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comparison: src/net/fortuna/ical4j/model/IndexedPropertyList.java
src/net/fortuna/ical4j/model/IndexedPropertyList.java
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| 1 /** | |
| 2 * Copyright (c) 2012, Ben Fortuna | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * | |
| 9 * o Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * | |
| 12 * o Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * | |
| 16 * o Neither the name of Ben Fortuna nor the names of any other contributors | |
| 17 * may be used to endorse or promote products derived from this software | |
| 18 * without specific prior written permission. | |
| 19 * | |
| 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 */ | |
| 32 package net.fortuna.ical4j.model; | |
| 33 | |
| 34 import java.util.Collections; | |
| 35 import java.util.HashMap; | |
| 36 import java.util.Iterator; | |
| 37 import java.util.Map; | |
| 38 | |
| 39 /** | |
| 40 * $Id$ | |
| 41 * | |
| 42 * Created on 4/02/2006 | |
| 43 * | |
| 44 * Provides indexing of properties on a specific parameter. | |
| 45 * @author Ben Fortuna | |
| 46 */ | |
| 47 public class IndexedPropertyList { | |
| 48 | |
| 49 private static final PropertyList EMPTY_LIST = new PropertyList(); | |
| 50 | |
| 51 private Map index; | |
| 52 | |
| 53 /** | |
| 54 * Creates a new instance indexed on the parameters with the specified name. | |
| 55 * @param list a list of properties | |
| 56 * @param parameterName the name of parameters on which to index | |
| 57 */ | |
| 58 public IndexedPropertyList(final PropertyList list, final String parameterName) { | |
| 59 final Map indexedProperties = new HashMap(); | |
| 60 for (final Iterator i = list.iterator(); i.hasNext();) { | |
| 61 final Property property = (Property) i.next(); | |
| 62 for (final Iterator j = property.getParameters(parameterName).iterator(); j.hasNext();) { | |
| 63 final Parameter parameter = (Parameter) j.next(); | |
| 64 PropertyList properties = (PropertyList) indexedProperties.get(parameter.getValue()); | |
| 65 if (properties == null) { | |
| 66 properties = new PropertyList(); | |
| 67 indexedProperties.put(parameter.getValue(), properties); | |
| 68 } | |
| 69 properties.add(property); | |
| 70 } | |
| 71 } | |
| 72 this.index = Collections.unmodifiableMap(indexedProperties); | |
| 73 } | |
| 74 | |
| 75 /** | |
| 76 * Returns a list of properties containing a parameter with the | |
| 77 * specified value. | |
| 78 * @param paramValue the value of the parameter contained in the | |
| 79 * returned properties | |
| 80 * @return a property list | |
| 81 */ | |
| 82 public PropertyList getProperties(final String paramValue) { | |
| 83 PropertyList properties = (PropertyList) index.get(paramValue); | |
| 84 if (properties == null) { | |
| 85 properties = EMPTY_LIST; | |
| 86 } | |
| 87 return properties; | |
| 88 } | |
| 89 | |
| 90 /** | |
| 91 * Returns the first property containing a parameter with the specified | |
| 92 * value. | |
| 93 * @param paramValue the value of the parameter identified in the returned | |
| 94 * property | |
| 95 * @return a property or null if no property is found containing a parameter | |
| 96 * with the specified value | |
| 97 */ | |
| 98 public Property getProperty(final String paramValue) { | |
| 99 final PropertyList properties = getProperties(paramValue); | |
| 100 if (!properties.isEmpty()) { | |
| 101 return (Property) properties.iterator().next(); | |
| 102 } | |
| 103 return null; | |
| 104 } | |
| 105 } |
