private final CursorListener listener;
 
         private Node componentNode;
 
         // Index of start of current component.
         private int componentIndex;
 
         // Cursor within current component.
         private ByteArray.Cursor componentCursor;
 
         public CursorImpl() {
             this(0, null);
         }
 
         public CursorImpl(int index) {
             this(index, null);
         }
 
         public CursorImpl(CursorListener listener) {
             this(0, listener);
         }
 
         public CursorImpl(int index, CursorListener listener) {
             this.index = index;
             this.listener = listener;
         }
 
         /**
          * @inheritDoc
          */
         public int getIndex() {
             return index;
         }
 
         /**
          * @inheritDoc
          */
         public void setIndex(int index) {
             checkBounds(index, 0);
             this.index = index;
         }
 
         /**
          * @inheritDoc
          */
         public void skip(int length) {
             setIndex(index + length);
         }
 
         /**
          * @inheritDoc
          */
         public ByteArray slice(int length) {
             CompositeByteArray slice = new CompositeByteArray(byteArrayFactory);
             int remaining = length;
             while (remaining > 0) {
                 prepareForAccess(remaining);
                 int componentSliceSize = Math.min(remaining, componentCursor.getRemaining());
                 ByteArray componentSlice = componentCursor.slice(componentSliceSize);
                 slice.addLast(componentSlice);
                 index += componentSliceSize;
                 remaining -= componentSliceSize;
             }
             return slice;
         }
 
         /**
          * @inheritDoc
          */
         public ByteOrder order() {
             return CompositeByteArray.this.order();
         }
 
         private void prepareForAccess(int accessSize) {
             // Handle removed node. Do this first so we can remove the reference
             // even if bounds checking fails.
             if (componentNode != null && componentNode.isRemoved()) {
                 componentNode = null;
                 componentCursor = null;
             }
 
             // Bounds checks
             checkBounds(index, accessSize);
 
             // Remember the current node so we can later tell whether or not we
             // need to create a new cursor.
             Node oldComponentNode = componentNode;
 
             // Handle missing node.
             if (componentNode == null) {
                 int basMidpoint = (last() - first()) / 2 + first();
                 if (index <= basMidpoint) {
                     // Search from the start.
                     componentNode = bas.getFirst();
                     componentIndex = first();
                     if (listener != null) {
                         listener.enteredFirstComponent(componentIndex, componentNode.getByteArray());
                     }
                 } else {
                     // Search from the end.
                     componentNode = bas.getLast();
                     componentIndex = last() - componentNode.getByteArray().last();
                     if (listener != null) {
                         listener.enteredLastComponent(componentIndex, componentNode.getByteArray());
                     }
                 }
             }
 
             // Go back, if necessary.
             while (index < componentIndex) {
                 componentNode = componentNode.getPreviousNode();
                 componentIndex -= componentNode.getByteArray().last();
                 if (listener != null) {
                     listener.enteredPreviousComponent(componentIndex, componentNode.getByteArray());
                 }
             }
 
             // Go forward, if necessary.
             while (index >= componentIndex + componentNode.getByteArray().length()) {
                 componentIndex += componentNode.getByteArray().last();
                 componentNode = componentNode.getNextNode();
                 if (listener != null) {
                     listener.enteredNextComponent(componentIndex, componentNode.getByteArray());
                 }
             }
 
             // Update the cursor.
             int internalComponentIndex = index - componentIndex;
             if (componentNode == oldComponentNode) {
                 // Move existing cursor.
                 componentCursor.setIndex(internalComponentIndex);
             } else {
                 // Create new cursor.
                 componentCursor = componentNode.getByteArray().cursor(internalComponentIndex);
             }
         }
 
         /**
          * @inheritDoc
          */
         public int getRemaining() {
             return last() - index + 1;
         }
 
         /**
          * @inheritDoc
          */
         public boolean hasRemaining() {
             return getRemaining() > 0;
         }
 
         /**
          * @inheritDoc
          */
         public byte get() {
             prepareForAccess(1);
             byte b = componentCursor.get();
             index += 1;
             return b;
         }
 
         /**
          * @inheritDoc
          */
         public void put(byte b) {
             prepareForAccess(1);
             componentCursor.put(b);
             index += 1;
         }
 
