Java tutorial
/* * (C) Copyright 2014 Nuxeo SA (http://nuxeo.com/) and others. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Contributors: * Nicolas Chapurlat <nchapurlat@nuxeo.com> */ package org.nuxeo.ecm.directory; import java.io.IOException; import java.io.Serializable; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Locale; import java.util.Map; import org.apache.commons.lang.StringUtils; import org.nuxeo.ecm.core.api.DocumentModel; import org.nuxeo.ecm.core.schema.types.resolver.ObjectResolver; import org.nuxeo.ecm.directory.api.DirectoryEntry; import org.nuxeo.ecm.directory.api.DirectoryService; import org.nuxeo.runtime.api.Framework; /** * This {@link ObjectResolver} allows to manage integrity for fields containing references to directory's entry. * <p> * References contains the directory entry id. * </p> * <p> * To use it, put the following code in your schema XSD (don't forget the directory name): * </p> * * <pre> * {@code * <xs:element name="carBrand"> * <xs:simpleType> * <xs:restriction base="xs:string" ref:resolver="directoryResolver" ref:directory="carBrandsDirectory" /> * </xs:simpleType> * </xs:element> * </pre> * <p> * For hierarchical directories, which entries reference other entries. You can manage a specific reference containing * the full entry path. You have to specify the parent field and the separator used to encode the reference. * </p> * * <pre> * {@code * <xs:element name="coverage"> * <xs:simpleType> * <xs:restriction base="xs:string" ref:resolver="directoryResolver" ref:directory="l10ncoverage" ref:parentField="parent" ref:separator="/" /> * </xs:simpleType> * </xs:element> * </pre> * <p> * It's not necessary to define parentField and separator for directory using schema ending by xvocabulary. The feature * is automatically enable. * </p> * * @since 7.1 */ public class DirectoryEntryResolver implements ObjectResolver { private static final long serialVersionUID = 1L; public static final String NAME = "directoryResolver"; public static final String PARAM_DIRECTORY = "directory"; public static final String PARAM_PARENT_FIELD = "parentField"; public static final String PARAM_SEPARATOR = "separator"; private String idField; private String schema; private Map<String, Serializable> parameters; private boolean hierarchical = false; private String parentField = null; private String separator = null; private List<Class<?>> managedClasses = null; private String directoryName; /** * the directory is transient - it's refetched on read object - see {@link #readObject(java.io.ObjectInputStream)} */ private transient Directory directory; private transient DirectoryService directoryService; @Override public void configure(Map<String, String> parameters) throws IllegalArgumentException, IllegalStateException { if (this.parameters != null) { throw new IllegalStateException("cannot change configuration, may be already in use somewhere"); } directoryName = parameters.get(PARAM_DIRECTORY); if (directoryName != null) { directoryName = directoryName.trim(); } if (directoryName == null || directoryName.isEmpty()) { throw new IllegalArgumentException("missing directory parameter. A directory name is necessary"); } fetchDirectory(); idField = directory.getIdField(); schema = directory.getSchema(); if (schema.endsWith("xvocabulary")) { hierarchical = true; parentField = "parent"; separator = "/"; } String parentFieldParam = StringUtils.trim(parameters.get(PARAM_PARENT_FIELD)); String separatorParam = StringUtils.trim(parameters.get(PARAM_SEPARATOR)); if (!StringUtils.isBlank(parentFieldParam) && !StringUtils.isBlank(separatorParam)) { hierarchical = true; parentField = parentFieldParam; separator = separatorParam; } this.parameters = new HashMap<String, Serializable>(); this.parameters.put(PARAM_DIRECTORY, directory.getName()); } @Override public List<Class<?>> getManagedClasses() { if (managedClasses == null) { managedClasses = new ArrayList<Class<?>>(); managedClasses.add(DirectoryEntry.class); } return managedClasses; } private void fetchDirectory() { directory = getDirectoryService().getDirectory(directoryName); if (directory == null) { throw new IllegalArgumentException(String.format("the directory \"%s\" was not found", directoryName)); } } public DirectoryService getDirectoryService() { if (directoryService == null) { directoryService = Framework.getService(DirectoryService.class); } return directoryService; } public Directory getDirectory() { return directory; } public void setDirectory(Directory directory) { this.directory = directory; } @Override public String getName() { checkConfig(); return NAME; } @Override public Map<String, Serializable> getParameters() { checkConfig(); return Collections.unmodifiableMap(parameters); } @Override public boolean validate(Object value) throws IllegalStateException { checkConfig(); return fetch(value) != null; } @Override public Object fetch(Object value) throws IllegalStateException { checkConfig(); if (value != null && value instanceof String) { String id = (String) value; if (hierarchical) { String[] ids = StringUtils.split(id, separator); if (ids.length > 0) { id = ids[ids.length - 1]; } else { return null; } } try (Session session = directory.getSession()) { DocumentModel doc = session.getEntry(id); if (doc != null) { return new DirectoryEntry(directory.getName(), doc); } return null; } } return null; } @Override public <T> T fetch(Class<T> type, Object value) throws IllegalStateException { checkConfig(); DirectoryEntry doc = (DirectoryEntry) fetch(value); if (doc != null) { if (type.isInstance(doc)) { return type.cast(doc); } if (type.isInstance(doc.getDocumentModel())) { return type.cast(doc.getDocumentModel()); } } return null; } @Override public Serializable getReference(Object entity) throws IllegalStateException { checkConfig(); DocumentModel entry = null; if (entity != null) { if (entity instanceof DirectoryEntry) { entry = ((DirectoryEntry) entity).getDocumentModel(); } else if (entity instanceof DocumentModel) { entry = (DocumentModel) entity; } if (entry != null) { if (!entry.hasSchema(schema)) { return null; } String result = (String) entry.getProperty(schema, idField); if (hierarchical) { String parent = (String) entry.getProperty(schema, parentField); try (Session session = directory.getSession()) { while (parent != null) { entry = session.getEntry(parent); if (entry == null) { break; } result = parent + separator + result; parent = (String) entry.getProperty(schema, parentField); } } } return result; } } return null; } @Override public String getConstraintErrorMessage(Object invalidValue, Locale locale) { checkConfig(); return Helper.getConstraintErrorMessage(this, invalidValue, locale, directory.getName()); } private void checkConfig() throws IllegalStateException { if (parameters == null) { throw new IllegalStateException( "you should call #configure(Map<String, String>) before. Please get this resolver throught ExternalReferenceService which is in charge of resolver configuration."); } } /** * Refetch the directory which is transient. * * @since 7.10 */ private void readObject(java.io.ObjectInputStream stream) throws IOException, ClassNotFoundException { stream.defaultReadObject(); fetchDirectory(); } }