| /* |
| * 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.TemplateModel; |
| |
| /** |
| * A reference to a top-level variable |
| */ |
| final class Identifier extends Expression { |
| |
| private final String name; |
| |
| Identifier(String name) { |
| this.name = name; |
| } |
| |
| @Override |
| TemplateModel _eval(Environment env) throws TemplateException { |
| try { |
| return env.getVariable(name); |
| } catch (NullPointerException e) { |
| if (env == null) { |
| throw new _MiscTemplateException( |
| "Variables are not available (certainly you are in a parse-time executed directive). " |
| + "The name of the variable you tried to read: ", name); |
| } else { |
| throw e; |
| } |
| } |
| } |
| |
| @Override |
| public String getCanonicalForm() { |
| return _CoreStringUtils.toFTLTopLevelIdentifierReference(name); |
| } |
| |
| /** |
| * The name of the identifier without any escaping or other syntactical distortions. |
| */ |
| String getName() { |
| return name; |
| } |
| |
| @Override |
| String getNodeTypeSymbol() { |
| return getCanonicalForm(); |
| } |
| |
| @Override |
| boolean isLiteral() { |
| return false; |
| } |
| |
| @Override |
| int getParameterCount() { |
| return 0; |
| } |
| |
| @Override |
| Object getParameterValue(int idx) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| @Override |
| ParameterRole getParameterRole(int idx) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| @Override |
| protected Expression deepCloneWithIdentifierReplaced_inner( |
| String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) { |
| if (this.name.equals(replacedIdentifier)) { |
| if (replacementState.replacementAlreadyInUse) { |
| Expression clone = replacement.deepCloneWithIdentifierReplaced(null, null, replacementState); |
| clone.copyLocationFrom(replacement); |
| return clone; |
| } else { |
| replacementState.replacementAlreadyInUse = true; |
| return replacement; |
| } |
| } else { |
| return new Identifier(this.name); |
| } |
| } |
| |
| } |