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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.navigation;

import org.assertj.db.navigation.element.ColumnElement;

/**
 * Defines methods to navigate to a modified {@link org.assertj.db.type.Column} from a {@link org.assertj.db.type.Change}.
 * The different methods return an assertion on one column {@link org.assertj.db.navigation.element.ColumnElement}.
 * These methods exists when navigating (at the beginning {@code assertThat()}) from changes.
 * The difference with {@link ToColumn} is that {@link ToColumn}
 * allows to navigate in all the columns of a {@link org.assertj.db.type.Change} and the methods
 * of {@link ToColumnFromChange} count only the columns
 * with a modification between the start point and the end point.
 * 
 * As shown in the diagram below, it is possible to call the method to navigate to a {@link org.assertj.db.navigation.element.ColumnElement} from :
 * 
 *     a change ({@link org.assertj.db.api.ChangeAssert})
 *     a column of a change ({@link org.assertj.db.api.ChangeColumnAssert})
 *     a value of a column of a change ({@link org.assertj.db.api.ChangeColumnValueAssert})
 *     a row of a change ({@link org.assertj.db.api.ChangeRowAssert})
 *     a value of a row of a change ({@link org.assertj.db.api.ChangeRowValueAssert})
 * 
 * 
 * 
 * 
 * It is important to keep in mind that the methods are executed from the point of view of the last instance with assertion methods on a change ({@link org.assertj.db.api.ChangeAssert}).

 * So all the lines of code below are equivalent : they point on the column at index 1 (as usual, the list start at index 0) among the modified columns.
 * 
 *  * 
 * assertThat(changes).change().columnAmongTheModifiedOnes(1)......;                                                    // Point directly on the column at index 1
 * // Use the returnToChange() method to return on the change and access to the next/second column of the list
 * assertThat(changes).change().columnAmongTheModifiedOnes().returnToChange().columnAmongTheModifiedOnes()......;
 * assertThat(changes).change().columnAmongTheModifiedOnes().columnAmongTheModifiedOnes()......;                        // Same as precedent but returnToChange() is implicit
 * assertThat(changes).change().column().columnAmongTheModifiedOnes(1)......;                                           // The method with the index can be call too
 * assertThat(changes).change().columnAmongTheModifiedOnes(2).column(0).columnAmongTheModifiedOnes(1)......;            // Idem
 * assertThat(changes).change().columnAmongTheModifiedOnes().value().columnAmongTheModifiedOnes()......;
 * assertThat(changes).change().column().value().columnAmongTheModifiedOnes(1)......;
 * // Equivalent to the precedent but with the use of the methods to return to origin
 * assertThat(changes).change().columnAmongTheModifiedOnes().value().returnToColumn().returnToChange().columnAmongTheModifiedOnes(1)......;
 * 
 * 
 *
 * @author Régis Pouiller
 *
 * @param  The class of a assertion on a column (an sub-class of {@link org.assertj.db.navigation.element.ColumnElement}).
 */
public interface ToColumnFromChange extends Navigation {

  /**
   * Returns assertion methods on the next {@link org.assertj.db.type.Column} in the list of the modified {@link org.assertj.db.type.Column}s.
   *
   * @return An object to make assertions on the {@link org.assertj.db.type.Column}.
   * @throws org.assertj.db.exception.AssertJDBException If there are no more {@link org.assertj.db.type.Column} among the list of modified {@link org.assertj.db.type.Column}s.
   * @see org.assertj.db.api.ChangeAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeColumnAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeColumnValueAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeRowAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeRowValueAssert#columnAmongTheModifiedOnes(String)
   */
  C columnAmongTheModifiedOnes();

  /**
   * Returns assertion methods on the {@link org.assertj.db.type.Column} at the {@code index} in parameter among the modified {@link org.assertj.db.type.Column}s.
   *
   * @param index The index corresponding to the {@link org.assertj.db.type.Column} among the list of modified {@link org.assertj.db.type.Column}s..
   * @return An object to make assertions on the {@link org.assertj.db.type.Column}.
   * @throws org.assertj.db.exception.AssertJDBException If the {@code index} is out of the bounds.
   * @see org.assertj.db.api.ChangeAssert#columnAmongTheModifiedOnes(int)
   * @see org.assertj.db.api.ChangeColumnAssert#columnAmongTheModifiedOnes(int)
   * @see org.assertj.db.api.ChangeColumnValueAssert#columnAmongTheModifiedOnes(int)
   * @see org.assertj.db.api.ChangeRowAssert#columnAmongTheModifiedOnes(int)
   * @see org.assertj.db.api.ChangeRowValueAssert#columnAmongTheModifiedOnes(int)
   */
  C columnAmongTheModifiedOnes(int index);

  /**
   * Returns assertion methods on the {@link org.assertj.db.type.Column} corresponding to the column name in parameter among the modified {@link org.assertj.db.type.Column}s.
   *
   * @param columnName The column name.
   * @return An object to make assertions on the {@link org.assertj.db.type.Column}.
   * @throws NullPointerException                        If the column name in parameter is {@code null}.
   * @throws org.assertj.db.exception.AssertJDBException If there is no column with this name  among the list of modified {@link org.assertj.db.type.Column}s.
   * @see org.assertj.db.api.ChangeAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeColumnAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeColumnValueAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeRowAssert#columnAmongTheModifiedOnes(String)
   * @see org.assertj.db.api.ChangeRowValueAssert#columnAmongTheModifiedOnes(String)
   */
  C columnAmongTheModifiedOnes(String columnName);
}