src/com/android/browser/homepages/HomeProvider.java

/*
 * Copyright (C) 2011 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.browser.homepages;

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

import com.android.browser.BrowserSettings;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;

public class HomeProvider extends ContentProvider {

    private static final String TAG = "HomeProvider";
    public static final String AUTHORITY = "com.android.browser.home";
    public static final String MOST_VISITED = "content://" + AUTHORITY + "/";

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

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

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

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

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {
        return null;
    }

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

    @Override
    public ParcelFileDescriptor openFile(Uri uri, String mode) {
        try {
            ParcelFileDescriptor[] pipes = ParcelFileDescriptor.createPipe();
            final ParcelFileDescriptor write = pipes[1];
            AssetFileDescriptor afd = new AssetFileDescriptor(write, 0, -1);
            new RequestHandler(getContext(), uri, afd.createOutputStream()).start();
            return pipes[0];
        } catch (IOException e) {
            Log.e(TAG, "Failed to handle request: " + uri, e);
            return null;
        }
    }

    public static WebResourceResponse shouldInterceptRequest(Context context,
            String url) {
        try {
            boolean useMostVisited = BrowserSettings.getInstance().useMostVisitedHomepage();
            if (useMostVisited && url.startsWith("content://")) {
                Uri uri = Uri.parse(url);
                if (AUTHORITY.equals(uri.getAuthority())) {
                    InputStream ins = context.getContentResolver()
                            .openInputStream(uri);
                    return new WebResourceResponse("text/html", "utf-8", ins);
                }
            }
            boolean listFiles = BrowserSettings.getInstance().isDebugEnabled();
            if (listFiles && interceptFile(url)) {
                PipedInputStream ins = new PipedInputStream();
                PipedOutputStream outs = new PipedOutputStream(ins);
                new RequestHandler(context, Uri.parse(url), outs).start();
                return new WebResourceResponse("text/html", "utf-8", ins);
            }
        } catch (Exception e) {}
        return null;
    }

    private static boolean interceptFile(String url) {
        if (!url.startsWith("file:///")) {
            return false;
        }
        String fpath = url.substring(7);
        File f = new File(fpath);
        if (!f.isDirectory()) {
            return false;
        }
        return true;
    }

}