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Java Simplified. Extensions and Useful Constructs for the Java Platform. Codeprimate Elements (a.k.a. cp-elements) is a Java library and micro-framework used to simplify the development of software applications written in Java. Elements packages several APIs into one library in order to address various application concerns and aspects of software design and development collectively and conveniently. Elements is a highly simple, yet robust and proven library built on solid OO principles, software design patterns and best practices to effectively solve common and reoccurring problems in software development.

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/*
 * Copyright 2016 Author or Authors.
 *
 * 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.
 */

package org.cp.elements;

import java.time.LocalDate;
import java.util.Optional;
import java.util.Properties;

import org.cp.elements.io.IOUtils;
import org.cp.elements.lang.StringUtils;

/**
 * The {@link ElementsVersion} class declares the version of the Codeprimate Elements project.
 *
 * @author John Blum
 * @see java.lang.Runnable
 * @since 1.0.0
 */
@SuppressWarnings("unused")
public class ElementsVersion implements Runnable {

  public static final int DEFAULT_YEAR = 2011;

  protected static final String MAVEN_PROPERTIES_FILE_LOCATION =
    "META-INF/maven/org.codeprimate/cp-elements/pom.properties";

  protected static final String MAVEN_ARTIFACT_ID_PROPERTY = "artifactId";
  protected static final String MAVEN_GROUP_ID_PROPERTY = "groupId";
  protected static final String MAVEN_VERSION_PROPERTY = "version";

  public static final String PROJECT_ARTIFACT_ID = "cp-elements";
  public static final String PROJECT_LICENSE = "Apache License, version 2.0";
  public static final String PROJECT_NAME = "Codeprimate Elements";
  public static final String PROJECT_VERSION = "version 1.0.0.M4";

  private Properties maven;

  public static void main(String[] args) {
    new ElementsVersion().run();
  }

  @Override
  public void run() {
    log("%1$s (%2$s) %3$s - Copyright \u00A9 %4$d%n%5$s%n", PROJECT_NAME, resolveProjectArtifactId(),
      resolveProjectVersion(), resolveYear(), PROJECT_LICENSE);
  }

  private Properties loadMavenProperties() {

    Properties maven = new Properties();

    Optional.ofNullable(ElementsVersion.class.getResourceAsStream(MAVEN_PROPERTIES_FILE_LOCATION))
      .ifPresent(inputStream -> IOUtils.doSafeIo(() -> maven.load(inputStream)));

    return maven;
  }

  private void log(String message, Object... args) {
    System.err.printf(message, args);
    System.err.flush();
  }

  private Properties resolveMavenProperties() {
    return Optional.ofNullable(maven).orElseGet(() -> maven = loadMavenProperties());
  }

  private String resolveProjectArtifactId() {
    return resolveProjectArtifactId(PROJECT_ARTIFACT_ID);
  }

  private String resolveProjectArtifactId(String defaultArtifactId) {

    return Optional.ofNullable(resolveMavenProperties().getProperty(MAVEN_ARTIFACT_ID_PROPERTY))
      .filter(StringUtils::hasText)
      .orElse(defaultArtifactId);
  }

  private String resolveProjectVersion() {
    return resolveProjectVersion(PROJECT_VERSION);
  }

  private String resolveProjectVersion(String defaultVersion) {

    return Optional.ofNullable(resolveMavenProperties().getProperty(MAVEN_VERSION_PROPERTY))
      .filter(StringUtils::hasText)
      .orElse(defaultVersion);
  }

  private int resolveYear() {
    return resolveYear(DEFAULT_YEAR);
  }

  private int resolveYear(int defaultYear) {
    return LocalDate.now().getYear();
  }
}