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Common Lisp implementation running on the JVM
/*
* BasicVector_UnsignedByte8.java
*
* Copyright (C) 2002-2006 Peter Graves
* $Id$
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* 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 org.armedbear.lisp;
import static org.armedbear.lisp.Lisp.*;
// A basic vector is a specialized vector that is not displaced to another
// array, has no fill pointer, and is not expressly adjustable.
public final class BasicVector_UnsignedByte8 extends AbstractVector
{
private int capacity;
private byte[] elements;
public BasicVector_UnsignedByte8(int capacity)
{
elements = new byte[capacity];
this.capacity = capacity;
}
public BasicVector_UnsignedByte8(byte[] array)
{
capacity = array.length;
elements = new byte[capacity];
System.arraycopy(array, 0, elements, 0, capacity);
}
public BasicVector_UnsignedByte8(LispObject[] array)
{
capacity = array.length;
elements = new byte[capacity];
for (int i = array.length; i-- > 0;)
elements[i] = coerceLispObjectToJavaByte(array[i]);
}
@Override
public LispObject typeOf()
{
return list(Symbol.SIMPLE_ARRAY, UNSIGNED_BYTE_8, new Cons(Fixnum.getInstance(capacity)));
}
@Override
public LispObject classOf()
{
return BuiltInClass.VECTOR;
}
@Override
public LispObject typep(LispObject type)
{
if (type == Symbol.SIMPLE_ARRAY)
return T;
if (type == BuiltInClass.SIMPLE_ARRAY)
return T;
return super.typep(type);
}
@Override
public LispObject getElementType()
{
return UNSIGNED_BYTE_8;
}
@Override
public boolean isSimpleVector()
{
return false;
}
@Override
public boolean hasFillPointer()
{
return false;
}
@Override
public boolean isAdjustable()
{
return false;
}
@Override
public int capacity()
{
return capacity;
}
@Override
public int length()
{
return capacity;
}
@Override
public LispObject elt(int index)
{
try
{
return coerceJavaByteToLispObject(elements[index]);
}
catch (ArrayIndexOutOfBoundsException e)
{
badIndex(index, capacity);
return NIL; // Not reached.
}
}
@Override
public int aref(int index)
{
try
{
return (((int)elements[index]) & 0xff);
}
catch (ArrayIndexOutOfBoundsException e)
{
badIndex(index, elements.length);
// Not reached.
return 0;
}
}
@Override
public LispObject AREF(int index)
{
try
{
return coerceJavaByteToLispObject(elements[index]);
}
catch (ArrayIndexOutOfBoundsException e)
{
badIndex(index, elements.length);
return NIL; // Not reached.
}
}
@Override
public void aset(int index, int n)
{
try
{
elements[index] = (byte) n;
}
catch (ArrayIndexOutOfBoundsException e)
{
badIndex(index, capacity);
}
}
@Override
public void aset(int index, LispObject value)
{
try
{
elements[index] = coerceLispObjectToJavaByte(value);
}
catch (ArrayIndexOutOfBoundsException e)
{
badIndex(index, capacity);
}
}
@Override
public LispObject subseq(int start, int end)
{
BasicVector_UnsignedByte8 v = new BasicVector_UnsignedByte8(end - start);
int i = start, j = 0;
try
{
while (i < end)
v.elements[j++] = elements[i++];
return v;
}
catch (ArrayIndexOutOfBoundsException e)
{
return error(new TypeError("Array index out of bounds: " + i + "."));
}
}
@Override
public void fill(LispObject obj)
{
if (!(obj instanceof Fixnum)) {
type_error(obj, Symbol.FIXNUM);
// Not reached.
return;
}
int n = ((Fixnum) obj).value;
if (n < 0 || n > 255) {
type_error(obj, UNSIGNED_BYTE_8);
// Not reached.
return;
}
for (int i = capacity; i-- > 0;)
elements[i] = (byte) n;
}
@Override
public void shrink(int n)
{
if (n < capacity)
{
byte[] newArray = new byte[n];
System.arraycopy(elements, 0, newArray, 0, n);
elements = newArray;
capacity = n;
return;
}
if (n == capacity)
return;
error(new LispError());
}
@Override
public LispObject reverse()
{
BasicVector_UnsignedByte8 result = new BasicVector_UnsignedByte8(capacity);
int i, j;
for (i = 0, j = capacity - 1; i < capacity; i++, j--)
result.elements[i] = elements[j];
return result;
}
@Override
public LispObject nreverse()
{
int i = 0;
int j = capacity - 1;
while (i < j)
{
byte temp = elements[i];
elements[i] = elements[j];
elements[j] = temp;
++i;
--j;
}
return this;
}
@Override
public AbstractVector adjustArray(int newCapacity,
LispObject initialElement,
LispObject initialContents)
{
if (initialContents != null)
{
LispObject[] newElements = new LispObject[newCapacity];
if (initialContents.listp())
{
LispObject list = initialContents;
for (int i = 0; i < newCapacity; i++)
{
newElements[i] = list.car();
list = list.cdr();
}
}
else if (initialContents.vectorp())
{
for (int i = 0; i < newCapacity; i++)
newElements[i] = initialContents.elt(i);
}
else
type_error(initialContents, Symbol.SEQUENCE);
return new BasicVector_UnsignedByte8(newElements);
}
if (capacity != newCapacity)
{
byte[] newElements = new byte[newCapacity];
System.arraycopy(elements, 0, newElements, 0,
Math.min(capacity, newCapacity));
if (initialElement != null) {
byte initValue = (byte)(initialElement.intValue() & 0xFF);
for (int i = capacity; i < newCapacity; i++)
newElements[i] = initValue;
}
return new BasicVector_UnsignedByte8(newElements);
}
// No change.
return this;
}
@Override
public AbstractVector adjustArray(int newCapacity,
AbstractArray displacedTo,
int displacement)
{
return new ComplexVector(newCapacity, displacedTo, displacement);
}
}