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// $Id$
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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.strategy.merge;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Field;
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import java.lang.reflect.GenericDeclaration;
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import java.lang.reflect.Method;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.lang.reflect.TypeVariable;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.UUID;
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import org.apache.log4j.Logger;
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import eu.etaxonomy.cdm.common.CdmUtils;
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import eu.etaxonomy.cdm.model.common.CdmBase;
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import eu.etaxonomy.cdm.model.common.ICdmBase;
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import eu.etaxonomy.cdm.model.common.IRelated;
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import eu.etaxonomy.cdm.model.common.RelationshipBase;
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import eu.etaxonomy.cdm.strategy.StrategyBase;
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/**
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* @author a.mueller
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* @created 31.07.2009
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* @version 1.0
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*/
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public class DefaultMergeStrategy extends StrategyBase implements IMergeStrategy {
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private static final long serialVersionUID = -8513956338156791995L;
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private static final Logger logger = Logger.getLogger(DefaultMergeStrategy.class);
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final static UUID uuid = UUID.fromString("d85cd6c3-0147-452c-8fed-bbfb82f392f6");
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public static DefaultMergeStrategy NewInstance(Class<? extends CdmBase> mergeClazz){
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return new DefaultMergeStrategy(mergeClazz);
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}
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protected Map<String, MergeMode> mergeModeMap = new HashMap<String, MergeMode>();
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protected MergeMode defaultMergeMode = MergeMode.FIRST;
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protected MergeMode defaultCollectionMergeMode = MergeMode.ADD;
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protected Class<? extends CdmBase> mergeClass;
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protected Map<String, Field> mergeFields;
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protected DefaultMergeStrategy(Class<? extends CdmBase> mergeClazz) {
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super();
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if (mergeClazz == null){
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throw new IllegalArgumentException("Merge class must not be null");
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}
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this.mergeClass = mergeClazz;
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boolean includeStatic = false;
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boolean includeTransient = false;
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boolean makeAccessible = true;
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this.mergeFields = CdmUtils.getAllFields(mergeClass, CdmBase.class, includeStatic, includeTransient, makeAccessible, true);
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initMergeModeMap();
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}
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/**
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*
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*/
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private void initMergeModeMap() {
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for (Field field: mergeFields.values()){
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for (Annotation annotation : field.getAnnotations()){
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if (annotation.annotationType() == Merge.class){
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MergeMode mergeMode = ((Merge)annotation).value();
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mergeModeMap.put(field.getName(), mergeMode);
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}
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}
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}
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}
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/* (non-Javadoc)
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* @see eu.etaxonomy.cdm.strategy.StrategyBase#getUuid()
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*/
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@Override
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protected UUID getUuid() {
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return uuid;
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}
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/**
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* @return the merge class
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*/
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public Class<? extends CdmBase> getMergeClass() {
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return mergeClass;
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}
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/**
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* @param mergeClazz the mergeClazz to set
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*/
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public void setMergeClazz(Class<? extends CdmBase> mergeClazz) {
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this.mergeClass = mergeClazz;
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}
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/* (non-Javadoc)
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* @see eu.etaxonomy.cdm.strategy.merge.IMergeStragegy#getMergeMode(java.lang.String)
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*/
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public MergeMode getMergeMode(String propertyName){
