content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * 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 dev.dworks.apps.anexplorer.cursor;
  
  import static dev.dworks.apps.anexplorer.DocumentsActivity.TAG;
  import static dev.dworks.apps.anexplorer.model.DocumentInfo.getCursorLong;
  import static dev.dworks.apps.anexplorer.model.DocumentInfo.getCursorString;
  import android.database.AbstractCursor;
  import android.database.Cursor;
  import android.os.Bundle;
  import android.text.TextUtils;
  import android.util.Log;
  import dev.dworks.apps.anexplorer.misc.MimePredicate;
  import dev.dworks.apps.anexplorer.model.DocumentsContract.Document;
  
  /**
   * Cursor wrapper that filters MIME types not matching given list.
   */
  public class FilteringCursorWrapper extends AbstractCursor {
      private final Cursor mCursor;
  
      private final int[] mPosition;
      private int mCount;
  
      public FilteringCursorWrapper(Cursor cursor, String[] acceptMimes) {
          this(cursor, acceptMimes, null, Long.MIN_VALUE);
      }
  
      public FilteringCursorWrapper(Cursor cursor, String[] acceptMimes, String[] rejectMimes) {
          this(cursor, acceptMimes, rejectMimes, Long.MIN_VALUE);
      }
  
      public FilteringCursorWrapper(
              Cursor cursor, String[] acceptMimes, String[] rejectMimes, long rejectBefore) {
          mCursor = cursor;
  
          final int count = cursor.getCount();
          mPosition = new int[count];
  
          cursor.moveToPosition(-1);
          while (cursor.moveToNext() && mCount < count) {
              final String mimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
              final String name = getCursorString(cursor, Document.COLUMN_DISPLAY_NAME);
              final long lastModified = getCursorLong(cursor, Document.COLUMN_LAST_MODIFIED);
              if (rejectMimes != null && MimePredicate.mimeMatches(rejectMimes, mimeType)) {
                  continue;
              }
              if (lastModified < rejectBefore) {
                  continue;
              }
  
              if (MimePredicate.mimeMatches(acceptMimes, mimeType)) {
                  mPosition[mCount++] = cursor.getPosition();
              }
          }
  
          Log.d(TAG, "Before filtering " + cursor.getCount() + ", after " + mCount);
      }
  
      @Override
      public Bundle getExtras() {
          return mCursor.getExtras();
      }
  
      @Override
      public void close() {
          super.close();
          mCursor.close();
      }
  
      @Override
      public boolean onMove(int oldPosition, int newPosition) {
          return mCursor.moveToPosition(mPosition[newPosition]);
      }
  
      @Override
      public String[] getColumnNames() {
          return mCursor.getColumnNames();
      }
  
      @Override
      public int getCount() {
          return mCount;
      }
  
      @Override
      public double getDouble(int column) {
          return mCursor.getDouble(column);
      }
  
      @Override
      public float getFloat(int column) {
          return mCursor.getFloat(column);
      }
  
      @Override
      public int getInt(int column) {
          return mCursor.getInt(column);
      }
  
      @Override
      public long getLong(int column) {
          return mCursor.getLong(column);
      }
  
      @Override
      public short getShort(int column) {
          return mCursor.getShort(column);
      }
  
      @Override
      public String getString(int column) {
          return mCursor.getString(column);
      }
  
      @Override
      public int getType(int column) {
          return mCursor.getType(column);
      }
  
      @Override
      public boolean isNull(int column) {
          return mCursor.isNull(column);
      }
  }
  