/*
 * Copyright 2002-2004 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.types;

import org.apache.axis.utils.Messages;

import java.text.NumberFormat;

/**
 * Implementation of the XML Schema type gMonth
 *
 * @author Tom Jordahl <tomj@macromedia.com>
 * @see <a href="http://www.w3.org/TR/xmlschema-2/#gMonth">XML Schema 3.2.14</a>
 */
public class Month implements java.io.Serializable {
    int month;
    String timezone = null;

    /**
     * Constructs a Month with the given values
     * No timezone is specified
     */
    public Month(int month) throws NumberFormatException {
        setValue(month);
    }

    /**
     * Constructs a Month with the given values, including a timezone string
     * The timezone is validated but not used.
     */
    public Month(int month, String timezone)
        throws NumberFormatException {
        setValue(month, timezone);
    }

    /**
     * Construct a Month from a String in the format --MM--[timezone]
     */
    public Month(String source) throws NumberFormatException {
        if (source.length() < (6)) {
            throw new NumberFormatException(
                    Messages.getMessage("badMonth00"));
        }

        if (source.charAt(0) != '-' ||
            source.charAt(1) != '-' ||
            source.charAt(4) != '-' ||
            source.charAt(5) != '-' ) {
            throw new NumberFormatException(
                    Messages.getMessage("badMonth00"));
        }

        setValue(Integer.parseInt(source.substring(2,4)),
                 source.substring(6));
    }

    public int getMonth() {
        return month;
    }

    public void setMonth(int month) {
        // validate month
        if (month < 1 || month > 12) {
            throw new NumberFormatException(
                    Messages.getMessage("badMonth00"));
        }
        this.month = month;
    }

    public String getTimezone() {
        return timezone;
    }

    public void setTimezone(String timezone) {
        // validate timezone
        if (timezone != null && timezone.length() > 0) {
            // Format [+/-]HH:MM
            if (timezone.charAt(0)=='+' || (timezone.charAt(0)=='-')) {
                    if (timezone.length() != 6 ||
                        !Character.isDigit(timezone.charAt(1)) ||
                        !Character.isDigit(timezone.charAt(2)) ||
                        timezone.charAt(3) != ':'              ||
                        !Character.isDigit(timezone.charAt(4)) ||
                        !Character.isDigit(timezone.charAt(5)))
                        throw new NumberFormatException(
                                Messages.getMessage("badTimezone00"));

            } else if (!timezone.equals("Z")) {
                throw new NumberFormatException(
                        Messages.getMessage("badTimezone00"));
            }
            // if we got this far, its good
            this.timezone = timezone;
        }
    }

    public void setValue(int month, String timezone) throws NumberFormatException {
        setMonth(month);
        setTimezone(timezone);
    }

    public void setValue(int month) throws NumberFormatException {
        setMonth(month);
    }

    public String toString() {
        // use NumberFormat to ensure leading zeros
        NumberFormat nf = NumberFormat.getInstance();
        nf.setGroupingUsed(false);

        // month
        nf.setMinimumIntegerDigits(2);
        String s = "--" + nf.format(month) + "--";

        // timezone
        if (timezone != null) {
            s = s + timezone;
        }
        return s;
    }

    public boolean equals(Object obj) {
        if (!(obj instanceof Month)) return false;
        Month other = (Month) obj;
        if (obj == null) return false;
        if (this == obj) return true;

        boolean equals = (this.month == other.month);
        if (timezone != null) {
            equals = equals && timezone.equals(other.timezone);
        }
        return equals;
    }

    /**
     * Return the value of month XORed with the hashCode of timezone
     * iff one is defined.
     *
     * @return an <code>int</code> value
     */
    public int hashCode() {
        return null == timezone ? month : month ^ timezone.hashCode();
    }
}