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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.internal.wpf.*;
/**
* The class <code>TextTransfer</code> provides a platform specific mechanism
* for converting plain text represented as a java <code>String</code>
* to a platform specific representation of the data and vice versa.
*
* <p>An example of a java <code>String</code> containing plain text is shown
* below:</p>
*
* <code><pre>
* String textData = "Hello World";
* </code></pre>
*
* @see Transfer
*/
public class TextTransfer extends ByteArrayTransfer {
private static TextTransfer _instance = new TextTransfer();
private static int TYPEID = getTypeId();
/**
* Returns the singleton instance of the TextTransfer class.
*
* @return the singleton instance of the TextTransfer class
*/
public static TextTransfer getInstance () {
return _instance;
}
static int getTypeId() {
int format = OS.DataFormats_UnicodeText();
String name = createJavaString(format);
OS.GCHandle_Free(format);
return registerType(name);
}
private TextTransfer() {
}
boolean checkText(Object object) {
return object != null && object instanceof String && ((String)object).length() > 0;
}
protected int[] getTypeIds(){
return new int[]{TYPEID};
}
/**
* This implementation of <code>javaToNative</code> converts plain text
* represented by a java <code>String</code> to a platform specific representation.
*
* @param object a java <code>String</code> containing text
* @param transferData an empty <code>TransferData</code> object that will
* be filled in on return with the platform specific format of the data
*
* @see Transfer#nativeToJava
*/
public void javaToNative (Object object, TransferData transferData) {
if (!checkText(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
transferData.pValue = createDotNetString((String)object);
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of plain text to a java <code>String</code>.
*
* @param transferData the platform specific representation of the data to be converted
* @return a java <code>String</code> containing text if the conversion was successful; otherwise null
*
* @see Transfer#javaToNative
*/
public Object nativeToJava(TransferData transferData) {
if (!isSupportedType(transferData) || transferData.pValue == 0) return null;
return createJavaString(transferData.pValue);
}
}
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