diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/property/FreeBusy.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/property/FreeBusy.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,206 @@
+/**
+ * Copyright (c) 2012, 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.PropertyFactoryImpl;
+import net.fortuna.ical4j.model.ValidationException;
+import net.fortuna.ical4j.util.ParameterValidator;
+
+/**
+ * $Id$
+ * 
+ * Created: [Apr 14, 2004]
+ *
+ * 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 &quot;VFREEBUSY&quot; calendar
+ *        component.
+ *     
+ *        Property Parameter: &quot;FBTYPE&quot; 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.
+ *     
+ *        &quot;FREEBUSY&quot; properties within the &quot;VFREEBUSY&quot; calendar component
+ *        SHOULD be sorted in ascending order, based on start time and then end
+ *        time, with the earliest periods first.
+ *     
+ *        The &quot;FREEBUSY&quot; property can specify more than one value, separated by
+ *        the COMMA character (US-ASCII decimal 44). In such cases, the
+ *        &quot;FREEBUSY&quot; property values SHOULD all be of the same &quot;FBTYPE&quot;
+ *        property parameter type (e.g., all values of a particular &quot;FBTYPE&quot;
+ *        listed together in a single property).
+ *     
+ *        Format Definition: The property is defined by the following notation:
+ *     
+ *          freebusy   = &quot;FREEBUSY&quot; fbparam &quot;:&quot; fbvalue
+ *                       CRLF
+ *     
+ *          fbparam    = *(
+ *                     ; the following is optional,
+ *                     ; but MUST NOT occur more than once
+ *     
+ *                     (&quot;;&quot; fbtypeparam) /
+ *     
+ *                     ; the following is optional,
+ *                     ; and MAY occur more than once
+ *     
+ *                     (&quot;;&quot; xparam)
+ *     
+ *                     )
+ *     
+ *          fbvalue    = period *[&quot;,&quot; 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, PropertyFactoryImpl.getInstance());
+        periods = new PeriodList();
+    }
+
+    /**
+     * @param aValue a freebusy value
+     * @throws ParseException where the specified string is not a valid freebusy value
+     */
+    public FreeBusy(final String aValue) throws ParseException {
+        super(FREEBUSY, PropertyFactoryImpl.getInstance());
+        setValue(aValue);
+    }
+    
+    /**
+     * @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, PropertyFactoryImpl.getInstance());
+        setValue(aValue);
+    }
+
+    /**
+     * @param pList a list of periods
+     */
+    public FreeBusy(final PeriodList pList) {
+        super(FREEBUSY, PropertyFactoryImpl.getInstance());
+        if (!pList.isUtc()) {
+            throw new IllegalArgumentException("Periods must be in UTC format");
+        }
+        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, PropertyFactoryImpl.getInstance());
+        if (!pList.isUtc()) {
+            throw new IllegalArgumentException("Periods must be in UTC format");
+        }
+        periods = pList;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    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)
+         */
+        
+        if (!periods.isUtc()) {
+            throw new ValidationException("Periods must be in UTC format");
+        }
+    }
+
+    /**
+     * @return Returns the periods.
+     */
+    public final PeriodList getPeriods() {
+        return periods;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final void setValue(final String aValue) throws ParseException {
+        periods = new PeriodList(aValue);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final String getValue() {
+        return getPeriods().toString();
+    }
+}