com.twelvemonkeys.util.regex.RegExTokenIterator Maven / Gradle / Ivy
/*
* Copyright (c) 2008, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.util.regex;
import com.twelvemonkeys.util.AbstractTokenIterator;
import java.util.NoSuchElementException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* {@code StringTokenizer} replacement, that uses regular expressions to split
* strings into tokens.
*
*@see java.util.regex.Pattern for pattern syntax.
*
* @author Harald Kuhr
* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/util/regex/RegExTokenIterator.java#1 $
*/
public class RegExTokenIterator extends AbstractTokenIterator {
private final Matcher matcher;
private boolean next = false;
/**
* Creates a {@code RegExTokenIterator}.
* Default pettern is {@code "\S+"}.
*
* @param pString the string to be parsed.
*
* @throws IllegalArgumentException if {@code pString} is {@code null}
*/
public RegExTokenIterator(String pString) {
this(pString, "\\S+");
}
/**
* Creates a {@code RegExTokenIterator}.
*
* @see Pattern for pattern syntax.
*
* @param pString the string to be parsed.
* @param pPattern the pattern
*
* @throws PatternSyntaxException if {@code pPattern} is not a valid pattern
* @throws IllegalArgumentException if any of the arguments are {@code null}
*/
public RegExTokenIterator(String pString, String pPattern) {
if (pString == null) {
throw new IllegalArgumentException("string == null");
}
if (pPattern == null) {
throw new IllegalArgumentException("pattern == null");
}
matcher = Pattern.compile(pPattern).matcher(pString);
}
/**
* Resets this iterator.
*
*/
public void reset() {
matcher.reset();
}
public boolean hasNext() {
return next || (next = matcher.find());
}
public String next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
next = false;
return matcher.group();
}
}