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443a0167bc
The type parameters disappeared when viewing resulting javadoc and this made it look confusingly like the class is a shorthand for Map rather than Map of QName to Serializable as it actually is. git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@32736 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
105 lines
3.2 KiB
Java
105 lines
3.2 KiB
Java
/*
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* Copyright (C) 2005-2010 Alfresco Software Limited.
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*
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* This file is part of Alfresco
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.alfresco.util;
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import java.io.Serializable;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import org.alfresco.service.namespace.QName;
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import org.alfresco.util.Pair;
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/**
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* Property map helper class.
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* <p>
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* This class can be used as a short hand when a class of type
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* Map<QName, Serializable> is required.
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*
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* @author Roy Wetherall
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*/
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public class PropertyMap extends HashMap<QName, Serializable>
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{
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private static final long serialVersionUID = 8052326301073209645L;
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/**
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* A static empty map to us when having to deal with nulls
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*/
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public static final Map<QName, Serializable> EMPTY_MAP = Collections.<QName, Serializable>emptyMap();
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/**
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* @see HashMap#HashMap(int, float)
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*/
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public PropertyMap(int initialCapacity, float loadFactor)
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{
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super(initialCapacity, loadFactor);
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}
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/**
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* @see HashMap#HashMap(int)
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*/
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public PropertyMap(int initialCapacity)
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{
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super(initialCapacity);
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}
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/**
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* @see HashMap#HashMap()
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*/
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public PropertyMap()
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{
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super();
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}
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/**
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* Utility method to remove unchanged entries from each map.
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*
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* @param before the properties before (may be <tt>null</tt>)
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* @param after the properties after (may be <tt>null</tt>)
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* @return Return a map of values that <b>changed</b> from before to after.
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* The before value is first and the after value is second.
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*
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* @since 3.2
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*/
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public static Pair<Map<QName, Serializable>, Map<QName, Serializable>> getBeforeAndAfterMapsForChanges(
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Map<QName, Serializable> before,
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Map<QName, Serializable> after)
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{
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// Shortcuts
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if (before == null)
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{
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before = Collections.emptyMap();
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}
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if (after == null)
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{
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after = Collections.emptyMap();
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}
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// Get after values that changed
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Map<QName, Serializable> afterDelta = new HashMap<QName, Serializable>(after);
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afterDelta.entrySet().removeAll(before.entrySet());
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// Get before values that changed
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Map<QName, Serializable> beforeDelta = new HashMap<QName, Serializable>(before);
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beforeDelta.entrySet().removeAll(after.entrySet());
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// Done
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return new Pair<Map<QName, Serializable>, Map<QName, Serializable>>(beforeDelta, afterDelta);
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}
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}
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