1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.android.mail.utils;
17
18import android.database.MatrixCursor;
19
20import java.util.HashMap;
21import java.util.Map;
22
23public class MatrixCursorWithCachedColumns extends MatrixCursor {
24    /** A mapping of column names to column indices, to speed up lookups */
25    private final Map<String, Integer> mColumnNameMap;
26
27    public MatrixCursorWithCachedColumns(final String[] columnNames, final int initialCapacity) {
28        super(columnNames, initialCapacity);
29
30        final int columnCount = columnNames.length;
31        mColumnNameMap = new HashMap<String, Integer>(columnCount, 1);
32        for (int i = 0; i < columnCount; i++) {
33            mColumnNameMap.put(columnNames[i], i);
34        }
35    }
36
37    public MatrixCursorWithCachedColumns(final String[] columnNames) {
38        this(columnNames, 16);
39    }
40
41    @Override
42    public int getColumnIndex(String columnName) {
43        final Integer i = mColumnNameMap.get(columnName);
44        if (i != null) {
45            return i.intValue();
46        }
47
48        return -1;
49    }
50}
51