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Java > Open Source Codes > org > objectstyle > cayenne > exp > TernaryExpression


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56 package org.objectstyle.cayenne.exp;
57
58 import java.io.PrintWriter JavaDoc;
59
60 /**
61  * Generic ternary expression.
62  * Describes expression in a form: "<tt>doSomething(operand1, operand2, operand3)</tt>".
63  * SQL example of ternary expression is BETWEEN expression.
64  */

65 public class TernaryExpression extends Expression {
66     protected Object JavaDoc operand0;
67     protected Object JavaDoc operand1;
68     protected Object JavaDoc operand2;
69
70     public TernaryExpression() {
71     }
72
73     public TernaryExpression(int type) {
74         this.type = type;
75     }
76
77     protected void flattenTree() {
78
79     }
80
81     protected boolean pruneNodeForPrunedChild(Object JavaDoc prunedChild) {
82         return true;
83     }
84
85     public final int getOperandCount() {
86         return 3;
87     }
88
89     /**
90      * Creates a copy of this expression node, without copying children.
91      *
92      * @since 1.1
93      */

94     public Expression shallowCopy() {
95         return new TernaryExpression(type);
96     }
97
98     public Object JavaDoc getOperand(int index) {
99         if (index == 0)
100             return operand0;
101         else if (index == 1)
102             return operand1;
103         else if (index == 2)
104             return operand2;
105
106         throw new IllegalArgumentException JavaDoc(
107             "Invalid operand index for TernaryExpression: " + index);
108     }
109
110     public void setOperand(int index, Object JavaDoc value) {
111         if (index == 0) {
112             operand0 = value;
113             return;
114         }
115         else if (index == 1) {
116             operand1 = value;
117             return;
118         }
119         else if (index == 2) {
120             operand2 = value;
121             return;
122         }
123
124         throw new IllegalArgumentException JavaDoc(
125             "Invalid operand index for TernaryExpression: " + index);
126     }
127
128     /**
129      * @since 1.1
130      */

131     public void encodeAsString(PrintWriter JavaDoc pw) {
132         // this class will be deprecated soon, so using
133
// a deprecated "toStringBuffer" is OK
134
StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
135         toStringBuffer(buffer);
136         pw.print(buffer.toString());
137     }
138 }
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