001: /*
002: * Copyright (c) 2003 The Visigoth Software Society. All rights
003: * reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions
007: * are met:
008: *
009: * 1. Redistributions of source code must retain the above copyright
010: * notice, this list of conditions and the following disclaimer.
011: *
012: * 2. Redistributions in binary form must reproduce the above copyright
013: * notice, this list of conditions and the following disclaimer in
014: * the documentation and/or other materials provided with the
015: * distribution.
016: *
017: * 3. The end-user documentation included with the redistribution, if
018: * any, must include the following acknowledgement:
019: * "This product includes software developed by the
020: * Visigoth Software Society (http://www.visigoths.org/)."
021: * Alternately, this acknowledgement may appear in the software itself,
022: * if and wherever such third-party acknowledgements normally appear.
023: *
024: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025: * project contributors may be used to endorse or promote products derived
026: * from this software without prior written permission. For written
027: * permission, please contact visigoths@visigoths.org.
028: *
029: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030: * nor may "FreeMarker" or "Visigoth" appear in their names
031: * without prior written permission of the Visigoth Software Society.
032: *
033: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044: * SUCH DAMAGE.
045: * ====================================================================
046: *
047: * This software consists of voluntary contributions made by many
048: * individuals on behalf of the Visigoth Software Society. For more
049: * information on the Visigoth Software Society, please see
050: * http://www.visigoths.org/
051: */
052:
053: package freemarker.core;
054:
055: import java.util.ArrayList;
056: import java.io.IOException;
057: import freemarker.template.TemplateException;
058:
059: /**
060: * A instruction that handles if-elseif-else blocks.
061: * @author <A HREF="mailto:jon@revusky.com">Jonathan Revusky</A>
062: */
063:
064: final class IfBlock extends TemplateElement {
065:
066: IfBlock(ConditionalBlock block) {
067: nestedElements = new ArrayList();
068: addBlock(block);
069: }
070:
071: void addBlock(ConditionalBlock block) {
072: nestedElements.add(block);
073: }
074:
075: void accept(Environment env) throws TemplateException, IOException {
076: for (int i = 0; i < nestedElements.size(); i++) {
077: ConditionalBlock cblock = (ConditionalBlock) nestedElements
078: .get(i);
079: Expression condition = cblock.condition;
080: if (condition == null || condition.isTrue(env)) {
081: if (cblock.nestedBlock != null) {
082: env.visit(cblock.nestedBlock);
083: }
084: return;
085: }
086: }
087: }
088:
089: public String getCanonicalForm() {
090: StringBuffer buf = new StringBuffer();
091: for (int i = 0; i < nestedElements.size(); i++) {
092: ConditionalBlock cblock = (ConditionalBlock) nestedElements
093: .get(i);
094: buf.append(cblock.getCanonicalForm());
095: }
096: buf.append("</#if>");
097: return buf.toString();
098: }
099:
100: TemplateElement postParseCleanup(boolean stripWhitespace)
101: throws ParseException {
102: if (nestedElements.size() == 1) {
103: ConditionalBlock cblock = (ConditionalBlock) nestedElements
104: .get(0);
105: cblock.isSimple = true;
106: cblock.setLocation(getTemplate(), cblock, this );
107: return cblock.postParseCleanup(stripWhitespace);
108: } else {
109: return super .postParseCleanup(stripWhitespace);
110: }
111: }
112:
113: public String getDescription() {
114: return "if-else ";
115: }
116: }
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