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import org.spongepowered.api.Sponge;
import org.spongepowered.api.data.value.ValueFactory;
import org.spongepowered.api.data.value.mutable.Value;

import org.spongepowered.cookbook.myhomes.data.home.Home;
import org.spongepowered.cookbook.myhomes.data.Keys;

@Override
protected Value<Home> defaultHome() {
    return Sponge.getRegistry().getValueFactory()
            .createValue(Keys.DEFAULT_HOME, getValue(), null);
}

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import org.spongepowered.api.data.DataQuery;
import org.spongepowered.api.data.key.Key;
import org.spongepowered.api.data.key.KeyFactory;
import org.spongepowered.api.data.value.mutable.Value;
import org.spongepowered.api.data.value.mutable.Value;

import com.google.common.reflect.TypeToken;

import org.spongepowered.cookbook.myhomes.data.home.Home;

public static final Key<Value<Home>> DEFAULT_HOME = KeyFactory.makeSingleKey(
        TypeToken.of(Home.class),
        new TypeToken<Value<Home>>() {},
        DataQuery.of("DefaultHome"), "myhomes:default_home", "Default Home");

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import org.spongepowered.api.data.DataContainer;

import org.spongepowered.cookbook.myhomes.data.Keys;

@Override
public DataContainer toContainer() {
    DataContainer container = super.toContainer();
    // This is the simplest, but use whatever structure you want!
    container.set(Keys.DEFAULT_HOME.getQuery(), this.defaultHome);
    container.set(Keys.HOMES, this.homes);

    return container;
}

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import org.spongepowered.api.data.DataHolder;
import org.spongepowered.api.data.merge.MergeFunction;

import org.spongepowered.cookbook.myhomes.data.friends.FriendsData;

import java.util.Optional;

@Override
public Optional<FriendsData> fill(DataHolder dataHolder, MergeFunction overlap) {
    FriendsData merged = overlap.merge(this, dataHolder.get(FriendsData.class).orElse(null));
    setValue(merged.friends().get());

    return Optional.of(this);
}

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import org.spongepowered.api.data.DataContainer;
import org.spongepowered.api.data.DataQuery;

import org.spongepowered.cookbook.myhomes.data.Keys;
import org.spongepowered.cookbook.myhomes.data.friends.FriendsData;
import org.spongepowered.cookbook.myhomes.data.friends.ImmutableFriendsData;

import com.google.common.collect.Maps;

import java.util.Optional;
import java.util.UUID;

@Override
public Optional<FriendsData> from(DataContainer container) {
    if(container.contains(Keys.FRIENDS)) {
        List<UUID> friends = container.getObjectList(Keys.FRIENDS.getQuery(), UUID.class).get();
        return Optional.of(setValue(friends));
    }

    return Optional.empty();
}

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import org.spongepowered.cookbook.myhomes.data.friends.FriendsData;

@Override
public FriendsData copy() {
    return new FriendsDataImpl(getValue());
}

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import org.spongepowered.cookbook.myhomes.data.Keys

// registerGetters() for immutable implementation
@Override
protected void registerGettersAndSetters() {
    registerKeyValue(Keys.DEFAULT_HOME, this::defaultHome);
    registerKeyValue(Keys.HOMES, this::homes);

    registerFieldGetter(Keys.DEFAULT_HOME, this::getDefaultHome);
    registerFieldGetter(Keys.HOMES, this::getHomes);

    // Only on mutable implementation
    registerFieldSetter(Keys.DEFAULT_HOME, this::setDefaultHome);
    registerFieldSetter(Keys.HOMES, this::setHomes);
}

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