Example usage for com.vaadin.shared Range length

Introduction

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

Prototype

public int length() 

Source Link

Document

The number of integers contained in the range.

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  av a  2  s .  co  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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