01: /*
02: * Copyright 2006, 2007 Odysseus Software GmbH
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: package de.odysseus.el.tree.impl.ast;
17:
18: import javax.el.ELContext;
19: import javax.el.ELException;
20:
21: import de.odysseus.el.misc.TypeConversions;
22: import de.odysseus.el.tree.Bindings;
23:
24: public final class AstChoice extends AstRightValue {
25: private final AstNode question, yes, no;
26:
27: public AstChoice(AstNode question, AstNode yes, AstNode no) {
28: this .question = question;
29: this .yes = yes;
30: this .no = no;
31: }
32:
33: @Override
34: public Object eval(Bindings bindings, ELContext context)
35: throws ELException {
36: Boolean value = TypeConversions.coerceToBoolean(question.eval(
37: bindings, context));
38: return value.booleanValue() ? yes.eval(bindings, context) : no
39: .eval(bindings, context);
40: }
41:
42: @Override
43: public String toString() {
44: return "?";
45: }
46:
47: @Override
48: public void appendStructure(StringBuilder b, Bindings bindings) {
49: question.appendStructure(b, bindings);
50: b.append(" ? ");
51: yes.appendStructure(b, bindings);
52: b.append(" : ");
53: no.appendStructure(b, bindings);
54: }
55:
56: public int getCardinality() {
57: return 3;
58: }
59:
60: public AstNode getChild(int i) {
61: return i == 0 ? question : i == 1 ? yes : i == 2 ? no : null;
62: }
63: }
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