NamedMapBinding.java

package com.netflix.fabricator.guice.mapping;

import com.google.inject.Binding;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.util.Types;
import com.netflix.fabricator.ConfigurationNode;

import java.lang.reflect.Method;
import java.util.Map;

/**
 * Look for a named component in a map binding : Map<String, T>
 * 
 * Created by hyuan on 1/16/14.
 */
public class NamedMapBinding implements BindingReslove {
    @Override
    public boolean execute(String name, Object obj, ConfigurationNode config, Class<?> argType, Injector injector, Method method) throws Exception {
        // Look for a MapBinder binding
        TypeLiteral<Map<String, ?>> mapLiteral = (TypeLiteral<Map<String, ?>>) TypeLiteral.get(
                Types.mapOf(String.class, argType));
        Binding<Map<String, ?>> mapBinding = injector.getExistingBinding(Key.get(mapLiteral));
        if (mapBinding != null) {
            Map<String, ?> map = mapBinding.getProvider().get();
            if (map.containsKey(name)) {
                method.invoke(obj, map.get(name));
                return true;
            }
        }
        return false;
    }
}