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MergeMode result = mergeModeMap.get(propertyName);
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if (result == null){
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Field field = mergeFields.get(propertyName);
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if (isCollection(field.getType())){
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return defaultCollectionMergeMode;
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}else{
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return defaultMergeMode;
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}
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}else{
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return result;
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}
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}
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public void setMergeMode(String propertyName, MergeMode mergeMode) throws MergeException{
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if (mergeFields.containsKey(propertyName)){
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checkIdentifier(propertyName, mergeMode);
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mergeModeMap.put(propertyName, mergeMode);
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}else{
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throw new MergeException("The class " + mergeClass.getName() + " does not contain a field with name " + propertyName);
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}
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}
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/**
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* Tests if a property is an identifier property
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* @param propertyName
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* @param mergeMode
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* @throws MergeException
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*/
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private void checkIdentifier(String propertyName, MergeMode mergeMode) throws MergeException {
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if (mergeMode != MergeMode.FIRST){
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if ("id".equalsIgnoreCase(propertyName) || "uuid".equalsIgnoreCase(propertyName)){
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throw new MergeException("Identifier must always have merge mode MergeMode.FIRST");
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}
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}
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}
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public <T extends IMergable> Set<ICdmBase> invoke(T mergeFirst, T mergeSecond) throws MergeException {
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return this.invoke(mergeFirst, mergeSecond, null);
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}
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/* (non-Javadoc)
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* @see eu.etaxonomy.cdm.strategy.merge.IMergeStragegy#invoke(eu.etaxonomy.cdm.strategy.merge.IMergable, eu.etaxonomy.cdm.strategy.merge.IMergable)
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*/
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public <T extends IMergable> Set<ICdmBase> invoke(T mergeFirst, T mergeSecond, Set<ICdmBase> clonedObjects) throws MergeException {
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Set<ICdmBase> deleteSet = new HashSet<ICdmBase>();
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if (clonedObjects == null){
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clonedObjects = new HashSet<ICdmBase>();
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}
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deleteSet.add(mergeSecond);
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try {
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for (Field field : mergeFields.values()){
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Class<?> fieldType = field.getType();
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if (isIdentifier(field)){
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//do nothing (id and uuid stay with first object)
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}else if (isPrimitive(fieldType)){
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mergePrimitiveField(mergeFirst, mergeSecond, field);
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}else if (fieldType == String.class ){
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mergeStringField(mergeFirst, mergeSecond, field);
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}else if (isCollection(fieldType)){
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mergeCollectionField(mergeFirst, mergeSecond, field, deleteSet, clonedObjects);
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}else if(isUserType(fieldType)){
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mergeUserTypeField(mergeFirst, mergeSecond, field);
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}else if(isSingleCdmBaseObject(fieldType)){
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mergeSingleCdmBaseField(mergeFirst, mergeSecond, field, deleteSet);
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}else if(fieldType.isInterface()){
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mergeInterfaceField(mergeFirst, mergeSecond, field, deleteSet);
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}else if(fieldType.isEnum()){
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mergeEnumField(mergeFirst, mergeSecond, field, deleteSet);
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}else{
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throw new RuntimeException("Unknown Object type for merging: " + fieldType);
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}
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}
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return deleteSet;
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} catch (Exception e) {
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throw new MergeException("Merge Exception in invoke", e);
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}
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}
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/**
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* @throws Exception
