/*
* Copyright 2001-2008 The Apache Software Foundation.
*
* 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.
*
*/
package org.apache.juddi.query;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.persistence.EntityManager;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.juddi.config.Constants;
import org.apache.juddi.query.util.DynamicQuery;
import org.apache.juddi.query.util.FindQualifiers;
import org.apache.juddi.query.util.KeyedRefTModelComparator;
import org.uddi.api_v3.CategoryBag;
import org.uddi.api_v3.KeyedReference;
/**
* Returns the list of "entity" keys possessing the keyedReferences in the passed category bag.
* Output is restricted by list of "entity" keys passed in. If null, all entities are searched.
* Output is produced by building the appropriate JPA query based on input and find qualifiers.
*
* NOTES:
* 1) Categories are grouped with a logical AND by default.
* 2) Concerning when the categories are AND'd together - the only way this can be done with a single query was to create a self-join for
* each category. If there are a lot of categories, the performance could suffer.
* TODO: Test performance with multiple AND'd categories. If too slow, look to process this query in multiple steps.
* 3) The "orLikeKeys" qualifier complicates matters. The "like" keys are OR'd together and these groups of "like" keys are AND'd together.
* As with "andAllKeys", self-joins are created but only one for each group of "like" keys. If none of the keyedReferences passed are alike then this
* will reduce to an "andAllKeys" query. If all are alike, then this will query will exhibit the behavior of OR'ing all keys.
*
* @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
*/
public class FindEntityByCategoryQuery extends EntityQuery {
@SuppressWarnings("unused")
private final static Log log = LogFactory.getLog(FindEntityByCategoryQuery.class);
private static final String ENTITY_KEYEDREFERENCE = "KeyedReference";
private static final String ALIAS_KEYEDREFERENCE = buildAlias(ENTITY_KEYEDREFERENCE);
private static final String FIELD_CATEGORYBAG = "categoryBag";
protected String entityName;
protected String entityAlias;
protected String keyName;
protected String entityField;
protected String entityNameChild;
protected String entityAliasChild;
protected String selectSQL;
protected String signaturePresent;
public FindEntityByCategoryQuery(String entityName, String entityAlias, String keyName,
String entityField, String entityNameChild, String signaturePresent) { this.entityName = entityName; this.entityAlias = entityAlias; this.keyName = keyName; this.entityField = entityField; this.entityNameChild = entityNameChild; this.entityAliasChild = buildAlias(entityNameChild); this.signaturePresent = signaturePresent; StringBuffer sql = new StringBuffer(200); sql.append("select distinct " + entityAlias + "." + keyName + " from " + entityName + " " + entityAlias + " , " + entityNameChild + " " + entityAliasChild + " "); selectSQL = sql.toString(); }
public String getEntityName() {
return entityName;
}
public String getEntityAlias() {
return entityAlias;
}
public String getKeyName() {
return keyName;
}
public String getEntityField() {
return entityField;
}
public String getEntityNameChild() {
return entityNameChild;
}
public String getEntityAliasChild() {
return entityAliasChild;
}
public String getSelectSQL() {
return selectSQL;
}
public String getSignaturePresent() {
return signaturePresent;
}
public void setSignaturePresent(String signaturePresent) {
this.signaturePresent = signaturePresent; }
public List<Object> select(EntityManager em, FindQualifiers fq, CategoryBag categoryBag, List<Object> keysIn, DynamicQuery.Parameter... restrictions) {
// If keysIn is not null and empty, then search is over.
if ((keysIn != null) && (keysIn.size() == 0)) return keysIn; if (categoryBag == null) return keysIn; List<KeyedReference> categories = categoryBag.getKeyedReference(); if (categories == null || categories.size() == 0) return keysIn; List<KeyedReference> keyedRefs = new ArrayList<KeyedReference>(0); for (KeyedReference elem : categories) { if (elem instanceof KeyedReference) keyedRefs.add((KeyedReference)elem); } if (keyedRefs.isEmpty()) return keysIn; DynamicQuery dynamicQry = new DynamicQuery(selectSQL); appendConditions(dynamicQry, fq, keyedRefs); if (restrictions != null && restrictions.length > 0) dynamicQry.AND().pad().appendGroupedAnd(restrictions); return getQueryResult(em, dynamicQry, keysIn, entityAlias + "." + keyName);
}
/*
* Appends the conditions to the query based on the keyedReference list. With the default or when "orAllKeys" is passed, the keyedReferences are autonomous and are
* all AND'd or OR'd respectively. However, "orLikeKeys" requires special treatment. The goal is to create the conditions in this format:
*
* (likeKey1 = X or likeKey1 = Y) and (likeKey2 = A or likeKey2 = B or likeKey2 = C)
*
* ie. the "like" KeyedReferences are OR'd and the groups of "like" KeyedReferences are AND'd with each other.
*/
public void appendConditions(DynamicQuery qry, FindQualifiers fq, List<KeyedReference> keyedRefs) {
// Append the necessary tables (two will always be added connecting the entity to its category table and then the category table to the keyed references).
appendJoinTables(qry, fq, keyedRefs); qry.AND().pad().openParen().pad(); String predicate = DynamicQuery.PREDICATE_EQUALS; if (fq.isApproximateMatch()) { predicate = DynamicQuery.PREDICATE_LIKE;
}
// Sorting the collection by tModel Key
Collections.sort(keyedRefs, new KeyedRefTModelComparator()); String prevTModelKey = null; int count = 0; int tblCount = -1; for(KeyedReference keyedRef : keyedRefs) { String tmodelKey = keyedRef.getTModelKey(); String keyValue = keyedRef.getKeyValue(); String keyName = keyedRef.getKeyName(); if (fq.isApproximateMatch()) {
// JUDDI-235: wildcards are provided by user (only commenting in case a new interpretation arises)
//keyValue = keyValue.endsWith(DynamicQuery.WILDCARD)?keyValue:keyValue + DynamicQuery.WILDCARD;
//keyName = keyName.endsWith(DynamicQuery.WILDCARD)?keyName:keyName + DynamicQuery.WILDCARD;
}
// Either opening up (and AND'ing) a new "group" of like keys or simply appending an "or". If this is not "orLikeKeys", then just need to increment
// the table count.
