FutureCellRenderer.java

package me.corriekay.pokegoutil.utils.windows.renderer;

import java.awt.Component;
import java.util.concurrent.CompletableFuture;

import javax.swing.JTable;

import me.corriekay.pokegoutil.utils.windows.WindowStuffHelper;

/**
 * A cell renderer that displays percentages in the format "xx.xx%".
 */
public class FutureCellRenderer extends DefaultCellRenderer {

    @Override
    public Component getTableCellRendererComponent(final JTable table, final Object value, final boolean isSelected,
                                                   final boolean hasFocus, final int rowIndex, final int columnIndex) {
        setNativeLookAndFeel(table, value, isSelected);

        if (value != null) {
            @SuppressWarnings("unchecked")
            final CompletableFuture<String> future = (CompletableFuture<String>) value;

            if (future.isDone()) {
                final String resolvedValue = future.getNow("Failed.");
                setText(resolvedValue);
                setToolTipText(resolvedValue);
            } else {
                // We set a default text.
                setText("... Loading ...");

                future.thenAcceptAsync((String text) -> asyncSetValue(text, table, rowIndex, columnIndex));
            }
        }
        return this;
    }

    /**
     * Sets the text and tooltip when the value is resolved.
     *
     * @param textValue   The text to set.
     * @param table       The table.
     * @param rowIndex    The row index.
     * @param columnIndex The column index.
     */
    protected void asyncSetValue(final String textValue, final JTable table, final int rowIndex, final int columnIndex) {
        setText(textValue);
        setToolTipText(textValue);

        // We need the cell repainted
        WindowStuffHelper.fireCellChanged(table, rowIndex, columnIndex);
    }
}