/*
* 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.exoplatform.services.jcr.impl.core.query.lucene;
/**
*/
public class LongField {
private static final int STRING_LONG_LEN
= Long.toString(Long.MAX_VALUE, Character.MAX_RADIX).length() + 1;
private LongField() {
}
public static String longToString(long value) {
StringBuilder sb = new StringBuilder(STRING_LONG_LEN);
if (value < 0) {
// shift value
value += Long.MAX_VALUE;
value++;
// after shift
// Long.MIN_VALUE -> 0
// 1 -> Long.MAX_VALUE
// convert into string
String s = Long.toString(value, Character.MAX_RADIX);
// pad with leading zeros
while ((sb.length() + s.length()) < STRING_LONG_LEN) {
sb.append('0');
}
sb.append(s);
} else {
// convert into string
String s = Long.toString(value, Character.MAX_RADIX);
// mark as positive
sb.append('1');
// fill in zeros if needed
while ((sb.length() + s.length()) < STRING_LONG_LEN) {
sb.append('0');
}
sb.append(s);
}
return sb.toString();
}
public static long stringToLong(String value) {
if (value.charAt(0) == '1') {
// positive
return Long.parseLong(value.substring(1), Character.MAX_RADIX);
}
if (value.charAt(0) == '0') {
// negative
long longValue = Long.parseLong(value, Character.MAX_RADIX);
// reverse shift
longValue -= Long.MAX_VALUE;
return --longValue;
} else {
throw new IllegalArgumentException(value);
}
}
}