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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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/*
 * 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.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;

/**
 * Packs a {@link Method} or {@link Constructor} together with its parameter types. The actual
 * {@link Method} or {@link Constructor} is not exposed by the API, because in rare cases calling them require
 * type conversion that the Java reflection API can't do, hence the developer shouldn't be tempted to call them
 * directly. 
 */
abstract class CallableMemberDescriptor extends MaybeEmptyCallableMemberDescriptor {

    abstract TemplateModel invokeMethod(BeansWrapper bw, Object obj, Object[] args)
            throws TemplateModelException, InvocationTargetException, IllegalAccessException;

    abstract Object invokeConstructor(BeansWrapper bw, Object[] args)
            throws IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException,
            TemplateModelException;
    
    abstract String getDeclaration();
    
    abstract boolean isConstructor();
    
    abstract boolean isStatic();

    abstract boolean isVarargs();

    abstract Class[] getParamTypes();

    abstract String getName();
    
}