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1
19 package org.apache.cayenne.ejbql.parser;
20
21 import java.io.PrintWriter  ;
22 import java.io.Serializable ;
23 import java.io.StringWriter ;
24
25 import org.apache.cayenne.ejbql.EJBQLExpression;
26 import org.apache.cayenne.ejbql.EJBQLExpressionVisitor;
27
28
34 public abstract class SimpleNode implements Node, Serializable , EJBQLExpression {
35
36 final int id;
37 SimpleNode parent;
38 SimpleNode[] children;
39 boolean not;
40 String text;
41
42 public SimpleNode(int id) {
43 this.id = id;
44 }
45
46 public String getText() {
47 return text;
48 }
49
50 public boolean isNegated() {
51 return not;
52 }
53
54
58 public void visit(EJBQLExpressionVisitor visitor) {
59
60 if (visitNode(visitor)) {
61
62 int len = getChildrenCount();
63 for (int i = 0; i < len; i++) {
64 if (!visitChild(visitor, i)) {
65 break;
66 }
67 }
68 }
69 }
70
71
75 protected boolean visitNode(EJBQLExpressionVisitor visitor) {
76 return true;
77 }
78
79
83 protected boolean visitChild(EJBQLExpressionVisitor visitor, int childIndex) {
84 children[childIndex].visit(visitor);
85 return true;
86 }
87
88 public EJBQLExpression getChild(int index) {
89 return (EJBQLExpression) jjtGetChild(index);
90 }
91
92 public int getChildrenCount() {
93 return jjtGetNumChildren();
94 }
95
96 public String getName() {
97 String className = getClass().getName();
98 int i = className.lastIndexOf("EJBQL");
99 return i >= 0 ? className.substring(i + 5) : className;
100 }
101
102 public void jjtOpen() {
103 }
104
105 public void jjtClose() {
106 }
107
108 public void jjtSetParent(Node parent) {
109 this.parent = (SimpleNode) parent;
110 }
111
112 public Node jjtGetParent() {
113 return this.parent;
114 }
115
116 public void jjtAddChild(Node n, int i) {
117 if (children == null) {
118 children = new SimpleNode[i + 1];
119 }
120 else if (i >= children.length) {
121 SimpleNode c[] = new SimpleNode[i + 1];
122 System.arraycopy(children, 0, c, 0, children.length);
123 children = c;
124 }
125
126 children[i] = (SimpleNode) n;
127 }
128
129 public Node jjtGetChild(int i) {
130 return children[i];
131 }
132
133 public int jjtGetNumChildren() {
134 return (children == null) ? 0 : children.length;
135 }
136
137 public void setText(String text) {
138 this.text = text;
139 }
140
141 public String toString() {
142 StringWriter buffer = new StringWriter ();
143 PrintWriter pw = new PrintWriter (buffer);
144 dump(pw, "", true);
145 pw.close();
146 buffer.flush();
147 return buffer.toString();
148 }
149
150 void dump(PrintWriter out, String prefix, boolean text) {
151 out.println(prefix
152 + getName()
153 + (text && this.text != null ? " [" + this.text + "]" : ""));
154 if (children != null) {
155 for (int i = 0; i < children.length; ++i) {
156 SimpleNode n = (SimpleNode) children[i];
157 if (n != null) {
158 n.dump(out, prefix + " ", text);
159 }
160 }
161 }
162 }
163 }
164 |
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