01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.template.instruction;
18:
19: import java.util.Stack;
20:
21: import org.apache.cocoon.components.expression.ExpressionContext;
22: import org.apache.cocoon.template.environment.ExecutionContext;
23: import org.apache.cocoon.template.environment.ParsingContext;
24: import org.apache.cocoon.template.script.Invoker;
25: import org.apache.cocoon.template.script.event.Event;
26: import org.apache.cocoon.template.script.event.StartElement;
27: import org.apache.cocoon.xml.XMLConsumer;
28: import org.xml.sax.Attributes;
29: import org.xml.sax.SAXException;
30: import org.xml.sax.SAXParseException;
31:
32: /**
33: * @version SVN $Id: Choose.java 449189 2006-09-23 06:52:29Z crossley $
34: */
35: public class Choose extends Instruction {
36:
37: private When firstChoice;
38: private Otherwise otherwise;
39:
40: public Choose(ParsingContext parsingContext, StartElement raw,
41: Attributes attrs, Stack stack) {
42: super (raw);
43: }
44:
45: public Event execute(final XMLConsumer consumer,
46: ExpressionContext expressionContext,
47: ExecutionContext executionContext,
48: MacroContext macroContext, Event startEvent, Event endEvent)
49: throws SAXException {
50: When startWhen = this .firstChoice;
51: while (startWhen != null) {
52: Object val;
53: try {
54: val = startWhen.getTest().getValue(expressionContext);
55: } catch (Exception e) {
56: throw new SAXParseException(e.getMessage(),
57: getLocation(), e);
58: }
59: boolean result;
60: if (val instanceof Boolean) {
61: result = ((Boolean) val).booleanValue();
62: } else {
63: result = (val != null);
64: }
65: if (result) {
66: Invoker.execute(consumer, expressionContext,
67: executionContext, macroContext, startWhen
68: .getNext(), startWhen
69: .getEndInstruction());
70: break;
71: }
72: startWhen = startWhen.getNextChoice();
73: }
74: if (startWhen == null && this .otherwise != null) {
75: Invoker.execute(consumer, expressionContext,
76: executionContext, macroContext, this .otherwise
77: .getNext(), this .otherwise
78: .getEndInstruction());
79: }
80: return getEndInstruction().getNext();
81: }
82:
83: public void setFirstChoice(When firstChoice) {
84: this .firstChoice = firstChoice;
85: }
86:
87: public When getFirstChoice() {
88: return firstChoice;
89: }
90:
91: public void setOtherwise(Otherwise otherwise) {
92: this .otherwise = otherwise;
93: }
94:
95: public Otherwise getOtherwise() {
96: return otherwise;
97: }
98: }
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