| /* |
| * 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.openjpa.persistence.criteria; |
| |
| import java.util.HashSet; |
| |
| import javax.persistence.criteria.CollectionJoin; |
| import javax.persistence.criteria.Fetch; |
| import javax.persistence.criteria.From; |
| import javax.persistence.criteria.Join; |
| import javax.persistence.criteria.JoinType; |
| import javax.persistence.criteria.ListJoin; |
| import javax.persistence.criteria.MapJoin; |
| import javax.persistence.criteria.SetJoin; |
| import javax.persistence.metamodel.Attribute; |
| import javax.persistence.metamodel.CollectionAttribute; |
| import javax.persistence.metamodel.ListAttribute; |
| import javax.persistence.metamodel.ManagedType; |
| import javax.persistence.metamodel.MapAttribute; |
| import javax.persistence.metamodel.PluralAttribute; |
| import javax.persistence.metamodel.SetAttribute; |
| import javax.persistence.metamodel.SingularAttribute; |
| import javax.persistence.metamodel.Type; |
| import javax.persistence.metamodel.Type.PersistenceType; |
| |
| import org.apache.openjpa.persistence.meta.AbstractManagedType; |
| import org.apache.openjpa.persistence.meta.Members; |
| |
| /** |
| * Represents a bound type, usually an entity that appears in the from clause, |
| * but may also be an embeddable belonging to an entity in the from clause. |
| * Serves as a factory for Joins of associations, embeddables and collections |
| * belonging to the type, and for Paths of attributes belonging to the type. |
| * |
| * @param <Z> the parent type of this receiver |
| * @param <X> the type represented by this receiver |
| */ |
| |
| class FromImpl<Z,X> extends PathImpl<Z,X> implements From<Z,X> { |
| private java.util.Set<Join<X, ?>> _joins; |
| private java.util.Set<Fetch<X, ?>> _fetches; |
| private Type<X> type; |
| |
| /** |
| * Supply the non-null managed type. |
| */ |
| protected FromImpl(AbstractManagedType<X> type) { |
| super(type.getJavaType()); |
| this.type = type; |
| } |
| |
| protected FromImpl(PathImpl<?,Z> parent, Members.Member<? super Z, ?> m, Class<X> x) { |
| super(parent, m, x); |
| this.type = (Type<X>)m.getType(); |
| } |
| |
| @Override |
| public Type<?> getType() { |
| return type; |
| } |
| |
| /** |
| * Return the joins that have been made from this receiver. |
| */ |
| @Override |
| public java.util.Set<Join<X, ?>> getJoins() { |
| return Expressions.returnCopy(_joins); |
| } |
| |
| /** |
| * Join to the given attribute using an inner join. |
| */ |
| @Override |
| public <Y> Join<X, Y> join(SingularAttribute<? super X, Y> attribute) { |
| return join(attribute, JoinType.INNER); |
| } |
| |
| /** |
| * Join to the given attribute using the given join type. |
| */ |
| @Override |
| public <Y> Join<X, Y> join(SingularAttribute<? super X, Y> attribute, JoinType jt) { |
| Join<X, Y> join = new Joins.SingularJoin<>(this, |
| (Members.SingularAttributeImpl<? super X, Y>) attribute, jt); |
| addJoin(join); |
| |
| return join; |
| } |
| |
| /** |
| * Join to the given Collection-valued attribute using an inner join. |
| */ |
| @Override |
| public <Y> CollectionJoin<X, Y> join(CollectionAttribute<? super X, Y> collection) { |
| return join(collection, JoinType.INNER); |
| } |
| |
| /** |
| * Join to the given Collection-valued attribute using the given |
