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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 2012-2016 the original author or authors.
 */
package org.assertj.db.api.assertions.impl;

import static org.assertj.db.error.ShouldBeValueClass.shouldBeValueClass;

import java.util.List;

import org.assertj.core.api.WritableAssertionInfo;
import org.assertj.core.internal.Failures;
import org.assertj.db.api.AbstractAssert;
import org.assertj.db.exception.AssertJDBException;
import org.assertj.db.type.Value;

/**
 * Implements the assertion methods on the class of a column.
 *
 * @author Régis Pouiller
 * @see org.assertj.db.api.assertions.AssertOnColumnClass
 */
public class AssertionsOnColumnClass {

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

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

  /**
   * Verifies that the class of the values of the column is equal to the class 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 valuesList The list of values.
   * @param expected   The expected class to compare to.
   * @param lenient    {@code true} if the test is lenient : if the class of a value is not identified (for example when the
   *                   value is {@code null}), it consider that it is ok.
   * @return {@code this} assertion object.
   * @throws AssertionError     If the class of the column is different to the class in parameter.
   * @throws AssertJDBException If the class is {@code null}.
   * @since 1.1.0
   */
  public static > A isOfClass(A assertion, WritableAssertionInfo info, List valuesList,
                                                       Class expected, boolean lenient) {

    if (expected == null) {
      throw new AssertJDBException("Class of the column is null");
    }

    int index = 0;
    for (Value value : valuesList) {
      Object object = value.getValue();
      if (object == null || !expected.isAssignableFrom(object.getClass())) {
        if (!lenient || object != null) {
          throw failures.failure(info, shouldBeValueClass(index, value, expected));
        }
      }
      index++;
    }
    return assertion;
  }
}

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