/*
 * Copyright 2019 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.kie.kogito.rules;

import java.util.function.Consumer;

import org.kie.api.runtime.rule.FactHandle;

public interface DataObserver {

    static <T> DataProcessor<T> of(Consumer<T> consumer) {
        return new DataProcessor<T>() {
            @Override
            public FactHandle insert(DataHandle handle, T object) {
                consumer.accept(object);
                return null;
            }

            @Override
            public void update(DataHandle handle, T object) {

            }

            @Override
            public void delete(DataHandle handle) {

            }
        };
    }

    static <T> DataProcessor<T> ofUpdatable(Consumer<T> consumer) {
        return new DataProcessor<T>() {
            @Override
            public FactHandle insert(DataHandle handle, T object) {
                consumer.accept(object);
                return null;
            }

            @Override
            public void update(DataHandle handle, T object) {
                consumer.accept(object);
            }

            @Override
            public void delete(DataHandle handle) {
                consumer.accept(null);
            }
        };
    }
}
