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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2005 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
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279
source/java/org/alfresco/repo/search/impl/NodeSearcher.java
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279
source/java/org/alfresco/repo/search/impl/NodeSearcher.java
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/*
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* Copyright (C) 2005 Alfresco, Inc.
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*
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* Licensed under the Mozilla Public License version 1.1
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* with a permitted attribution clause. You may obtain a
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* copy of the License at
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*
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* http://www.alfresco.org/legal/license.txt
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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* either express or implied. See the License for the specific
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* language governing permissions and limitations under the
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* License.
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*/
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package org.alfresco.repo.search.impl;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashSet;
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import java.util.List;
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import org.alfresco.repo.search.DocumentNavigator;
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import org.alfresco.repo.search.NodeServiceXPath;
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import org.alfresco.service.cmr.dictionary.DictionaryService;
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import org.alfresco.service.cmr.repository.ChildAssociationRef;
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import org.alfresco.service.cmr.repository.NodeRef;
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import org.alfresco.service.cmr.repository.NodeService;
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import org.alfresco.service.cmr.repository.XPathException;
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import org.alfresco.service.cmr.search.QueryParameterDefinition;
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import org.alfresco.service.cmr.search.SearchService;
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import org.alfresco.service.namespace.NamespacePrefixResolver;
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import org.alfresco.service.namespace.QName;
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import org.jaxen.JaxenException;
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/**
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* Helper class that walks a node hierarchy.
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* <p>
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* Some searcher methods on
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* {@link org.alfresco.service.cmr.search.SearchService} can use this directly
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* as its only dependencies are
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* {@link org.alfresco.service.cmr.repository.NodeService},
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* {@link org.alfresco.service.cmr.dictionary.DictionaryService} and a
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* {@link org.alfresco.service.cmr.search.SearchService}
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*
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* @author Derek Hulley
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*/
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public class NodeSearcher
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{
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private NodeService nodeService;
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private DictionaryService dictionaryService;
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private SearchService searchService;
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public NodeSearcher(NodeService nodeService, DictionaryService dictionaryService, SearchService searchService)
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{
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this.nodeService = nodeService;
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this.dictionaryService = dictionaryService;
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this.searchService = searchService;
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}
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/**
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* @see NodeServiceXPath
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*/
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public synchronized List<NodeRef> selectNodes(NodeRef contextNodeRef, String xpathIn,
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QueryParameterDefinition[] paramDefs, NamespacePrefixResolver namespacePrefixResolver,
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boolean followAllParentLinks, String language)
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{
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try
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{
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String xpath = xpathIn;
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boolean useJCRXPath = language.equalsIgnoreCase(SearchService.LANGUAGE_JCR_XPATH);
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List<AttributeOrder> order = null;
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// replace element
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if (useJCRXPath)
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{
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order = new ArrayList<AttributeOrder>();
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// We do not allow variable substitution with this pattern
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xpath = xpath.replaceAll("element\\(\\s*(\\*|\\w*:\\w*)\\s*,\\s*(\\*|\\w*:\\w*)\\s*\\)",
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"$1[subtypeOf(\"$2\")]");
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String split[] = xpath.split("order\\s*by\\s*", 2);
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xpath = split[0];
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if (split.length > 1 && split[1].length() > 0)
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{
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String clauses[] = split[1].split("\\s,\\s");
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for (String clause : clauses)
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{
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if (clause.startsWith("@"))
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{
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String attribute = clause.replaceFirst("@(\\p{Alpha}[\\w:]*)(?:\\s+(.*))?", "$1");
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String sort = clause.replaceFirst("@(\\p{Alpha}[\\w:]*)(?:\\s+(.*))?", "$2");
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if (sort.length() == 0)
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{
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sort = "ascending";
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}
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QName attributeQName = QName.createQName(attribute, namespacePrefixResolver);
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order.add(new AttributeOrder(attributeQName, sort.equalsIgnoreCase("ascending")));
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}
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else if (clause.startsWith("jcr:score"))
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{
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// ignore jcr:score ordering
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}
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else
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{
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throw new IllegalArgumentException("Malformed order by expression " + split[1]);
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}
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}
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}
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}
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DocumentNavigator documentNavigator = new DocumentNavigator(dictionaryService, nodeService, searchService,
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namespacePrefixResolver, followAllParentLinks, useJCRXPath);
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NodeServiceXPath nsXPath = new NodeServiceXPath(xpath, documentNavigator, paramDefs);
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for (String prefix : namespacePrefixResolver.getPrefixes())
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{
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nsXPath.addNamespace(prefix, namespacePrefixResolver.getNamespaceURI(prefix));
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}
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List list = nsXPath.selectNodes(nodeService.getPrimaryParent(contextNodeRef));
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HashSet<NodeRef> unique = new HashSet<NodeRef>(list.size());
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for (Object o : list)
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{
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if (o instanceof ChildAssociationRef)
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{
