ea57934db6
* Moves converter pattern to Java 11 * Moves cqrs pattern to Java 11 * Moves dao pattern to Java 11 * Moves data-bus pattern to Java 11 * Moves data-locality pattern to Java 11 * Moves data-mapper pattern to Java 11 * Moves data-transfer-object pattern to Java 11 * Moves decorator pattern to Java 11 * Moves delegation pattern to Java 11 * Moves dependency-injection to Java 11 * Moves dirty-flag to Java 11 * Moves double-buffer to Java 11 * Moves double-checked-locking to Java 11 * Moves double-dispatch to Java 11 * Corrects with changes thats breaking test cases
77 lines
2.8 KiB
Java
77 lines
2.8 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.datamapper;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Optional;
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/**
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* Implementation of Actions on Students Data.
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*/
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public final class StudentDataMapperImpl implements StudentDataMapper {
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/* Note: Normally this would be in the form of an actual database */
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private List<Student> students = new ArrayList<>();
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@Override
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public Optional<Student> find(int studentId) {
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return this.getStudents().stream().filter(x -> x.getStudentId() == studentId).findFirst();
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}
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@Override
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public void update(Student studentToBeUpdated) throws DataMapperException {
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String name = studentToBeUpdated.getName();
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Integer index = Optional.of(studentToBeUpdated)
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.map(Student::getStudentId)
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.flatMap(this::find)
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.map(students::indexOf)
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.orElseThrow(() -> new DataMapperException("Student [" + name + "] is not found"));
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students.set(index, studentToBeUpdated);
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}
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@Override
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public void insert(Student studentToBeInserted) throws DataMapperException {
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Optional<Student> student = find(studentToBeInserted.getStudentId());
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if (student.isPresent()) {
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String name = studentToBeInserted.getName();
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throw new DataMapperException("Student already [" + name + "] exists");
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}
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students.add(studentToBeInserted);
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}
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@Override
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public void delete(Student studentToBeDeleted) throws DataMapperException {
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if (!students.remove(studentToBeDeleted)) {
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String name = studentToBeDeleted.getName();
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throw new DataMapperException("Student [" + name + "] is not found");
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}
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}
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public List<Student> getStudents() {
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return this.students;
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}
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}
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