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JDBC client implementation over Table client, single jar

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/*
 * Copyright 2019 The gRPC Authors
 *
 * 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 io.grpc.internal;

import java.util.ArrayList;
import javax.annotation.Nullable;

/**
 * Builds a concise and readable string that gives insight of the concerned part of the system.  The
 * resulted string is made up of a list of short strings, each of which gives out a piece of
 * information.
 */
public final class InsightBuilder {
  private final ArrayList buffer = new ArrayList<>();

  /**
   * Appends a piece of information which is a plain string.  The given object is immediately
   * converted to string and recorded.
   */
  public InsightBuilder append(@Nullable Object insight) {
    buffer.add(String.valueOf(insight));
    return this;
  }

  /**
   * Appends a piece of information which is a key-value , which will be formatted into {@code
   * "key=value"}.  Value's {@code toString()} or {@code null} is immediately recorded.
   */
  public InsightBuilder appendKeyValue(String key, @Nullable Object value) {
    buffer.add(key + "=" + value);
    return this;
  }

  /**
   * Get the resulting string.
   */
  @Override
  public String toString() {
    return buffer.toString();
  }
}