/*
* 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.ext.beans;
import java.util.
Collections;
import java.util.
List;
import freemarker.template.
SimpleNumber;
import freemarker.template.
TemplateMethodModelEx;
import freemarker.template.
TemplateModel;
import freemarker.template.
TemplateModelException;
import freemarker.template.
TemplateSequenceModel;
/**
* Wraps a set of same-name overloaded methods behind {@link freemarker.template.TemplateMethodModel} interface,
* like if it was a single method, chooses among them behind the scenes on call-time based on the argument values.
*/
public class
OverloadedMethodsModel
implements
TemplateMethodModelEx,
TemplateSequenceModel {
private final
Object object;
private final
OverloadedMethods overloadedMethods;
private final
BeansWrapper wrapper;
OverloadedMethodsModel(
Object object,
OverloadedMethods overloadedMethods,
BeansWrapper wrapper) {
this.
object =
object;
this.
overloadedMethods =
overloadedMethods;
this.
wrapper =
wrapper;
}
/**
* Invokes the method, passing it the arguments from the list. The actual
* method to call from several overloaded methods will be chosen based
* on the classes of the arguments.
* @throws TemplateModelException if the method cannot be chosen
* unambiguously.
*/
public
Object exec(
List arguments)
throws
TemplateModelException {
MemberAndArguments maa =
overloadedMethods.
getMemberAndArguments(
arguments,
wrapper);
try {
return
maa.
invokeMethod(
wrapper,
object);
} catch (
Exception e) {
if (
e instanceof
TemplateModelException) throw (
TemplateModelException)
e;
throw
_MethodUtil.
newInvocationTemplateModelException(
object,
maa.
getCallableMemberDescriptor(),
e);
}
}
public
TemplateModel get(int
index) throws
TemplateModelException {
return (
TemplateModel)
exec(
Collections.
singletonList(
new
SimpleNumber(
Integer.
valueOf(
index))));
}
public int
size() throws
TemplateModelException {
throw new
TemplateModelException("?size is unsupported for " +
getClass().
getName());
}
}