package com.onaro.sanscreen.client.view.tabular;

import java.util.Collection;

import javax.swing.JLabel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;

import org.eclipse.core.runtime.IAdaptable;

import com.onaro.commons.util.SwingCollectionPrinter;
import com.onaro.util.jfc.tables.filter.StringFilter;

/**
 * Column that joins the values of a collection together into a String representation using a {@link SwingCollectionPrinter}.
 *
 * @param <E> element type of the collection
 * 
 * @see SwingCollectionPrinter
 */
public abstract class AdaptableJoinedCollectionColumn<E> extends AdaptableTabularColumn {
	
	private static final long serialVersionUID = 1L;
	
    private SwingCollectionPrinter<E> printer;
	
	public AdaptableJoinedCollectionColumn(String id, String name, SwingCollectionPrinter<E> printer) {
		super(id, String.class, name);
		setFilter(new StringFilter());
		setPrinter(printer);
	}
	
	public AdaptableJoinedCollectionColumn(String id, String name) {
	    this(id, name, new SwingCollectionPrinter<E>(SwingCollectionPrinter.COMMA_SEPARATED));
	}

	public AdaptableJoinedCollectionColumn(String id, SwingCollectionPrinter<E> printer) {
		this(id, null, printer);
	}
	
	public SwingCollectionPrinter<E> getPrinter() {
		return printer;
	}

	public void setPrinter(SwingCollectionPrinter<E> printer) {
		if (printer == null) {
			this.printer = new SwingCollectionPrinter<E>(SwingCollectionPrinter.COMMA_SEPARATED);
		} else {
			this.printer = printer;
		}
        
		// Align the cells according to the printer type (right align numbers).
		TableCellRenderer renderer = getCellRenderer();
		if (renderer == null) {
		    // Note DefaultTableCellRenderer is a JLabel.
		    renderer = new DefaultTableCellRenderer();
		    setCellRenderer (renderer);
		}
		if (renderer instanceof JLabel) {
		    ((JLabel)renderer).setHorizontalAlignment (this.printer.getAlignment());
		}
	}

	/**
	 * Retrieve the collection value to display for the specified row.
	 * 
	 * @param rowObj the row
	 * @return the collection to display in the column
	 */
	public abstract Collection<E> getCollectionValue(IAdaptable rowObj) throws Exception;

	@Override
	public String getValue(IAdaptable rowObj) throws Exception {
	    Collection<E> collection = getCollectionValue(rowObj);
		
		if (collection == null) return null;
		
		String joinedValue = getPrinter().toString(collection);
		
		return joinedValue;
	}

}