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Liferay Portal Template FreeMarker
/*
* 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.
*/
@Override
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);
}
}
@Override
public TemplateModel get(int index) throws TemplateModelException {
return (TemplateModel) exec(Collections.singletonList(
new SimpleNumber(Integer.valueOf(index))));
}
@Override
public int size() throws TemplateModelException {
throw new TemplateModelException("?size is unsupported for " + getClass().getName());
}
}
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