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+/* Copyright (C) 2000, 2002, 2005  Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package java.awt.image;
+
+/** 
+ * Class that manages arrays of data elements. A data buffer consists
+ * of one or more banks.  A bank is a continuous region of data
+ * elements.
+ *
+ * @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
+ */
+public abstract class DataBuffer
+{
+  /**
+   * A constant representing a data type that uses <code>byte</code> primitives
+   * as the storage unit.
+   */
+  public static final int TYPE_BYTE      =  0;
+
+  /**
+   * A constant representing a data type that uses <code>short</code> 
+   * primitives as the storage unit.
+   */
+  public static final int TYPE_USHORT    =  1;
+
+  /**
+   * A constant representing a data type that uses <code>short</code> 
+   * primitives as the storage unit.
+   */
+  public static final int TYPE_SHORT     =  2;
+
+  /**
+   * A constant representing a data type that uses <code>int</code> 
+   * primitives as the storage unit.
+   */
+  public static final int TYPE_INT       =  3;
+  
+  /**
+   * A constant representing a data type that uses <code>float</code> 
+   * primitives as the storage unit.
+   */
+  public static final int TYPE_FLOAT     =  4;
+
+  /**
+   * A constant representing a data type that uses <code>double</code> 
+   * primitives as the storage unit.
+   */
+  public static final int TYPE_DOUBLE    =  5;
+
+  /**
+   * A constant representing an undefined data type.
+   */
+  public static final int TYPE_UNDEFINED = 32;
+  
+  /** The type of the data elements stored in the data buffer.  */
+  protected int dataType;
+  
+  /** The number of banks in this buffer.  */
+  protected int banks = 1;
+  
+  /** Offset into the default (0'th) bank). */
+  protected int offset; // FIXME: Is offsets[0] always mirrored in offset?
+  
+  /** The size of the banks.  */
+  protected int size;
+  
+  /** Offset into each bank.  */
+  protected int[] offsets;
+  
+  /**
+   * Creates a new <code>DataBuffer</code> with the specified data type and
+   * size.  The <code>dataType</code> should be one of the constants 
+   * {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, {@link #TYPE_USHORT}, 
+   * {@link #TYPE_INT}, {@link #TYPE_FLOAT} and {@link #TYPE_DOUBLE}.
+   * <p>
+   * The physical (array-based) storage is allocated by a subclass.
+   * 
+   * @param dataType the data type.
+   * @param size the number of elements in the buffer.
+   */
+  protected DataBuffer(int dataType, int size)
+  {
+    this.dataType = dataType;
+    this.size = size;
+  }
+
+  /**
+   * Creates a new <code>DataBuffer</code> with the specified data type,
+   * size and number of banks.  The <code>dataType</code> should be one of 
+   * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, 
+   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and 
+   * {@link #TYPE_DOUBLE}.
+   * <p>
+   * The physical (array-based) storage is allocated by a subclass.
+   * 
+   * @param dataType the data type.
+   * @param size the number of elements in the buffer.
+   * @param numBanks the number of data banks.
+   */
+  protected DataBuffer(int dataType, int size, int numBanks) {
+    this(dataType, size);
+    banks = numBanks;
+    offsets = new int[numBanks];
+  }
+
+  /**
+   * Creates a new <code>DataBuffer</code> with the specified data type,
+   * size and number of banks.  An offset (which applies to all banks) is
+   * also specified.  The <code>dataType</code> should be one of 
+   * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, 
+   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and 
+   * {@link #TYPE_DOUBLE}.
+   * <p>
+   * The physical (array-based) storage is allocated by a subclass.
+   * 
+   * @param dataType the data type.
+   * @param size the number of elements in the buffer.
+   * @param numBanks the number of data banks.
+   * @param offset the offset to the first element for all banks.
+   */
+  protected DataBuffer(int dataType, int size, int numBanks, int offset) {
+    this(dataType, size, numBanks);
+    
+    java.util.Arrays.fill(offsets, offset);          
+    
+    this.offset = offset;
+  }
+
+  /**
+   * Creates a new <code>DataBuffer</code> with the specified data type,
+   * size and number of banks.  An offset (which applies to all banks) is
+   * also specified.  The <code>dataType</code> should be one of 
+   * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, 
+   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and 
+   * {@link #TYPE_DOUBLE}.
+   * <p>
+   * The physical (array-based) storage is allocated by a subclass.
+   * 
+   * @param dataType the data type.
+   * @param size the number of elements in the buffer.
+   * @param numBanks the number of data banks.
+   * @param offsets the offsets to the first element for all banks.
+   * 
+   * @throws ArrayIndexOutOfBoundsException if 
+   *         <code>numBanks != offsets.length</code>.
+   */
+  protected DataBuffer(int dataType, int size, int numBanks, int[] offsets) {
+    this(dataType, size);
+    if (numBanks != offsets.length) 
+      throw new ArrayIndexOutOfBoundsException();
+    
+    banks = numBanks;
+    this.offsets = offsets;
+    
+    offset = offsets[0];
+  }
+  
+  /**
+   * Returns the size (number of bits) of the specified data type. Valid types
+   * are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, 
+   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and 
+   * {@link #TYPE_DOUBLE}.
+   * 
+   * @param dataType the data type.
+   * @return The number of bits for the specified data type.
+   * @throws IllegalArgumentException if <code>dataType < 0</code> or 
+   *         <code>dataType > TYPE_DOUBLE</code>.
+   */
+  public static int getDataTypeSize(int dataType) {
+    // Maybe this should be a lookup table instead.
