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AssertJ-DB - Rich and fluent assertions for testing with database

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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.
 *
 * Copyright 2012-2015 the original author or authors.
 */
package org.assertj.db.api.assertions.impl;

import org.assertj.core.api.WritableAssertionInfo;
import org.assertj.core.internal.Failures;
import org.assertj.db.api.AbstractAssert;

import static org.assertj.db.error.ShouldHaveColumnsSize.shouldHaveColumnsSize;

/**
 * Implements the assertion method on the number of columns.
 *
 * @author Régis Pouiller
 * @see org.assertj.db.api.assertions.AssertOnNumberOfColumns
 */
public class AssertionsOnNumberOfColumns {

  /**
   * To notice failures in the assertion.
   */
  private final static Failures failures = Failures.instance();

  /**
   * Private constructor.
   */
  private AssertionsOnNumberOfColumns() {
    // Empty
  }

  /**
   * Verifies that the number of columns is equal to the number in parameter.
   *
   * @param        The type of the assertion which call this method.
   * @param assertion The assertion which call this method.
   * @param info      Writable information about an assertion.
   * @param size      The size of the row.
   * @param expected  The number to compare to the size.
   * @return {@code this} assertion object.
   * @throws AssertionError If the number of columns is different to the number in parameter.
   */
  public static  A hasNumberOfColumns(A assertion, WritableAssertionInfo info, int size,
                                                                int expected) {
    if (size != expected) {
      throw failures.failure(info, shouldHaveColumnsSize(size, expected));
    }
    return assertion;
  }
}

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