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*
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*/
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private <T extends IMergable> void mergeInterfaceField(T mergeFirst, T mergeSecond, Field field, Set<ICdmBase> deleteSet) throws Exception {
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String propertyName = field.getName();
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MergeMode mergeMode = this.getMergeMode(propertyName);
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if (mergeMode != MergeMode.FIRST){
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mergeCdmBaseValue(mergeFirst, mergeSecond, field, deleteSet);
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}
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logger.debug(propertyName + ": " + mergeMode + ", " + field.getType().getName());
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}
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/**
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* @throws Exception
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*
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*/
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private <T extends IMergable> void mergeEnumField(T mergeFirst, T mergeSecond, Field field, Set<ICdmBase> deleteSet) throws Exception {
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String propertyName = field.getName();
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MergeMode mergeMode = this.getMergeMode(propertyName);
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if (mergeMode != MergeMode.FIRST){
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mergeCdmBaseValue(mergeFirst, mergeSecond, field, deleteSet);
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}
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logger.debug(propertyName + ": " + mergeMode + ", " + field.getType().getName());
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}
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/**
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* @throws Exception
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*
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*/
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private <T extends IMergable> void mergeSingleCdmBaseField(T mergeFirst, T mergeSecond, Field field, Set<ICdmBase> deleteSet) throws Exception {
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String propertyName = field.getName();
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MergeMode mergeMode = this.getMergeMode(propertyName);
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if (mergeMode != MergeMode.FIRST){
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mergeCdmBaseValue(mergeFirst, mergeSecond, field, deleteSet);
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}
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logger.debug(propertyName + ": " + mergeMode + ", " + field.getType().getName());
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}
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private <T extends IMergable> void mergeCdmBaseValue(T mergeFirst, T mergeSecond, Field field, Set<ICdmBase> deleteSet) throws Exception {
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if (true){
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Object value = getMergeValue(mergeFirst, mergeSecond, field);
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if (value instanceof ICdmBase || value == null){
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field.set(mergeFirst, (ICdmBase)value);
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}else{
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throw new MergeException("Merged value must be of type CdmBase but is not: " + value.getClass());
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}
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}else{
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throw new MergeException("Not supported mode");
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}
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}
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/**
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* @throws Exception
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*
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*/
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private <T extends IMergable> void mergeUserTypeField(T mergeFirst, T mergeSecond, Field field) throws Exception {
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String propertyName = field.getName();
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Class<?> fieldType = field.getType();
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MergeMode mergeMode = this.getMergeMode(propertyName);
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if (mergeMode == MergeMode.MERGE){
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Method mergeMethod = getMergeMethod(fieldType);
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Object firstObject = field.get(mergeFirst);
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if (firstObject == null){
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firstObject = fieldType.newInstance();
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}
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Object secondObject = field.get(mergeSecond);
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mergeMethod.invoke(firstObject, secondObject);
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}else if (mergeMode != MergeMode.FIRST){
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Object value = getMergeValue(mergeFirst, mergeSecond, field);
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field.set(mergeFirst, value);
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}
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logger.debug(propertyName + ": " + mergeMode + ", " + fieldType.getName());
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}
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/**
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* @return
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* @throws NoSuchMethodException
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* @throws SecurityException
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*/
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private Method getMergeMethod(Class<?> fieldType) throws SecurityException, NoSuchMethodException {
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Method mergeMethod = fieldType.getDeclaredMethod("merge", fieldType);
