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/*
 * 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.xs;

import javax.xml.datatype.DatatypeConstants;
import javax.xml.datatype.XMLGregorianCalendar;

import org.apache.xerces.impl.dv.InvalidDatatypeValueException;
import org.apache.xerces.impl.dv.ValidationContext;

/**
 * Validator for <gYear> datatype (W3C Schema Datatypes)
 *
 * @xerces.internal 
 *
 * @author Elena Litani
 * @author Gopal Sharma, SUN Microsystem Inc.
 *
 * @version $Id: YearDV.java 937741 2010-04-25 04:25:46Z mrglavas $
 */

public class YearDV extends AbstractDateTimeDV {

    /**
     * Convert a string to a compiled form
     *
     * @param  content The lexical representation of time
     * @return a valid and normalized time object
     */
    public Object getActualValue(String content, ValidationContext context) throws InvalidDatatypeValueException{
        try{
            return parse(content);
        } catch(Exception ex){
            throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object[]{content, "gYear"});
        }
    }

    /**
     * Parses, validates and computes normalized version of gYear object
     *
     * @param str    The lexical representation of year object CCYY
     *               with possible time zone Z or (-),(+)hh:mm
     * @return normalized date representation
     * @exception SchemaDateTimeException Invalid lexical representation
     */
    protected DateTimeData parse(String str) throws SchemaDateTimeException{
        DateTimeData date = new DateTimeData(str, this);
        int len = str.length();

        // check for preceding '-' sign
        int start = 0;
        if (str.charAt(0)=='-') {
            start = 1;
        }
        int sign = findUTCSign(str, start, len);
        
        final int length = ((sign == -1) ? len : sign) - start;
        if (length < 4) {
            throw new RuntimeException("Year must have 'CCYY' format");
        }
        else if (length > 4 && str.charAt(start) == '0') {
            throw new RuntimeException("Leading zeros are required if the year value would otherwise have fewer than four digits; otherwise they are forbidden");
        }
        
        if (sign == -1) {
            date.year=parseIntYear(str, len);
        }
        else {
            date.year=parseIntYear(str, sign);
            getTimeZone (str, date, sign, len);
        }

        //initialize values
        date.month=MONTH;
        date.day=1;

        //validate and normalize
        validateDateTime(date);

        //save unnormalized values
        saveUnnormalized(date);
        
        if ( date.utc!=0 && date.utc!='Z' ) {
            normalize(date);
        }
        date.position = 0;
        return date;
    }

    /**
     * Converts year object representation to String
     *
     * @param date   year object
     * @return lexical representation of month: CCYY with optional time zone sign
     */
    protected String dateToString(DateTimeData date) {
        StringBuffer message = new StringBuffer(5);
        append(message, date.year, 4);
        append(message, (char)date.utc, 0);
        return message.toString();
    }
    
    protected XMLGregorianCalendar getXMLGregorianCalendar(DateTimeData date) {
        return datatypeFactory.newXMLGregorianCalendar(date.unNormYear, DatatypeConstants.FIELD_UNDEFINED, 
                DatatypeConstants.FIELD_UNDEFINED, DatatypeConstants.FIELD_UNDEFINED, DatatypeConstants.FIELD_UNDEFINED, 
                DatatypeConstants.FIELD_UNDEFINED, DatatypeConstants.FIELD_UNDEFINED, 
                date.hasTimeZone() ? date.timezoneHr * 60 + date.timezoneMin : DatatypeConstants.FIELD_UNDEFINED);
    }
}