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08fd123241
Exposed extracter OverwritePolicy, but it still defaults to the OverwritePolicy specified in the extracters configuration. git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@6013 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
307 lines
14 KiB
Java
307 lines
14 KiB
Java
/*
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* Copyright (C) 2005 Jesper Steen Møller
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program 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 General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* As a special exception to the terms and conditions of version 2.0 of
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* the GPL, you may redistribute this Program in connection with Free/Libre
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* and Open Source Software ("FLOSS") applications as described in Alfresco's
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* FLOSS exception. You should have recieved a copy of the text describing
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* the FLOSS exception, and it is also available here:
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* http://www.alfresco.com/legal/licensing"
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*/
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package org.alfresco.repo.content.metadata;
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import java.io.Serializable;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Set;
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import org.alfresco.repo.content.ContentWorker;
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import org.alfresco.service.cmr.repository.ContentIOException;
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import org.alfresco.service.cmr.repository.ContentReader;
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import org.alfresco.service.namespace.QName;
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/**
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* Interface for document property extracters.
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* <p>
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* Please pardon the incorrect spelling of <i>extractor</i>.
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*
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* @author Jesper Steen Møller
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* @author Derek Hulley
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*/
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public interface MetadataExtracter extends ContentWorker
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{
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/**
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* A enumeration of functional property overwrite policies. These determine whether extracted properties are
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* written into the property map or not.
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*
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* @author Derek Hulley
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* @author Jesper Steen Møller
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*/
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public enum OverwritePolicy
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{
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/**
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* This policy puts the new value if:
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* <ul>
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* <li>the extracted property is not null</li>
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* </ul>
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*/
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EAGER
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{
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@Override
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public Map<QName, Serializable> applyProperties(Map<QName, Serializable> extractedProperties, Map<QName, Serializable> targetProperties)
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{
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Map<QName, Serializable> modifiedProperties = new HashMap<QName, Serializable>(7);
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for (Map.Entry<QName, Serializable> entry : extractedProperties.entrySet())
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{
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QName propertyQName = entry.getKey();
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Serializable extractedValue = entry.getValue();
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// Ignore null extracted value
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if (extractedValue == null)
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{
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continue;
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}
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targetProperties.put(propertyQName, extractedValue);
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modifiedProperties.put(propertyQName, extractedValue);
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}
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return modifiedProperties;
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}
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},
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/**
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* This policy puts the new value if:
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* <ul>
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* <li>the extracted property is not null</li>
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* <li>there is no target key for the property</li>
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* <li>the target value is null</li>
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* <li>the string representation of the target value is an empty string</li>
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* </ul>
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*/
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PRAGMATIC
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{
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@Override
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public Map<QName, Serializable> applyProperties(Map<QName, Serializable> extractedProperties, Map<QName, Serializable> targetProperties)
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{
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/*
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* Negative and positive checks are mixed in the loop.
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*/
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Map<QName, Serializable> modifiedProperties = new HashMap<QName, Serializable>(7);
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for (Map.Entry<QName, Serializable> entry : extractedProperties.entrySet())
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{
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QName propertyQName = entry.getKey();
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Serializable extractedValue = entry.getValue();
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// Ignore null extracted value
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if (extractedValue == null)
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{
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continue;
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}
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// Handle the shortcut cases where the target value is missing or null
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if (!targetProperties.containsKey(propertyQName))
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{
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// There is nothing currently
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targetProperties.put(propertyQName, extractedValue);
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modifiedProperties.put(propertyQName, extractedValue);
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continue;
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}
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Serializable originalValue = targetProperties.get(propertyQName);
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if (originalValue == null)
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{
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// The current value is null
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targetProperties.put(propertyQName, extractedValue);
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modifiedProperties.put(propertyQName, extractedValue);
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continue;
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}
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// Check the string representation
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if (originalValue instanceof String)
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{
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String originalValueStr = (String) originalValue;
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if (originalValueStr != null && originalValueStr.length() > 0)
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{
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// The original value is non-trivial
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continue;
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}
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else
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{
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// The original string is trivial
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targetProperties.put(propertyQName, extractedValue);
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modifiedProperties.put(propertyQName, extractedValue);
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continue;
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}
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}
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// We have some other object as the original value, so keep it
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}
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return modifiedProperties;
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}
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},
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/**
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* This policy only puts the extracted value if there is no value (null or otherwise) in the properties map.
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* It is assumed that the mere presence of a property key is enough to inidicate that the target property
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* is as intented.