if (fq.isOrLikeKeys()) { if (count == 0) { qry.openParen().pad(); tblCount++;
}
else {
if (!tmodelKey.equals(prevTModelKey)) { qry.closeParen().pad().AND().pad().openParen().pad(); tblCount++;
}
else
qry.OR().pad();
}
}
else
tblCount++; String keyValueTerm = (fq.isOrAllKeys()?ALIAS_KEYEDREFERENCE + "0":ALIAS_KEYEDREFERENCE + tblCount) + ".keyValue"; String keyNameTerm = (fq.isOrAllKeys()?ALIAS_KEYEDREFERENCE + "0":ALIAS_KEYEDREFERENCE + tblCount) + ".keyName"; String tmodelKeyTerm = (fq.isOrAllKeys()?ALIAS_KEYEDREFERENCE + "0":ALIAS_KEYEDREFERENCE + tblCount) + ".tmodelKeyRef"; if (fq.isCaseInsensitiveMatch()) { keyValueTerm = "upper(" + keyValueTerm + ")"; keyValue = keyValue.toUpperCase(); keyNameTerm = "upper(" + keyNameTerm + ")"; keyName = keyName.toUpperCase();
}
// According to specification, if the "general keyword" tmodel is used, then the keyName must be part of the query.
if (Constants.GENERAL_KEYWORD_TMODEL.equalsIgnoreCase(tmodelKey)) { qry.appendGroupedAnd(new DynamicQuery.Parameter(tmodelKeyTerm, tmodelKey, DynamicQuery.PREDICATE_EQUALS),
new DynamicQuery.Parameter(keyValueTerm, keyValue, predicate),
new DynamicQuery.Parameter(keyNameTerm, keyName, predicate));
}
else {
qry.appendGroupedAnd(new DynamicQuery.Parameter(tmodelKeyTerm, tmodelKey, DynamicQuery.PREDICATE_EQUALS),
new DynamicQuery.Parameter(keyValueTerm, keyValue, predicate));
}
if (count + 1 < keyedRefs.size()) { if (fq.isOrAllKeys()) qry.OR().pad(); else if (fq.isOrLikeKeys()) {
}
else
qry.AND().pad();
}
// The "orLikeKeys" will always leave an unclosed parenthesis. This will close it.
if (fq.isOrLikeKeys() && (count + 1 == keyedRefs.size())) qry.closeParen().pad(); prevTModelKey = tmodelKey; count++; } qry.closeParen().pad(); }
/*
* Appends the necessary join table for the child entity and additional tables for when keys are AND'd. When "orLikeKeys" is used,
* we only need an extra table for each distinct tmodelKey.
*/
public void appendJoinTables(DynamicQuery qry, FindQualifiers fq, List<KeyedReference> keyedRefs) {
if (keyedRefs != null && keyedRefs.size() > 0) {
// Sorting the collection by tModel Key
Collections.sort(keyedRefs, new KeyedRefTModelComparator()); StringBuffer thetaJoins = new StringBuffer(200); int tblCount = 0; int count = 0; String curTModelKey = null; String prevTModelKey = null; for(KeyedReference kr : keyedRefs) { curTModelKey = kr.getTModelKey(); if (count != 0) { if (!fq.isOrAllKeys()) { if (fq.isOrLikeKeys() && curTModelKey.equals(prevTModelKey)) {
// Do nothing
}
else {
tblCount++; qry.comma().pad().append(ENTITY_KEYEDREFERENCE + " " + ALIAS_KEYEDREFERENCE + tblCount).pad(); thetaJoins.append(ALIAS_KEYEDREFERENCE + (tblCount - 1) + "." + FIELD_CATEGORYBAG + ".id = " + ALIAS_KEYEDREFERENCE + tblCount + "." + FIELD_CATEGORYBAG + ".id "); thetaJoins.append(DynamicQuery.OPERATOR_AND + " ");
}
}
}
else {
qry.comma().pad().append(ENTITY_KEYEDREFERENCE + " " + ALIAS_KEYEDREFERENCE + tblCount).pad(); thetaJoins.append(entityAliasChild + ".id = " + ALIAS_KEYEDREFERENCE + tblCount + "." + FIELD_CATEGORYBAG + ".id "); thetaJoins.append(DynamicQuery.OPERATOR_AND + " ");
}
prevTModelKey = curTModelKey; count++; } qry.WHERE().pad().openParen().pad();
// Appending the middling entity-specific category table condition
qry.append(entityAlias + "." + keyName + " = " + entityAliasChild + "." + entityField + "." + KEY_NAME).pad(); qry.AND().pad(); String thetaJoinsStr = thetaJoins.toString(); if (thetaJoinsStr.endsWith(DynamicQuery.OPERATOR_AND + " ")) thetaJoinsStr = thetaJoinsStr.substring(0, thetaJoinsStr.length() - (DynamicQuery.OPERATOR_AND + " ").length()); qry.append(thetaJoinsStr); qry.closeParen().pad(); if (fq!=null && fq.isSignaturePresent()) { qry.AND().pad().openParen().pad().append(getSignaturePresent()).pad().closeParen().pad();
}
}
}
}