+    switch (dataType)
+      {
+      case TYPE_BYTE:
+	return 8;
+      case TYPE_USHORT:
+      case TYPE_SHORT:
+	return 16;
+      case TYPE_INT:
+      case TYPE_FLOAT:
+	return 32;
+      case TYPE_DOUBLE:
+	return 64;
+      default:
+	throw new IllegalArgumentException();
+      }
+  }
+
+  /**
+   * Returns the type of the data elements in the data buffer.  Valid types
+   * are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, 
+   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and 
+   * {@link #TYPE_DOUBLE}.
+   * 
+   * @return The type.
+   */
+  public int getDataType()
+  {
+    return dataType;
+  }
+  
+  /**
+   * Returns the size of the data buffer.
+   * 
+   * @return The size.
+   */
+  public int getSize()
+  {
+    return size;
+  }
+  
+  /**
+   * Returns the element offset for the first data bank.
+   * 
+   * @return The element offset.
+   */
+  public int getOffset()
+  {
+    return offset;
+  }
+  
+  /**
+   * Returns the offsets for all the data banks used by this 
+   * <code>DataBuffer</code>.
+   * 
+   * @return The offsets.
+   */
+  public int[] getOffsets()
+  {
+    if (offsets == null)
+    {
+      // is this necessary?
+      offsets = new int[1];
+      offsets[0] = offset;
+    }
+    return offsets;
+  }
+
+  /**
+   * Returns the number of data banks for this <code>DataBuffer</code>.
+   * @return The number of data banks.
+   */
+  public int getNumBanks()
+  {
+    return banks;
+  }
+
+  /**
+   * Returns an element from the first data bank.  The offset (specified in
+   * the constructor) is added to <code>i</code> before accessing the 
+   * underlying data array.
+   * 
+   * @param i the element index.
+   * @return The element.
+   */
+  public int getElem(int i)
+  {
+    return getElem(0, i);
+  }
+
+  /**
+   * Returns an element from a particular data bank.  The offset (specified in
+   * the constructor) is added to <code>i</code> before accessing the 
+   * underlying data array.
+   * 
+   * @param bank the bank index.
+   * @param i the element index.
+   * @return The element.
+   */
+  public abstract int getElem(int bank, int i);
+  
+  /**
+   * Sets an element in the first data bank.  The offset (specified in the
+   * constructor) is added to <code>i</code> before updating the underlying
+   * data array.
+   * 
+   * @param i the element index.
+   * @param val the new element value.
+   */
+  public void setElem(int i, int val)
+  {
+    setElem(0, i, val);
+  }
+
+  /**
+   * Sets an element in a particular data bank.  The offset (specified in the
+   * constructor) is added to <code>i</code> before updating the underlying
+   * data array.
+   * 
+   * @param bank the data bank index.
+   * @param i the element index.
+   * @param val the new element value.
+   */
+  public abstract void setElem(int bank, int i, int val);
+  
+  /**
+   * Returns an element from the first data bank, converted to a 
+   * <code>float</code>.  The offset (specified in the constructor) is added 
+   * to <code>i</code> before accessing the underlying data array.
+   * 
+   * @param i the element index.
+   * @return The element.
+   */
+  public float getElemFloat(int i)
+  {
+    return getElem(i);
+  }
+    
+  /**
+   * Returns an element from a particular data bank, converted to a 
+   * <code>float</code>.  The offset (specified in the constructor) is 
+   * added to <code>i</code> before accessing the underlying data array.
+   * 
+   * @param bank the bank index.
+   * @param i the element index.
+   * @return The element.
+   */
+  public float getElemFloat(int bank, int i)
+  {
+    return getElem(bank, i);
+  }
+
+  /**
+   * Sets an element in the first data bank.  The offset (specified in the
+   * constructor) is added to <code>i</code> before updating the underlying
+   * data array. 
+   * 
+   * @param i the element index.
+   * @param val the new element value.
+   */
+  public void setElemFloat(int i, float val)
+  {
+    setElem(i, (int) val);
+  }
+
+  /**
+   * Sets an element in a particular data bank.  The offset (specified in the
+   * constructor) is added to <code>i</code> before updating the underlying
+   * data array.
+   * 
+   * @param bank the data bank index.
+   * @param i the element index.
+   * @param val the new element value.
+   */
+  public void setElemFloat(int bank, int i, float val)
+  {
+    setElem(bank, i, (int) val);
+  }
+
+  /**
+   * Returns an element from the first data bank, converted to a 
+   * <code>double</code>.  The offset (specified in the constructor) is added
+   * to <code>i</code> before accessing the underlying data array.
+   * 
+   * @param i the element index.
+   * @return The element.
+   */
+  public double getElemDouble(int i)
+  {
+    return getElem(i);
+  }
+    
+  /**
+   * Returns an element from a particular data bank, converted to a 
+   * <code>double</code>.  The offset (specified in the constructor) is 
+   * added to <code>i</code> before accessing the underlying data array.
+   * 
+   * @param bank the bank index.
+   * @param i the element index.
+   * @return The element.
+   */
+  public double getElemDouble(int bank, int i)
+  {
+    return getElem(bank, i);
+  }
+
+  /**
+   * Sets an element in the first data bank.  The offset (specified in the
+   * constructor) is added to <code>i</code> before updating the underlying
+   * data array. 
+   * 
+   * @param i the element index.
+   * @param val the new element value.
+   */
+  public void setElemDouble(int i, double val)
+  {
+    setElem(i, (int) val);
+  }
+
+  /**
+   * Sets an element in a particular data bank.  The offset (specified in the
+   * constructor) is added to <code>i</code> before updating the underlying
+   * data array.
+   * 
+   * @param bank the data bank index.
+   * @param i the element index.
+   * @param val the new element value.
+   */
+  public void setElemDouble(int bank, int i, double val)
+  {
+    setElem(bank, i, (int) val);
+  }
+}