/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * 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.apache.axis.encoding.ser;

import org.apache.axis.utils.Messages;

import javax.xml.namespace.QName;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

/**
 * The CalendarSerializer deserializes a dateTime.
 * Much of the work is done in the base class.
 * 
 * @author Sam Ruby (rubys@us.ibm.com)
 *         Modified for JAX-RPC @author Rich Scheuerle (scheu@us.ibm.com)
 */
public class CalendarDeserializer extends SimpleDeserializer {

    private static SimpleDateFormat zulu =
            new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    //  0123456789 0 123456789

    static {
        zulu.setTimeZone(TimeZone.getTimeZone("GMT"));
    }

    /**
     * The Deserializer is constructed with the xmlType and
     * javaType
     */
    public CalendarDeserializer(Class javaType, QName xmlType) {
        super(javaType, xmlType);
    }

    /**
     * The simple deserializer provides most of the stuff.
     * We just need to override makeValue().
     */
    public Object makeValue(String source) {
        Calendar calendar = Calendar.getInstance();
        Date date;
        boolean bc = false;

        // validate fixed portion of format
        if (source == null || source.length() == 0) {
            throw new NumberFormatException(
                    Messages.getMessage("badDateTime00"));
        }
        if (source.charAt(0) == '+') {
            source = source.substring(1);
        }
        if (source.charAt(0) == '-') {
            source = source.substring(1);
            bc = true;
        }
        if (source.length() < 19) {
            throw new NumberFormatException(
                    Messages.getMessage("badDateTime00"));
        }
        if (source.charAt(4) != '-' || source.charAt(7) != '-' ||
                source.charAt(10) != 'T') {
            throw new NumberFormatException(Messages.getMessage("badDate00"));
        }
        if (source.charAt(13) != ':' || source.charAt(16) != ':') {
            throw new NumberFormatException(Messages.getMessage("badTime00"));
        }
        // convert what we have validated so far
        try {
            synchronized (zulu) {
                date = zulu.parse(source.substring(0, 19) + ".000Z");
            }
        } catch (Exception e) {
            throw new NumberFormatException(e.toString());
        }
        int pos = 19;

        // parse optional milliseconds
        if (pos < source.length() && source.charAt(pos) == '.') {
            int milliseconds = 0;
            int start = ++pos;
            while (pos < source.length() &&
                    Character.isDigit(source.charAt(pos))) {
                pos++;
            }
            String decimal = source.substring(start, pos);
            if (decimal.length() == 3) {
                milliseconds = Integer.parseInt(decimal);
            } else if (decimal.length() < 3) {
                milliseconds = Integer.parseInt((decimal + "000")
                        .substring(0, 3));
            } else {
                milliseconds = Integer.parseInt(decimal.substring(0, 3));
                if (decimal.charAt(3) >= '5') {
                    ++milliseconds;
                }
            }

            // add milliseconds to the current date
            date.setTime(date.getTime() + milliseconds);
        }

        // parse optional timezone
        if (pos + 5 < source.length() &&
                (source.charAt(pos) == '+' || (source.charAt(pos) == '-'))) {
            if (!Character.isDigit(source.charAt(pos + 1)) ||
                    !Character.isDigit(source.charAt(pos + 2)) ||
                    source.charAt(pos + 3) != ':' ||
                    !Character.isDigit(source.charAt(pos + 4)) ||
                    !Character.isDigit(source.charAt(pos + 5))) {
                throw new NumberFormatException(
                        Messages.getMessage("badTimezone00"));
            }
            int hours = (source.charAt(pos + 1) - '0') * 10
                    + source.charAt(pos + 2) - '0';
            int mins = (source.charAt(pos + 4) - '0') * 10
                    + source.charAt(pos + 5) - '0';
            int milliseconds = (hours * 60 + mins) * 60 * 1000;

            // subtract milliseconds from current date to obtain GMT
            if (source.charAt(pos) == '+') {
                milliseconds = -milliseconds;
            }
            date.setTime(date.getTime() + milliseconds);
            pos += 6;
        }
        if (pos < source.length() && source.charAt(pos) == 'Z') {
            pos++;
            calendar.setTimeZone(TimeZone.getTimeZone("GMT"));
        }
        if (pos < source.length()) {
            throw new NumberFormatException(Messages.getMessage("badChars00"));
        }
        calendar.setTime(date);

        // support dates before the Christian era
        if (bc) {
            calendar.set(Calendar.ERA, GregorianCalendar.BC);
        }
        if (super.javaType == Date.class) {
            return date;
        } else {
            return calendar;
        }
    }
}