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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.match;
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import org.apache.log4j.Logger;
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import eu.etaxonomy.cdm.common.CdmUtils;
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/**
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* Enumeration for matching modes.
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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 enum MatchMode {
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EQUAL_REQUIRED, //parameters must be equal and not null
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EQUAL, //parameters must be equal or both null
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EQUAL_OR_ONE_NULL, //parameters must be equal at least one parameter is null
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EQUAL_OR_SECOND_NULL,
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IGNORE, //matches allways
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MATCH_REQUIRED,
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MATCH_OR_ONE_NULL,
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MATCH_OR_SECOND_NULL,
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MATCH,//matches if parameter mach (parameters must implement IMatchable)
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CACHE
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;
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private static final Logger logger = Logger.getLogger(MatchMode.class);
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public boolean matches(Object obj1, Object obj2, IMatchStrategy matchStrategy) throws MatchException{
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if (this == EQUAL_REQUIRED){
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return matchesEqualRequired(obj1, obj2);
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}else if(this == EQUAL){
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return matchesEqual(obj1, obj2);
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}else if (this == EQUAL_OR_ONE_NULL){
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return matchesEqualOrOneNull(obj1, obj2);
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}else if (this == EQUAL_OR_SECOND_NULL){
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return matchesEqualOrSecondNull(obj1, obj2);
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}else if(this == IGNORE){
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return matchesIgnore(obj1, obj2);
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}else if(this == MATCH){
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return matchesMatch(obj1, obj2, matchStrategy);
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}else if(this == MATCH_REQUIRED){
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return matchesMatchRequired(obj1, obj2, matchStrategy);
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}else if(this == MATCH_OR_ONE_NULL){
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return matchesMatchOrOneNull(obj1, obj2, matchStrategy);
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}else if(this == MATCH_OR_SECOND_NULL){
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return matchesMatchOrSecondNull(obj1, obj2, matchStrategy);
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}else if(this == CACHE){
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return matchesEqualRequired(obj1, obj2) && CdmUtils.isNotEmpty((String)obj1);
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}else {
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throw new MatchException("Match mode not handled yet: " + this);
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @param matchStrategy
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* @return
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* @throws MatchException
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*/
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private boolean matchesMatchRequired(Object obj1, Object obj2, IMatchStrategy matchStrategy) throws MatchException {
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if (obj1 == null || obj2 == null ){
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return false;
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}else if (! (obj1 instanceof IMatchable && obj2 instanceof IMatchable) ){
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logger.warn("Match objects are not of type IMatchable");
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return matchesEqualRequired(obj1, obj2);
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}else{
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if (matchStrategy == null){
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matchStrategy = DefaultMatchStrategy.NewInstance((Class<? extends IMatchable>) obj1.getClass());
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}
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return matchStrategy.invoke((IMatchable)obj1, (IMatchable)obj2);
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @return
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* @throws MatchException
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*/
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private boolean matchesMatchOrOneNull(Object obj1, Object obj2, IMatchStrategy matchStrategy) throws MatchException {
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if (obj1 == null || obj2 == null ){
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return true;
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}else {
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return matchesMatchRequired(obj1, obj2, matchStrategy);
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @return
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* @throws MatchException
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*/
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private boolean matchesMatchOrSecondNull(Object obj1, Object obj2, IMatchStrategy matchStrategy) throws MatchException {
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if (obj1 == null ){
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return true;
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}else {
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return matchesMatchRequired(obj1, obj2, matchStrategy);
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @param matchStrategy
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* @return
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* @throws MatchException
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*/
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private boolean matchesMatch(Object obj1, Object obj2, IMatchStrategy matchStrategy) throws MatchException {
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if (obj1 == null && obj2 == null ){
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return true;
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}else {
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return matchesMatchRequired(obj1, obj2, matchStrategy);
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @return
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*/
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private boolean matchesIgnore(Object obj1, Object obj2) {
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return true;
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}
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/**
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* @param obj1
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* @param obj2
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* @return
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*/
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private boolean matchesEqualRequired(Object obj1, Object obj2) {
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if (obj1 == null || obj2 == null || ! obj1.equals(obj2)){
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return false;
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}else{
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return true;
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @return
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*/
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private boolean matchesEqualOrOneNull(Object obj1, Object obj2) {
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if (obj1 == null || obj2 == null){
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return true;
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}else{
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return matchesEqualRequired(obj1, obj2);
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @return
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*/
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private boolean matchesEqualOrSecondNull(Object obj1, Object obj2) {
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if (obj2 == null){
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return true;
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}else{
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return matchesEqual(obj1, obj2);
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}
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}
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/**
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* @param obj1
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* @param obj2
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* @return
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*/
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private boolean matchesEqual(Object obj1, Object obj2) {
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if (obj1 == null && obj2 == null){
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return true;
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}else {
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return matchesEqualRequired(obj1, obj2);
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}
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}
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//not needed?
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public boolean allowsSecondNull(Object first){
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if (isRequired()){
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return false;
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}else if(first == null){
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return true;
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}else {
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return allowsExactlyOneNull();
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}
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}
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/**
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* Returns true is this match mode can be ignored for retrieving
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* matching objects
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* @param first
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* @return
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*/
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public boolean isIgnore(Object first){
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if (this == IGNORE){
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return true;
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}else if (first == null && (isXOrOneNull())){
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return true;
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}else{
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return false;
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}
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}
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/**
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* Returns true if a non-null value is required for finding
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* matching objects
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* @param first
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* @return
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*/
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public boolean requiresSecondValue(Object first){
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if (first == null){
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return false;
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}else{
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return ! allowsExactlyOneNull() ;
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}
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}
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/**
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* Returns true if a null value is required for retrieveing
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* matching objects
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* @param first
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* @return
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* @throws MatchException if first is null and matching a non-null value is required
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*/
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public boolean requiresSecondNull(Object first) throws MatchException{
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if (first != null){
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return false;
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}else if (isRequired()){
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throw new MatchException("MatchMode " + this + " does not allow (null)");
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}else{
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return ! isXOrOneNull();
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}
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}
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/**
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* Returns true if a non-null value is required, independent from the first value
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* @return
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*/
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public boolean isRequired(){
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return ((this == EQUAL_REQUIRED) || (this == MATCH_REQUIRED));
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}
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/**
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* Returns true, if this match mode allows that one value is null and the other is not null.
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* @return
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*/
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private boolean allowsExactlyOneNull(){
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return (isXOrOneNull() ||
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(this == EQUAL_OR_SECOND_NULL)|| (this == MATCH_OR_SECOND_NULL) ||
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(this == IGNORE));
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}
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/**
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* Returns true, if this match mode is of type MATCHXXX
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* @return
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*/
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public boolean isMatch(){
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return ((this == MATCH_REQUIRED) || (this == MATCH_OR_ONE_NULL) ||
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(this == MATCH)|| (this == MATCH_OR_SECOND_NULL) ||
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(this == MATCH_OR_ONE_NULL));
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}
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/**
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* Returns true, if this match mode is of type EQUALXXX
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* @return
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*/
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public boolean isEqual(){
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return ((this == EQUAL_REQUIRED) || (this == EQUAL_OR_ONE_NULL) ||
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(this == EQUAL)|| (this == EQUAL_OR_SECOND_NULL) ||
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(this == EQUAL_OR_ONE_NULL));
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}
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/**
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* Returns true, if this match mode is of type XXX_OR_ONE_NULL
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* @return
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*/
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public boolean isXOrOneNull(){
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return (this == EQUAL_OR_ONE_NULL) || (this == MATCH_OR_ONE_NULL);
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}
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}
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