/**
 * Copyright (C) 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.jboss.errai.common.client.ui;

import java.util.IdentityHashMap;
import java.util.Map;

/**
 *
 * @author Max Barkley <mbarkley@redhat.com>
 */
public class NativeHasValueAccessors {

  public static interface Accessor<T> {
    T get();
    void set(T value);
  }

  private static final Map<Object, Accessor<?>> instanceAccessors = new IdentityHashMap<>();

  public static void registerAccessor(final Object instance, final Accessor<?> accessor) {
    instanceAccessors.put(instance, accessor);
  }

  public static Accessor<?> getAccessor(final Object instance) {
    final Accessor<?> accessor = instanceAccessors.get(instance);
    if (accessor == null) {
      throw new RuntimeException("No accessor found for " + instance);
    }
    else {
      return accessor;
    }
  }

  public static boolean hasValueAccessor(final Object instance) {
    return instanceAccessors.containsKey(instance);
  }

  private NativeHasValueAccessors() {}

}
