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56 package org.objectstyle.cayenne.exp.parser;
57
58 import java.math.BigDecimal  ;
59 import java.util.Collection ;
60 import java.util.Iterator ;
61
62 import org.objectstyle.cayenne.exp.Expression;
63 import org.objectstyle.cayenne.util.ConversionUtil;
64
65
71 public class ASTDivide extends SimpleNode {
72 ASTDivide(int id) {
73 super(id);
74 }
75
76 public ASTDivide() {
77 super(ExpressionParserTreeConstants.JJTDIVIDE);
78 }
79
80 public ASTDivide(Object [] nodes) {
81 super(ExpressionParserTreeConstants.JJTDIVIDE);
82 int len = nodes.length;
83 for (int i = 0; i < len; i++) {
84 jjtAddChild(wrapChild(nodes[i]), i);
85 }
86 }
87
88 public ASTDivide(Collection nodes) {
89 super(ExpressionParserTreeConstants.JJTDIVIDE);
90 int len = nodes.size();
91 Iterator it = nodes.iterator();
92 for (int i = 0; i < len; i++) {
93 jjtAddChild(wrapChild(it.next()), i);
94 }
95 }
96
97 protected Object evaluateNode(Object o) throws Exception {
98 int len = jjtGetNumChildren();
99 if (len == 0) {
100 return null;
101 }
102
103 BigDecimal result = null;
104 for (int i = 0; i < len; i++) {
105 BigDecimal value = ConversionUtil.toBigDecimal(evaluateChild(i, o));
106
107 if (value == null) {
108 return null;
109 }
110
111 result = (i == 0) ? value : result.divide(value, BigDecimal.ROUND_HALF_EVEN);
112 }
113
114 return result;
115 }
116
117
120 public Expression shallowCopy() {
121 return new ASTGreater(id);
122 }
123
124 protected String getExpressionOperator(int index) {
125 return "/";
126 }
127
128 public int getType() {
129 return Expression.DIVIDE;
130 }
131
132 public void jjtClose() {
133 super.jjtClose();
134 flattenTree();
135 }
136 }
137 |
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