Example usage for com.mongodb.gridfs GridFS GridFS

List of usage examples for com.mongodb.gridfs GridFS GridFS

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Introduction

In this page you can find the example usage for com.mongodb.gridfs GridFS GridFS.

Prototype

public GridFS(final DB db, final String bucket)

Source Link

Document

Creates a GridFS instance for the specified bucket in the given database.

Usage

From source file:de.fhg.igd.mongomvcc.impl.MongoDBVBranch.java

License:Open Source License

/**
 * Gets or creates a database collection that can handle large
 * objects (BLOBs) and uses a given access strategy.
 * @param name the collection's name/*from w  w  w. j  ava  2  s  .com*/
 * @param accessStrategy the strategy used to access large objects
 * @return the collection (never null)
 */
public VLargeCollection getLargeCollection(String name, AccessStrategy accessStrategy) {
    DB db = _db.getDB();
    return new MongoDBVLargeCollection(db.getCollection(name), new GridFS(db, name), this, _db.getCounter(),
            accessStrategy);
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

/**
 * Saves a file into the current database using the specified <tt>namespace</tt> and <tt>filename</tt>. All files sharing the same 
 * <tt>namespace</tt> and <tt>filename</tt> are considered versions of the same file. So, inserting a new file with an existing 
 * <tt>namespace</tt> and <tt>filename</tt> will create a new entry in the database. The method {@link #readFile(String, String)} will 
 * retrieve the latest version of the file and the method {@link #readFile(String, String)} will remove all the versions of the file. 
 * Other possible options could be to define a unique index in the <tt>files</tt> collection to avoid duplicates (versions) to be 
 * created: <code>createIndex("filename", namespace + ".files");</code>
 * @param namespace - (optional) name space under the file is saved. When nothing specified, the default bucket is used
 * @param filename - filename to be assigned to the file in the database
 * @param file - file to be saved to the database
 * @param metadata - optional file metadata
 * @return the id associated to the file in the collection
 *//*  w  ww  . j  av a2  s. c o m*/
public String saveFile(final @Nullable String namespace, final String filename, final File file,
        final @Nullable DBObject metadata) {
    checkArgument(isNotBlank(filename), "Uninitialized or invalid filename");
    checkArgument(file != null && file.canRead() && file.isFile(), "Uninitialized or invalid file");
    String objectId = null;
    final String namespace2 = trimToEmpty(namespace);
    final String filename2 = filename.trim();
    if (metadata != null) {
        metadata.removeField(IS_LATEST_VERSION_ATTR);
    }
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace2) ? new GridFS(db, namespace2) : new GridFS(db);
    // enforce isolation property: each namespace has its own bucket (encompassing 2 collections: files and chunks) and indexes in the database
    createSparseIndexWithUniqueConstraint(FILE_VERSION_PROP,
            gfsNs.getBucketName() + "." + GRIDFS_FILES_COLLECTION, false);
    // index open access links
    createNonUniqueIndex(FILE_OPEN_ACCESS_LINK_PROP, gfsNs.getBucketName() + "." + GRIDFS_FILES_COLLECTION,
            false);
    try {
        // insert new file/version in the database
        final GridFSInputFile gfsFile = gfsNs.createFile(file);
        gfsFile.setFilename(filename2);
        gfsFile.setContentType(mimeType(file));
        gfsFile.setMetaData(metadata);
        gfsFile.save();
        objectId = ObjectId.class.cast(gfsFile.getId()).toString();
        // unset the latest version in the database
        final GridFSDBFile latestVersion = getLatestVersion(gfsNs, filename2);
        if (latestVersion != null && latestVersion.getMetaData() != null) {
            latestVersion.getMetaData().removeField(IS_LATEST_VERSION_ATTR);
            latestVersion.save();
        }
    } catch (DuplicateKeyException dke) {
        throw new MongoDBDuplicateKeyException(dke.getMessage());
    } catch (IOException ioe) {
        throw new IllegalStateException("Failed to save file", ioe);
    } finally {
        // enforce versioning property by always restoring the latest version in the database
        restoreLatestVersion(gfsNs, filename2);
    }
    return objectId;
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

