/*
* 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.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(new Integer(index))));
}
public int size() throws TemplateModelException
{
throw new TemplateModelException("?size is unsupported for " + getClass().getName());
}
}