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/********************************************************************************
* Copyright (c) 2015-2018 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* SPDX-License-Identifier: EPL-2.0
*
********************************************************************************/
package org.eclipse.mdm.api.base.adapter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.mdm.api.base.model.Deletable;
/**
* Holds related entities of any kind and keeps track of modifications.
*/
public final class ChildrenStore {
private final Map<Class<? extends Deletable>, List<? extends Deletable>> current = new HashMap<>(0);
private final Map<Class<? extends Deletable>, List<? extends Deletable>> removed = new HashMap<>(0);
/**
* Returns current set of related children mapped by their type.
*
* @return Returned {@code Map} is unmodifiable.
*/
public Map<Class<? extends Deletable>, List<? extends Deletable>> getCurrent() {
return Collections.unmodifiableMap(current);
}
/**
* Returns current set of removed related children mapped by their type.
*
* @return Returned {@code Map} is unmodifiable.
*/
public Map<Class<? extends Deletable>, List<? extends Deletable>> getRemoved() {
return Collections.unmodifiableMap(removed);
}
/**
* Returns related child entities of given type.
*
* @param <T>
* Desired entity type.
* @param entityClass
* Used as identifier.
* @return Returned {@code List} is unmodifiable.
*/
@SuppressWarnings("unchecked")
public <T extends Deletable> List<T> get(Class<T> entityClass) {
return Collections.unmodifiableList((List<T>) current.computeIfAbsent(entityClass, k -> new ArrayList<>()));
}
/**
* Sorts the child entities with given {@code Comparator}.
*
* @param <T>
* Desired entity type.
* @param entityClass
* Used as identifier.
* @param comparator
* Used for sorting.
*/
@SuppressWarnings("unchecked")
public <T extends Deletable> void sort(Class<T> entityClass, Comparator<? super T> comparator) {
List<T> children = (List<T>) current.get(entityClass);
if (children != null) {
children.sort(comparator);
}
}
/**
* Adds given child entity.
*
* @param child
* The new child.
*/
@SuppressWarnings("unchecked")
public void add(Deletable child) {
removed.getOrDefault(child.getClass(), new ArrayList<>()).remove(child);
((List<Deletable>) current.computeIfAbsent(child.getClass(), k -> new ArrayList<>())).add(child);
}
/**
* Removes given child entity.
*
* @param child
* The child which will be removed.
*/
@SuppressWarnings("unchecked")
public void remove(Deletable child) {
List<Deletable> children = (List<Deletable>) current.getOrDefault(child.getClass(), new ArrayList<>());
if (children.remove(child) && child.getID() != null && child.getID().length() > 0) {
((List<Deletable>) removed.computeIfAbsent(child.getClass(), k -> new ArrayList<>())).add(child);
}
}
/**
* Clean up list of removed entities.
*/
void apply() {
removed.clear();
}
}
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