public void updateMetadata(final @Nullable String namespace, final String filename,
        final @Nullable DBObject metadata) {
    checkArgument(isNotBlank(filename), "Uninitialized or invalid filename");
    final String namespace2 = trimToEmpty(namespace);
    final String filename2 = filename.trim();
    final DBObject metadata2 = metadata != null ? metadata : new BasicDBObject();
    metadata2.put(IS_LATEST_VERSION_ATTR, filename2);
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace2) ? new GridFS(db, namespace2) : new GridFS(db);
    try {/*from w w w  . j av  a  2 s.c  om*/
        final GridFSDBFile latestUploadedVersion = getLatestUploadedFile(gfsNs, filename2);
        checkState(latestUploadedVersion != null, "File not found");
        latestUploadedVersion.setMetaData(metadata2);
        latestUploadedVersion.save();
    } catch (IllegalStateException ise) {
        throw ise;
    } catch (Exception e) {
        LOGGER.error("Failed to update latest metadata version in namespace=" + gfsNs.getBucketName()
                + ", filename=" + filename, e);
    }
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

public String createOpenAccessLink(final @Nullable String namespace, final String filename) {
    checkArgument(isNotBlank(filename), "Uninitialized or invalid filename");
    final String namespace2 = trimToEmpty(namespace);
    final String filename2 = filename.trim();
    final String secret = random(32, "abcdefghijklmnopqrstuvwxyz0123456789");
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace2) ? new GridFS(db, namespace2) : new GridFS(db);
    try {/*from   ww w .ja va2  s  . c o m*/
        final GridFSDBFile latestUploadedVersion = getLatestUploadedFile(gfsNs, filename2);
        checkState(latestUploadedVersion != null, "File not found");
        if (latestUploadedVersion.getMetaData() == null) {
            latestUploadedVersion.setMetaData(new BasicDBObject());
        }
        latestUploadedVersion.getMetaData().put(OPEN_ACCESS_LINK_ATTR, secret);
        latestUploadedVersion.getMetaData().put(OPEN_ACCESS_DATE_ATTR,
                JSON.parse(JSON_MAPPER.writeValueAsString(new Date())));
        latestUploadedVersion.save();
    } catch (IllegalStateException ise) {
        throw ise;
    } catch (Exception e) {
        LOGGER.error("Failed to create open access link in latest file version in namespace="
                + gfsNs.getBucketName() + ", filename=" + filename, e);
    }
    return secret;
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

public void removeOpenAccessLink(final @Nullable String namespace, final String filename) {
    checkArgument(isNotBlank(filename), "Uninitialized or invalid filename");
    final String namespace2 = trimToEmpty(namespace);
    final String filename2 = filename.trim();
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace2) ? new GridFS(db, namespace2) : new GridFS(db);
    final List<GridFSDBFile> files = gfsNs.find(new BasicDBObject("filename", filename2)
            .append(FILE_OPEN_ACCESS_LINK_PROP, new BasicDBObject("$exists", true)),
            new BasicDBObject("uploadDate", -1));
    for (final GridFSDBFile file : files) {
        if (file.getMetaData() != null) {
            file.getMetaData().removeField(OPEN_ACCESS_LINK_ATTR);
            file.getMetaData().removeField(OPEN_ACCESS_DATE_ATTR);
            file.save();//from w w  w. j a v a 2 s  .c o  m
        }
    }
    /* ideally we want to use a cursor here, but the save() operation fails
       final DBCursor cursor = gfsNs.getFileList(new BasicDBObject("filename", filename2).append(FILE_OPEN_ACCESS_LINK_PROP, 
       new BasicDBObject("$exists", true)));
       try {
    while (cursor.hasNext()) {
       final GridFSDBFile file = (GridFSDBFile) cursor.next();
       if (file.getMetaData() != null) {
          file.getMetaData().removeField(OPEN_ACCESS_LINK_ATTR);
          file.getMetaData().removeField(OPEN_ACCESS_DATE_ATTR); // this fails
          file.save();
       }
    }
       } finally {
    cursor.close();
       } */
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

