org.globus.util.QuotedStringTokenizer Maven / Gradle / Ivy

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/*
 * Copyright 1999-2010 University of Chicago
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied.
 *
 * See the License for the specific language governing permissions and limitations under the License.
 */
package org.globus.util;

import java.util.Enumeration;

/*
 * This class is not thread safe.
 */
public class QuotedStringTokenizer implements Enumeration {
    
    private int limit;
    private int start;
    private String str;

    public QuotedStringTokenizer(String str) {
	this.str = str;
	start = 0;
	limit = str.length();
    }

    public Object nextElement() {
	return nextToken();
    }

    public String nextToken() {
	while ((start < limit) && Character.isWhitespace(str.charAt(start))) {
	    start++;	// eliminate leading whitespace
	}

	if (start == limit) return null;

	StringBuffer buf = new StringBuffer(limit-start);
	char ch;
	char quote = str.charAt(start);
	if (quote == '"' || quote == '\'') {
	    start++;
	    for (int i=start;i