/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. 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.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.parser.util;
/**
* @author mycat
*/
public final class PairUtil {
private static final int DEFAULT_INDEX = -1;
/**
* "2" -> (0,2)<br/>
* "1:2" -> (1,2)<br/>
* "1:" -> (1,0)<br/>
* "-1:" -> (-1,0)<br/>
* ":-1" -> (0,-1)<br/>
* ":" -> (0,0)<br/>
*/
public static Pair<Integer, Integer> sequenceSlicing(String slice) {
int ind = slice.indexOf(':');
if (ind < 0) {
int i = Integer.parseInt(slice.trim());
if (i >= 0) {
return new Pair<Integer, Integer>(0, i);
} else {
return new Pair<Integer, Integer>(i, 0);
}
}
String left = slice.substring(0, ind).trim();
String right = slice.substring(1 + ind).trim();
int start, end;
if (left.length() <= 0) {
start = 0;
} else {
start = Integer.parseInt(left);
}
if (right.length() <= 0) {
end = 0;
} else {
end = Integer.parseInt(right);
}
return new Pair<Integer, Integer>(start, end);
}
/**
* <pre>
* 将名字和索引用进行分割 当src = "offer_group[4]", l='[', r=']'时，
* 返回的Piar<String,Integer>("offer", 4);
* 当src = "offer_group", l='[', r=']'时，
* 返回Pair<String, Integer>("offer",-1);
* </pre>
*/
public static Pair<String, Integer> splitIndex(String src, char l, char r) {
if (src == null) {
return null;
}
int length = src.length();
if (length == 0) {
return new Pair<String, Integer>("", DEFAULT_INDEX);
}
if (src.charAt(length - 1) != r) {
return new Pair<String, Integer>(src, DEFAULT_INDEX);
}
int offset = src.lastIndexOf(l);
if (offset == -1) {
return new Pair<String, Integer>(src, DEFAULT_INDEX);
}
int index = DEFAULT_INDEX;
try {
index = Integer.parseInt(src.substring(offset + 1, length - 1));
} catch (NumberFormatException e) {
return new Pair<String, Integer>(src, DEFAULT_INDEX);
}
return new Pair<String, Integer>(src.substring(0, offset), index);
}
}