Example usage for com.mongodb.client MongoCursor MongoCursor

Introduction

In this page you can find the example usage for com.mongodb.client MongoCursor MongoCursor.

Prototype

MongoCursor

Source Link

Usage

From source file:com.ibm.research.mongotx.lrc.LRCSimpleTxDBCursor.java

License:Open Source License

@Override
public MongoCursor<Document> iterator() {

    return new MongoCursor<Document>() {
        boolean filled = false;
        int index = -1;

        private void fillIfNecessary() {
            if (filled)
                return;

            LRCSimpleTxDBCursor.this.fillIfNecessary();

            filled = true;//  w  ww.  java2 s.co  m
        }

        @Override
        public void close() {
        }

        @Override
        public boolean hasNext() {
            synchronized (tx) {
                fillIfNecessary();
                return index < (results.size() - 1);
            }
        }

        @Override
        public Document next() {
            synchronized (tx) {
                if (hasNext())
                    ++index;
                if (index >= results.size() || index < 0)
                    return null;
                return results.get(index);
            }
        }

        @Override
        public Document tryNext() {
            synchronized (tx) {
                if (hasNext())
                    return next();
                else
                    return null;
            }
        }

        @Override
        public ServerCursor getServerCursor() {
            throw new UnsupportedOperationException();
        }

        @Override
        public ServerAddress getServerAddress() {
            throw new UnsupportedOperationException();
        }
    };
}

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