RuleEditor.java

/*
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */
package eu.esdihumboldt.hale.ui.style.editors;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.geotools.styling.Rule;
import org.geotools.styling.StyleBuilder;
import org.geotools.styling.Symbolizer;
import org.opengis.filter.Filter;

import eu.esdihumboldt.hale.common.schema.model.TypeDefinition;
import eu.esdihumboldt.hale.ui.style.internal.Messages;

/**
 * Editor for {@link Rule}s
 * 
 * @param <T> the {@link Symbolizer} type
 * 
 * @author Simon Templer
 * @partner 01 / Fraunhofer Institute for Computer Graphics Research
 */
public class RuleEditor<T extends Symbolizer> implements Editor<Rule> {

	private final StyleBuilder styleBuilder = new StyleBuilder();

	private final Composite page;

	private final Editor<Filter> filterEditor;

	private final Editor<? extends Symbolizer> symbolizerEditor;

	/**
	 * Creates a {@link Rule} editor
	 * 
	 * @param parent the parent composite
	 * @param typeDefinition the type Definition
	 * @param filter the initial {@link Filter}
	 * @param symbolizerType the {@link Symbolizer} type
	 * @param symbolizer the initial {@link Symbolizer}
	 * @param symbolizerFactory a {@link Symbolizer} editor factory
	 */
	public RuleEditor(Composite parent, TypeDefinition typeDefinition, Filter filter,
			Class<T> symbolizerType, T symbolizer, EditorFactory<T> symbolizerFactory) {
		super();

		page = new Composite(parent, SWT.NONE);
		page.setLayout(new GridLayout(1, false));

		// filter
		Label filterLabel = new Label(page, SWT.NONE);
		filterLabel.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false));
		filterLabel.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT));
		filterLabel.setText(Messages.RuleEditor_FilterLabel);

		filterEditor = new FilterEditor(page, typeDefinition, filter);
		filterEditor.getControl().setLayoutData(new GridData(SWT.BEGINNING, SWT.FILL, true, false));

		// symbolizer
		Label symbolLabel = new Label(page, SWT.NONE);
		symbolLabel.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false));
		symbolLabel.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT));
		symbolLabel.setText(symbolizerType.getSimpleName());

		symbolizerEditor = symbolizerFactory.createEditor(page, symbolizer);
		symbolizerEditor.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	}

	/**
	 * @see Editor#getControl()
	 */
	@Override
	public Control getControl() {
		return page;
	}

	/**
	 * @see Editor#getValue()
	 */
	@Override
	public Rule getValue() throws Exception {
		Rule rule = styleBuilder.createRule(symbolizerEditor.getValue());
		rule.setFilter(filterEditor.getValue());

		return rule;
	}

	/**
	 * @see Editor#isChanged()
	 */
	@Override
	public boolean isChanged() {
		return filterEditor.isChanged() || symbolizerEditor.isChanged();
	}

	/**
	 * @see Editor#setValue(java.lang.Object)
	 */
	@Override
	public void setValue(Rule value) {
		throw new UnsupportedOperationException(
				"Setting the value on the rule editor not allowed, use the constructor instead."); //$NON-NLS-1$
	}

}