/*
* The MIT License (MIT)
*
* Copyright (c) 2016 Lachlan Dowding
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package permafrost.tundra.util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.regex.Pattern;
/**
* A collection of convenience methods for working regular expressions.
*/
public final class RegularExpressionHelper {
/**
* Disallow instantiation of this class.
*/
private RegularExpressionHelper() {}
/**
* Compiles a given regular expression pattern.
*
* @param pattern The pattern to compile.
* @return The compiled pattern.
*/
public static Pattern compile(String pattern) {
if (pattern == null) return null;
return Pattern.compile(pattern);
}
/**
* Compiles a list of regular expression patterns.
*
* @param patterns The patterns to compile.
* @return The compiled patterns.
*/
public static Collection<Pattern> compile(Collection<String> patterns) {
if (patterns == null) return null;
List<Pattern> compiledPatterns = new ArrayList<Pattern>(patterns.size());
for (String pattern : patterns) {
if (pattern != null) compiledPatterns.add(compile(pattern));
}
return compiledPatterns;
}
/**
* Compiles a list of regular expression patterns.
*
* @param patterns The patterns to compile.
* @return The compiled patterns.
*/
public static Pattern[] compile(String ...patterns) {
if (patterns == null) return null;
Collection<Pattern> compiledPatterns = compile(Arrays.asList(patterns));
return compiledPatterns.toArray(new Pattern[compiledPatterns.size()]);
}
}