Example usage for com.vaadin.shared Range withLength

Introduction

In this page you can find the example usage for com.vaadin.shared Range withLength.

Prototype

public static Range withLength(final int start, final int length) throws IllegalArgumentException 

Source Link

Document

Creates a range from a start point, with a given length.

Usage

From source file:org.vaadin.viritin.grid.SizelessDataCommunicator.java

License:Apache License

@Override
protected void sendDataToClient(boolean initial) {
    if (getDataProvider() == null) {
        return;//from w  w  w.j  a va2  s.c o m
    }

    if (initial || reset) {
        rpc.reset(0);
    }

    Range requestedRows = getPushRows();
    if (!requestedRows.isEmpty()) {
        int offset = requestedRows.getStart();
        // Always fetch some extra rows.
        int limit = requestedRows.length() + getMinPushSize();
        List<T> rowsToPush = fetchItemsWithRange(offset, limit);
        int lastIndex = offset + rowsToPush.size();
        if (lastIndex > knownSize) {
            int rowsToAdd = lastIndex - knownSize;
            rpc.insertRows(knownSize, rowsToAdd + (rowsToPush.size() == limit ? 1 : 0));
            knownSize = lastIndex;
        } else if (rowsToPush.size() < requestedRows.length()) {
            // Size decreased
            int rowsToRemove = Math.max(requestedRows.length() - rowsToPush.size(), knownSize - lastIndex);
            knownSize = lastIndex;
            rpc.removeRows(knownSize, rowsToRemove);
        }
        pushData(offset, rowsToPush);
    }

    if (!getUpdatedData().isEmpty()) {
        JsonArray dataArray = Json.createArray();
        int i = 0;
        for (T data : getUpdatedData()) {
            dataArray.set(i++, getDataObject(data));
        }
        rpc.updateData(dataArray);
    }

    setPushRows(Range.withLength(0, 0));
    getUpdatedData().clear();
}

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