sdm03/src/main/java/com/github/dtschust/zork/types/ZorkContainer.java

package com.github.dtschust.zork.types;

import com.github.dtschust.zork.Zork;
import com.github.dtschust.zork.ZorkTrigger;

import java.util.*;

import static com.github.dtschust.zork.Zork.Type.ITEM;

/* Container*/
public class ZorkContainer extends ZorkObject implements HasSetOfCollectable {
    private final Set<String> items;
    private final List<String> accepts;
    private boolean open;

    public ZorkContainer(final String name,
                         final String description,
                         final String status,
                         final Collection<String> items,
                         final Collection<String> accepts,
                         final Collection<ZorkTrigger> triggers) {
        super(name, description, status, triggers);
        // If a container has an accepts attribute, then it is always open
        this.open = !accepts.isEmpty();
        this.items = new HashSet<>(items);
        this.accepts = new ArrayList<>(accepts);
    }

    public String getContents() {
        if (this.items.isEmpty()) {
            return getName() + " is empty";
        } else {
            return getName() + " contains " + String.join(", ", items) + ".";
        }
    }

    public void addItem(final String item) {
        this.items.add(item);
    }

    public void removeItem(final String item) {
        this.items.remove(item);
    }

    public boolean containsItem(final String item) {
        return this.items.contains(item);
    }

    public Iterable<String> items() {
        return Collections.unmodifiableSet(items);
    }

    public boolean isOpen() {
        return open;
    }

    public void open() {
        open = true;
    }

    @Override
    public Set<String> getSetFromType(Zork.Type type) {
        if (type.equals(ITEM))
            return items;
        throw new IllegalStateException("Unexpected value: " + type);
    }

    public List<String> getAccepts() {
        return Collections.unmodifiableList(accepts);
    }
}