FXMLControllerMembersInjector.java

/*
 * Copyright (C) 2012 The Cat Hive Developers.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cathive.fx.guice.fxml;

import java.lang.reflect.Field;

import com.cathive.fx.guice.FXMLController;
import com.cathive.fx.guice.controllerlookup.ControllerLookup;
import com.google.inject.MembersInjector;

/**
 * 
 * @author Benjamin P. Jung
 */
final class FXMLControllerMembersInjector<T> implements MembersInjector<T> {

    private final Field field;
    private final FXMLController annotation;
    private final FXMLLoadingScope scope;

    FXMLControllerMembersInjector(final Field field, final FXMLController annotation, final FXMLLoadingScope scope) {
        super();
        this.field = field;
        this.annotation = annotation;
        this.scope = scope;
        field.setAccessible(true);
    }

    @Override
    public void injectMembers(T instance) {
        Object controllerInstance = null;
        if (!annotation.controllerId().isEmpty()) {
            controllerInstance = new ControllerLookup(scope.getIdentifiables()).lookup(annotation.controllerId());
        } else {
            controllerInstance = scope.getInstance(annotation.controllerId());
        }
        if (controllerInstance == null) {
            throw new IllegalStateException("No suitable controller instance found!");
        }
        try {
            field.set(instance, controllerInstance);
        } catch (final IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

}