android_webview/test/shell/src/org/chromium/android_webview/test/TestContentProvider.java

// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * Content provider for testing content URLs.
 */

package org.chromium.android_webview.test;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.database.AbstractCursor;
import android.database.Cursor;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.util.Log;

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

// Note: if you move this class, make sure you have also updated AndroidManifest.xml
public class TestContentProvider extends ContentProvider {
    private static final String AUTHORITY =
            "org.chromium.android_webview.test.TestContentProvider";
    private static final String CONTENT_SCHEME = "content://";
    private static final String CONTENT_TYPE = "image/png";
    private static final String GET_RESOURCE_REQUEST_COUNT = "get_resource_request_count";
    private static final String RESET_RESOURCE_REQUEST_COUNT = "reset_resource_request_count";
    private static final String TAG = "TestContentProvider";
    private enum ColumnIndex {
        RESOURCE_REQUEST_COUNT_COLUMN,
    };
    private final Map<String, Integer> mResourceRequestCount;

    public static String createContentUrl(String target) {
        return CONTENT_SCHEME + AUTHORITY + "/" + target;
    }

    private static Uri createRequestUri(final String target, String resource) {
        return Uri.parse(createContentUrl(target) + "?" + resource);
    }

    public static int getResourceRequestCount(Context context, String resource) {
        Uri uri = createRequestUri(GET_RESOURCE_REQUEST_COUNT, resource);
        final Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
        try {
            cursor.moveToFirst();
            return cursor.getInt(ColumnIndex.RESOURCE_REQUEST_COUNT_COLUMN.ordinal());
        } finally {
            cursor.close();
        }
    }

    public static void resetResourceRequestCount(Context context, String resource) {
        Uri uri = createRequestUri(RESET_RESOURCE_REQUEST_COUNT, resource);
        // A null cursor is returned for this request.
        context.getContentResolver().query(uri, null, null, null, null);
    }

    public TestContentProvider() {
        super();
        mResourceRequestCount = new HashMap<String, Integer>();
    }

    @Override
    public boolean onCreate() {
        return true;
    }

    @Override
    public AssetFileDescriptor openAssetFile(Uri uri, String mode) {
        String resource = uri.getLastPathSegment();
        if (mResourceRequestCount.containsKey(resource)) {
            mResourceRequestCount.put(resource, mResourceRequestCount.get(resource) + 1);
        } else {
            mResourceRequestCount.put(resource, 1);
        }
        return createImage();
    }

    @Override
    public String getType(Uri uri) {
        return CONTENT_TYPE;
    }

    @Override
    public int update(Uri uri, ContentValues values, String where,
                      String[] whereArgs) {
        return 0;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }

    /**
     * Cursor object for retrieving resource request counters.
     */
    private static class ProviderStateCursor extends AbstractCursor {
        private final int mResourceRequestCount;

        public ProviderStateCursor(int resourceRequestCount) {
            mResourceRequestCount = resourceRequestCount;
        }

        @Override
        public boolean isNull(int columnIndex) {
            return columnIndex != ColumnIndex.RESOURCE_REQUEST_COUNT_COLUMN.ordinal();
        }

        @Override
        public int getCount() {
            return 1;
        }

        @Override
        public int getType(int columnIndex) {
            if (columnIndex == ColumnIndex.RESOURCE_REQUEST_COUNT_COLUMN.ordinal()) {
                return Cursor.FIELD_TYPE_INTEGER;
            }
            return Cursor.FIELD_TYPE_NULL;
        }

        private void unsupported() {
            throw new UnsupportedOperationException();
        }

        @Override
        public double getDouble(int columnIndex) {
            unsupported();
            return 0.0;
        }

        @Override
        public float getFloat(int columnIndex) {
            unsupported();
            return 0.0f;
        }

        @Override
        public int getInt(int columnIndex) {
            if (columnIndex == ColumnIndex.RESOURCE_REQUEST_COUNT_COLUMN.ordinal()) {
                return mResourceRequestCount;
            }
            return -1;
        }

        @Override
        public short getShort(int columnIndex) {
            unsupported();
            return 0;
        }

        @Override
        public long getLong(int columnIndex) {
            return getInt(columnIndex);
        }

        @Override
        public String getString(int columnIndex) {
            unsupported();
            return null;
        }

        @Override
        public String[] getColumnNames() {
            return new String[] { GET_RESOURCE_REQUEST_COUNT };
        }
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
                        String[] selectionArgs, String sortOrder) {
        String action = uri.getLastPathSegment();
        String resource = uri.getQuery();
        if (GET_RESOURCE_REQUEST_COUNT.equals(action)) {
            return new ProviderStateCursor(
                mResourceRequestCount.containsKey(resource) ?
                mResourceRequestCount.get(resource) : 0);
        } else if (RESET_RESOURCE_REQUEST_COUNT.equals(action)) {
            mResourceRequestCount.put(resource, 0);
        }
        return null;
    }

    // 1x1 black dot png image.
    private static final byte[] IMAGE = {
        (byte) 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00,
        0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
        0x01, 0x08, 0x00, 0x00, 0x00, 0x00, 0x3a, 0x7e, (byte) 0x9b, 0x55, 0x00,
        0x00, 0x00, 0x01, 0x73, 0x52, 0x47, 0x42, 0x00, (byte) 0xae, (byte) 0xce,
        0x1c, (byte) 0xe9, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x44, 0x41, 0x54, 0x08,
        0x1d, 0x01, 0x02, 0x00, (byte) 0xfd, (byte) 0xff, 0x00, 0x00, 0x00, 0x02,
        0x00, 0x01, (byte) 0xcd, (byte) 0xe3, (byte) 0xd1, 0x2b, 0x00, 0x00, 0x00,
        0x00, 0x49, 0x45, 0x4e, 0x44, (byte) 0xae, 0x42, 0x60, (byte) 0x82
    };

    private static AssetFileDescriptor createImage() {
        ParcelFileDescriptor[] pfds = null;
        FileOutputStream fileOut = null;
        try {
            try {
                pfds = ParcelFileDescriptor.createPipe();
                fileOut = new FileOutputStream(pfds[1].getFileDescriptor());
                fileOut.write(IMAGE);
                fileOut.flush();
                return new AssetFileDescriptor(pfds[0], 0, -1);
            } finally {
                if (fileOut != null) fileOut.close();
                if (pfds != null && pfds[1] != null) pfds[1].close();
            }
        } catch (IOException e) {
            Log.e(TAG, e.getMessage(), e);
        }
        return null;
    }
}