         /**
          * @inheritDoc
          */
         public void get(IoBuffer bb) {
             while (bb.hasRemaining()) {
                 int remainingBefore = bb.remaining();
                 prepareForAccess(remainingBefore);
                 componentCursor.get(bb);
                 int remainingAfter = bb.remaining();
                 // Advance index by actual amount got.
                 int chunkSize = remainingBefore - remainingAfter;
                 index += chunkSize;
             }
         }
 
         /**
          * @inheritDoc
          */
         public void put(IoBuffer bb) {
             while (bb.hasRemaining()) {
                 int remainingBefore = bb.remaining();
                 prepareForAccess(remainingBefore);
                 componentCursor.put(bb);
                 int remainingAfter = bb.remaining();
                 // Advance index by actual amount put.
                 int chunkSize = remainingBefore - remainingAfter;
                 index += chunkSize;
             }
         }
 
         /**
          * @inheritDoc
          */
         public short getShort() {
             prepareForAccess(2);
             if (componentCursor.getRemaining() >= 4) {
                 short s = componentCursor.getShort();
                 index += 2;
                 return s;
             } else {
                 byte b0 = get();
                 byte b1 = get();
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     return (short) ((b0 << 8) | (b1 << 0));
                 } else {
                     return (short) ((b1 << 8) | (b0 << 0));
                 }
             }
         }
 
         /**
          * @inheritDoc
          */
         public void putShort(short s) {
             prepareForAccess(2);
             if (componentCursor.getRemaining() >= 4) {
                 componentCursor.putShort(s);
                 index += 2;
             } else {
                 byte b0;
                 byte b1;
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     b0 = (byte) ((s >> 8) & 0xff);
                     b1 = (byte) ((s >> 0) & 0xff);
                 } else {
                     b0 = (byte) ((s >> 0) & 0xff);
                     b1 = (byte) ((s >> 8) & 0xff);
                 }
                 put(b0);
                 put(b1);
             }
         }
 
         /**
          * @inheritDoc
          */
         public int getInt() {
             prepareForAccess(4);
             if (componentCursor.getRemaining() >= 4) {
                 int i = componentCursor.getInt();
                 index += 4;
                 return i;
             } else {
                 byte b0 = get();
                 byte b1 = get();
                 byte b2 = get();
                 byte b3 = get();
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     return ((b0 << 24) | (b1 << 16) | (b2 << 8) | (b3 << 0));
                 } else {
                     return ((b3 << 24) | (b2 << 16) | (b1 << 8) | (b0 << 0));
                 }
             }
         }
 
         /**
          * @inheritDoc
          */
         public void putInt(int i) {
             prepareForAccess(4);
             if (componentCursor.getRemaining() >= 4) {
                 componentCursor.putInt(i);
                 index += 4;
             } else {
                 byte b0;
                 byte b1;
                 byte b2;
                 byte b3;
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     b0 = (byte) ((i >> 24) & 0xff);
                     b1 = (byte) ((i >> 16) & 0xff);
                     b2 = (byte) ((i >> 8) & 0xff);
                     b3 = (byte) ((i >> 0) & 0xff);
                 } else {
                     b0 = (byte) ((i >> 0) & 0xff);
                     b1 = (byte) ((i >> 8) & 0xff);
                     b2 = (byte) ((i >> 16) & 0xff);
                     b3 = (byte) ((i >> 24) & 0xff);
                 }
                 put(b0);
                 put(b1);
                 put(b2);
                 put(b3);
             }
         }
 
         /**
          * @inheritDoc
          */
         public long getLong() {
             prepareForAccess(8);
             if (componentCursor.getRemaining() >= 4) {
                 long l = componentCursor.getLong();
                 index += 8;
                 return l;
             } else {
                 byte b0 = get();
                 byte b1 = get();
                 byte b2 = get();
                 byte b3 = get();
                 byte b4 = get();
                 byte b5 = get();
                 byte b6 = get();
                 byte b7 = get();
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     return ((b0 & 0xffL) << 56) | ((b1 & 0xffL) << 48) | ((b2 & 0xffL) << 40) | ((b3 & 0xffL) << 32)
                             | ((b4 & 0xffL) << 24) | ((b5 & 0xffL) << 16) | ((b6 & 0xffL) << 8) | ((b7 & 0xffL) << 0);
                 } else {
                     return ((b7 & 0xffL) << 56) | ((b6 & 0xffL) << 48) | ((b5 & 0xffL) << 40) | ((b4 & 0xffL) << 32)
                             | ((b3 & 0xffL) << 24) | ((b2 & 0xffL) << 16) | ((b1 & 0xffL) << 8) | ((b0 & 0xffL) << 0);
                 }
             }
         }
 
