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1
56
57 package org.objectstyle.cayenne.exp;
58
59 import java.io.PrintWriter  ;
60
61
68 public class UnaryExpression extends Expression {
69 protected Object operand;
70
71 public UnaryExpression() {
72 }
73
74 public UnaryExpression(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
91 public Expression shallowCopy() {
92 return new UnaryExpression(type);
93 }
94
95 public final int getOperandCount() {
96 return 1;
97 }
98
99 public Object getOperand(int index) {
100 if (index == 0)
101 return operand;
102
103 throw new IllegalArgumentException (
104 "Invalid operand index for UnaryExpression: " + index);
105 }
106
107 public void setOperand(int index, Object value) {
108 if (index == 0) {
109 operand = value;
110 return;
111 }
112
113 throw new IllegalArgumentException (
114 "Invalid operand index for UnaryExpression: " + index);
115 }
116
117
120 public void encodeAsString(PrintWriter pw) {
121 StringBuffer buffer = new StringBuffer ();
124 toStringBuffer(buffer);
125 pw.print(buffer.toString());
126 }
127 }
128 |
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