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1
56 package org.objectstyle.cayenne.exp.parser;
57
58 import java.util.Iterator  ;
59
60 import org.objectstyle.cayenne.map.Entity;
61
62
68 public abstract class ASTPath extends SimpleNode {
69 protected String path;
70
71 ASTPath(int i) {
72 super(i);
73 }
74
75 public int getOperandCount() {
76 return 1;
77 }
78
79 public Object getOperand(int index) {
80 if (index == 0) {
81 return path;
82 }
83
84 throw new ArrayIndexOutOfBoundsException (index);
85 }
86
87 public void setOperand(int index, Object value) {
88 if (index != 0) {
89 throw new ArrayIndexOutOfBoundsException (index);
90 }
91
92 setPath(value);
93 }
94
95 protected void setPath(Object path) {
96 this.path = (path != null) ? path.toString() : null;
97 }
98
99 protected String getPath() {
100 return path;
101 }
102
103
104
107 protected Object evaluateEntityNode(Entity entity) {
108 Iterator path = entity.resolvePathComponents(this);
109 Object next = null;
110 while (path.hasNext()) {
111 next = path.next();
112 }
113
114 return next;
115 }
116
117 protected String getExpressionOperator(int index) {
118 throw new UnsupportedOperationException (
119 "No operator for '" + ExpressionParserTreeConstants.jjtNodeName[id] + "'");
120 }
121 }
122 |
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