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TRAC D.A.P. data library, interfaces and core functionality for working with primary data

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/*
 * Licensed to the Fintech Open Source Foundation (FINOS) under one or
 * more contributor license agreements. See the NOTICE file distributed
 * with this work for additional information regarding copyright ownership.
 * FINOS licenses this file to you 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.finos.tracdap.common.data.pipeline;

import org.finos.tracdap.common.data.DataPipeline;
import org.finos.tracdap.common.exception.EUnexpected;


public abstract class BaseDataProducer
        >
        extends BaseDataStage
        implements DataPipeline.DataProducer {

    private final Class consumerType;
    private DataPipeline.DataConsumer consumer;

    protected BaseDataProducer(Class consumerType) {
        this.consumerType = consumerType;
    }

    @SuppressWarnings("unchecked")
    final void bind(DataPipeline.DataConsumer consumer) {

        if (!consumerType.isAssignableFrom(consumer.dataInterface().getClass()))
            throw new EUnexpected();

        this.consumer = (DataPipeline.DataConsumer) consumer;
    }

    @Override
    public Class consumerType() {
        return consumerType;
    }

    @Override
    public final boolean consumerReady() {
        return consumer.isReady();
    }

    @Override
    public final API_T consumer() {
        return consumer.dataInterface();
    }
}