/*
* Copyright 2011, Mysema Ltd
*
* 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 com.mysema.query.jpa;
import javax.persistence.Entity;
import java.util.UUID;
import com.mysema.query.support.CollectionAnyVisitor;
import com.mysema.query.support.Context;
import com.mysema.query.types.*;
import com.mysema.query.types.path.EntityPathBase;
import com.mysema.query.types.path.ListPath;
import com.mysema.query.types.path.SimplePath;
/**
* JPACollectionAnyVisitor extends the {@link CollectionAnyVisitor} class with module specific
* extensions
*
* @author tiwe
*
*/
public final class JPACollectionAnyVisitor extends CollectionAnyVisitor {
public static final JPACollectionAnyVisitor DEFAULT = new JPACollectionAnyVisitor();
@SuppressWarnings("unchecked")
@Override
protected Predicate exists(Context c, Predicate condition) {
JPASubQuery query = new JPASubQuery();
for (int i = 0; i < c.paths.size(); i++) {
Path<?> child = c.paths.get(i).getMetadata().getParent();
EntityPath<Object> replacement = (EntityPath<Object>) c.replacements.get(i);
if (c.paths.get(i).getType().isAnnotationPresent(Entity.class)) {
query.from(new ListPath(c.paths.get(i).getType(), SimplePath.class, child.getMetadata()), replacement);
} else {
// join via parent
Path<?> parent = child.getMetadata().getParent();
String prefix = parent.accept(ToStringVisitor.DEFAULT, TEMPLATES).replace('.', '_');
String suffix = UUID.randomUUID().toString().replace("-", "").substring(0,5);
EntityPathBase<Object> newParent = new EntityPathBase<Object>(parent.getType(), prefix + suffix);
EntityPath<Object> newChild = new EntityPathBase<Object>(child.getType(),
PathMetadataFactory.forProperty(newParent, child.getMetadata().getName()));
query.from(newParent).innerJoin(newChild, replacement);
query.where(ExpressionUtils.eq(newParent, parent));
}
}
c.clear();
query.where(condition);
return query.exists();
}
private JPACollectionAnyVisitor() {}
}