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/* |
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* |
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* Copyright 2014, Armenak Grigoryan, and individual contributors as indicated |
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* by the @authors tag. See the copyright.txt in the distribution for a |
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* full listing of individual contributors. |
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* |
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* This is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU Lesser General Public License as |
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* published by the Free Software Foundation; either version 2.1 of |
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* the License, or (at your option) any later version. |
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* |
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* This software is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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*/ |
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package com.strider.datadefender.utils; |
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import java.util.Locale; |
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import java.util.regex.Pattern; |
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/** |
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* Simple matcher to mimic SQL LIKE queries. |
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* |
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* At the moment only "%", "_" and "?" are supported. |
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* |
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* @author Zaahid Bateson |
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*/ |
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public class LikeMatcher { |
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final private String regex; |
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/** |
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* Initializes a LikeMatcher with the given pattern. |
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* |
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* @param pattern the LIKE query pattern |
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*/ |
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public LikeMatcher(final String pattern) { |
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// splitting on '?', '_', and '%' with look-behind and look-ahead so they're included in the split array |
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final String[] parts = pattern.split("((?<=[\\?\\_\\%])|(?=[\\?\\_\\%]))"); |
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final StringBuilder reg = new StringBuilder("^"); |
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for (final String part : parts) { |
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if ("%".equals(part)) { |
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reg.append(".*?"); |
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} else if ("?".equals(part) || "_".equals(part)) { |
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reg.append('.'); |
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} else { |
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reg.append(Pattern.quote(part.toLowerCase(Locale.ENGLISH))); |
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} |
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} |
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reg.append('$'); |
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this.regex = reg.toString(); |
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} |
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/** |
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* Returns true if the given string matches the Like pattern. |
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* |
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* @param str the string to test against |
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* @return |
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*/ |
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public boolean matches(final String str) { |
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return str.toLowerCase(Locale.ENGLISH).matches(regex); |
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} |
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} |
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//~ Formatted by Jindent --- http://www.jindent.com |
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armenak /
DataDefender
