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1
22
23
28
29 package org.xquark.xquery.parser.hinttree;
30
31 import java.util.ArrayList  ;
32
33 import org.xquark.xquery.parser.Variable;
34
35 public class HintTree extends Object {
36 private static final String RCSRevision = "$Revision: 1.2 $";
37 private static final String RCSName = "$Name: $";
38
39 public static final byte NO_SIDE = 0;
40 public static final byte LEFT_SIDE = 1;
41 public static final byte RIGHT_SIDE = 2;
42 public static final byte NO_TYPE = 0;
43 public static final byte NESTED_TYPE = 1;
44 public static final byte JOIN_TYPE = 2;
45 public static final byte MERGE_TYPE = 3;
46 public static final byte CARTESIAN_PRODUCT_TYPE = 4;
47 public static final byte NESTED_LOOP_TYPE = 5;
48
49 protected Object left = null;
51 protected Object right = null;
52 protected byte type = NO_TYPE;
53 protected byte side = NO_SIDE;
54 protected byte outertype = NO_TYPE;
55 protected ArrayList varList = null;
56
57
61
65 public HintTree(byte type, byte side, Object left, Object right) {
66 setType(type);
67 setSide(side);
68 setLeft(left);
69 setRight(right);
70 }
71
72
76 public byte getType() {
77 return type;
78 }
79
80 public byte getOuterType() {
81 return outertype;
82 }
83
84 public byte getSide() {
85 return side;
86 }
87
88 public Object getLeftHint() {
89 return left;
90 }
91
92 public Object getRightHint() {
93 return right;
94 }
95
96 public void setType(byte type) {
97 this.type = type;
98 }
99
100 public void setOuterType(byte outertype) {
101 this.outertype = outertype;
102 }
103
104 public void setSide(byte side) {
105 this.side = side;
106 }
107
108 public void setLeft(Object left) {
109 this.left = left;
110 if (left == null) return;
111 if (left instanceof Variable)
112 this.addVarList((Variable)left);
113 else
114 this.addVarsList(((HintTree)left).getVarList());
115 }
116
117 public void setRight(Object right) {
118 this.right = right;
119 if (right == null) return;
120 if (right instanceof Variable)
121 this.addVarList((Variable)right);
122 else
123 this.addVarsList(((HintTree)right).getVarList());
124 }
125
126 public void setVarList(ArrayList varList) {
127 this.varList = varList;
128 }
129
130 public ArrayList getVarList() {
131 return this.varList;
132 }
133
134 public boolean hasMerge() {
135 if (type == MERGE_TYPE)
136 return true;
137 boolean has = false;
138 if (left instanceof HintTree)
139 has = ((HintTree)left).hasMerge();
140 if (has)
141 return true;
142 if (right instanceof HintTree)
143 has = ((HintTree)right).hasMerge();
144 return has;
145 }
146
147 private void addVarList(Variable var) {
148 if (this.varList == null) this.varList = new ArrayList (1);
149 this.varList.add(var);
150 }
151
152 private void addVarsList(ArrayList vars) {
153 if (this.varList == null) this.varList = (ArrayList )vars.clone();
154 else this.varList.addAll(vars);
155 }
156
157
161 public String toString() {
162 StringBuffer buf = new StringBuffer ();
163 switch (type) {
164 case NESTED_TYPE : buf.append("nested"); break;
165 case JOIN_TYPE : buf.append("join"); break;
166 case MERGE_TYPE : buf.append("merge"); break;
167 case CARTESIAN_PRODUCT_TYPE : buf.append("cartesian-product"); break;
168 case NESTED_LOOP_TYPE : buf.append("nested-loop"); break;
169 default : buf.append("ERROR");
170 }
171 buf.append("(");
172 buf.append(left);
173 buf.append(" , ");
174 buf.append(right);
175 buf.append(")");
176 return buf.toString();
177 }
178
179
183
184 }
185 |
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