| /* |
| * 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.TemplateException; |
| import freemarker.template.TemplateHashModel; |
| import freemarker.template.TemplateModel; |
| |
| /** |
| * The dot operator. Used to reference items inside a |
| * <code>TemplateHashModel</code>. |
| */ |
| final class Dot extends Expression { |
| private final Expression target; |
| private final String key; |
| |
| Dot(Expression target, String key) { |
| this.target = target; |
| this.key = key; |
| } |
| |
| @Override |
| TemplateModel _eval(Environment env) throws TemplateException { |
| TemplateModel leftModel = target.eval(env); |
| if (leftModel instanceof TemplateHashModel) { |
| return ((TemplateHashModel) leftModel).get(key); |
| } |
| if (leftModel == null && env.isClassicCompatible()) { |
| return null; // ${noSuchVar.foo} has just printed nothing in FM 1. |
| } |
| throw new NonHashException(target, leftModel, env); |
| } |
| |
| @Override |
| public String getCanonicalForm() { |
| return target.getCanonicalForm() + getNodeTypeSymbol() + _CoreStringUtils.toFTLIdentifierReferenceAfterDot(key); |
| } |
| |
| @Override |
| String getNodeTypeSymbol() { |
| return "."; |
| } |
| |
| @Override |
| boolean isLiteral() { |
| return target.isLiteral(); |
| } |
| |
| @Override |
| protected Expression deepCloneWithIdentifierReplaced_inner( |
| String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) { |
| return new Dot( |
| target.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState), |
| key); |
| } |
| |
| @Override |
| int getParameterCount() { |
| return 2; |
| } |
| |
| @Override |
| Object getParameterValue(int idx) { |
| return idx == 0 ? (Object) target : (Object) key; |
| } |
| |
| @Override |
| ParameterRole getParameterRole(int idx) { |
| return ParameterRole.forBinaryOperatorOperand(idx); |
| } |
| |
| String getRHO() { |
| return key; |
| } |
| |
| boolean onlyHasIdentifiers() { |
| return (target instanceof Identifier) || ((target instanceof Dot) && ((Dot) target).onlyHasIdentifiers()); |
| } |
| } |