/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.isis.core.runtime.system.persistence;
import java.util.Map;
import com.google.common.collect.Maps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.isis.applib.query.Query;
import org.apache.isis.applib.query.QueryDefault;
import org.apache.isis.applib.query.QueryFindAllInstances;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.metamodel.adapter.mgr.AdapterManager;
import org.apache.isis.core.metamodel.services.container.query.QueryCardinality;
import org.apache.isis.core.metamodel.services.container.query.QueryFindByPattern;
import org.apache.isis.core.metamodel.services.container.query.QueryFindByTitle;
import org.apache.isis.core.metamodel.spec.ObjectSpecification;
import org.apache.isis.core.metamodel.specloader.SpecificationLoader;
import org.apache.isis.core.runtime.persistence.query.*;
public class PersistenceQueryFactory {
private static final Logger LOG = LoggerFactory.getLogger(PersistenceQueryFactory.class);
private final SpecificationLoader specificationLoader;
private final AdapterManager adapterManager;
PersistenceQueryFactory(
final AdapterManager adapterManager,
final SpecificationLoader specificationLoader) {
this.specificationLoader = specificationLoader;
this.adapterManager = adapterManager;
}
/**
* Converts the {@link org.apache.isis.applib.query.Query applib representation of a query} into the
* {@link PersistenceQuery NOF-internal representation}.
*/
final PersistenceQuery createPersistenceQueryFor(final Query<?> query, final QueryCardinality cardinality) {
if (LOG.isDebugEnabled()) {
LOG.debug("createPersistenceQueryFor: " + query.getDescription());
}
final ObjectSpecification noSpec = specFor(query);
if (query instanceof QueryFindAllInstances) {
final QueryFindAllInstances<?> queryFindAllInstances = (QueryFindAllInstances<?>) query;
return new PersistenceQueryFindAllInstances(noSpec, specificationLoader, queryFindAllInstances.getStart(), queryFindAllInstances.getCount());
}
if (query instanceof QueryFindByTitle) {
final QueryFindByTitle<?> queryByTitle = (QueryFindByTitle<?>) query;
final String title = queryByTitle.getTitle();
return new PersistenceQueryFindByTitle(noSpec, title, specificationLoader, queryByTitle.getStart(), queryByTitle.getCount());
}
if (query instanceof QueryFindByPattern) {
final QueryFindByPattern<?> queryByPattern = (QueryFindByPattern<?>) query;
final Object pattern = queryByPattern.getPattern();
final ObjectAdapter patternAdapter = adapterManager.adapterFor(pattern);
return new PersistenceQueryFindByPattern(noSpec, patternAdapter, specificationLoader, queryByPattern.getStart(), queryByPattern.getCount());
}
if (query instanceof QueryDefault) {
final QueryDefault<?> queryDefault = (QueryDefault<?>) query;
final String queryName = queryDefault.getQueryName();
final Map<String, ObjectAdapter> argumentsAdaptersByParameterName = wrap(queryDefault.getArgumentsByParameterName());
return new PersistenceQueryFindUsingApplibQueryDefault(noSpec, queryName, argumentsAdaptersByParameterName, cardinality,
specificationLoader, queryDefault.getStart(), queryDefault.getCount());
}
// fallback; generic serializable applib query.
return new PersistenceQueryFindUsingApplibQuerySerializable(noSpec, query, cardinality, specificationLoader);
}
/**
* Converts a map of pojos keyed by string to a map of adapters keyed by the
* same strings.
*/
private Map<String, ObjectAdapter> wrap(final Map<String, Object> argumentsByParameterName) {
final Map<String, ObjectAdapter> argumentsAdaptersByParameterName = Maps.newHashMap();
for (final Map.Entry<String, Object> entry : argumentsByParameterName.entrySet()) {
final String parameterName = entry.getKey();
final Object argument = argumentsByParameterName.get(parameterName);
final ObjectAdapter argumentAdapter = argument != null ? adapterManager.adapterFor(argument) : null;
argumentsAdaptersByParameterName.put(parameterName, argumentAdapter);
}
return argumentsAdaptersByParameterName;
}
private ObjectSpecification specFor(final Query<?> query) {
return specificationLoader.loadSpecification(query.getResultType());
}
}