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


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56
57 package org.objectstyle.cayenne.exp.parser;
58
59 import java.io.PrintWriter JavaDoc;
60
61 import org.apache.commons.beanutils.PropertyUtils;
62 import org.objectstyle.cayenne.DataObject;
63 import org.objectstyle.cayenne.exp.Expression;
64 import org.objectstyle.cayenne.map.Entity;
65
66 public class ASTObjPath extends ASTPath {
67
68     /**
69      * Constructor used by expression parser. Do not invoke directly.
70      */
71     ASTObjPath(int id) {
72         super(id);
73     }
74
75     public ASTObjPath() {
76         super(ExpressionParserTreeConstants.JJTOBJPATH);
77     }
78
79     public ASTObjPath(Object JavaDoc value) {
80         super(ExpressionParserTreeConstants.JJTOBJPATH);
81         setPath(value);
82     }
83
84     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
85         return (o instanceof DataObject)
86             ? ((DataObject) o).readNestedProperty(path)
87             : (o instanceof Entity)
88             ? evaluateEntityNode((Entity) o)
89             : PropertyUtils.getProperty(o, path);
90     }
91
92     /**
93      * Creates a copy of this expression node, without copying children.
94      */
95     public Expression shallowCopy() {
96         ASTObjPath copy = new ASTObjPath(id);
97         copy.path = path;
98         return copy;
99     }
100
101     public void encodeAsString(PrintWriter JavaDoc pw) {
102         pw.print(path);
103     }
104
105     public int getType() {
106         return Expression.OBJ_PATH;
107     }
108 }
109
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