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return mergeMethod;
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}
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/**
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* @throws Exception
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*
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*/
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private <T extends IMergable> void mergeCollectionField(T mergeFirst, T mergeSecond, Field field, Set<ICdmBase> deleteSet, Set<ICdmBase> clonedObjects) throws Exception {
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String propertyName = field.getName();
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Class<?> fieldType = field.getType();
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MergeMode mergeMode = this.getMergeMode(propertyName);
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if (mergeMode != MergeMode.FIRST){
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mergeCollectionFieldNoFirst(mergeFirst, mergeSecond, field, mergeMode, deleteSet, clonedObjects);
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}
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logger.debug(propertyName + ": " + mergeMode + ", " + fieldType.getName());
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}
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private <T extends IMergable> void mergeCollectionFieldNoFirst(T mergeFirst, T mergeSecond, Field field, MergeMode mergeMode, Set<ICdmBase> deleteSet, Set<ICdmBase> clonedObjects) throws Exception{
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Class<?> fieldType = field.getType();
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if (mergeMode == MergeMode.ADD || mergeMode == MergeMode.ADD_CLONE){
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//FIXME
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Method addMethod = getAddMethod(field);
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Method removeMethod = getAddMethod(field, true);
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if (Set.class.isAssignableFrom(fieldType) || List.class.isAssignableFrom(fieldType)){
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Collection<ICdmBase> secondCollection = (Collection<ICdmBase>)field.get(mergeSecond);
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List<ICdmBase> removeList = new ArrayList<ICdmBase>();
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if(secondCollection != null) {
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for (ICdmBase obj : secondCollection){
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Object objectToAdd;
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if (mergeMode == MergeMode.ADD){
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objectToAdd = obj;
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}else if(mergeMode == MergeMode.ADD_CLONE){
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Method cloneMethod = obj.getClass().getDeclaredMethod("clone");
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objectToAdd = cloneMethod.invoke(obj);
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clonedObjects.add(obj);
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}else{
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throw new MergeException("Unknown collection merge mode: " + mergeMode);
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}
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addMethod.invoke(mergeFirst, objectToAdd);
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removeList.add(obj);
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}
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}
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for (ICdmBase removeObj : removeList ){
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//removeMethod.invoke(mergeSecond, removeObj);
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if ((removeObj instanceof CdmBase)&& mergeMode == MergeMode.ADD_CLONE) {
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deleteSet.add(removeObj);
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}
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}
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}else{
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throw new MergeException("Merge for collections other than sets and lists not yet implemented");
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}
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}else if (mergeMode == MergeMode.RELATION){
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if (Set.class.isAssignableFrom(fieldType) || List.class.isAssignableFrom(fieldType)){
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Collection<RelationshipBase<?,?,?>> secondCollection = (Collection<RelationshipBase<?,?,?>>)field.get(mergeSecond);
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List<ICdmBase> removeList = new ArrayList<ICdmBase>();
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for (RelationshipBase<?,?,?> relation : secondCollection){
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Method relatedFromMethod = RelationshipBase.class.getDeclaredMethod("getRelatedFrom");
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relatedFromMethod.setAccessible(true);
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Object relatedFrom = relatedFromMethod.invoke(relation);
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Method relatedToMethod = RelationshipBase.class.getDeclaredMethod("getRelatedTo");
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relatedToMethod.setAccessible(true);
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Object relatedTo = relatedToMethod.invoke(relation);
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if (relatedFrom.equals(mergeSecond)){
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Method setRelatedMethod = RelationshipBase.class.getDeclaredMethod("setRelatedFrom", IRelated.class);
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setRelatedMethod.setAccessible(true);
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setRelatedMethod.invoke(relation, mergeFirst);
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}
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if (relatedTo.equals(mergeSecond)){
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Method setRelatedMethod = RelationshipBase.class.getDeclaredMethod("setRelatedTo", IRelated.class);
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setRelatedMethod.setAccessible(true);
