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package com.codingame.gameengine.module.entities;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
*
*
* @param
* a subclass inheriting Entity, used in order to return this as a T instead of a ContainerBasedEntity.
*/
public abstract class ContainerBasedEntity> extends Entity {
private Set> entities;
ContainerBasedEntity() {
super();
entities = new HashSet<>();
}
/**
* Separates the given entity from this ContainerBasedEntity.
*
* @param entity
* the Entity to be removed from this ContainerBasedEntity, if it is part of it.
*/
public void remove(Entity entity) {
if (entity.parent == this) {
entity.parent = null;
entities.remove(entity);
set("children", asString(entities), null);
}
}
/**
* Adds the given Entity instances to this ContainerBasedEntity.
*
* The entities will be displayed within a container controlled by this ContainerBasedEntity.
*
* @param entities
* the Entity instances to be added to this ContainerBasedEntity.
* @exception IllegalArgumentException
* if at least one given Entity is already in a ContainerBasedEntity.
*/
public void add(Entity... entities) {
Stream.of(entities).forEach(entity -> {
if (entity.getParent().isPresent()) {
throw new IllegalArgumentException(
String.format(
"Cannot add entity %d to container %d: it is already in container %d",
entity.getId(),
getId(),
entity.getParent().get().getId()
)
);
}
this.entities.add(entity);
entity.parent = this;
});
set("children", asString(this.entities), null);
}
private String asString(Set> entities) {
return entities.stream()
.map(e -> String.valueOf(e.getId()))
.collect(Collectors.joining(","));
}
}