path: root/dozentenmodul/src/main/java/org/openslx/dozmod/gui/control/table/CheckListTable.java

package org.openslx.dozmod.gui.control.table;

import java.awt.Component;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Set;

import javax.swing.Box;

import org.apache.log4j.Logger;

public abstract class CheckListTable<T> extends ListTable<CheckListTable.Wrapper<T>> {

	private static final long serialVersionUID = 5667297891670398732L;
	
	private static final Logger LOGGER = Logger.getLogger(CheckListTable.class);
	
	public static final ListTableColumn COL_CHECKBOX = new ListTableColumn("", Boolean.class, null, true);
	
	private static final Component LBL_EMPTY_CELL = Box.createHorizontalGlue();

	public CheckListTable(ListTableColumn... columns) {
		this(null, columns);
	}

	public CheckListTable(final Comparator<T> itemComparator, ListTableColumn... columns) {
		super(itemComparator == null ? null : new Comparator<Wrapper<T>>() {
			@Override
			public int compare(Wrapper<T> o1, Wrapper<T> o2) {
				if (o1 == null && o2 == null)
					return 0;
				if (o1 == null)
					return -1;
				if (o2 == null)
					return 1;
				return itemComparator.compare(o1.item, o2.item);
			}

		}, copyColumns(columns));
	}

	private static ListTableColumn[] copyColumns(ListTableColumn[] columns) {
		final ListTableColumn ncolumns[] = new ListTableColumn[columns.length + 1];
		ncolumns[0] = COL_CHECKBOX;
		System.arraycopy(columns, 0, ncolumns, 1, columns.length);
		return ncolumns;
	}
	
	@Override
	public void setValueAt(Object newValue, Wrapper<T> row, ListTableColumn column) {
		if (column == COL_CHECKBOX && newValue != null && newValue.getClass() == Boolean.class) {
			row.isChecked = (Boolean)newValue;
		}
	}
	
	@Override
	protected final Object getValueAtInternal(Wrapper<T> row, ListTableColumn columnIndex) {
		if (row.item == null)
			return null;
		if (columnIndex == COL_CHECKBOX) {
			return row.isChecked;
		}
		return getValueAtInternal2(row.item, columnIndex);
	}
	
	protected abstract Object getValueAtInternal2(T row, ListTableColumn columnIndex);
	
	@Override
	public final Component prepareRenderHook(Component component, Wrapper<T> row,
			ListTableColumn listTableColumn, boolean isSelected) {
		if (listTableColumn == COL_CHECKBOX) {
			if (row == null || row.item == null || !isItemCheckable(row.item)) {
				return LBL_EMPTY_CELL;
			}
		} else if (row.item != null) {
			component = prepareRenderHook2(component, row.item, listTableColumn, isSelected);
		}
		return component;
	}
	
	public Component prepareRenderHook2(Component component, T row,
			ListTableColumn listTableColumn, boolean isSelected) {
		// Nothing
		return component;
	}
	
	public void setData(List<T> data, Set<T> preChecked, boolean sort) {
		List<Wrapper<T>> list = new ArrayList<>(data.size());
		for (T item : data) {
			list.add(new Wrapper<T>(item, preChecked != null && preChecked.contains(item)));
		}
		super.setData(list, sort);
	}
	
	protected abstract boolean isItemCheckable(T item);
	
	public T getSelectedItem2() {
		Wrapper<T> ret = getSelectedItem();
		if (ret == null)
			return null;
		return ret.item;
	}

	public static class Wrapper<S> {
	
		protected boolean isChecked;
		public final S item;
	
		public Wrapper(S item, boolean checked) {
			this.item = item;
			this.isChecked = checked;
		}
	
		@Override
		public boolean equals(Object obj) {
			if (obj == null)
				return false;
			if (obj instanceof Wrapper<?>)
				return item.equals(((Wrapper<?>)obj).item);
			return false;
		}
	
		@Override
		public int hashCode() {
			return item.hashCode();
		}
		
		@Override
		public String toString() {
			return "(" + item.hashCode() + "=" + isChecked + ")";
		}
		
		public boolean isChecked() {
			return isChecked;
		}
	
	}
	
}