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1
56 package org.objectstyle.cayenne.exp;
57
58 import java.io.PrintWriter  ;
59
60
67 public class BinaryExpression extends Expression {
68 protected Object leftOperand;
69 protected Object rightOperand;
70
71 public BinaryExpression() {
72 }
73
74 public BinaryExpression(int type) {
75 this.type = type;
76 }
77
78 protected void flattenTree() {
79
80 }
81
82 protected boolean pruneNodeForPrunedChild(Object prunedChild) {
83 return true;
84 }
85
86 public final int getOperandCount() {
87 return 2;
88 }
89
90
95 public Expression shallowCopy() {
96 return new BinaryExpression(type);
97 }
98
99 public Object getOperand(int index) {
100 if (index == 0)
101 return leftOperand;
102 else if (index == 1)
103 return rightOperand;
104
105 throw new IllegalArgumentException (
106 "Invalid operand index for BinaryExpression: " + index);
107 }
108
109 public void setOperand(int index, Object value) {
110 if (index == 0) {
111 leftOperand = value;
112 return;
113 }
114 else if (index == 1) {
115 rightOperand = value;
116 return;
117 }
118
119 throw new IllegalArgumentException (
120 "Invalid operand index for BinaryExpression: " + index);
121 }
122
123
126 public void encodeAsString(PrintWriter pw) {
127 StringBuffer buffer = new StringBuffer ();
130 toStringBuffer(buffer);
131 pw.print(buffer.toString());
132 }
133 }
134 |
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