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1
56
57 package org.objectstyle.cayenne.exp.parser;
58
59 import java.io.PrintWriter  ;
60 import java.math.BigDecimal ;
61
62 import org.objectstyle.cayenne.exp.Expression;
63 import org.objectstyle.cayenne.util.ConversionUtil;
64
65
71 public class ASTNegate extends SimpleNode {
72 ASTNegate(int id) {
73 super(id);
74 }
75
76 public ASTNegate() {
77 super(ExpressionParserTreeConstants.JJTNEGATE);
78 }
79
80 public ASTNegate(Object node) {
81 super(ExpressionParserTreeConstants.JJTNEGATE);
82 jjtAddChild(wrapChild(node), 0);
83 }
84
85
88 public Expression shallowCopy() {
89 return new ASTNegate(id);
90 }
91
92 protected Object evaluateNode(Object o) throws Exception {
93 int len = jjtGetNumChildren();
94 if (len == 0) {
95 return null;
96 }
97
98 BigDecimal result = ConversionUtil.toBigDecimal(evaluateChild(0, o));
99 return result != null ? result.negate() : null;
100 }
101
102 public void encodeAsString(PrintWriter pw) {
103 if ((children != null) && (children.length > 0)) {
104 pw.print("-");
105
106 SimpleNode child = (SimpleNode) children[0];
107
108 boolean useParen =
110 parent != null
111 && !((child instanceof ASTScalar) || (child instanceof ASTPath));
112 if (useParen) {
113 pw.print("(");
114 }
115
116 child.encodeAsString(pw);
117
118 if (useParen) {
119 pw.print(')');
120 }
121 }
122 }
123
124 protected String getExpressionOperator(int index) {
125 throw new UnsupportedOperationException (
126 "No operator for '" + ExpressionParserTreeConstants.jjtNodeName[id] + "'");
127 }
128
129 public int getType() {
130 return Expression.NEGATIVE;
131 }
132
133 public int getOperandCount() {
134 return 1;
135 }
136 }
137 |
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