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A hierarchy model builder with view mapper

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package com.github.phantomthief.model.builder.impl;

import java.util.Collection;
import java.util.Map;
import java.util.function.BiFunction;
import java.util.function.Function;

import com.github.phantomthief.model.builder.impl.SimpleModelBuilder.Lazy;

/**
 * @author w.vela
 */
public class LazyBuilder {

    public static  Lazy on(Object sourceNamespace, Function, Map> builder,
            Object targetNamespace) {
        return new Lazy() {

            @Override
            public Object sourceNamespace() {
                return sourceNamespace;
            }

            @Override
            public Object targetNamespace() {
                return targetNamespace;
            }

            @SuppressWarnings({ "unchecked", "rawtypes" })
            @Override
            public BiFunction builder() {
                return (context, ids) -> ((Function) builder).apply(ids);
            }
        };
    }

    public static  Lazy on(Object sourceNamespace,
            BiFunction, Map> builder, Object targetNamespace) {
        return new Lazy() {

            @Override
            public Object sourceNamespace() {
                return sourceNamespace;
            }

            @Override
            public Object targetNamespace() {
                return targetNamespace;
            }

            @Override
            public BiFunction builder() {
                return builder;
            }
        };
    }
}