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Java > Open Source Codes > org > apache > cayenne > exp > parser > ASTObjPath


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19
20
21 package org.apache.cayenne.exp.parser;
22
23 import java.io.PrintWriter JavaDoc;
24
25 import org.apache.cayenne.DataObject;
26 import org.apache.cayenne.exp.Expression;
27 import org.apache.cayenne.map.Entity;
28 import org.apache.cayenne.reflect.PropertyUtils;
29
30 public class ASTObjPath extends ASTPath {
31
32     /**
33      * Constructor used by expression parser. Do not invoke directly.
34      */
35     ASTObjPath(int id) {
36         super(id);
37     }
38
39     public ASTObjPath() {
40         super(ExpressionParserTreeConstants.JJTOBJPATH);
41     }
42
43     public ASTObjPath(Object JavaDoc value) {
44         super(ExpressionParserTreeConstants.JJTOBJPATH);
45         setPath(value);
46     }
47
48     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
49         return (o instanceof DataObject)
50             ? ((DataObject) o).readNestedProperty(path)
51             : (o instanceof Entity)
52             ? evaluateEntityNode((Entity) o)
53             : PropertyUtils.getProperty(o, path);
54     }
55
56     /**
57      * Creates a copy of this expression node, without copying children.
58      */
59     public Expression shallowCopy() {
60         ASTObjPath copy = new ASTObjPath(id);
61         copy.path = path;
62         return copy;
63     }
64
65     public void encodeAsString(PrintWriter JavaDoc pw) {
66         pw.print(path);
67     }
68
69     public int getType() {
70         return Expression.OBJ_PATH;
71     }
72 }
73
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