1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/net/fortuna/ical4j/model/IndexedComponentList.java Tue Feb 10 18:12:00 2015 +0100
1.3 @@ -0,0 +1,105 @@
1.4 +/**
1.5 + * Copyright (c) 2012, Ben Fortuna
1.6 + * All rights reserved.
1.7 + *
1.8 + * Redistribution and use in source and binary forms, with or without
1.9 + * modification, are permitted provided that the following conditions
1.10 + * are met:
1.11 + *
1.12 + * o Redistributions of source code must retain the above copyright
1.13 + * notice, this list of conditions and the following disclaimer.
1.14 + *
1.15 + * o Redistributions in binary form must reproduce the above copyright
1.16 + * notice, this list of conditions and the following disclaimer in the
1.17 + * documentation and/or other materials provided with the distribution.
1.18 + *
1.19 + * o Neither the name of Ben Fortuna nor the names of any other contributors
1.20 + * may be used to endorse or promote products derived from this software
1.21 + * without specific prior written permission.
1.22 + *
1.23 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.24 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.25 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.26 + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.27 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.28 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.29 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.30 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.31 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.32 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.33 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.34 + */
1.35 +package net.fortuna.ical4j.model;
1.36 +
1.37 +import java.util.Collections;
1.38 +import java.util.HashMap;
1.39 +import java.util.Iterator;
1.40 +import java.util.Map;
1.41 +
1.42 +/**
1.43 + * $Id$
1.44 + *
1.45 + * Created on 4/02/2006
1.46 + *
1.47 + * Provides indexing of components on a specific property.
1.48 + * @author Ben Fortuna
1.49 + */
1.50 +public class IndexedComponentList {
1.51 +
1.52 + private static final ComponentList EMPTY_LIST = new ComponentList();
1.53 +
1.54 + private Map index;
1.55 +
1.56 + /**
1.57 + * Creates a new instance indexed on properties with the specified name.
1.58 + * @param list a list of components
1.59 + * @param propertyName the name of the properties to index on
1.60 + */
1.61 + public IndexedComponentList(final ComponentList list, final String propertyName) {
1.62 + final Map indexedComponents = new HashMap();
1.63 + for (final Iterator i = list.iterator(); i.hasNext();) {
1.64 + final Component component = (Component) i.next();
1.65 + for (final Iterator j = component.getProperties(propertyName).iterator(); j.hasNext();) {
1.66 + final Property property = (Property) j.next();
1.67 + ComponentList components = (ComponentList) indexedComponents.get(property.getValue());
1.68 + if (components == null) {
1.69 + components = new ComponentList();
1.70 + indexedComponents.put(property.getValue(), components);
1.71 + }
1.72 + components.add(component);
1.73 + }
1.74 + }
1.75 + this.index = Collections.unmodifiableMap(indexedComponents);
1.76 + }
1.77 +
1.78 + /**
1.79 + * Returns a list of components containing a property with the
1.80 + * specified value.
1.81 + * @param propertyValue the value of the property contained in the
1.82 + * returned components
1.83 + * @return a component list
1.84 + */
1.85 + public ComponentList getComponents(final String propertyValue) {
1.86 + ComponentList components = (ComponentList) index.get(propertyValue);
1.87 + if (components == null) {
1.88 + components = EMPTY_LIST;
1.89 + }
1.90 + return components;
1.91 + }
1.92 +
1.93 + /**
1.94 + * Returns the first component containing a property with the specified
1.95 + * value.
1.96 + * @param propertyValue the value of the property identified in the returned
1.97 + * component
1.98 + * @return a component or null if no component is found containing a property
1.99 + * with the specified value
1.100 + */
1.101 + public Component getComponent(final String propertyValue) {
1.102 + final ComponentList components = getComponents(propertyValue);
1.103 + if (!components.isEmpty()) {
1.104 + return (Component) components.iterator().next();
1.105 + }
1.106 + return null;
1.107 + }
1.108 +}
