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.*;
056: import java.util.*;
057: import freemarker.template.*;
058:
059: /**
060: * A template element that contains a nested block
061: * that is transformed according to an instance of T
062: * TemplateTransformModel
063: */
064: final class TransformBlock extends TemplateElement {
065:
066: private Expression transformExpression;
067: Map namedArgs;
068:
069: /**
070: * Creates new TransformBlock, with a given transformation
071: */
072: TransformBlock(Expression transformExpression, Map namedArgs,
073: TemplateElement nestedBlock) {
074: this .transformExpression = transformExpression;
075: this .namedArgs = namedArgs;
076: this .nestedBlock = nestedBlock;
077: }
078:
079: void accept(Environment env) throws TemplateException, IOException {
080: TemplateTransformModel ttm = env
081: .getTransform(transformExpression);
082: if (ttm != null) {
083: Map args;
084: if (namedArgs != null && !namedArgs.isEmpty()) {
085: args = new HashMap();
086: for (Iterator it = namedArgs.entrySet().iterator(); it
087: .hasNext();) {
088: Map.Entry entry = (Map.Entry) it.next();
089: String key = (String) entry.getKey();
090: Expression valueExp = (Expression) entry.getValue();
091: TemplateModel value = valueExp
092: .getAsTemplateModel(env);
093: args.put(key, value);
094: }
095: } else {
096: args = EmptyMap.instance;
097: }
098: env.visit(nestedBlock, ttm, args);
099: } else {
100: TemplateModel tm = transformExpression
101: .getAsTemplateModel(env);
102: throw invalidTypeException(tm, transformExpression, env,
103: "transform");
104: }
105: }
106:
107: public String getCanonicalForm() {
108: StringBuffer buf = new StringBuffer("<#transform ");
109: buf.append(transformExpression);
110: if (namedArgs != null) {
111: for (Iterator it = namedArgs.entrySet().iterator(); it
112: .hasNext();) {
113: Map.Entry entry = (Map.Entry) it.next();
114: buf.append(' ');
115: buf.append(entry.getKey());
116: buf.append('=');
117: Expression val = (Expression) entry.getValue();
118: buf.append(val.getCanonicalForm());
119: }
120: }
121: buf.append(">");
122: if (nestedBlock != null) {
123: buf.append(nestedBlock.getCanonicalForm());
124: }
125: buf.append("</#transform>");
126: return buf.toString();
127: }
128:
129: public String getDescription() {
130: return "transform " + transformExpression;
131: }
132: }
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