/*
    * 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.basepom.mojo.duplicatefinder.classpath;
  
  import static com.google.common.base.Preconditions.checkArgument;
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import java.util.List;
  
  import com.google.common.base.Joiner;
  import com.google.common.collect.ImmutableList;
  
  /**
   * Manages the package in which resources and classes reside. Keeps track of the current package when traversing local folders for classes and resources.
   */
  class PackageNameHolder {
  
      private final ImmutableList<String> packages;
      private final String packageName;
      private final String path;
  
      PackageNameHolder(final List<String> packages) {
          this.packages = ImmutableList.copyOf(checkNotNull(packages, "packages is null"));
          this.packageName = Joiner.on('.').join(packages);
          this.path = Joiner.on('/').join(packages);
      }
  
      PackageNameHolder() {
          this.packages = ImmutableList.of();
          this.packageName = "";
          this.path = "";
      }
  
      PackageNameHolder getChildPackage(final String packageName) {
          checkNotNull(packageName, "packageName is null");
          checkArgument(packageName.length() > 0, "package name must have at least one character");
  
          return new PackageNameHolder(ImmutableList.<String>builder().addAll(packages).add(packageName).build());
      }
  
      String getQualifiedName(final String className) {
          checkNotNull(className, "className is null");
          return packages.isEmpty() ? className : packageName + "." + className;
      }
  
      String getQualifiedPath(final String className) {
          checkNotNull(className, "className is null");
          return packages.isEmpty() ? className : path + "/" + className;
      }
  
      @Override
      public String toString() {
          return getClass().getSimpleName() + "(" + packageName + ")";
      }
  }