content: /*
   * Copyright 2010, 2011, 2012 mapsforge.org
   * Copyright 2013 Hannes Janetzek
   * Copyright 2016-2017 devemux86
   * Copyright 2017 Andrey Novikov
   *
   * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
   *
   * This program is free software: you can redistribute it and/or modify it under the
   * terms of the GNU Lesser General Public License as published by the Free Software
   * Foundation, either version 3 of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT ANY
   * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License along with
   * this program. If not, see <http://www.gnu.org/licenses/>.
   */
  package org.oscim.theme;
  
  import org.oscim.theme.IRenderTheme.ThemeException;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.InputStream;
  
  /**
   * An ExternalRenderTheme allows for customizing the rendering style of the map
   * via an XML file.
   */
  public class ExternalRenderTheme implements ThemeFile {
      private static final long serialVersionUID = 1L;
  
      private final long mFileModificationDate;
      private XmlRenderThemeMenuCallback mMenuCallback;
      private final String mPath;
  
      /**
       * @param fileName the path to the XML render theme file.
       * @throws ThemeException if the file does not exist or cannot be read.
       */
      public ExternalRenderTheme(String fileName) throws ThemeException {
          this(fileName, null);
      }
  
      /**
       * @param fileName     the path to the XML render theme file.
       * @param menuCallback the interface callback to create a settings menu on the fly.
       * @throws ThemeException if the file does not exist or cannot be read.
       */
      public ExternalRenderTheme(String fileName, XmlRenderThemeMenuCallback menuCallback) throws ThemeException {
          File themeFile = new File(fileName);
          if (!themeFile.exists()) {
              throw new ThemeException("file does not exist: " + themeFile.getAbsolutePath());
          } else if (!themeFile.isFile()) {
              throw new ThemeException("not a file: " + fileName);
          } else if (!themeFile.canRead()) {
              throw new ThemeException("cannot read file: " + fileName);
          }
  
          mFileModificationDate = themeFile.lastModified();
          if (mFileModificationDate == 0L) {
              throw new ThemeException("cannot read last modification time");
          }
          mPath = fileName;
          mMenuCallback = menuCallback;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          } else if (!(obj instanceof ExternalRenderTheme)) {
              return false;
          }
          ExternalRenderTheme other = (ExternalRenderTheme) obj;
          if (mFileModificationDate != other.mFileModificationDate) {
              return false;
          } else if (mPath == null && other.mPath != null) {
              return false;
          } else if (mPath != null && !mPath.equals(other.mPath)) {
              return false;
          }
          return true;
      }
  
      @Override
      public XmlRenderThemeMenuCallback getMenuCallback() {
          return mMenuCallback;
      }
  
      @Override
      public String getRelativePathPrefix() {
          return new File(mPath).getParent();
      }
  
      @Override
      public InputStream getRenderThemeAsStream() throws ThemeException {
          InputStream is;
  
          try {
              is = new FileInputStream(mPath);
          } catch (FileNotFoundException e) {
              throw new ThemeException(e.getMessage());
          }
          return is;
      }
  
      @Override
      public boolean isMapsforgeTheme() {
          return ThemeUtils.isMapsforgeTheme(this);
      }
  
      @Override
      public void setMenuCallback(XmlRenderThemeMenuCallback menuCallback) {
          mMenuCallback = menuCallback;
      }
  }
  