|
1
56 package org.objectstyle.cayenne.exp.parser;
57
58 import java.io.PrintWriter  ;
59 import java.util.Map ;
60
61 import org.objectstyle.cayenne.DataObject;
62 import org.objectstyle.cayenne.ObjectId;
63 import org.objectstyle.cayenne.exp.Expression;
64 import org.objectstyle.cayenne.map.Entity;
65
66
72 public class ASTDbPath extends ASTPath {
73 ASTDbPath(int id) {
74 super(id);
75 }
76
77 public ASTDbPath() {
78 super(ExpressionParserTreeConstants.JJTDBPATH);
79 }
80
81 public ASTDbPath(Object value) {
82 super(ExpressionParserTreeConstants.JJTDBPATH);
83 setPath(value);
84 }
85
86 protected Object evaluateNode(Object o) throws Exception {
87
89 if (o instanceof Entity) {
90 return evaluateEntityNode((Entity) o);
91 }
92
93 Map map = toMap(o);
94 return (map != null) ? map.get(path) : null;
95 }
96
97 protected Map toMap(Object o) {
98 if (o instanceof Map ) {
99 return (Map ) o;
100 }
101 else if (o instanceof ObjectId) {
102 return ((ObjectId) o).getIdSnapshot();
103 }
104 else if (o instanceof DataObject) {
105 DataObject dataObject = (DataObject) o;
106
107 ObjectId oid = dataObject.getObjectId();
110 return (oid != null) ? oid.getIdSnapshot() : null;
111 }
112 else {
113 return null;
114 }
115 }
116
117
120 public Expression shallowCopy() {
121 ASTDbPath copy = new ASTDbPath(id);
122 copy.path = path;
123 return copy;
124 }
125
126 public void encodeAsString(PrintWriter pw) {
127 pw.print("db:");
128 pw.print(path);
129 }
130
131 public int getType() {
132 return Expression.DB_PATH;
133 }
134 }
135 |
Popular Tags |
Java API By Example, From Geeks To Geeks.