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unique.add(((ChildAssociationRef) o).getChildRef());
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}
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else if (o instanceof DocumentNavigator.Property)
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{
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unique.add(((DocumentNavigator.Property) o).parent);
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}
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else
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{
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throw new XPathException("Xpath expression must only select nodes");
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}
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}
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List<NodeRef> answer = new ArrayList<NodeRef>(unique.size());
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answer.addAll(unique);
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if (order != null)
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{
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orderNodes(answer, order);
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for(NodeRef node : answer)
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{
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StringBuffer buffer = new StringBuffer();
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for (AttributeOrder attOrd : order)
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{
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buffer.append(" ").append(nodeService.getProperty(node, attOrd.attribute));
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}
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System.out.println(buffer.toString());
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}
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System.out.println();
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}
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return answer;
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}
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catch (JaxenException e)
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{
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throw new XPathException("Error executing xpath: \n" + " xpath: " + xpathIn, e);
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}
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}
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private void orderNodes(List<NodeRef> answer, List<AttributeOrder> order)
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{
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Collections.sort(answer, new NodeRefComparator(nodeService, order));
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}
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static class NodeRefComparator implements Comparator<NodeRef>
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{
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List<AttributeOrder> order;
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NodeService nodeService;
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NodeRefComparator(NodeService nodeService, List<AttributeOrder> order)
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{
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this.nodeService = nodeService;
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this.order = order;
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}
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@SuppressWarnings("unchecked")
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public int compare(NodeRef n1, NodeRef n2)
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{
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for (AttributeOrder attributeOrder : order)
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{
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Serializable o1 = nodeService.getProperty(n1, attributeOrder.attribute);
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Serializable o2 = nodeService.getProperty(n2, attributeOrder.attribute);
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if (o1 == null)
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{
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if (o2 == null)
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{
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continue;
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}
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else
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{
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return attributeOrder.ascending ? -1 : 1;
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}
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}
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else
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{
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if (o2 == null)
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{
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return attributeOrder.ascending ? 1 : -1;
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}
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else
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{
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if ((o1 instanceof Comparable) && (o2 instanceof Comparable))
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{
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return (attributeOrder.ascending ? 1 : -1) * ((Comparable)o1).compareTo((Comparable) o2);
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}
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else
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{
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continue;
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}
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}
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}
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}
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return 0;
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}
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}
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/**
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* @see NodeServiceXPath
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*/
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public List<Serializable> selectProperties(NodeRef contextNodeRef, String xpath,
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QueryParameterDefinition[] paramDefs, NamespacePrefixResolver namespacePrefixResolver,
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boolean followAllParentLinks, String language)
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{
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try
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{
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boolean useJCRXPath = language.equalsIgnoreCase(SearchService.LANGUAGE_JCR_XPATH);
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DocumentNavigator documentNavigator = new DocumentNavigator(dictionaryService, nodeService, searchService,
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namespacePrefixResolver, followAllParentLinks, useJCRXPath);
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NodeServiceXPath nsXPath = new NodeServiceXPath(xpath, documentNavigator, paramDefs);
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for (String prefix : namespacePrefixResolver.getPrefixes())
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{
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nsXPath.addNamespace(prefix, namespacePrefixResolver.getNamespaceURI(prefix));
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}
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List list = nsXPath.selectNodes(nodeService.getPrimaryParent(contextNodeRef));
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List<Serializable> answer = new ArrayList<Serializable>(list.size());
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for (Object o : list)
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{
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if (!(o instanceof DocumentNavigator.Property))
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{
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throw new XPathException("Xpath expression must only select nodes");
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}
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answer.add(((DocumentNavigator.Property) o).value);
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}
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return answer;
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}
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catch (JaxenException e)
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{
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throw new XPathException("Error executing xpath", e);
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}
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}
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private static class AttributeOrder
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{
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QName attribute;
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boolean ascending;
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AttributeOrder(QName attribute, boolean ascending)
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{
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this.attribute = attribute;
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this.ascending = ascending;
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}
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}
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}
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