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.Date;
056: import freemarker.template.*;
057:
058: /**
059: * @version 1.0
060: * @author Attila Szegedi
061: */
062: class EvaluationUtil {
063: private EvaluationUtil() {
064: }
065:
066: static String getString(TemplateScalarModel model, Expression expr,
067: Environment env) throws TemplateException {
068: String value = model.getAsString();
069: if (value == null) {
070: if (env.isClassicCompatible()) {
071: return "";
072: } else {
073: throw new TemplateException(expr
074: + " evaluated to null string.", env);
075: }
076: }
077: return value;
078: }
079:
080: static Number getNumber(Expression expr, Environment env)
081: throws TemplateException {
082: TemplateModel model = expr.getAsTemplateModel(env);
083: return getNumber(model, expr, env);
084: }
085:
086: static Number getNumber(TemplateModel model, Expression expr,
087: Environment env) throws TemplateException {
088: if (model instanceof TemplateNumberModel) {
089: return getNumber((TemplateNumberModel) model, expr, env);
090: } else if (model == null) {
091: throw new InvalidReferenceException(
092: expr + " is undefined.", env);
093: } else {
094: throw new NonNumericalException(expr
095: + " is not a number, it is "
096: + model.getClass().getName(), env);
097: }
098: }
099:
100: static Number getNumber(TemplateNumberModel model, Expression expr,
101: Environment env) throws TemplateModelException,
102: TemplateException {
103: Number value = model.getAsNumber();
104: if (value == null) {
105: throw new TemplateException(expr
106: + " evaluated to null number.", env);
107: }
108: return value;
109: }
110:
111: static Date getDate(TemplateDateModel model, Expression expr,
112: Environment env) throws TemplateModelException,
113: TemplateException {
114: Date value = model.getAsDate();
115: if (value == null) {
116: throw new TemplateException(expr
117: + " evaluated to null date.", env);
118: }
119: return value;
120: }
121: }
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