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/*******************************************************************************
* Copyright (c) 2000, 2004 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.carbon.OS;
/**
* The class <code>HTMLTransfer</code> provides a platform specific mechanism
* for converting text in HTML format represented as a java <code>String</code>
* to a platform specific representation of the data and vice versa. See
* <code>Transfer</code> for additional information.
*
* <p>An example of a java <code>String</code> containing HTML text is shown
* below:</p>
*
* <code><pre>
* String htmlData = "<b>Hello World</b>";
* </code></pre>
*/
public class HTMLTransfer extends ByteArrayTransfer {
private static HTMLTransfer _instance = new HTMLTransfer();
private static final String HTML = "HTML"; //$NON-NLS-1$
private static final int HTMLID = registerType(HTML);
private HTMLTransfer() {}
/**
* Returns the singleton instance of the HTMLTransfer class.
*
* @return the singleton instance of the HTMLTransfer class
*/
public static HTMLTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts HTML text
* represented by a java <code>String</code> to a platform specific representation.
* For additional information see <code>Transfer#javaToNative</code>.
*
* @param object a java <code>String</code> containing HTML text
* @param transferData an empty <code>TransferData</code> object; this
* object will be filled in on return with the platform specific format of the data
*/
public void javaToNative (Object object, TransferData transferData){
if (!checkHTML(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
String string = (String)object;
int count = string.length();
char[] chars = new char[count];
string.getChars(0, count, chars, 0);
byte[] buffer = new byte[chars.length * 2];
OS.memcpy(buffer, chars, buffer.length);
transferData.data = new byte[1][];
transferData.data[0] = buffer;
transferData.result = OS.noErr;
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of HTML text to a java <code>String</code>.
* For additional information see <code>Transfer#nativeToJava</code>.
*
* @param transferData the platform specific representation of the data to be
* been converted
* @return a java <code>String</code> containing HTML text if the
* conversion was successful; otherwise null
*/
public Object nativeToJava(TransferData transferData){
if (!isSupportedType(transferData) || transferData.data == null) return null;
if (transferData.data.length == 0 || transferData.data[0].length == 0) return null;
byte[] buffer = transferData.data[0];
char[] chars = new char[(buffer.length + 1) / 2];
OS.memcpy(chars, buffer, buffer.length);
return new String(chars);
}
protected int[] getTypeIds() {
return new int[] {HTMLID};
}
protected String[] getTypeNames() {
return new String[] {HTML};
}
boolean checkHTML(Object object) {
return (object != null && object instanceof String && ((String)object).length() > 0);
}
protected boolean validate(Object object) {
return checkHTML(object);
}
}
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