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/*
 * 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.github.dm.jrt.function;

import com.github.dm.jrt.channel.OutputConsumer;
import com.github.dm.jrt.channel.RoutineException;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Utility class used to build output consumer based on consumer functions.
 * 
 * Created by davide-maestroni on 09/21/2015.
 *
 * @param  the output data type.
 */
public class OutputConsumerBuilder implements OutputConsumer {

    private final ConsumerWrapper mOnComplete;

    private final ConsumerWrapper mOnError;

    private final ConsumerWrapper mOnOutput;

    /**
     * Constructor.
     *
     * @param onComplete the complete consumer.
     * @param onError    the error consumer.
     * @param onOutput   the output consumer.
     */
    @SuppressWarnings("ConstantConditions")
    OutputConsumerBuilder(@NotNull final ConsumerWrapper onComplete,
            @NotNull final ConsumerWrapper onError,
            @NotNull final ConsumerWrapper onOutput) {

        if (onComplete == null) {

            throw new NullPointerException("the complete consumer must not be null");
        }

        if (onError == null) {

            throw new NullPointerException("the error consumer must not be null");
        }

        if (onOutput == null) {

            throw new NullPointerException("the output consumer must not be null");
        }

        mOnOutput = onOutput;
        mOnError = onError;
        mOnComplete = onComplete;
    }

    /**
     * Returns a new output consumer builder employing also the specified consumer function to
     * handle the invocation completion.
     *
     * @param consumer the consumer function.
     * @return the builder instance.
     */
    @NotNull
    public OutputConsumerBuilder andThenComplete(@NotNull final Consumer consumer) {

        return new OutputConsumerBuilder(mOnComplete.andThen(consumer), mOnError, mOnOutput);
    }

    /**
     * Returns a new output consumer builder employing also the specified consumer function to
     * handle the invocation errors.
     *
     * @param consumer the consumer function.
     * @return the builder instance.
     */
    @NotNull
    public OutputConsumerBuilder andThenError(
            @NotNull final Consumer consumer) {

        return new OutputConsumerBuilder(mOnComplete, mOnError.andThen(consumer), mOnOutput);
    }

    /**
     * Returns a new output consumer builder employing also the specified consumer function to
     * handle the invocation outputs.
     *
     * @param consumer the consumer function.
     * @return the builder instance.
     */
    @NotNull
    public OutputConsumerBuilder andThenOutput(@NotNull final Consumer consumer) {

        return new OutputConsumerBuilder(mOnComplete, mOnError, mOnOutput.andThen(consumer));
    }

    public void onComplete() {

        mOnComplete.accept(null);
    }

    public void onError(@Nullable final RoutineException error) {

        mOnError.accept(error);
    }

    public void onOutput(final OUT output) {

        mOnOutput.accept(output);
    }
}