         /**
          * @inheritDoc
          */
         public void putLong(long l) {
             //TODO: see if there is some optimizing that can be done here
             prepareForAccess(8);
             if (componentCursor.getRemaining() >= 4) {
                 componentCursor.putLong(l);
                 index += 8;
             } else {
                 byte b0;
                 byte b1;
                 byte b2;
                 byte b3;
                 byte b4;
                 byte b5;
                 byte b6;
                 byte b7;
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     b0 = (byte) ((l >> 56) & 0xff);
                     b1 = (byte) ((l >> 48) & 0xff);
                     b2 = (byte) ((l >> 40) & 0xff);
                     b3 = (byte) ((l >> 32) & 0xff);
                     b4 = (byte) ((l >> 24) & 0xff);
                     b5 = (byte) ((l >> 16) & 0xff);
                     b6 = (byte) ((l >> 8) & 0xff);
                     b7 = (byte) ((l >> 0) & 0xff);
                 } else {
                     b0 = (byte) ((l >> 0) & 0xff);
                     b1 = (byte) ((l >> 8) & 0xff);
                     b2 = (byte) ((l >> 16) & 0xff);
                     b3 = (byte) ((l >> 24) & 0xff);
                     b4 = (byte) ((l >> 32) & 0xff);
                     b5 = (byte) ((l >> 40) & 0xff);
                     b6 = (byte) ((l >> 48) & 0xff);
                     b7 = (byte) ((l >> 56) & 0xff);
                 }
                 put(b0);
                 put(b1);
                 put(b2);
                 put(b3);
                 put(b4);
                 put(b5);
                 put(b6);
                 put(b7);
             }
         }
 
         /**
          * @inheritDoc
          */
         public float getFloat() {
             prepareForAccess(4);
             if (componentCursor.getRemaining() >= 4) {
                 float f = componentCursor.getFloat();
                 index += 4;
                 return f;
             } else {
                 int i = getInt();
                 return Float.intBitsToFloat(i);
             }
         }
 
         /**
          * @inheritDoc
          */
         public void putFloat(float f) {
             prepareForAccess(4);
             if (componentCursor.getRemaining() >= 4) {
                 componentCursor.putFloat(f);
                 index += 4;
             } else {
                 int i = Float.floatToIntBits(f);
                 putInt(i);
             }
         }
 
         /**
          * @inheritDoc
          */
         public double getDouble() {
             prepareForAccess(8);
             if (componentCursor.getRemaining() >= 4) {
                 double d = componentCursor.getDouble();
                 index += 8;
                 return d;
             } else {
                 long l = getLong();
                 return Double.longBitsToDouble(l);
             }
         }
 
         /**
          * @inheritDoc
          */
         public void putDouble(double d) {
             prepareForAccess(8);
             if (componentCursor.getRemaining() >= 4) {
                 componentCursor.putDouble(d);
                 index += 8;
             } else {
                 long l = Double.doubleToLongBits(d);
                 putLong(l);
             }
         }
 
         /**
          * @inheritDoc
          */
         public char getChar() {
             prepareForAccess(2);
             if (componentCursor.getRemaining() >= 4) {
                 char c = componentCursor.getChar();
                 index += 2;
                 return c;
             } else {
                 byte b0 = get();
                 byte b1 = get();
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     return (char) ((b0 << 8) | (b1 << 0));
                 } else {
                     return (char) ((b1 << 8) | (b0 << 0));
                 }
             }
         }
 
         /**
          * @inheritDoc
          */
         public void putChar(char c) {
             prepareForAccess(2);
             if (componentCursor.getRemaining() >= 4) {
                 componentCursor.putChar(c);
                 index += 2;
             } else {
                 byte b0;
                 byte b1;
                 if (order.equals(ByteOrder.BIG_ENDIAN)) {
                     b0 = (byte) ((c >> 8) & 0xff);
                     b1 = (byte) ((c >> 0) & 0xff);
                 } else {
                     b0 = (byte) ((c >> 0) & 0xff);
                     b1 = (byte) ((c >> 8) & 0xff);
                 }
                 put(b0);
                 put(b1);
             }
         }
 
     }
 }