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/*
* Copyright (C) 2012 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 com.android.contacts.common.database;
import android.database.AbstractCursor;
import android.database.CursorIndexOutOfBoundsException;
/**
* A cursor that is empty.
*
* <p>If you want an empty cursor, this class is better than a MatrixCursor because it has less
* overhead.
*/
public final class EmptyCursor extends AbstractCursor {
private String[] mColumns;
public EmptyCursor(String[] columns) {
this.mColumns = columns;
}
@Override
public int getCount() {
return 0;
}
@Override
public String[] getColumnNames() {
return mColumns;
}
@Override
public String getString(int column) {
throw cursorException();
}
@Override
public short getShort(int column) {
throw cursorException();
}
@Override
public int getInt(int column) {
throw cursorException();
}
@Override
public long getLong(int column) {
throw cursorException();
}
@Override
public float getFloat(int column) {
throw cursorException();
}
@Override
public double getDouble(int column) {
throw cursorException();
}
@Override
public boolean isNull(int column) {
throw cursorException();
}
private CursorIndexOutOfBoundsException cursorException() {
return new CursorIndexOutOfBoundsException("Operation not permitted on an empty cursor.");
}
}
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