/* 
 * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
 package org.csstudio.sds.ui.internal.properties;

import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.util.Assert;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;

/**
 * A table cell editor for values of type double[].
 *  
 * @author Kai Meyer
 */
public final class DoubleArrayCellEditor extends CellEditor {
	/**
	 * A shell.
	 */
	private Shell _shell;

	/**
	 * The current double[] value.
	 */
	private double[] _value;

	/**
	 * Creates a new double[] cell editor parented under the given control. The
	 * cell editor value is an double[] value.
	 * 
	 * @param parent
	 *            The parent table.
	 */
	public DoubleArrayCellEditor(final Composite parent) {
		super(parent, SWT.NONE);
		_shell = parent.getShell();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void activate() {
		String initValue = this.parseToString(_value);
		InputDialog dialog = new InputDialog(_shell,"Numbers","The numbers have to be seperated by a comma and a spare.\nExample: 0.5, 10.1, 2",initValue,null);
		if (dialog.open()==Window.OK) {
			_value = this.parseToDoubleArray(dialog.getValue());
		}
		if (_value != null) {
			fireApplyEditorValue();
		}
	}
	
	/**
	 * Parses the given double[] into a comma seperated String.
	 * @param array
	 * 				The double[]
	 * @return String
	 * 				The corresponding string
	 */
	private String parseToString(final double[] array) {
		StringBuffer buffer = new StringBuffer();
		if (array.length>0) {
			buffer.append(array[0]);
			for (int i=1;i<array.length;i++) {
				buffer.append(", ");
				buffer.append(array[i]);
			}
		}
		return buffer.toString();
	}
	
	/**
	 * Parses the given comma seperated String into double[].
	 * @param text	
	 * 				The String, which contains doubles seperated by comma
	 * @return double[]
	 * 				The corresponding double[]
	 */
	private double[] parseToDoubleArray(final String text) {
		String[] strings = text.split(", ");
		
		// String#split in Java returns a single-element array (instead of an
		// empty array) if the input was the empty string. But we must return
		// an empty array in that case!
		if (text.equals("")) {
			return new double[0];
		}
		
		double[] result = new double[strings.length]; 
		for (int i=0;i<strings.length;i++) {
			Double d = Double.valueOf(strings[i]);
			if (d.isNaN()) {
				result[i] = 0;
			} else {
				result[i] = d.doubleValue();
			}
		}
		return result;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Control createControl(final Composite parent) {
		return null;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Object doGetValue() {
		return _value;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doSetFocus() {
		// Ignore
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doSetValue(final Object value) {
		Assert.isTrue(value instanceof double[]);
		this._value = (double[]) value;
	}
	
}