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1
21 package com.db4o.nativequery.expr;
22
23 import com.db4o.nativequery.expr.cmp.ComparisonOperand;
24 import com.db4o.nativequery.expr.cmp.ComparisonOperator;
25 import com.db4o.nativequery.expr.cmp.FieldValue;
26
27 public class ComparisonExpression implements Expression {
28 private FieldValue _left;
29 private ComparisonOperand _right;
30 private ComparisonOperator _op;
31
32 public ComparisonExpression(FieldValue left, ComparisonOperand right,ComparisonOperator op) {
33 if(left==null||right==null||op==null) {
34 throw new NullPointerException  ();
35 }
36 this._left = left;
37 this._right = right;
38 this._op = op;
39 }
40
41 public FieldValue left() {
42 return _left;
43 }
44
45 public ComparisonOperand right() {
46 return _right;
47 }
48
49 public ComparisonOperator op() {
50 return _op;
51 }
52
53 public String toString() {
54 return _left+" "+_op+" "+_right;
55 }
56
57 public boolean equals(Object other) {
58 if (this == other) {
59 return true;
60 }
61 if (other == null || getClass() != other.getClass()) {
62 return false;
63 }
64 ComparisonExpression casted = (ComparisonExpression) other;
65 return _left.equals(casted._left)&&_right.equals(casted._right)&&_op.equals(casted._op);
66 }
67
68 public int hashCode() {
69 return (_left.hashCode()*29+_right.hashCode())*29+_op.hashCode();
70 }
71
72 public void accept(ExpressionVisitor visitor) {
73 visitor.visit(this);
74 }
75 }
76 |
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