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DataQueue.java

/*
 * %W% %E%
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
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 * Copyright (c) 2003 Sun Microsystems, Inc.  All Rights Reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * - Redistribution of source code must retain the above copyright notice,
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package net.java.games.input;

/**
 * @author elias
 * @version 1.0
 */
00045 final class DataQueue {
      private final Object[] elements;
      private int position;
      private int limit;

      public DataQueue(int size, Class element_type) {
            this.elements= new Object[size];
            for (int i = 0; i < elements.length; i++) {
                  try {
                        elements[i] = element_type.newInstance();
                  } catch (InstantiationException e) {
                        throw new RuntimeException(e);
                  } catch (IllegalAccessException e) {
                        throw new RuntimeException(e);
                  }
            }
            clear();
      }

      public final void clear() {
            position = 0;
            limit = elements.length;
      }

      public final int position() {
            return position;
      }

      public final int limit() {
            return limit;
      }

      public final Object get(int index) {
            assert index < limit;
            return elements[index];
      }

      public final Object get() {
            if (!hasRemaining())
                  return null;
            return get(position++);
      }

      public final void compact() {
            int index = 0;
            while (hasRemaining()) {
                  swap(position, index);
                  position++;
                  index++;
            }
            position = index;
            limit = elements.length;
      }

      private final void swap(int index1, int index2) {
            Object temp = elements[index1];
            elements[index1] = elements[index2];
            elements[index2] = temp;
      }

      public final void flip() {
            limit = position;
            position = 0;
      }

      public final boolean hasRemaining() {
            return remaining() > 0;
      }

      public final int remaining() {
            return limit - position;
      }

      public final void position(int position) {
            this.position = position;
      }

      public final Object[] getElements() {
            return elements;
      }
}

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