| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| |
| 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; |
| } |
| |
| @Override |
| 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; |
| } |
| |
| @Override |
| boolean isLiteral() { |
| return false; |
| } |
| |
| @Override |
| protected Expression deepCloneWithIdentifierReplaced_inner(String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) { |
| return new ExistsExpression( |
| exp.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState)); |
| } |
| |
| @Override |
| public String getCanonicalForm() { |
| return exp.getCanonicalForm() + getNodeTypeSymbol(); |
| } |
| |
| @Override |
| String getNodeTypeSymbol() { |
| return "??"; |
| } |
| |
| @Override |
| int getParameterCount() { |
| return 1; |
| } |
| |
| @Override |
| Object getParameterValue(int idx) { |
| return exp; |
| } |
| |
| @Override |
| ParameterRole getParameterRole(int idx) { |
| return ParameterRole.LEFT_HAND_OPERAND; |
| } |
| |
| } |