/** * Licensed to The Apereo Foundation under one or more contributor license * agreements. See the NOTICE file distributed with this work for additional * information regarding copyright ownership. * * * The Apereo Foundation licenses this file to you under the Educational * Community 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://opensource.org/licenses/ecl2.txt * * 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.opencastproject.assetmanager.impl.query; import org.opencastproject.assetmanager.api.query.Predicate; import org.opencastproject.assetmanager.impl.RuntimeTypes; import com.entwinemedia.fn.Fn2; import com.mysema.query.jpa.impl.JPAQueryFactory; import com.mysema.query.types.expr.BooleanExpression; public abstract class AbstractPredicate implements Predicate, QueryContributor { private final AbstractPredicate self = this; /** * Join two predicates by <code>op</code>. */ private Predicate binaryOp(final Predicate right, final Fn2<BooleanExpression, BooleanExpression, BooleanExpression> op) { return new AbstractPredicate() { @Override public SelectQueryContribution contributeSelect(JPAQueryFactory f) { final SelectQueryContribution cLeft = self.contributeSelect(f); final SelectQueryContribution cRight = RuntimeTypes.convert(right).contributeSelect(f); return SelectQueryContribution.mk() .from(cLeft.from.append(cRight.from)) .join(cLeft.join.append(cRight.join)) .where(JpaFns.op(op, cLeft.where, cRight.where)); } @Override public DeleteQueryContribution contributeDelete(String owner) { final DeleteQueryContribution cLeft = self.contributeDelete(owner); final DeleteQueryContribution cRight = RuntimeTypes.convert(right).contributeDelete(owner); return DeleteQueryContribution.mk() .from(cLeft.from.append(cRight.from)) .where(JpaFns.op(op, cLeft.where, cRight.where)); } }; } @Override public Predicate and(final Predicate right) { return binaryOp(right, JpaFns.and); } @Override public Predicate or(final Predicate right) { return binaryOp(right, JpaFns.or); } @Override public Predicate not() { return new AbstractPredicate() { @Override public SelectQueryContribution contributeSelect(JPAQueryFactory f) { final SelectQueryContribution c = self.contributeSelect(f); return SelectQueryContribution.mk().from(c.from).join(c.join).where(c.where.map(JpaFns.not)); } @Override public DeleteQueryContribution contributeDelete(String owner) { final DeleteQueryContribution c = self.contributeDelete(owner); return DeleteQueryContribution.mk().from(c.from).where(c.where.then(JpaFns.not)); } }; } }