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1
56
57 package org.objectstyle.cayenne.exp.parser;
58
59 import java.math.BigDecimal  ;
60 import java.util.Collection ;
61 import java.util.Iterator ;
62
63 import org.objectstyle.cayenne.exp.Expression;
64 import org.objectstyle.cayenne.util.ConversionUtil;
65
66
72 public class ASTSubtract extends SimpleNode {
73 ASTSubtract(int id) {
74 super(id);
75 }
76
77 public ASTSubtract() {
78 super(ExpressionParserTreeConstants.JJTSUBTRACT);
79 }
80
81 public ASTSubtract(Object [] nodes) {
82 super(ExpressionParserTreeConstants.JJTSUBTRACT);
83 int len = nodes.length;
84 for (int i = 0; i < len; i++) {
85 jjtAddChild(wrapChild(nodes[i]), i);
86 }
87 }
88
89 public ASTSubtract(Collection nodes) {
90 super(ExpressionParserTreeConstants.JJTSUBTRACT);
91 int len = nodes.size();
92 Iterator it = nodes.iterator();
93 for (int i = 0; i < len; i++) {
94 jjtAddChild(wrapChild(it.next()), i);
95 }
96 }
97
98 protected Object evaluateNode(Object o) throws Exception {
99 int len = jjtGetNumChildren();
100 if (len == 0) {
101 return null;
102 }
103
104 BigDecimal result = null;
105 for (int i = 0; i < len; i++) {
106 BigDecimal value = ConversionUtil.toBigDecimal(evaluateChild(i, o));
107
108 if (value == null) {
109 return null;
110 }
111
112 result = (i == 0) ? value : result.subtract(value);
113 }
114
115 return result;
116 }
117
118
121 public Expression shallowCopy() {
122 return new ASTSubtract(id);
123 }
124
125 protected String getExpressionOperator(int index) {
126 return "-";
127 }
128
129 public int getType() {
130 return Expression.SUBTRACT;
131 }
132
133 public void jjtClose() {
134 super.jjtClose();
135 flattenTree();
136 }
137 }
138 |
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