delete unused FilterCursorWrapper class

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FilterCursorWrapper.java

@@ -1,93 +0,0 @@
-/*
- * Copyright (C) 2017 Schürmann & Breitmoser GbR
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.sufficientlysecure.keychain.util;
-
-
-import android.database.Cursor;
-import android.database.CursorWrapper;
-
-public abstract class FilterCursorWrapper extends CursorWrapper {
-    private int[] mIndex;
-    private int mCount = 0;
-    private int mPos = 0;
-
-    public abstract boolean isVisible(Cursor cursor);
-
-    public FilterCursorWrapper(Cursor cursor) {
-        super(cursor);
-        mCount = super.getCount();
-        mIndex = new int[mCount];
-        for (int i = 0; i < mCount; i++) {
-            super.moveToPosition(i);
-            if (isVisible(cursor)) {
-                mIndex[mPos++] = i;
-            }
-        }
-        mCount = mPos;
-        mPos = 0;
-        super.moveToFirst();
-    }
-
-    @Override
-    public boolean move(int offset) {
-        return this.moveToPosition(mPos + offset);
-    }
-
-    @Override
-    public boolean moveToNext() {
-        return this.moveToPosition(mPos + 1);
-    }
-
-    @Override
-    public boolean moveToPrevious() {
-        return this.moveToPosition(mPos - 1);
-    }
-
-    @Override
-    public boolean moveToFirst() {
-        return this.moveToPosition(0);
-    }
-
-    @Override
-    public boolean moveToLast() {
-        return this.moveToPosition(mCount - 1);
-    }
-
-    @Override
-    public boolean moveToPosition(int position) {
-        if (position >= mCount || position < 0) {
-            return false;
-        }
-        return super.moveToPosition(mIndex[position]);
-    }
-
-    @Override
-    public int getCount() {
-        return mCount;
-    }
-
-    public int getHiddenCount() {
-        return super.getCount() - mCount;
-    }
-
-    @Override
-    public int getPosition() {
-        return mPos;
-    }
-
-}