/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 at
*
* 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 org.apache.solr.util;
import org.apache.lucene.util.BytesRef;
/**
* @version $Id: NumberUtils.java 951104 2010-06-03 18:38:05Z mikemccand $
*/
public class NumberUtils {
public static String int2sortableStr(int val) {
char[] arr = new char[3];
int2sortableStr(val,arr,0);
return new String(arr,0,3);
}
public static String int2sortableStr(String val) {
return int2sortableStr(Integer.parseInt(val));
}
public static String SortableStr2int(String val) {
int ival = SortableStr2int(val,0,3);
return Integer.toString(ival);
}
public static String SortableStr2int(BytesRef val) {
// TODO: operate directly on BytesRef
return SortableStr2int(val.utf8ToString());
}
public static String long2sortableStr(long val) {
char[] arr = new char[5];
long2sortableStr(val,arr,0);
return new String(arr,0,5);
}
public static String long2sortableStr(String val) {
return long2sortableStr(Long.parseLong(val));
}
public static String SortableStr2long(String val) {
long ival = SortableStr2long(val,0,5);
return Long.toString(ival);
}
public static String SortableStr2long(BytesRef val) {
// TODO: operate directly on BytesRef
return SortableStr2long(val.utf8ToString());
}
//
// IEEE floating point format is defined so that it sorts correctly
// when interpreted as a signed integer (or signed long in the case
// of a double) for positive values. For negative values, all the bits except
// the sign bit must be inverted.
// This correctly handles all possible float values including -Infinity and +Infinity.
// Note that in float-space, NaN<x is false, NaN>x is false, NaN==x is false, NaN!=x is true
// for all x (including NaN itself). Internal to Solr, NaN==NaN is true and NaN
// sorts higher than Infinity, so a range query of [-Infinity TO +Infinity] will
// exclude NaN values, but a query of "NaN" will find all NaN values.
// Also, -0==0 in float-space but -0<0 after this transformation.
//
public static String float2sortableStr(float val) {
int f = Float.floatToRawIntBits(val);
if (f<0) f ^= 0x7fffffff;
return int2sortableStr(f);
}
public static String float2sortableStr(String val) {
return float2sortableStr(Float.parseFloat(val));
}
public static float SortableStr2float(String val) {
int f = SortableStr2int(val,0,3);
if (f<0) f ^= 0x7fffffff;
return Float.intBitsToFloat(f);
}
public static float SortableStr2float(BytesRef val) {
// TODO: operate directly on BytesRef
return SortableStr2float(val.utf8ToString());
}
public static String SortableStr2floatStr(String val) {
return Float.toString(SortableStr2float(val));
}
public static String double2sortableStr(double val) {
long f = Double.doubleToRawLongBits(val);
if (f<0) f ^= 0x7fffffffffffffffL;
return long2sortableStr(f);
}
public static String double2sortableStr(String val) {
return double2sortableStr(Double.parseDouble(val));
}
public static double SortableStr2double(String val) {
long f = SortableStr2long(val,0,6);
if (f<0) f ^= 0x7fffffffffffffffL;
return Double.longBitsToDouble(f);
}
public static double SortableStr2double(BytesRef val) {
// TODO: operate directly on BytesRef
return SortableStr2double(val.utf8ToString());
}
public static String SortableStr2doubleStr(String val) {
return Double.toString(SortableStr2double(val));
}
// uses binary representation of an int to build a string of
// chars that will sort correctly. Only char ranges
// less than 0xd800 will be used to avoid UCS-16 surrogates.
public static int int2sortableStr(int val, char[] out, int offset) {
val += Integer.MIN_VALUE;
out[offset++] = (char)(val >>> 24);
out[offset++] = (char)((val >>> 12) & 0x0fff);
out[offset++] = (char)(val & 0x0fff);
return 3;
}
public static int SortableStr2int(String sval, int offset, int len) {
int val = sval.charAt(offset++) << 24;
val |= sval.charAt(offset++) << 12;
val |= sval.charAt(offset++);
val -= Integer.MIN_VALUE;
return val;
}
public static int SortableStr2int(BytesRef sval, int offset, int len) {
// TODO: operate directly on BytesRef
return SortableStr2int(sval.utf8ToString(), offset, len);
}
// uses binary representation of an int to build a string of
// chars that will sort correctly. Only char ranges
// less than 0xd800 will be used to avoid UCS-16 surrogates.
// we can use the lowest 15 bits of a char, (or a mask of 0x7fff)
public static int long2sortableStr(long val, char[] out, int offset) {
val += Long.MIN_VALUE;
out[offset++] = (char)(val >>>60);
out[offset++] = (char)(val >>>45 & 0x7fff);
out[offset++] = (char)(val >>>30 & 0x7fff);
out[offset++] = (char)(val >>>15 & 0x7fff);
out[offset] = (char)(val & 0x7fff);
return 5;
}
public static long SortableStr2long(String sval, int offset, int len) {
long val = (long)(sval.charAt(offset++)) << 60;
val |= ((long)sval.charAt(offset++)) << 45;
val |= ((long)sval.charAt(offset++)) << 30;
val |= sval.charAt(offset++) << 15;
val |= sval.charAt(offset);
val -= Long.MIN_VALUE;
return val;
}
public static long SortableStr2long(BytesRef sval, int offset, int len) {
// TODO: operate directly on BytesRef
return SortableStr2long(sval.utf8ToString(), offset, len);
}
}