com.openpojo.reflection.java.packageloader.utils.PackageNameHelper Maven / Gradle / Ivy

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This project was born out of a need to validate all POJOs (Plain Old Java Object) are behaving correctly. This project has two main aspects to it: * Make Testing as easy as possible. * Simplifying identity management (hashCode / equals) using annotation.

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/*
 * Copyright (c) 2010-2015 Osman Shoukry
 *
 * 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 com.openpojo.reflection.java.packageloader.utils;

import com.openpojo.reflection.java.Java;

/**
 * @author oshoukry
 */
public class PackageNameHelper {

  /**
   * This method breaks up a package path into its elements returning the first sub-element only.
   * For example, if packageName is "com" and the JAR file has only one class
   * "com.openpojo.reflection.SomeClass.class", then the return will be set to "com.openpojo".
   *
   * @param parentPackageName
   *     The reference package name.
   * @param subPackageName
   *     The subpackage name.
   * @return A first sub level bellow packageName.
   */
  public static String getDirectSubPackageName(final String parentPackageName, final String subPackageName) {
    String parentPackageNameAsPath = parentPackageName + Java.PACKAGE_DELIMITER;
    if (subPackageName.startsWith(parentPackageNameAsPath) && subPackageName.length() > parentPackageNameAsPath.length()) {
      String[] subPackageTokens;
      subPackageTokens = subPackageName.substring(parentPackageNameAsPath.length()).split("\\" + Java.PACKAGE_DELIMITER);
      if (subPackageTokens.length > 0) {
        return parentPackageName + Java.PACKAGE_DELIMITER + subPackageTokens[0];
      }
    }
    return null;
  }
}