/*
* 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.viewer.wicket.ui.app.registry;
import java.util.Iterator;
import java.util.List;
import com.google.common.base.Predicate;
import com.google.common.collect.Lists;
import org.apache.isis.viewer.wicket.ui.ComponentFactory;
import org.apache.isis.viewer.wicket.ui.ComponentType;
/**
* Defines an API for registering {@link ComponentFactory}s.
*
* <p>
* As used by {@link ComponentFactoryListDefault}.
*/
public interface ComponentFactoryRegistrar {
public static class ComponentFactoryList implements Iterable<ComponentFactory> {
private final List<ComponentFactory> componentFactories = Lists.newArrayList();
public void add(ComponentFactory componentFactory) {
componentFactories.add(componentFactory);
}
public void replace(final ComponentFactory replacementComponentFactory) {
removeExisting(matching(replacementComponentFactory.getComponentType()));
add(replacementComponentFactory);
}
public void replace(final Class<? extends ComponentFactory> toReplace, final ComponentFactory replacementComponentFactory) {
int indexOfOldFactory = removeExisting(matching(toReplace));
insert(indexOfOldFactory, replacementComponentFactory);
}
private void insert(final int indexToInsertInto, final ComponentFactory replacementComponentFactory) {
if (indexToInsertInto > -1 && indexToInsertInto < componentFactories.size()) {
componentFactories.add(indexToInsertInto, replacementComponentFactory);
} else {
componentFactories.add(replacementComponentFactory);
}
}
private int removeExisting(final Predicate<ComponentFactory> predicate) {
int indexOfFirst = -1;
for (int i = 0; i < componentFactories.size(); i++) {
ComponentFactory factory = componentFactories.get(i);
if (predicate.apply(factory)) {
componentFactories.remove(i);
if (indexOfFirst == -1) {
indexOfFirst = i;
}
i--;
}
}
return indexOfFirst;
}
private static Predicate<ComponentFactory> matching(final ComponentType componentType) {
return new Predicate<ComponentFactory>() {
@Override
public boolean apply(ComponentFactory input) {
return input.getComponentType() == componentType;
}
};
}
private static Predicate<ComponentFactory> matching(final Class<? extends ComponentFactory> toReplace) {
return new Predicate<ComponentFactory>() {
@Override
public boolean apply(ComponentFactory input) {
return toReplace.isAssignableFrom(input.getClass());
}
};
}
@Override
public Iterator<ComponentFactory> iterator() {
return componentFactories.iterator();
}
}
void addComponentFactories(ComponentFactoryList componentFactoryList);
}