/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* Licensed 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());
}
}