/*
* Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package org.visage.runtime.sequence;
import org.visage.runtime.TypeInfo;
/**
* Special case implementation for sequences that are ranges of floating point, such as [1.0 .. 2.0 BY .1].
* Range sequences should be constructed with the Sequences.range() factory method rather than with the
* NumberRangeSequence constructor. Unlike integer range sequences, the step is required.
* O(1) space and time construction costs.
*
* @author Brian Goetz
*/
class NumberRangeSequence extends AbstractSequence<Float> implements Sequence<Float> {
private final float start, step;
private final int size;
public NumberRangeSequence(float start, float bound, float step, boolean exclusive) {
super(TypeInfo.Float);
if (step == 0.0f)
throw new IllegalArgumentException("Range step of zero");
this.start = start;
this.step = step;
this.size = Sequences.calculateFloatRangeSize(start, bound, step, exclusive);
}
public NumberRangeSequence(float start, float bound, float step) {
this(start, bound, step, false);
}
@Override
public int size() {
return size;
}
@Override
public Float get(int position) {
if (position < 0 || position >= size)
return 0.0f;
else
return (start + position * step);
}
@Override
public float getAsFloat(int position) {
if (position < 0 || position >= size)
return 0.0f;
else
return (start + position * step);
}
@Override
public void toArray(int sourceOffset, int length, Object[] dest, int destOffset) {
if (sourceOffset < 0 || (length > 0 && sourceOffset + length > size))
throw new ArrayIndexOutOfBoundsException();
int index = destOffset;
for (float value = start + sourceOffset*step; index < destOffset+length; value += step, index++)
dest[index] = value;
}
}