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A fork of iCal4j with customizations for Bedework.
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/**
 * Copyright (c) 2010, 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 net.fortuna.ical4j.model.ParameterList;
import net.fortuna.ical4j.model.Property;
import net.fortuna.ical4j.model.PropertyFactoryImpl;
import net.fortuna.ical4j.model.ValidationException;

/**
 * $Id: Version.java,v 1.19 2010/03/06 12:57:23 fortuna Exp $
 *
 * Created: [Apr 6, 2004]
 *
 * Defines a VERSION iCalendar property. When creating a new calendar you should always add a version property with
 * value "2.0". There is actually a constant defined in the Version class for this. e.g:
 *     Calendar calendar = new Calendar();
 *     calendar.getProperties().add(Version.VERSION_2_0);
 * @author Ben Fortuna
 */
public class Version extends Property {

    private static final long serialVersionUID = 8872508067309087704L;

    /**
     * iCalendar version 2.0.
     */
    public static final Version VERSION_2_0 = new ImmutableVersion("2.0");

    /**
     * @author Ben Fortuna An immutable instance of Version.
     */
    private static final class ImmutableVersion extends Version {

        private static final long serialVersionUID = -5040679357859594835L;

        private ImmutableVersion(final String value) {
            super(new ParameterList(true), value);
        }

        public void setValue(final String aValue) {
            throw new UnsupportedOperationException(
                    "Cannot modify constant instances");
        }

        public void setMaxVersion(final String maxVersion) {
            throw new UnsupportedOperationException(
                    "Cannot modify constant instances");
        }

        public void setMinVersion(final String minVersion) {
            throw new UnsupportedOperationException(
                    "Cannot modify constant instances");
        }
    }

    private String minVersion;

    private String maxVersion;

    /**
     * Default constructor.
     */
    public Version() {
        super(VERSION, PropertyFactoryImpl.getInstance());
    }

    /**
     * @param aList a list of parameters for this component
     * @param aValue a value string for this component
     */
    public Version(final ParameterList aList, final String aValue) {
        super(VERSION, aList, PropertyFactoryImpl.getInstance());
        if (aValue.indexOf(';') >= 0) {
            this.minVersion = aValue.substring(0, aValue.indexOf(';') - 1);
            this.maxVersion = aValue.substring(aValue.indexOf(';'));
        }
        else {
            this.maxVersion = aValue;
        }
    }

    /**
     * @param minVersion a string representation of the minimum version
     * @param maxVersion a string representation of the maximum version
     */
    public Version(final String minVersion, final String maxVersion) {
        super(VERSION, PropertyFactoryImpl.getInstance());
        this.minVersion = minVersion;
        this.maxVersion = maxVersion;
    }

    /**
     * @param aList a list of parameters for this component
     * @param aVersion1 a string representation of the minimum version
     * @param aVersion2 a string representation of the maximum version
     */
    public Version(final ParameterList aList, final String aVersion1,
            final String aVersion2) {
        super(VERSION, aList, PropertyFactoryImpl.getInstance());
        minVersion = aVersion1;
        maxVersion = aVersion2;
    }

    /**
     * @return Returns the maxVersion.
     */
    public final String getMaxVersion() {
        return maxVersion;
    }

    /**
     * @return Returns the minVersion.
     */
    public final String getMinVersion() {
        return minVersion;
    }

    /**
     * {@inheritDoc}
     */
    public void setValue(final String aValue) {
        if (aValue.indexOf(';') >= 0) {
            this.minVersion = aValue.substring(0, aValue.indexOf(';') - 1);
            this.maxVersion = aValue.substring(aValue.indexOf(';'));
        }
        else {
            this.maxVersion = aValue;
        }
    }

    /**
     * {@inheritDoc}
     */
    public final String getValue() {
        final StringBuffer b = new StringBuffer();
        if (getMinVersion() != null) {
            b.append(getMinVersion());
            if (getMaxVersion() != null) {
                b.append(';');
            }
        }
        if (getMaxVersion() != null) {
            b.append(getMaxVersion());
        }
        return b.toString();
    }

    /**
     * @param maxVersion The maxVersion to set.
     */
    public void setMaxVersion(final String maxVersion) {
        this.maxVersion = maxVersion;
    }

    /**
     * @param minVersion The minVersion to set.
     */
    public void setMinVersion(final String minVersion) {
        this.minVersion = minVersion;
    }

    /**
     * {@inheritDoc}
     */
    public final void validate() throws ValidationException {
        // TODO: Auto-generated method stub
    }
}