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setRelatedMethod.invoke(relation, mergeFirst);
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}
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364
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((IRelated)mergeFirst).addRelationship(relation);
|
|
365
|
removeList.add(relation);
|
|
366
|
}
|
|
367
|
for (ICdmBase removeObj : removeList){
|
|
368
|
//removeMethod.invoke(mergeSecond, removeObj);
|
|
369
|
if (removeObj instanceof CdmBase){
|
|
370
|
deleteSet.add(removeObj);
|
|
371
|
}
|
|
372
|
}
|
|
373
|
}else{
|
|
374
|
throw new MergeException("Merge for collections other than sets and lists not yet implemented");
|
|
375
|
}
|
|
376
|
}else{
|
|
377
|
throw new MergeException("Other merge modes for collections not yet implemented");
|
|
378
|
}
|
|
379
|
}
|
|
380
|
|
|
381
|
|
|
382
|
private Method getAddMethod(Field field) throws MergeException{
|
|
383
|
return getAddMethod(field, false);
|
|
384
|
}
|
|
385
|
|
|
386
|
public static Method getAddMethod(Field field, boolean remove) throws MergeException{
|
|
387
|
Method result;
|
|
388
|
Class parameterClass = getCollectionType(field);
|
|
389
|
String fieldName = field.getName();
|
|
390
|
String firstCapital = fieldName.substring(0, 1).toUpperCase();
|
|
391
|
String rest = fieldName.substring(1);
|
|
392
|
String prefix = remove? "remove": "add";
|
|
393
|
String methodName = prefix + firstCapital + rest;
|
|
394
|
boolean endsWithS = parameterClass.getSimpleName().endsWith("s");
|
|
395
|
if (! endsWithS && ! fieldName.equals("media")){
|
|
396
|
methodName = methodName.substring(0, methodName.length() -1); //remove 's' at end
|
|
397
|
}
|
|
398
|
Class<?> methodClass = field.getDeclaringClass();
|
|
399
|
try {
|
|
400
|
result = methodClass.getMethod(methodName, parameterClass);
|
|
401
|
}catch (NoSuchMethodException e1) {
|
|
402
|
try {
|
|
403
|
result = methodClass.getDeclaredMethod(methodName, parameterClass);
|
|
404
|
result.setAccessible(true);
|
|
405
|
} catch (NoSuchMethodException e) {
|
|
406
|
logger.warn(methodName);
|
|
407
|
throw new IllegalArgumentException("Default adding method for collection field ("+field.getName()+") does not exist");
|
|
408
|
}
|
|
409
|
} catch (SecurityException e) {
|
|
410
|
throw e;
|
|
411
|
}
|
|
412
|
return result;
|
|
413
|
}
|
|
414
|
|
|
415
|
/**
|
|
416
|
* @throws Exception
|
|
417
|
*
|
|
418
|
*/
|
|
419
|
private <T extends IMergable> void mergePrimitiveField(T mergeFirst, T mergeSecond, Field field) throws Exception {
|
|
420
|
String propertyName = field.getName();
|
|
421
|
Class<?> fieldType = field.getType();
|
|
422
|
MergeMode mergeMode = this.getMergeMode(propertyName);
|
|
423
|
if (mergeMode != MergeMode.FIRST){
|
|
424
|
Object value = getMergeValue(mergeFirst, mergeSecond, field);
|
|
425
|
field.set(mergeFirst, value);
|
|
426
|
}
|
|
427
|
logger.debug(propertyName + ": " + mergeMode + ", " + fieldType.getName());
|
|
428
|
|
|
429
|
}
|
|
430
|
|
|
431
|
/**
|
|
432
|
* @throws Exception
|
|
433
|
*
|
|
434
|
*/
|
|
435
|
private <T extends IMergable> void mergeStringField(T mergeFirst, T mergeSecond, Field field) throws Exception {
|
|
436
|
String propertyName = field.getName();
|
|
437
|
Class<?> fieldType = field.getType();
|
|
438
|
MergeMode mergeMode = this.getMergeMode(propertyName);
|
|
439
|
if (mergeMode != MergeMode.FIRST){
|
|
440
|
Object value = getMergeValue(mergeFirst, mergeSecond, field);
|
|
441
|
field.set(mergeFirst, value);
|
|
442
|
}
|
|
443
|
logger.debug(propertyName + ": " + mergeMode + ", " + fieldType.getName());
|
|
444
|
|
|
445
|
}
|
|
446
|
|
|
447
|
/**
|
|
448
|
* @param fieldType
|
|
449
|
* @return
|
|
450
|
*/
|
|
451
|
private boolean isIdentifier(Field field) {
|
|
452
|
Class<?> fieldType = field.getType();
|
|
453
|
if ("id".equals(field.getName()) && fieldType == int.class ){
|
|
454
|
return true;
|
|
455
|
}else if ("uuid".equals(field.getName()) && fieldType == UUID.class ){
|
|
456
|
return true;
|
|
457
|
}else{
|
|
458
|
return false;
|
|
459
|
}
|
|
460
|
}
|
|
461
|
|
|
462
|
|
|
463
|
/**
|
|
464
|
* @param cdmBase
|
|
465
|
* @param toMerge
|
|
466
|
* @param field
|
|
467
|
* @param mergeMode
|
|
468
|
* @throws Exception
|
|
469
|
*/
|
|
470
|
protected <T extends IMergable> Object getMergeValue(T mergeFirst, T mergeSecond,
|
|
471
|
Field field) throws Exception {
|
|
472
|
MergeMode mergeMode = this.getMergeMode(field.getName());
|
|
473
|
try {
|
|
474
|
if (mergeMode == MergeMode.FIRST){
|
|
475
|
return field.get(mergeFirst);
|
|
476
|
}else if (mergeMode == MergeMode.SECOND){
|
|
477
|
return field.get(mergeSecond);
|
|
478
|
}else if (mergeMode == MergeMode.NULL){
|
|
479
|
return null;
|
|
480
|
}else if (mergeMode == MergeMode.CONCAT){
|
|
481
|
return ((String)field.get(mergeFirst) + (String)field.get(mergeSecond));
|
|
482
|
}else if (mergeMode == MergeMode.AND){
|
|
483
|
return ((Boolean)field.get(mergeFirst) && (Boolean)field.get(mergeSecond));
|
|
484
|
}else if (mergeMode == MergeMode.OR){
|
|
485
|
return ((Boolean)field.get(mergeFirst) || (Boolean)field.get(mergeSecond));
|
|
486
|
}else{
|
|
487
|
throw new IllegalStateException("Unknown MergeMode");
|
|
488
|
}
|
|
489
|
} catch (IllegalArgumentException e) {
|
|
490
|
throw new Exception(e);
|
|
491
|
}
|
|
492
|
}
|
|
493
|
|
|
494
|
|
|
495
|
private static Class getCollectionType(Field field) throws MergeException{
|
|
496
|
Type genericType = (ParameterizedType)field.getGenericType();
|
|
497
|
if (genericType instanceof ParameterizedType/*Impl*/){
|
|
498
|
ParameterizedType paraType = (ParameterizedType)genericType;
|
|
499
|
Type rawType = paraType.getRawType();
|
|
500
|
Type[] arguments = paraType.getActualTypeArguments();
|
|
501
|
|
|
502
|
if (arguments.length == 1){
|
|
503
|
Class collectionClass;
|
|
504
|
if (arguments[0] instanceof Class){
|
|
505
|
collectionClass = (Class)arguments[0];
|
|
506
|
}else if(arguments[0] instanceof TypeVariable/*Impl*/){
|
|
507
|
TypeVariable typeVariable = (TypeVariable)arguments[0];
|
|
508
|
GenericDeclaration genericDeclaration = typeVariable.getGenericDeclaration();
|
|
509
|
collectionClass = (Class)genericDeclaration;
|
|
510
|
}else{
|
|
511
|
throw new MergeException("Collection with other types than TypeVariableImpl are not yet supported");
|
|
512
|
}
|
|
513
|
return collectionClass;
|
|
514
|
}else{
|
|
515
|
throw new MergeException("Collection with multiple types not supported");
|
|
516
|
}
|
|
517
|
}else{
|
|
518
|
throw new MergeException("Collection has no generic type of type ParameterizedTypeImpl. Unsupport case.");
|
|
519
|
}
|
|
520
|
}
|
|
521
|
|
|
522
|
|
|
523
|
|
|
524
|
}
|