diff -r 5ae3e5665a0b -r cc93757aeca3 src/net/fortuna/ical4j/util/Calendars.java --- a/src/net/fortuna/ical4j/util/Calendars.java Thu Feb 12 18:02:00 2015 +0100 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,231 +0,0 @@ -/** - * 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.util; - -import java.io.FileInputStream; -import java.io.IOException; -import java.net.URL; -import java.nio.charset.Charset; -import java.util.HashMap; -import java.util.Iterator; -import java.util.Map; - -import net.fortuna.ical4j.data.CalendarBuilder; -import net.fortuna.ical4j.data.ParserException; -import net.fortuna.ical4j.model.Calendar; -import net.fortuna.ical4j.model.Component; -import net.fortuna.ical4j.model.ComponentList; -import net.fortuna.ical4j.model.ConstraintViolationException; -import net.fortuna.ical4j.model.IndexedComponentList; -import net.fortuna.ical4j.model.Parameter; -import net.fortuna.ical4j.model.Property; -import net.fortuna.ical4j.model.component.VTimeZone; -import net.fortuna.ical4j.model.parameter.TzId; -import net.fortuna.ical4j.model.property.Method; -import net.fortuna.ical4j.model.property.Uid; - -/** - * $Id$ - * - * Created on 10/11/2006 - * - * Utility method for working with {@link Calendar}s. - * @author Ben Fortuna - */ -public final class Calendars { - - /** - * Constructor made private to enforce static nature. - */ - private Calendars() { - } - - /** - * Loads a calendar from the specified file. - * @param filename the name of the file from which to load calendar data - * @return returns a new calendar instance initialised from the specified file - * @throws IOException occurs when there is an error reading the specified file - * @throws ParserException occurs when the data in the specified file is invalid - */ - public static Calendar load(final String filename) throws IOException, ParserException { - final FileInputStream fin = new FileInputStream(filename); - final CalendarBuilder builder = new CalendarBuilder(); - return builder.build(fin); - } - - /** - * Loads a calendar from the specified URL. - * @param url the URL from which to load calendar data - * @return returns a new calendar instance initialised from the specified URL - * @throws IOException occurs when there is an error reading from the specified URL - * @throws ParserException occurs when the data in the specified URL is invalid - */ - public static Calendar load(final URL url) throws IOException, ParserException { - final CalendarBuilder builder = new CalendarBuilder(); - return builder.build(url.openStream()); - } - - /** - * Merge all properties and components from two specified calendars into one instance. - * Note that the merge process is not very sophisticated, and may result in invalid calendar - * data (e.g. multiple properties of a type that should only be specified once). - * @param c1 the first calendar to merge - * @param c2 the second calendar to merge - * @return a Calendar instance containing all properties and components from both of the specified calendars - */ - public static Calendar merge(final Calendar c1, final Calendar c2) { - final Calendar result = new Calendar(); - result.getProperties().addAll(c1.getProperties()); - for (final Iterator i = c2.getProperties().iterator(); i.hasNext();) { - final Property p = (Property) i.next(); - if (!result.getProperties().contains(p)) { - result.getProperties().add(p); - } - } - result.getComponents().addAll(c1.getComponents()); - for (final Iterator i = c2.getComponents().iterator(); i.hasNext();) { - final Component c = (Component) i.next(); - if (!result.getComponents().contains(c)) { - result.getComponents().add(c); - } - } - return result; - } - - /** - * Wraps a component in a calendar. - * @param component the component to wrap with a calendar - * @return a calendar containing the specified component - */ - public static Calendar wrap(final Component component) { - final ComponentList components = new ComponentList(); - components.add(component); - return new Calendar(components); - } - - /** - * Splits a calendar object into distinct calendar objects for unique - * identifers (UID). - * @param calendar a calendar instance - * @return an array of calendar objects - */ - public static Calendar[] split(final Calendar calendar) { - // if calendar contains one component or less, or is composed entirely of timezone - // definitions, return the original calendar unmodified.. - if (calendar.getComponents().size() <= 1 - || calendar.getComponents(Component.VTIMEZONE).size() == calendar.getComponents().size()) { - return new Calendar[] {calendar}; - } - - final IndexedComponentList timezones = new IndexedComponentList(calendar.getComponents(Component.VTIMEZONE), - Property.TZID); - - final Map calendars = new HashMap(); - for (final Iterator i = calendar.getComponents().iterator(); i.hasNext();) { - final Component c = (Component) i.next(); - if (c instanceof VTimeZone) { - continue; - } - - final Uid uid = (Uid) c.getProperty(Property.UID); - - Calendar uidCal = (Calendar) calendars.get(uid); - if (uidCal == null) { - uidCal = new Calendar(calendar.getProperties(), new ComponentList()); - // remove METHOD property for split calendars.. - for (final Iterator mp = uidCal.getProperties(Property.METHOD).iterator(); mp.hasNext();) { - uidCal.getProperties().remove(mp.next()); - } - calendars.put(uid, uidCal); - } - - for (final Iterator j = c.getProperties().iterator(); j.hasNext();) { - final Property p = (Property) j.next(); - final TzId tzid = (TzId) p.getParameter(Parameter.TZID); - if (tzid != null) { - final VTimeZone timezone = (VTimeZone) timezones.getComponent(tzid.getValue()); - if (!uidCal.getComponents().contains(timezone)) { - uidCal.getComponents().add(timezone); - } - } - } - uidCal.getComponents().add(c); - } - return (Calendar[]) calendars.values().toArray(new Calendar[calendars.values().size()]); - } - - /** - * Returns a unique identifier as specified by components in the provided calendar. - * @param calendar a calendar instance - * @return the UID property - * @throws ConstraintViolationException if zero or more than one unique identifer is found in the specified calendar - */ - public static Uid getUid(final Calendar calendar) throws ConstraintViolationException { - Uid uid = null; - for (final Iterator i = calendar.getComponents().iterator(); i.hasNext();) { - final Component c = (Component) i.next(); - for (final Iterator j = c.getProperties(Property.UID).iterator(); j.hasNext();) { - final Uid foundUid = (Uid) j.next(); - if (uid != null && !uid.equals(foundUid)) { - throw new ConstraintViolationException("More than one UID found in calendar"); - } - uid = foundUid; - } - } - if (uid == null) { - throw new ConstraintViolationException("Calendar must specify a single unique identifier (UID)"); - } - return uid; - } - - /** - * Returns an appropriate MIME Content-Type for the specified calendar object. - * @param calendar a calendar instance - * @param charset an optional encoding - * @return a content type string - */ - public static String getContentType(Calendar calendar, Charset charset) { - final StringBuffer b = new StringBuffer("text/calendar"); - - final Method method = (Method) calendar.getProperty(Property.METHOD); - if (method != null) { - b.append("; method="); - b.append(method.getValue()); - } - - if (charset != null) { - b.append("; charset="); - b.append(charset); - } - return b.toString(); - } -}