| /* |
| * Copyright (c) 2006 The Visigoth Software Society. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowledgement: |
| * "This product includes software developed by the |
| * Visigoth Software Society (http://www.visigoths.org/)." |
| * Alternately, this acknowledgement may appear in the software itself, |
| * if and wherever such third-party acknowledgements normally appear. |
| * |
| * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the |
| * project contributors may be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact visigoths@visigoths.org. |
| * |
| * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth" |
| * nor may "FreeMarker" or "Visigoth" appear in their names |
| * without prior written permission of the Visigoth Software Society. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Visigoth Software Society. For more |
| * information on the Visigoth Software Society, please see |
| * http://www.visigoths.org/ |
| */ |
| |
| |
| package freemarker.core; |
| |
| import freemarker.template.TemplateBooleanModel; |
| import freemarker.template.TemplateException; |
| import freemarker.template.TemplateModel; |
| |
| /** {@code exp??} and {@code (exp)??} */ |
| class ExistsExpression extends Expression { |
| |
| protected final Expression exp; |
| |
| ExistsExpression(Expression exp) { |
| this.exp = exp; |
| } |
| |
| TemplateModel _eval(Environment env) throws TemplateException { |
| TemplateModel tm; |
| if (exp instanceof ParentheticalExpression) { |
| boolean lastFIRE = env.setFastInvalidReferenceExceptions(true); |
| try { |
| tm = exp.eval(env); |
| } catch (InvalidReferenceException ire) { |
| tm = null; |
| } finally { |
| env.setFastInvalidReferenceExceptions(lastFIRE); |
| } |
| } else { |
| tm = exp.eval(env); |
| } |
| return tm == null ? TemplateBooleanModel.FALSE : TemplateBooleanModel.TRUE; |
| } |
| |
| boolean isLiteral() { |
| return false; |
| } |
| |
| protected Expression deepCloneWithIdentifierReplaced_inner(String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) { |
| return new ExistsExpression( |
| exp.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState)); |
| } |
| |
| public String getCanonicalForm() { |
| return exp.getCanonicalForm() + getNodeTypeSymbol(); |
| } |
| |
| String getNodeTypeSymbol() { |
| return "??"; |
| } |
| |
| int getParameterCount() { |
| return 1; |
| } |
| |
| Object getParameterValue(int idx) { |
| return exp; |
| } |
| |
| ParameterRole getParameterRole(int idx) { |
| return ParameterRole.LEFT_HAND_OPERAND; |
| } |
| |
| } |