/*
* 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 org.apache.isis.core.metamodel.specloader.traverser;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* Abstract base class factoring out common functionality for helper methods
* that extract parameterized types.
*
*/
abstract class TypeExtractorAbstract implements Iterable<Class<?>> {
private final Method method;
private final List<Class<?>> classes = new ArrayList<Class<?>>();
public TypeExtractorAbstract(final Method method) {
this.method = method;
}
protected void addParameterizedTypes(final Type... genericTypes) {
for (final Type genericType : genericTypes) {
if (genericType instanceof ParameterizedType) {
final ParameterizedType parameterizedType = (ParameterizedType) genericType;
final Type[] typeArguments = parameterizedType.getActualTypeArguments();
for (final Type type : typeArguments) {
if (type instanceof Class) {
final Class<?> cls = (Class<?>) type;
add(cls);
}
}
}
}
}
/**
* Adds to {@link #getClasses() list of classes}, provided not {@link Void}.
*/
protected void add(final Class<?> cls) {
if (cls == void.class) {
return;
}
classes.add(cls);
}
/**
* The {@link Method} provided in the {@link #TypeExtractorAbstract(Method)
* constructor.}
*/
protected Method getMethod() {
return method;
}
public List<Class<?>> getClasses() {
return Collections.unmodifiableList(classes);
}
@Override
public Iterator<Class<?>> iterator() {
return getClasses().iterator();
}
}