/*
 * $Id: FreeBusy.java,v 1.8 2005/09/28 10:10:38 fortuna Exp $
 * 
 * Created: [Apr 14, 2004]
 *
 * Copyright (c) 2004, Ben Fortuna
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  o Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 *  o Neither the name of Ben Fortuna nor the names of any other contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.fortuna.ical4j.model.property;

import java.text.ParseException;

import net.fortuna.ical4j.model.Parameter;
import net.fortuna.ical4j.model.ParameterList;
import net.fortuna.ical4j.model.PeriodList;
import net.fortuna.ical4j.model.Property;
import net.fortuna.ical4j.model.ValidationException;
import net.fortuna.ical4j.util.ParameterValidator;

/**
 * Defines a FREEBUSY iCalendar component property.
 *
 * <pre>
 * 4.8.2.6 Free/Busy Time
 * 
 *    Property Name: FREEBUSY
 * 
 *    Purpose: The property defines one or more free or busy time
 *    intervals.
 * 
 *    Value Type: PERIOD. The date and time values MUST be in an UTC time
 *    format.
 * 
 *    Property Parameters: Non-standard or free/busy time type property
 *    parameters can be specified on this property.
 * 
 *    Conformance: The property can be specified in a "VFREEBUSY" calendar
 *    component.
 * 
 *    Property Parameter: "FBTYPE" and non-standard parameters can be
 *    specified on this property.
 * 
 *    Description: These time periods can be specified as either a start
 *    and end date-time or a start date-time and duration. The date and
 *    time MUST be a UTC time format.
 * 
 *    "FREEBUSY" properties within the "VFREEBUSY" calendar component
 *    SHOULD be sorted in ascending order, based on start time and then end
 *    time, with the earliest periods first.
 * 
 *    The "FREEBUSY" property can specify more than one value, separated by
 *    the COMMA character (US-ASCII decimal 44). In such cases, the
 *    "FREEBUSY" property values SHOULD all be of the same "FBTYPE"
 *    property parameter type (e.g., all values of a particular "FBTYPE"
 *    listed together in a single property).
 * 
 *    Format Definition: The property is defined by the following notation:
 * 
 *      freebusy   = "FREEBUSY" fbparam ":" fbvalue
 *                   CRLF
 * 
 *      fbparam    = *(
 *                 ; the following is optional,
 *                 ; but MUST NOT occur more than once
 * 
 *                 (";" fbtypeparam) /
 * 
 *                 ; the following is optional,
 *                 ; and MAY occur more than once
 * 
 *                 (";" xparam)
 * 
 *                 )
 * 
 *      fbvalue    = period *["," period]
 *      ;Time value MUST be in the UTC time format.
 * </pre>
 * 
 * @author Ben Fortuna
 */
public class FreeBusy extends Property {
    
    private static final long serialVersionUID = -6415954847619338567L;

    private PeriodList periods;

    /**
     * Default constructor.
     */
    public FreeBusy() {
        super(FREEBUSY);
        periods = new PeriodList();
    }
    
    /**
     * @param aList
     *            a list of parameters for this component
     * @param aValue
     *            a value string for this component
     * @throws ParseException
     *             when the specified string is not a valid list of periods
     */
    public FreeBusy(final ParameterList aList, final String aValue)
            throws ParseException {
        super(FREEBUSY, aList);
        setValue(aValue);
    }

    /**
     * @param pList
     *            a list of periods
     */
    public FreeBusy(final PeriodList pList) {
        super(FREEBUSY);
        periods = pList;
    }

    /**
     * @param aList
     *            a list of parameters for this component
     * @param pList
     *            a list of periods
     */
    public FreeBusy(final ParameterList aList, final PeriodList pList) {
        super(FREEBUSY, aList);
        periods = pList;
    }

    /**
     * @see net.fortuna.ical4j.model.Property#validate()
     */
    public final void validate() throws ValidationException {

        /*
         * ; the following is optional, ; but MUST NOT occur more than once
         *
         * (";" fbtypeparam) /
         */
        ParameterValidator.getInstance().assertOneOrLess(Parameter.FBTYPE,
                getParameters());

        /*
         * ; the following is optional, ; and MAY occur more than once
         *
         * (";" xparam)
         */
    }

    /**
     * @return Returns the periods.
     */
    public final PeriodList getPeriods() {
        return periods;
    }
    
    
    /* (non-Javadoc)
     * @see net.fortuna.ical4j.model.Property#setValue(java.lang.String)
     */
    public final void setValue(final String aValue) throws ParseException {
        periods = new PeriodList(aValue);
    }

    /*
     * (non-Javadoc)
     *
     * @see net.fortuna.ical4j.model.Property#getValue()
     */
    public final String getValue() {
        return getPeriods().toString();
    }
}
