
org.objectstyle.cayenne.access.DataContextQueryAction Maven / Gradle / Ivy
/* ====================================================================
*
* The ObjectStyle Group Software License, version 1.1
* ObjectStyle Group - http://objectstyle.org/
*
* Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
* of the software. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if any,
* must include the following acknowlegement:
* "This product includes software developed by independent contributors
* and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
* or promote products derived from this software without prior written
* permission. For written permission, email
* "andrus at objectstyle dot org".
*
* 5. Products derived from this software may not be called "ObjectStyle"
* or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
* names without prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals and hosted on ObjectStyle Group web site. For more
* information on the ObjectStyle Group, please see
* .
*/
package org.objectstyle.cayenne.access;
import java.util.List;
import org.objectstyle.cayenne.DataObject;
import org.objectstyle.cayenne.ObjectContext;
import org.objectstyle.cayenne.QueryResponse;
import org.objectstyle.cayenne.query.Query;
import org.objectstyle.cayenne.query.QueryMetadata;
import org.objectstyle.cayenne.query.ObjectIdQuery;
import org.objectstyle.cayenne.util.ListResponse;
import org.objectstyle.cayenne.util.ObjectContextQueryAction;
/**
* A DataContext-specific version of
* {@link org.objectstyle.cayenne.util.ObjectContextQueryAction}.
*
* @since 1.2
* @author Andrus Adamchik
*/
// TODO: Andrus, 2/2/2006 - all these DataContext extensions should become available to
// CayenneContext as well....
class DataContextQueryAction extends ObjectContextQueryAction {
public DataContextQueryAction(DataContext actingContext, ObjectContext targetContext,
Query query) {
super(actingContext, targetContext, query);
}
public QueryResponse execute() {
if (interceptPaginatedQuery() != DONE) {
if (interceptOIDQuery() != DONE) {
if (interceptRelationshipQuery() != DONE) {
if (interceptLocalCache() != DONE) {
runQuery();
}
}
}
}
interceptObjectConversion();
return response;
}
/**
* Overrides super implementation to property handle data row fetches.
*/
protected boolean interceptOIDQuery() {
if (query instanceof ObjectIdQuery) {
ObjectIdQuery oidQuery = (ObjectIdQuery) query;
if (!oidQuery.isFetchMandatory()) {
Object object = actingContext.getGraphManager().getNode(
oidQuery.getObjectId());
if (object != null) {
if (oidQuery.isFetchingDataRows()) {
object = ((DataContext) actingContext)
.currentSnapshot((DataObject) object);
}
this.response = new ListResponse(object);
return DONE;
}
}
}
return !DONE;
}
private boolean interceptPaginatedQuery() {
if (metadata.getPageSize() > 0) {
response = new ListResponse(new IncrementalFaultList(
(DataContext) actingContext,
query));
return DONE;
}
return !DONE;
}
/*
* Wraps execution in local cache checks.
*/
private boolean interceptLocalCache() {
String cacheKey = metadata.getCacheKey();
if (cacheKey == null) {
return !DONE;
}
boolean cache = QueryMetadata.LOCAL_CACHE.equals(metadata.getCachePolicy());
boolean cacheOrCacheRefresh = cache
|| QueryMetadata.LOCAL_CACHE_REFRESH.equals(metadata.getCachePolicy());
if (!cacheOrCacheRefresh) {
return !DONE;
}
ObjectStore objectStore = ((DataContext) actingContext).getObjectStore();
if (cache) {
List cachedResults = objectStore.getCachedQueryResult(cacheKey);
if (cachedResults != null) {
response = new ListResponse(cachedResults);
return DONE;
}
}
runQuery();
objectStore.cacheQueryResult(cacheKey, response.firstList());
return DONE;
}
}
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