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* This policy puts the new value if:
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* <ul>
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* <li>the extracted property is not null</li>
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* <li>there is no target key for the property</li>
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* </ul>
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*/
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CAUTIOUS
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{
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@Override
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public Map<QName, Serializable> applyProperties(Map<QName, Serializable> extractedProperties, Map<QName, Serializable> targetProperties)
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{
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Map<QName, Serializable> modifiedProperties = new HashMap<QName, Serializable>(7);
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for (Map.Entry<QName, Serializable> entry : extractedProperties.entrySet())
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{
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QName propertyQName = entry.getKey();
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Serializable extractedValue = entry.getValue();
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// Ignore null extracted value
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if (extractedValue == null)
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{
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continue;
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}
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// Is the key present in the target values
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if (targetProperties.containsKey(propertyQName))
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{
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// Cautiously bypass the value as there is one already
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continue;
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}
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targetProperties.put(propertyQName, extractedValue);
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modifiedProperties.put(propertyQName, extractedValue);
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}
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return modifiedProperties;
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}
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};
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/**
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* Apply the overwrite policy for the extracted properties.
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*
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* @return
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* Returns a map of all properties that were applied to the target map. If the result is
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* an empty map, then the target map remains unchanged.
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*/
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public Map<QName, Serializable> applyProperties(Map<QName, Serializable> extractedProperties, Map<QName, Serializable> targetProperties)
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{
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throw new UnsupportedOperationException("Override this method");
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}
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};
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/**
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* Get an estimate of the extracter's reliability on a scale from 0.0 to 1.0.
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*
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* @param mimetype the mimetype to check
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* @return Returns a reliability indicator from 0.0 to 1.0
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*
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* @deprecated This method is replaced by {@link #isSupported(String)}
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*/
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public double getReliability(String mimetype);
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/**
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* Determines if the extracter works against the given mimetype.
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*
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* @param mimetype the document mimetype
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* @return Returns <tt>true</tt> if the mimetype is supported, otherwise <tt>false</tt>.
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*/
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public boolean isSupported(String mimetype);
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/**
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* Provides an estimate, usually a worst case guess, of how long an
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* extraction will take.
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* <p>
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* This method is used to determine, up front, which of a set of equally
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* reliant transformers will be used for a specific extraction.
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*
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* @return Returns the approximate number of milliseconds per transformation
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*/
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public long getExtractionTime();
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/**
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* Extracts the metadata values from the content provided by the reader and source
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* mimetype to the supplied map. The internal mapping and {@link OverwritePolicy overwrite policy}
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* between document metadata and system metadata will be used.
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* <p>
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* The extraction viability can be determined by an up front call to {@link #isSupported(String)}.
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* <p>
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* The source mimetype <b>must</b> be available on the
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* {@link org.alfresco.service.cmr.repository.ContentAccessor#getMimetype()} method
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* of the reader.
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*
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* @param reader the source of the content
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* @param destination the map of properties to populate (essentially a return value)
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* @return Returns a map of all properties on the destination map that were
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* added or modified. If the return map is empty, then no properties
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* were modified.
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* @throws ContentIOException if a detectable error occurs
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*
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* @see #extract(ContentReader, OverwritePolicy, Map, Map)
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*/
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public Map<QName, Serializable> extract(ContentReader reader, Map<QName, Serializable> destination);
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/**
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* Extracts the metadata values from the content provided by the reader and source
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* mimetype to the supplied map.
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* <p>
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* The extraction viability can be determined by an up front call to {@link #isSupported(String)}.
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* <p>
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* The source mimetype <b>must</b> be available on the
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* {@link org.alfresco.service.cmr.repository.ContentAccessor#getMimetype()} method
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* of the reader.
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*
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* @param reader the source of the content
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* @param overwritePolicy the policy stipulating how the system properties must be
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* overwritten if present
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* @param destination the map of properties to populate (essentially a return value)
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* @return Returns a map of all properties on the destination map that were
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* added or modified. If the return map is empty, then no properties
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* were modified.
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* @throws ContentIOException if a detectable error occurs
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*
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* @see #extract(ContentReader, OverwritePolicy, Map, Map)
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*/
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public Map<QName, Serializable> extract(
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ContentReader reader,
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OverwritePolicy overwritePolicy,
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Map<QName, Serializable> destination);
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/**
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* Extracts the metadata from the content provided by the reader and source
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* mimetype to the supplied map. The mapping from document metadata to system metadata
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* is explicitly provided. The {@link OverwritePolicy overwrite policy} is also explictly
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* set.
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* <p>
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* The extraction viability can be determined by an up front call to
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* {@link #isSupported(String)}.
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* <p>
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* The source mimetype <b>must</b> be available on the
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* {@link org.alfresco.service.cmr.repository.ContentAccessor#getMimetype()} method
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* of the reader.
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*
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* @param reader the source of the content
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* @param overwritePolicy the policy stipulating how the system properties must be
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* overwritten if present
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* @param destination the map of properties to populate (essentially a return value)
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* @param mapping a mapping of document-specific properties to system properties.
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* @return Returns a map of all properties on the destination map that were
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* added or modified. If the return map is empty, then no properties
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* were modified.
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* @throws ContentIOException if a detectable error occurs
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*
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* @see #extract(ContentReader, Map)
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*/
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public Map<QName, Serializable> extract(
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ContentReader reader,
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OverwritePolicy overwritePolicy,
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Map<QName, Serializable> destination,
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Map<String, Set<QName>> mapping);
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}
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