/*
* 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.List;
import javax.persistence.EntityManager;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.juddi.query.util.DynamicQuery;
import org.apache.juddi.query.util.FindQualifiers;
import org.uddi.api_v3.TModelBag;
/**
* Returns the list of service keys with bindings that possess the tModels in the passed tModelBag.
* Output is restricted by list of service keys passed in. If null, all services are searched.
* Output is produced by building the appropriate JPA query based on input and find qualifiers.
*
* From specification:
* "Every Web service instance is represented in UDDI by a bindingTemplate contained within some businessService. A
* bindingTemplate contains a collection of tModel references called its "technical fingerprint" that specifies its type.
* The tModelBag argument is a collection of tModelKey values specifying that the search results are to be limited to
* businessServices containing bindingTemplates with technical fingerprints that match.
*
* If a find_tModel argument is specified (see below), it is treated as an embedded inquiry. The tModelKeys returned as a result
* of this embedded find_tModel argument are used as if they had been supplied in a tModelBag argument. Changing the order of
* the keys in the collection or specifying the same tModelKey more than once does not change the behavior of the find.
*
* By default, only bindingTemplates that contain all of the tModelKeys in the technical fingerprint match (logical AND). Specifying
* appropriate findQualifiers can override this behavior so that bindingTemplates containing any of the specified tModelKeys
* match (logical OR)."
*
* @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
* @author <a href="mailto:tcunning@apache.org">Tom Cunningham</a>
*/
public class FindServiceByTModelKeyQuery extends BusinessServiceQuery {
@SuppressWarnings("unused")
private static Log log = LogFactory.getLog(FindServiceByTModelKeyQuery.class);
public static final String ENTITY_NAME_CHILD = "TmodelInstanceInfo";
protected static final String entityAliasChild;
static {
entityAliasChild = buildAlias(ENTITY_NAME_CHILD); }
public static List<Object> select(EntityManager em, FindQualifiers fq, TModelBag tModels, String parentKey, List<Object> keysIn, DynamicQuery.Parameter... restrictions) {
// If keysIn is not null and empty, then search is over.
if ((keysIn != null) && (keysIn.isEmpty())) return keysIn; if (tModels == null) return keysIn; List<String> tmodelKeys = tModels.getTModelKey(); if (tmodelKeys == null || tmodelKeys.isEmpty()) return keysIn; DynamicQuery dynamicQry = new DynamicQuery(selectSQL); appendConditions(dynamicQry, fq, tmodelKeys); if (parentKey != null && parentKey.length() > 0) dynamicQry.AND().pad().appendGroupedAnd(new DynamicQuery.Parameter(BusinessServiceQuery.ENTITY_ALIAS + "." + BusinessServiceQuery.KEY_NAME_PARENT, parentKey, DynamicQuery.PREDICATE_EQUALS));
//dynamicQry.AND().pad().appendGroupedAnd(new DynamicQuery.Parameter(BindingTemplateQuery.ENTITY_ALIAS + "." + BindingTemplateQuery.KEY_NAME_PARENT, parentKey, DynamicQuery.PREDICATE_EQUALS));
if (restrictions != null && restrictions.length > 0) dynamicQry.AND().pad().appendGroupedAnd(restrictions); return getQueryResult(em, dynamicQry, keysIn, ENTITY_ALIAS + "." + KEY_NAME);
}
/*
* Appends the conditions to the query based on the tModelKey list. With the default or when "orAllKeys" is passed, the keyedReferences are autonomous and are
* all AND'd or OR'd respectively.
*
*/
public static void appendConditions(DynamicQuery qry, FindQualifiers fq, List<String> tmodelKeys) {
// Append the necessary tables (one will always be added connecting the entity to its instanceinfo table).
appendJoinTables(qry, fq, tmodelKeys); qry.AND().pad().openParen().pad(); int count = 0; int tblCount = -1; for(String tmodelKey : tmodelKeys) { tblCount++; String tmodelKeyTerm = (fq.isOrAllKeys()?entityAliasChild + "0":entityAliasChild + tblCount) + ".tmodelKey"; qry.appendGroupedAnd(new DynamicQuery.Parameter(tmodelKeyTerm, tmodelKey, DynamicQuery.PREDICATE_EQUALS)); if (count + 1 < tmodelKeys.size()) { if (fq.isOrAllKeys()) qry.OR().pad();
else
qry.AND().pad();
}
count++; } qry.closeParen().pad(); }
/*
* Appends the necessary join table for the child entity and additional tables for when keys are AND'd. This is the default behavior
* so only need to add additional tables if "orAllKeys" has not been set.
*/
public static void appendJoinTables(DynamicQuery qry, FindQualifiers fq, List<String> tmodelKeys) {
if (tmodelKeys != null && tmodelKeys.size() > 0) { qry.comma().pad().append(BindingTemplateQuery.ENTITY_NAME + " " + BindingTemplateQuery.ENTITY_ALIAS).pad(); StringBuilder thetaJoins = new StringBuilder(200); int tblCount = 0; for(int count = 0; count < tmodelKeys.size(); count++) { if (count != 0) { if (!fq.isOrAllKeys()) { tblCount++; qry.comma().pad().append(ENTITY_NAME_CHILD + " " + entityAliasChild + tblCount).pad(); thetaJoins.append(entityAliasChild).append(tblCount - 1).append("." + BindingTemplateQuery.ENTITY_FIELD + "." + BindingTemplateQuery.KEY_NAME + " = ").append(entityAliasChild).append(tblCount).append("." + BindingTemplateQuery.ENTITY_FIELD + "." + BindingTemplateQuery.KEY_NAME + " "); thetaJoins.append(DynamicQuery.OPERATOR_AND + " ");
}
}
else {
qry.comma().pad().append(ENTITY_NAME_CHILD + " " + entityAliasChild + tblCount).pad(); thetaJoins.append(BindingTemplateQuery.ENTITY_ALIAS + "." + BindingTemplateQuery.KEY_NAME + " = ").append(entityAliasChild).append(tblCount).append("." + BindingTemplateQuery.ENTITY_FIELD + "." + BindingTemplateQuery.KEY_NAME + " "); thetaJoins.append(DynamicQuery.OPERATOR_AND + " ");
}
}
qry.WHERE().pad().openParen().pad(); qry.append(ENTITY_ALIAS + "." + KEY_NAME + " = " + BindingTemplateQuery.ENTITY_ALIAS + "." + ENTITY_FIELD + "." + 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(BusinessServiceQuery.SIGNATURE_PRESENT).pad().closeParen().pad();
}
}
}
}