| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.data.std.primitive; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits; |
| import edu.uci.ics.hyracks.data.std.api.AbstractPointable; |
| import edu.uci.ics.hyracks.data.std.api.IComparable; |
| import edu.uci.ics.hyracks.data.std.api.IHashable; |
| import edu.uci.ics.hyracks.data.std.api.INumeric; |
| import edu.uci.ics.hyracks.data.std.api.IPointable; |
| import edu.uci.ics.hyracks.data.std.api.IPointableFactory; |
| |
| public final class DoublePointable extends AbstractPointable implements IHashable, IComparable, INumeric { |
| private final static double machineEpsilon; |
| static { |
| float epsilon = 1.0f; |
| |
| do { |
| epsilon /= 2.0f; |
| } |
| while ((float)(1.0 + (epsilon/2.0)) != 1.0); |
| machineEpsilon = epsilon; |
| } |
| |
| public static final ITypeTraits TYPE_TRAITS = new ITypeTraits() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public boolean isFixedLength() { |
| return true; |
| } |
| |
| @Override |
| public int getFixedLength() { |
| return 8; |
| } |
| }; |
| |
| public static final IPointableFactory FACTORY = new IPointableFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public IPointable createPointable() { |
| return new DoublePointable(); |
| } |
| |
| @Override |
| public ITypeTraits getTypeTraits() { |
| return TYPE_TRAITS; |
| } |
| }; |
| |
| public static long getLongBits(byte[] bytes, int start) { |
| return LongPointable.getLong(bytes, start); |
| } |
| |
| public static double getDouble(byte[] bytes, int start) { |
| long bits = getLongBits(bytes, start); |
| return Double.longBitsToDouble(bits); |
| } |
| |
| public static void setDouble(byte[] bytes, int start, double value) { |
| long bits = Double.doubleToLongBits(value); |
| LongPointable.setLong(bytes, start, bits); |
| } |
| |
| public double getDouble() { |
| return getDouble(bytes, start); |
| } |
| |
| public void setDouble(double value) { |
| setDouble(bytes, start, value); |
| } |
| |
| public double preIncrement() { |
| double v = getDouble(); |
| ++v; |
| setDouble(v); |
| return v; |
| } |
| |
| public double postIncrement() { |
| double v = getDouble(); |
| double ov = v++; |
| setDouble(v); |
| return ov; |
| } |
| |
| @Override |
| public int compareTo(IPointable pointer) { |
| return compareTo(pointer.getByteArray(), pointer.getStartOffset(), pointer.getLength()); |
| } |
| |
| @Override |
| public int compareTo(byte[] bytes, int start, int length) { |
| double v = getDouble(); |
| double ov = getDouble(bytes, start); |
| return v < ov ? -1 : (v > ov ? 1 : 0); |
| } |
| |
| @Override |
| public int hash() { |
| long bits = getLongBits(bytes, start); |
| return (int) (bits ^ (bits >>> 32)); |
| } |
| |
| @Override |
| public byte byteValue() { |
| return (byte) getDouble(); |
| } |
| |
| @Override |
| public short shortValue() { |
| return (short) getDouble(); |
| } |
| |
| @Override |
| public int intValue() { |
| return (int) getDouble(); |
| } |
| |
| @Override |
| public long longValue() { |
| return (long) getDouble(); |
| } |
| |
| @Override |
| public float floatValue() { |
| return (float) getDouble(); |
| } |
| |
| @Override |
| public double doubleValue() { |
| return getDouble(); |
| } |
| |
| public static double getEpsilon() { |
| return machineEpsilon; |
| } |
| } |