BulkSetterCommand.java

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package com.todomvc.shared.command;

import static com.google.common.base.Preconditions.checkNotNull;

import javax.annotation.Nullable;

import com.todomvc.shared.model.IdentifiableCollection;
import com.todomvc.shared.model.ToDoList;

Command that sets a value of type V on every identifiable object of type E contained in an identifiable collection.

Data carried:

id of target collection
value to be set

public abstract class BulkSetterCommand<V, E, T extends IdentifiableCollection<? extends E>>
        extends BaseCommand<T> {

    private V value;

    protected BulkSetterCommand() {
    }

    public BulkSetterCommand(String collectionId, @Nullable V value, String commandType) {
        super(checkNotNull(collectionId), checkNotNull(commandType));
        this.value = value;
    }

    @Override
    public void execute(T collection) {
        for (E object : collection) {
            setValue(object, value);
        }
    }

Can execute on any collection, regardless of the current state of the items.

    @Override
    public boolean canExecuteOn(T collection) {
        return collection != null;
    }

    protected abstract void setValue(E target,  @Nullable V value);

    protected V getValue() {
        return value;
    }

}