| * join type. |
| */ |
| @Override |
| public <Y> CollectionJoin<X, Y> join(CollectionAttribute<? super X, Y> collection, |
| JoinType jt) { |
| CollectionJoin<X, Y> join = new Joins.Collection<>(this, |
| (Members.CollectionAttributeImpl<? super X, Y>)collection, jt); |
| addJoin(join); |
| |
| return join; |
| } |
| |
| /** |
| * Join to the given Set-valued attribute using an inner join. |
| */ |
| @Override |
| public <Y> SetJoin<X,Y> join(SetAttribute<? super X, Y> set) { |
| return join(set, JoinType.INNER); |
| } |
| |
| /** |
| * Join to the given Set-valued attribute using the given join type. |
| */ |
| @Override |
| public <Y> SetJoin<X,Y> join(SetAttribute<? super X, Y> set, JoinType jt) { |
| SetJoin<X, Y> join = new Joins.Set<>(this, (Members.SetAttributeImpl<? super X, Y>)set, jt); |
| addJoin(join); |
| return join; |
| } |
| |
| /** |
| * Join to the given List-valued attribute using an inner join. |
| */ |
| @Override |
| public <Y> ListJoin<X,Y> join(ListAttribute<? super X, Y> list) { |
| return join(list, JoinType.INNER); |
| } |
| |
| /** |
| * Join to the given List-valued attribute using the given join type. |
| */ |
| @Override |
| public <Y> ListJoin<X,Y> join(ListAttribute<? super X, Y> list, JoinType jt) { |
| ListJoin<X, Y> join = new Joins.List<>(this, (Members.ListAttributeImpl<? super X, Y>)list, jt); |
| addJoin(join); |
| return join; |
| } |
| |
| /** |
| * Join to the given Map-valued attribute using an inner join. |
| */ |
| @Override |
| public <K,V> MapJoin<X,K,V> join(MapAttribute<? super X,K,V> map) { |
| return join(map, JoinType.INNER); |
| } |
| |
| /** |
| * Join to the given Map-valued attribute using the given join type. |
| */ |
| @Override |
| public <K,V> MapJoin<X,K,V> join(MapAttribute<? super X,K,V> map, JoinType jt) { |
| MapJoin<X,K,V> join = new Joins.Map<>(this, (Members.MapAttributeImpl<? super X,K,V>)map, jt); |
| addJoin(join); |
| return join; |
| } |
| |
| // String based counterparts |
| |
| @Override |
| public <W,Y> Join<W,Y> join(String attr) { |
| return join(attr, JoinType.INNER); |
| } |
| |
| @Override |
| public <W,Y> Join<W,Y> join(String name, JoinType jt) { |
| assertJoinable(type); |
| ManagedType<X> mType = (ManagedType<X>)type; |
| Attribute<?, ?> attr = mType.getAttribute(name); |
| assertJoinable(attr.getDeclaringType()); |
| if (attr instanceof SingularAttribute) { |
| return join((SingularAttribute)attr, jt); |
| } else if (attr instanceof ListAttribute) { |
| return join((ListAttribute)attr, jt); |
| } else if (attr instanceof SetAttribute) { |
| return join((SetAttribute)attr, jt); |
| } else if (attr instanceof CollectionAttribute) { |
| return join((CollectionAttribute)attr, jt); |
| } else if (attr instanceof MapAttribute) { |
| return join((MapAttribute)attr, jt); |
| } else { |
| throw new IllegalArgumentException(name); |
| } |
| } |
| |
| |
| @Override |
| public <W,Y> CollectionJoin<W, Y> joinCollection(String attr) { |
| assertJoinable(type); |
| return (CollectionJoin<W,Y>)join(((ManagedType<X>)type).getCollection(attr), JoinType.INNER); |
| } |
| |
| @Override |
| public <W,Y> CollectionJoin<W, Y> joinCollection(String attr, JoinType jt) { |
| assertJoinable(type); |
| return (CollectionJoin<W,Y>)join(((ManagedType<X>)type).getCollection(attr), jt); |
