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JDBC Driver for Google Cloud Spanner
There is a newer version: 1.1.6
/*
 * Copyright 2016, Google Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in nl.topicus.jdbc.shaded.com.liance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.nl.topicus.jdbc.shaded.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 nl.topicus.jdbc.shaded.com.google.instrumentation.stats;

import nl.topicus.jdbc.shaded.com.google.instrumentation.nl.topicus.jdbc.shaded.com.on.Function;
import nl.topicus.jdbc.shaded.com.google.instrumentation.nl.topicus.jdbc.shaded.com.on.Timestamp;
import nl.topicus.jdbc.shaded.com.google.instrumentation.stats.ViewDescriptor.DistributionViewDescriptor;
import nl.topicus.jdbc.shaded.com.google.instrumentation.stats.ViewDescriptor.IntervalViewDescriptor;

import java.util.List;

/**
 * The aggregated data for a particular {@link ViewDescriptor}.
 */
public abstract class View {
  /**
   * The {@link ViewDescriptor} associated with this {@link View}.
   */
  public abstract ViewDescriptor getViewDescriptor();

  /**
   * Applies the given match function to the underlying data type.
   */
  public abstract  T match(
      Function p0,
      Function p1);

  // Prevents this class from being subclassed anywhere else.
  private View() {
  }

  /**
   * A {@link View} for distribution-based aggregations.
   */
  public static final class DistributionView extends View {
    /**
     * Constructs a new {@link DistributionView}.
     */
    public static DistributionView create(DistributionViewDescriptor distributionViewDescriptor,
        List distributionAggregations, Timestamp start, Timestamp end) {
      return new DistributionView(distributionViewDescriptor, distributionAggregations, start, end);
    }

    /**
     * The {@link DistributionAggregation}s associated with this {@link DistributionView}.
     *
     * Note: The returned list is unmodifiable, attempts to update it will throw an
     * UnsupportedOperationException.
     */
    public List getDistributionAggregations() {
      return distributionAggregations;
    }

    /**
     * Returns start timestamp for this aggregation.
     */
    public Timestamp getStart() {
      return start;
    }

    /**
     * Returns end timestamp for this aggregation.
     */
    public Timestamp getEnd() {
      return end;
    }

    @Override
    public DistributionViewDescriptor getViewDescriptor() {
      return distributionViewDescriptor;
    }

    @Override
    public  T match(
        Function p0,
        Function p1) {
      return p0.apply(this);
    }

    private final DistributionViewDescriptor distributionViewDescriptor;
    private final List distributionAggregations;
    private final Timestamp start;
    private final Timestamp end;

    private DistributionView(DistributionViewDescriptor distributionViewDescriptor,
        List distributionAggregations, Timestamp start, Timestamp end) {
      this.distributionViewDescriptor = distributionViewDescriptor;
      this.distributionAggregations = distributionAggregations;
      this.start = start;
      this.end = end;
    }
  }

  /**
   * A {@link View} for interval-base aggregations.
   */
  public static final class IntervalView extends View {
    /**
     * Constructs a new {@link IntervalView}.
     */
    public static IntervalView create(IntervalViewDescriptor intervalViewDescriptor,
        List intervalAggregations) {
      return new IntervalView(intervalViewDescriptor, intervalAggregations);
    }

    /**
     * The {@link IntervalAggregation}s associated with this {@link IntervalView}.
     *
     * Note: The returned list is unmodifiable, attempts to update it will throw an
     * UnsupportedOperationException.
     */
    public List getIntervalAggregations() {
      return intervalAggregations;
    }

    @Override
    public IntervalViewDescriptor getViewDescriptor() {
      return intervalViewDescriptor;
    }

    @Override
    public  T match(
        Function p0,
        Function p1) {
      return p1.apply(this);
    }

    private final IntervalViewDescriptor intervalViewDescriptor;
    private final List intervalAggregations;

    private IntervalView(IntervalViewDescriptor intervalViewDescriptor,
        List intervalAggregations) {
      this.intervalViewDescriptor = intervalViewDescriptor;
      this.intervalAggregations = intervalAggregations;
    }
  }
}