| /* |
| * 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.jdbc.sql; |
| |
| import org.apache.openjpa.jdbc.meta.ClassMapping; |
| import org.apache.openjpa.jdbc.schema.ForeignKey; |
| import org.apache.openjpa.jdbc.schema.Table; |
| |
| /** |
| * Represents a SQL join. |
| * |
| * @author Abe White |
| */ |
| public class Join |
| implements Cloneable, JoinSyntaxes { |
| |
| public static final int TYPE_INNER = 0; |
| public static final int TYPE_OUTER = 1; |
| public static final int TYPE_CROSS = 2; |
| |
| private int _type = TYPE_INNER; |
| |
| private int _alias1; |
| private int _alias2; |
| private Table _table1; |
| private Table _table2; |
| private ForeignKey _fk; |
| private ClassMapping _target; |
| private int _subs; |
| private Joins _joins; |
| private boolean _inverse; |
| private boolean _correlated = false; |
| private boolean _isNotMyJoin = false; |
| |
| /** |
| * Constructor for inner and outer joins. |
| */ |
| Join(Table table1, int alias1, Table table2, int alias2, ForeignKey fk, |
| boolean inverse) { |
| _table1 = table1; |
| _alias1 = alias1; |
| _table2 = table2; |
| _alias2 = alias2; |
| _fk = fk; |
| _inverse = inverse; |
| } |
| |
| /** |
| * Private default constructor. |
| */ |
| private Join() { |
| } |
| |
| public int getType() { |
| return _type; |
| } |
| |
| public void setType(int type) { |
| _type = type; |
| } |
| |
| public String getAlias1() { |
| return SelectImpl.toAlias(_alias1); |
| } |
| |
| public String getAlias2() { |
| return SelectImpl.toAlias(_alias2); |
| } |
| |
| int getIndex1() { |
| return _alias1; |
| } |
| |
| int getIndex2() { |
| return _alias2; |
| } |
| |
| public Table getTable1() { |
| return _table1; |
| } |
| |
| public Table getTable2() { |
| return _table2; |
| } |
| |
| public ForeignKey getForeignKey() { |
| return _fk; |
| } |
| |
| public boolean isForeignKeyInversed() { |
| return _inverse; |
| } |
| |
| /** |
| * If joining a relation, the target type. |
| */ |
| public ClassMapping getRelationTarget() { |
| return _target; |
| } |
| |
| /** |
| * If joining a relation, how to deal with subclasses. See subclass |
| * constants in {@link Select}. |
| */ |
| public int getSubclasses() { |
| return _subs; |
| } |
| |
| /** |
| * If joining a relation, the joins leading to the relation. |
| */ |
| public Joins getRelationJoins() { |
| return _joins; |
| } |
| |
| /** |
| * When joining a relation, set target type and how to deal with |
| * subclasses. See subclass constants in {@link #Select}. |
| */ |
| public void setRelation(ClassMapping target, int subs, Joins joins) { |
| _target = target; |
| _subs = subs; |
| _joins = joins; |
| } |
| |
| /** |
| * Return a join that is this join in reverse. |
| */ |
| public Join reverse() { |
| Join join = new Join(); |
| join._type = _type; |
| join._table1 = _table2; |
| join._alias1 = _alias2; |
| join._table2 = _table1; |
| join._alias2 = _alias1; |
| join._inverse = !_inverse; |
| join._fk = _fk; |
| join._target = _target; |
| join._subs = _subs; |
| join._joins = _joins; |
| join._correlated = _correlated; |
| return join; |
| } |
| |
| @Override |
| public int hashCode() { |
| return _alias1 ^ _alias2; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (other == this) |
| return true; |
| if (!(other instanceof Join)) |
| return false; |
| |
| Join j = (Join) other; |
| return (_alias1 == j._alias1 && _alias2 == j._alias2) |
| || (_alias1 == j._alias2 && _alias2 == j._alias1); |
| } |
| |
| @Override |
| public String toString() { |
| String typeString; |
| if (_type == TYPE_CROSS) |
| typeString = "cross"; |
| else if (_type == TYPE_INNER) |
| typeString = "inner"; |
| else |
| typeString = "outer"; |
| if (_correlated) |
| typeString += " &"; |
| return "<" + System.identityHashCode(this) + "> t" |
| + _alias1 + "->t" + _alias2 + " (" + typeString + ")"; |
| } |
| |
| @Override |
| public Object clone() { |
| try { |
| return super.clone(); |
| } catch (Exception e) { |
| return null; |
| } |
| } |
| |
| public boolean isCorrelated() { |
| return _correlated; |
| } |
| |
| public void setCorrelated() { |
| _correlated = true; |
| } |
| |
| public boolean isNotMyJoin() { |
| return _isNotMyJoin; |
| } |
| |
| public void setIsNotMyJoin() { |
| _isNotMyJoin = true; |
| } |
| } |
| |