| } |
| |
| @Override |
| public <W,Y> ListJoin<W, Y> joinList(String attr) { |
| assertJoinable(type); |
| return (ListJoin<W,Y>)join(((ManagedType<X>)type).getList(attr), JoinType.INNER); |
| } |
| |
| @Override |
| public <W,Y> ListJoin<W,Y> joinList(String attr, JoinType jt) { |
| assertJoinable(type); |
| return (ListJoin<W,Y>)join(((ManagedType<X>)type).getList(attr), jt); |
| } |
| |
| @Override |
| public <W,K,V> MapJoin<W,K,V> joinMap(String attr) { |
| assertJoinable(type); |
| return (MapJoin<W,K,V>)join(((ManagedType<X>)type).getMap(attr)); |
| } |
| |
| @Override |
| public <W,K,V> MapJoin<W,K,V> joinMap(String attr, JoinType jt) { |
| assertJoinable(type); |
| return (MapJoin<W,K,V>)join(((ManagedType<X>)type).getMap(attr)); |
| } |
| |
| @Override |
| public <W,Y> SetJoin<W, Y> joinSet(String attr) { |
| assertJoinable(type); |
| return (SetJoin<W, Y>)join(((ManagedType<X>)type).getSet(attr)); |
| } |
| |
| @Override |
| public <W,Y> SetJoin<W, Y> joinSet(String attr, JoinType jt) { |
| assertJoinable(type); |
| return (SetJoin<W, Y>)join(((ManagedType<X>)type).getSet(attr), jt); |
| } |
| |
| void assertJoinable(Type<?> type) { |
| if (type.getPersistenceType() == PersistenceType.BASIC) { |
| throw new IllegalArgumentException(this + " is a basic path and can not be navigated to "); |
| } |
| } |
| |
| private void addJoin(Join<X,?> join) { |
| if (_joins == null) |
| _joins = new HashSet<>(); |
| _joins.add(join); |
| } |
| |
| |
| @Override |
| public <Y> Fetch<X, Y> fetch(SingularAttribute<? super X, Y> assoc, JoinType jt) { |
| return addFetch((Members.Member<? super X, Y>)assoc, jt); |
| } |
| |
| @Override |
| public <Y> Fetch<X,Y> fetch(SingularAttribute<? super X, Y> assoc) { |
| return fetch(assoc, JoinType.INNER); |
| } |
| |
| @Override |
| public <Y> Fetch<X, Y> fetch(PluralAttribute<? super X, ?, Y> assoc, |
| JoinType jt) { |
| return addFetch((Members.Member<? super X, Y>)assoc, jt); |
| } |
| |
| @Override |
| public <Y> Fetch<X,Y> fetch(PluralAttribute<? super X, ?, Y> assoc) { |
| return fetch(assoc, JoinType.INNER); |
| } |
| |
| //String-based: |
| |
| @Override |
| public <X,Y> Fetch<X, Y> fetch(String assocName) { |
| return fetch(assocName, JoinType.INNER); |
| } |
| |
| @Override |
| public <X,Y> Fetch<X, Y> fetch(String name, JoinType jt) { |
| assertJoinable(type); |
| Attribute<? super X,?> attr = ((ManagedType<X>)type).getAttribute(name); |
| if (attr.isCollection()) { |
| return fetch((PluralAttribute)attr, jt); |
| } else { |
| return fetch(((SingularAttribute)attr), jt); |
| } |
| } |
| |
| @Override |
| public java.util.Set<Fetch<X, ?>> getFetches() { |
| return Expressions.returnCopy(_fetches); |
| } |
| |
| private <Y> Fetch<X,Y> addFetch(Members.Member<? super X, Y> member, |
| JoinType jt) { |
| Fetch<X,Y> fetch = new FetchPathImpl(this, member, jt); |
| if (_fetches == null) |
| _fetches = new HashSet<>(); |
| _fetches.add(fetch); |
| return fetch; |
| } |
| |
| @Override |
| public void acceptVisit(CriteriaExpressionVisitor visitor) { |
| Expressions.acceptVisit(visitor, this, |
| _joins == null ? null : _joins.toArray(new ExpressionImpl<?>[_joins.size()])); |
| } |
| |
| @Override |
| public From<Z,X> getCorrelationParent() { |
| return (From<Z,X>)getCorrelatedPath(); |
| } |
| } |