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22
23 package org.xquark.extractor.algebra;
24
25 import java.util.*;
26
27 import org.xquark.extractor.common.Debug;
28 import org.xquark.extractor.common.SqlWrapperException;
29 import org.xquark.extractor.sql.SqlExpression;
30
31 public final class BinOpOuterJoin extends BinaryOperator implements Relation
32 {
33 private static final String  RCSRevision = "$Revision: 1.5 $";
34 private static final String RCSName = "$Name: $";
35
36 protected int _joinType;
37 protected List _predicateList;
38
39 List _keys;
40
41 public BinOpOuterJoin(Expression leftOperand, Expression rightOperand, int joinType, List predicateList)
42 {
43 super ( leftOperand, rightOperand );
44 setJoinType (joinType ) ;
45 setPredicateList ( predicateList );
46 }
47
48 synchronized Object clone(Map clonedExprs) throws CloneNotSupportedException
49 {
50 BinOpOuterJoin retVal = (BinOpOuterJoin)super.clone(clonedExprs);
51 retVal.setPredicateList(AlgebraTools.clone(getPredicateList(), clonedExprs));
52 clonedExprs.put(this, retVal);
53 return retVal;
54 }
55
56
61 public int getJoinType() { return _joinType;}
62
63
69 public void setJoinType(int aJoinType) { _joinType = aJoinType;}
70
71
76 public List getPredicateList() { return _predicateList;}
77
78 public void setPredicateList(List predicateList) {
79 _predicateList = predicateList;
80
81 if ( null != _predicateList )
82 {
83 Iterator itr ;
84 itr = _predicateList.iterator() ;
85 while ( itr.hasNext () ) {
86 ( (Expression)itr.next() ).setFather(this) ;
87 }
88 }
89 }
90
91
92 public void addPredicate(Expression predicate)
93 {
94 if (predicate == null)
95 return;
96
97 if (null == _predicateList)
98 _predicateList = new ArrayList ();
99
100 _predicateList.add(predicate);
101 predicate.setFather(this);
102 }
103
104
105 public Set providedTableInstances(){
106 return visibleTableInstances();
107 }
108
109 public AttributeExpression findNonNullAttribute() {
110 AttributeExpression ret = ((Relation)_leftOperand).findNonNullAttribute();
111 if (ret == null)
112 ret = ((Relation)_rightOperand).findNonNullAttribute();
113 return ret;
114 }
115
116 public boolean replaceChild(Expression oldChild, Expression newChild)
117 {
118 boolean retVal = false;
119 List list = getPredicateList();
120
121 Expression expr = null ;
122 for (int i = 0; i < list.size(); i++) {
123 expr = (Expression)list.get(i);
124 if (expr.equals(oldChild)) {
125 list.set(i, newChild);
126 newChild.setFather(this);
127 retVal = true;
128 break;
129 }
130 }
131
132 if (getLeftOperand().equals(oldChild)) {
133 setLeftOperand(newChild);
134 retVal = true;
135 }
136 else if (getRightOperand().equals(oldChild)) {
137 setRightOperand(newChild);
138 retVal = true;
139 }
140 return retVal;
141 }
142
143
144 public void setKeys(List keys) {
145 _keys = keys;
146 }
147
148 public List getKeys() {
149 return _keys;
150 }
151
152 public List nameTest(String name)
153 {
154 Debug.nyi("BinOpOuterJoin::nameTest(String name)");
155 return ((Relation)getLeftOperand()).nameTest(name);
156 }
157
158 public Set participants() {
159 Set retVal = new HashSet();
160 BuildReferredAttributes visitor = new BuildReferredAttributes();
161 Expression predicate = null;
162 for (int i = 0; i < _predicateList.size(); i++) {
163 predicate = (Expression)_predicateList.get(i);
164 predicate.accept(visitor);
165 retVal.addAll(predicate.getReferredTableInstances());
166 }
167
168 return retVal;
169 }
170
171 public SqlExpression accept (GenSqlVisitor visitor) throws SqlWrapperException
172 {
173 return visitor.visit(this);
174 }
175
176 public void accept (AlgebraVisitor visitor) throws SqlWrapperException
177 {
178 visitor.visit(this);
179 }
180 }
181
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188 |
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