/*
* Copyright (c) 2003-onwards Shaven Puppy Ltd
* 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 'Shaven Puppy' 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 OWNER 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.shavenpuppy.jglib.util;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* Even more improved string tokenizer, with delimiters
*/
public class MoreImprovedStringTokenizer implements Iterator<String> {
private final String input;
private final String delimiter;
private int index;
private final StringBuilder token;
/**
* ImprovedStringTokenizer constructor comment.
*/
public MoreImprovedStringTokenizer(String input, String delimiter) {
this.input = input;
this.delimiter = delimiter;
token = new StringBuilder(input.length());
}
/**
* Returns <tt>true</tt> if the iteration has more elements. (In other words, returns <tt>true</tt> if <tt>next</tt> would
* return an element rather than throwing an exception.)
*
* @return <tt>true</tt> if the iterator has more elements.
*/
public boolean hasMoreTokens() {
return index < input.length();
}
/**
* Returns <tt>true</tt> if the iteration has more elements. (In other words, returns <tt>true</tt> if <tt>next</tt> would
* return an element rather than throwing an exception.)
*
* @return <tt>true</tt> if the iterator has more elements.
*/
@Override
public boolean hasNext() {
return hasMoreTokens();
}
/**
* Returns the next element in the interation.
*
* @returns the next element in the interation.
* @exception NoSuchElementException iteration has no more elements.
*/
@Override
public String next() {
return nextToken();
}
/**
* Returns the next token.
*/
public String nextToken() {
if (!hasMoreTokens()) {
throw new NoSuchElementException();
}
// Add characters until we come to more whitespace
char c;
boolean inquotes = false;
token.setLength(0);
while (index < input.length()) {
c = input.charAt(index ++);
if (inquotes) {
if (c == '"') {
inquotes = false;
} else {
token.append(c);
}
} else {
if (c == '"') {
inquotes = true;
} else if (delimiter.indexOf(c) != -1) {
// Hit a delimiter
return token.toString();
} else {
token.append(c);
}
}
}
return token.toString();
}
/**
* Removes from the underlying collection the last element returned by the iterator (optional operation). This method can be
* called only once per call to <tt>next</tt>. The behavior of an iterator is unspecified if the underlying collection is
* modified while the iteration is in progress in any way other than by calling this method.
*
* @exception UnsupportedOperationException if the <tt>remove</tt> operation is not supported by this Iterator.
* @exception IllegalStateException if the <tt>next</tt> method has not yet been called, or the <tt>remove</tt> method has
* already been called after the last call to the <tt>next</tt> method.
*/
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}