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/*
 * Copyright (c) 2003, PostgreSQL Global Development Group
 * See the LICENSE file in the project root for more information.
 */

package org.postgresql.core;

import org.checkerframework.checker.nullness.qual.Nullable;

import java.sql.SQLException;
import java.sql.SQLWarning;
import java.util.List;

/**
 * Internal to the driver class, please do not use in the application.
 *
 * The class simplifies creation of ResultHandler delegates: it provides default implementation
 * for the interface methods
 */
public class ResultHandlerDelegate implements ResultHandler {
  private final @Nullable ResultHandler delegate;

  public ResultHandlerDelegate(@Nullable ResultHandler delegate) {
    this.delegate = delegate;
  }

  @Override
  public void handleResultRows(Query fromQuery, Field[] fields, List tuples,
      @Nullable ResultCursor cursor) {
    if (delegate != null) {
      delegate.handleResultRows(fromQuery, fields, tuples, cursor);
    }
  }

  @Override
  public void handleCommandStatus(String status, long updateCount, long insertOID) {
    if (delegate != null) {
      delegate.handleCommandStatus(status, updateCount, insertOID);
    }
  }

  @Override
  public void handleWarning(SQLWarning warning) {
    if (delegate != null) {
      delegate.handleWarning(warning);
    }
  }

  @Override
  public void handleError(SQLException error) {
    if (delegate != null) {
      delegate.handleError(error);
    }
  }

  @Override
  public void handleCompletion() throws SQLException {
    if (delegate != null) {
      delegate.handleCompletion();
    }
  }

  @Override
  public void secureProgress() {
    if (delegate != null) {
      delegate.secureProgress();
    }
  }

  @Override
  public @Nullable SQLException getException() {
    if (delegate != null) {
      return delegate.getException();
    }
    return null;
  }

  @Override
  public @Nullable SQLWarning getWarning() {
    if (delegate != null) {
      return delegate.getWarning();
    }
    return null;
  }
}