ipojo.plugin/src/main/java/org/apache/felix/ipojo/plugin/QuotedTokenizer.java

/* 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.felix.ipojo.plugin;

import java.util.*;

public class QuotedTokenizer {
	String	string;
	int		index				= 0;
	String	separators;
	boolean	returnTokens;
	boolean	ignoreWhiteSpace	= true;
	String	peek;
	char	separator;

	public QuotedTokenizer(String string, String separators, boolean returnTokens ) {
		if ( string == null )
			throw new IllegalArgumentException("string argument must be not null");
		this.string = string;
		this.separators = separators;
		this.returnTokens = returnTokens;
	}
	public QuotedTokenizer(String string, String separators) {
		this(string,separators,false);
	}

	public String nextToken(String separators) {
		separator = 0;
		if ( peek != null ) {
			String tmp = peek;
			peek = null;
			return tmp;
		}
		
		if ( index == string.length())
			return null;
		
		StringBuffer sb = new StringBuffer();

		while (index < string.length()) {
			char c = string.charAt(index++);

			if ( Character.isWhitespace(c)) {
				if ( index == string.length())
					break;
				else
					continue;
			}
			
			if (separators.indexOf(c) >= 0) {
				if (returnTokens)
					peek = Character.toString(c);
				else
					separator = c;
				break;
			}

			switch (c) {
				case '"' :
				case '\'' :
					quotedString(sb, c);
					break;

				default :
					sb.append(c);
			}
		}
		String result = sb.toString().trim();
		if ( result.length()==0 && index==string.length())
			return null;
		return result;
	}

	public String nextToken() {
		return nextToken(separators);
	}

	private void quotedString(StringBuffer sb, char c) {
		char quote = c;
		while (index < string.length()) {
			c = string.charAt(index++);
			if (c == quote)
				break;
			if (c == '\\' && index < string.length()
					&& string.charAt(index + 1) == quote)
				c = string.charAt(index++);
			sb.append(c);
		}
	}

	public String[] getTokens() {
		return getTokens(0);
	}

	private String [] getTokens(int cnt){
		String token = nextToken();
		if ( token == null ) 
			return new String[cnt];
		
		String result[] = getTokens(cnt+1);
		result[cnt]=token;
		return result;
	}

	public char getSeparator() { return separator; }
	
	public List getTokenSet() {
		List list = new ArrayList();
		String token = nextToken();
		while ( token != null ) {
			list.add(token);
			token = nextToken();
		}
		return list;
	}
}