/**
 * Reads a file object from the current database. The file is identified by the original filename stored in the database and the 
 * name space under the file was stored. When several versions exist of the same file, the latest version will be retrieved.
 * @param namespace - (optional) name space to be searched for in the database. When nothing specified, the default bucket is used
 * @param filename - filename to be searched for in the database
 * @param output - file where the output will be saved, this file must exists and must be writable
 *//*from w ww  .  ja  v  a2s .  c  om*/
public GridFSDBFile readFile(final @Nullable String namespace, final String filename) {
    checkArgument(isNotBlank(filename), "Uninitialized or invalid filename");
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace) ? new GridFS(db, namespace.trim()) : new GridFS(db);
    return getLatestVersion(gfsNs, filename);
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

public GridFSDBFileWrapper readOpenAccessFile(final String secret) {
    checkArgument(isNotBlank(secret), "Uninitialized or invalid secret");
    final String secret2 = secret.trim();
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    GridFSDBFileWrapper fileWrapper = null;
    final Set<String> collections = db.getCollectionNames();
    final Iterator<String> it = collections.iterator();
    while (it.hasNext() && fileWrapper == null) {
        final String collection = it.next();
        if (collection.endsWith("." + GRIDFS_FILES_COLLECTION)) {
            final String[] tokens = Splitter.on('.').omitEmptyStrings().trimResults().splitToList(collection)
                    .toArray(new String[2]);
            if (tokens.length >= 2) {
                final String namespace = tokens[tokens.length - 2];
                final GridFS gfsNs = new GridFS(db, namespace);
                final GridFSDBFile file = gfsNs.findOne(new BasicDBObject(FILE_OPEN_ACCESS_LINK_PROP, secret2));
                if (file != null) {
                    fileWrapper = new GridFSDBFileWrapper(namespace, file);
                }/*w ww.j  av a  2 s  .  co  m*/
            }
        }
    }
    return fileWrapper;
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

/**
 * Checks whether or not the specified file exists in the database, returning <tt>true</tt> only when the file exists in the 
 * specified namespace./*from   ww  w  .  j av  a 2 s  .c  o  m*/
 * @param namespace - (optional) name space to be searched for in the database. When nothing specified, the default bucket is used
 * @param filename - filename to be searched for in the database
 * @return
 */
public boolean fileExists(final @Nullable String namespace, final String filename) {
    checkArgument(isNotBlank(filename), "Uninitialized or invalid filename");
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace) ? new GridFS(db, namespace.trim()) : new GridFS(db);
    return gfsNs.findOne(filename.trim()) != null;
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

/**
 * Lists all the files in the specified name space. Only latest versions are included in the list.
 * @param namespace - (optional) name space to be searched for files. When nothing specified, the default bucket is used
 * @param sortCriteria - objects in the collection are sorted with this criteria
 * @param start - starting index/* w ww .  j  a  v a  2  s .c  o m*/
 * @param size - maximum number of objects returned
 * @param count - (optional) is updated with the number of objects in the database
 * @return a view of the files stored under the specified name space that contains the specified range.
 */
public List<GridFSDBFile> listFiles(final @Nullable String namespace, final DBObject sortCriteria,
        final int start, final int size, final @Nullable MutableLong count) {
    final List<GridFSDBFile> list = newArrayList();
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace) ? new GridFS(db, namespace.trim()) : new GridFS(db);
    final DBCursor cursor = gfsNs.getFileList(
            new BasicDBObject(FILE_VERSION_PROP, new BasicDBObject("$exists", true)), sortCriteria);
    cursor.skip(start).limit(size);
    try {
        while (cursor.hasNext()) {
            list.add((GridFSDBFile) cursor.next());
        }
    } finally {
        cursor.close();
    }
    if (count != null) {
        count.setValue(cursor.count());
    }
    return list;
}

From source file:eu.eubrazilcc.lvl.storage.mongodb.MongoDBConnector.java

License:EUPL

public List<GridFSDBFile> listFileOpenAccess(final @Nullable String namespace, final DBObject sortCriteria,
        final int start, final int size, final @Nullable MutableLong count) {
    final List<GridFSDBFile> list = newArrayList();
    final DB db = client().getDB(CONFIG_MANAGER.getDbName());
    final GridFS gfsNs = isNotBlank(namespace) ? new GridFS(db, namespace.trim()) : new GridFS(db);
    final DBCursor cursor = gfsNs
            .getFileList(new BasicDBObject(FILE_VERSION_PROP, new BasicDBObject("$exists", true))
                    .append(FILE_OPEN_ACCESS_LINK_PROP, new BasicDBObject("$exists", true)), sortCriteria);
    cursor.skip(start).limit(size);//  www  . ja v  a  2  s  . com
    try {
        while (cursor.hasNext()) {
            list.add((GridFSDBFile) cursor.next());
        }
    } finally {
        cursor.close();
    }
    if (count != null) {
        count.setValue(cursor.count());
    }
    return list;
}