/*
 * 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.xerces.impl.dv.dtd;

import org.apache.xerces.impl.dv.*;
import java.util.StringTokenizer;

/**
 * For list types: ENTITIES, IDREFS, NMTOKENS.
 * 
 * @xerces.internal
 * 
 * @author Jeffrey Rodriguez, IBM
 * @author Sandy Gao, IBM
 * 
 * @version $Id: ListDatatypeValidator.java 572061 2007-09-02 18:05:06Z mrglavas $
 */
public class ListDatatypeValidator implements DatatypeValidator {

    // the type of items in the list
    final DatatypeValidator fItemValidator;

    // construct a list datatype validator
    public ListDatatypeValidator(DatatypeValidator itemDV) {
        fItemValidator = itemDV;
    }

    /**
     * Checks that "content" string is valid.
     * If invalid a Datatype validation exception is thrown.
     * 
     * @param content       the string value that needs to be validated
     * @param context       the validation context
     * @throws InvalidDatatypeException if the content is
     *         invalid according to the rules for the validators
     * @see InvalidDatatypeValueException
     */
    public void validate(String content, ValidationContext context) throws InvalidDatatypeValueException {

        StringTokenizer parsedList = new StringTokenizer(content," ");
        int numberOfTokens =  parsedList.countTokens();
        if (numberOfTokens == 0) {
            throw new InvalidDatatypeValueException("EmptyList", null);
        }
        //Check each token in list against base type
        while (parsedList.hasMoreTokens()) {
            this.fItemValidator.validate(parsedList.nextToken(), context);
        }
    }

}