/**
    * This file Copyright (c) 2015 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.resourceloader.classpath;
  
  import info.magnolia.resourceloader.AbstractResource;
  import info.magnolia.resourceloader.Resource;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import lombok.EqualsAndHashCode;
  
  /**
   * A {@link Resource} for {@link ClasspathResourceOrigin}.
   * @see ClasspathResourceOrigin
   */
  @EqualsAndHashCode(callSuper = true, exclude = { "parent", "children" })
  public class ClasspathResource extends AbstractResource {
      // TODO keep URL instead ?private final URL url;
      private final String realPath;
      private final boolean isFile;
  
      private ClasspathResource parent;
      private final Set<ClasspathResource> children;
  
      ClasspathResource(ClasspathResourceOrigin origin, String path, boolean isFile) {
          super(origin);
          if (!path.startsWith("/")) {
              throw new IllegalArgumentException("Path does not start with /: " + path);
          }
          this.realPath = path;
          this.isFile = isFile;
          this.children = !isFile ? new HashSet<ClasspathResource>() : null;
      }
  
      String getRealPath() {
          return realPath;
      }
  
      @Override
      public boolean isFile() {
          return isFile;
      }
  
      @Override
      public boolean isDirectory() {
          return !isFile;
      }
  
      /**
       * This implementation doesn't delegate parent-relationship to origin (as suggested by AbstractResource).
       */
      @Override
      public ClasspathResource getParent() {
          return parent;
      }
  
      void setParent(ClasspathResource parent) {
          if (this.equals(parent)) {
              throw new IllegalStateException("Cannot set self ClasspathResource as parent.");
          }
          if (this.parent != null) {
              throw new IllegalStateException("Parent is already set for " + this);
          }
          this.parent = parent;
          parent.addChild(this);
     }
 
     /**
      * This implementation doesn't delegate parent-relationship to origin (as suggested by AbstractResource).
      */
     @Override
     public List<Resource> listChildren() {
         if (isFile) {
             throw new IllegalStateException(getPath() + " is not a directory.");
         }
         return new ArrayList<Resource>(children);
     }
 
     public void setChildren(List<ClasspathResource> children) {
         if (children.contains(this)) {
             throw new IllegalStateException("Cannot add self ClasspathResource to children.");
         }
         this.children.clear();
         this.children.addAll(children);
     }
 
     public void addChild(ClasspathResource child) {
         if (this.equals(child)) {
             throw new IllegalStateException("Cannot add self ClasspathResource to children.");
         }
         children.add(child);
     }
 }