/*******************************************************************************
 * Copyright (c) 2000, 2012 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.dnd;

/**
 * The <code>TransferData</code> class is a platform specific data structure for
 * describing the type and the contents of data being converted by a transfer agent.
 *
 * <p>As an application writer, you do not need to know the specifics of
 * TransferData.  TransferData instances are passed to a subclass of Transfer
 * and the Transfer object manages the platform specific issues.
 * You can ask a Transfer subclass if it can handle this data by calling
 * Transfer.isSupportedType(transferData).</p>
 *
 * <p>You should only need to become familiar with the fields in this class if you
 * are implementing a Transfer subclass and you are unable to subclass the
 * ByteArrayTransfer class.</p>
 *
 * @see <a href="https://eclipse.dev/eclipse/swt/">Sample code and further information</a>
 */
public class TransferData {
	/**
	 * The type is a unique identifier of a system format or user defined format.
	 * (Warning: This field is platform dependent)
	 * <p>
	 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
	 * public API. It is marked public only so that it can be shared
	 * within the packages provided by SWT. It is not available on all
	 * platforms and should never be accessed from application code.
	 * </p>
	 *
	 * @noreference This field is not intended to be referenced by clients.
	 */
	public long type;

	/**
	 * Specifies the number of units in pValue.
	 * (Warning: This field is platform dependent)
	 * <p>
	 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
	 * public API. It is marked public only so that it can be shared
	 * within the packages provided by SWT. It is not available on all
	 * platforms and should never be accessed from application code.
	 * </p>
	 *
	 * @see TransferData#format for the size of one unit
	 *
	 * @noreference This field is not intended to be referenced by clients.
	 */
	public int length;

	/**
	 * Specifies the size in bits of a single unit in pValue.
	 * (Warning: This field is platform dependent)
	 * <p>
	 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
	 * public API. It is marked public only so that it can be shared
	 * within the packages provided by SWT. It is not available on all
	 * platforms and should never be accessed from application code.
	 * </p>
	 *
	 * This is most commonly 8 bits, and on GTK4 is always 8 bits.
	 *
	 * @noreference This field is not intended to be referenced by clients.
	 */
	public int format;

	/**
	 * Pointer to the data being transferred.
	 * (Warning: This field is platform dependent)
	 * <p>
	 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
	 * public API. It is marked public only so that it can be shared
	 * within the packages provided by SWT. It is not available on all
	 * platforms and should never be accessed from application code.
	 * </p>
	 *
	 * @noreference This field is not intended to be referenced by clients.
	 */
	public long pValue;

	/**
	 * The result field contains the result of converting a
	 * java data type into a platform specific value.
	 * (Warning: This field is platform dependent)
	 * <p>
	 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
	 * public API. It is marked public only so that it can be shared
	 * within the packages provided by SWT. It is not available on all
	 * platforms and should never be accessed from application code.
	 * </p>
	 * <p>The value of result is 1 if the conversion was successful.
	 * The value of result is 0 if the conversion failed.</p>
	 *
	 * @noreference This field is not intended to be referenced by clients.
	 */
	public int result;
}
