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.io.IOException;
056: import freemarker.template.*;
057:
058: /**
059: * An element that represents a conditionally executed block.
060: * @author <A HREF="mailto:jon@revusky.com">Jonathan Revusky</A>
061: */
062:
063: final class ConditionalBlock extends TemplateElement {
064:
065: final Expression condition;
066: private final boolean isFirst;
067: boolean isSimple;
068:
069: ConditionalBlock(Expression condition, TemplateElement nestedBlock,
070: boolean isFirst) {
071: this .condition = condition;
072: this .nestedBlock = nestedBlock;
073: this .isFirst = isFirst;
074: }
075:
076: void accept(Environment env) throws TemplateException, IOException {
077: if (condition == null || condition.isTrue(env)) {
078: if (nestedBlock != null) {
079: env.visit(nestedBlock);
080: }
081: }
082: }
083:
084: public String getCanonicalForm() {
085: StringBuffer buf = new StringBuffer();
086: if (condition == null) {
087: buf.append("<#else");
088: } else if (isFirst) {
089: buf.append("<#if ");
090: } else {
091: buf.append("<#elseif ");
092: }
093: if (condition != null) {
094: buf.append(condition.getCanonicalForm());
095: }
096: buf.append(">");
097: if (nestedBlock != null) {
098: buf.append(nestedBlock.getCanonicalForm());
099: }
100: if (isSimple) {
101: buf.append("</#if>");
102: }
103: return buf.toString();
104: }
105:
106: public String getDescription() {
107: String s = "if ";
108: if (condition == null) {
109: s = "else ";
110: } else if (!isFirst) {
111: s = "elseif ";
112: }
113: String cond = condition != null ? condition.toString() : "";
114: return s + cond;
115: }
116: }
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