Caldavsync Sources: src/net/fortuna/ical4j/model/IndexedPropertyList.java@45d57ecba757

     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;

    34 import java.util.Collections;

    35 import java.util.HashMap;

    36 import java.util.Iterator;

    37 import java.util.Map;

    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 {

    49     private static final PropertyList EMPTY_LIST = new PropertyList();

    51     private Map index;

    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     }

    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     }

    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 }

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