SharedImageProvider.java revision 0ee91a2b74808fa3f51d370daaddf99f588d72ef 
1
2package com.android.gallery3d.filtershow.provider;
3
4import android.content.ContentProvider;
5import android.content.ContentValues;
6import android.database.Cursor;
7import android.database.MatrixCursor;
8import android.net.Uri;
9import android.os.ConditionVariable;
10import android.os.ParcelFileDescriptor;
11import android.provider.BaseColumns;
12import android.provider.MediaStore;
13import android.provider.OpenableColumns;
14import android.util.Log;
15
16import java.io.File;
17import java.io.FileNotFoundException;
18import java.util.Arrays;
19
20public class SharedImageProvider extends ContentProvider {
21
22    private static final String LOGTAG = "SharedImageProvider";
23
24    public static final String MIME_TYPE = "image/jpeg";
25    public static final String AUTHORITY = "com.android.gallery3d.filtershow.provider.SharedImageProvider";
26    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/image");
27    public static final String PREPARE = "prepare";
28
29    private final String[] mMimeStreamType = {
30            MIME_TYPE
31    };
32
33    private static ConditionVariable mImageReadyCond = new ConditionVariable(false);
34
35    @Override
36    public int delete(Uri arg0, String arg1, String[] arg2) {
37        return 0;
38    }
39
40    @Override
41    public String getType(Uri arg0) {
42        return MIME_TYPE;
43    }
44
45    @Override
46    public String[] getStreamTypes(Uri arg0, String mimeTypeFilter) {
47        return mMimeStreamType;
48    }
49
50    @Override
51    public Uri insert(Uri uri, ContentValues values) {
52        if (values.containsKey(PREPARE)) {
53            if (values.getAsBoolean(PREPARE)) {
54                mImageReadyCond.close();
55            } else {
56                mImageReadyCond.open();
57            }
58        }
59        return null;
60    }
61
62    @Override
63    public int update(Uri arg0, ContentValues arg1, String arg2, String[] arg3) {
64        return 0;
65    }
66
67    @Override
68    public boolean onCreate() {
69        return true;
70    }
71
72    @Override
73    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
74        String uriPath = uri.getLastPathSegment();
75        if (uriPath == null) {
76            return null;
77        }
78        if (projection == null) {
79            projection = new String[] {
80                    BaseColumns._ID,
81                    MediaStore.MediaColumns.DATA,
82                    OpenableColumns.DISPLAY_NAME,
83                    OpenableColumns.SIZE
84            };
85        }
86        // If we receive a query on display name or size,
87        // we should block until the image is ready
88        mImageReadyCond.block();
89
90        File path = new File(uriPath);
91
92        MatrixCursor cursor = new MatrixCursor(projection);
93        Object[] columns = new Object[projection.length];
94        for (int i = 0; i < projection.length; i++) {
95            if (projection[i].equalsIgnoreCase(BaseColumns._ID)) {
96                columns[i] = 0;
97            } else if (projection[i].equalsIgnoreCase(MediaStore.MediaColumns.DATA)) {
98                columns[i] = uri;
99            } else if (projection[i].equalsIgnoreCase(OpenableColumns.DISPLAY_NAME)) {
100                columns[i] = path.getName();
101            } else if (projection[i].equalsIgnoreCase(OpenableColumns.SIZE)) {
102                columns[i] = path.length();
103            }
104        }
105        cursor.addRow(columns);
106
107        return cursor;
108    }
109
110    public ParcelFileDescriptor openFile(Uri uri, String mode)
111            throws FileNotFoundException {
112        String uriPath = uri.getLastPathSegment();
113        if (uriPath == null) {
114            return null;
115        }
116        // Here we need to block until the image is ready
117        mImageReadyCond.block();
118        File path = new File(uriPath);
119        int imode = 0;
120        imode |= ParcelFileDescriptor.MODE_READ_ONLY;
121        return ParcelFileDescriptor.open(path, imode);
122    }
123}
124