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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.gtk.*;
/**
* 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.
*
* <p>An example of a java <code>String</code> containing HTML text is shown
* below:</p>
*
* <code><pre>
* String htmlData = "<p>This is a paragraph of text.</p>";
* </code></pre>
*
* @see Transfer
*/
public class HTMLTransfer extends ByteArrayTransfer {
private static HTMLTransfer _instance = new HTMLTransfer();
private static final String TEXT_HTML = "text/html"; //$NON-NLS-1$
private static final int TEXT_HTML_ID = registerType(TEXT_HTML);
private static final String TEXT_HTML2 = "TEXT/HTML"; //$NON-NLS-1$
private static final int TEXT_HTML2_ID = registerType(TEXT_HTML2);
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-formatted text
* represented by a java <code>String</code> to a platform specific representation.
*
* @param object a java <code>String</code> containing HTML 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){
transferData.result = 0;
if (!checkHTML(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
String string = (String)object;
int charCount = string.length();
char [] chars = new char[charCount +1];
string.getChars(0, charCount , chars, 0);
int byteCount = chars.length*2;
int /*long*/ pValue = OS.g_malloc(byteCount);
if (pValue == 0) return;
OS.memmove(pValue, chars, byteCount);
transferData.length = byteCount;
transferData.format = 8;
transferData.pValue = pValue;
transferData.result = 1;
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of HTML 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 HTML text if the conversion was successful;
* otherwise null
*
* @see Transfer#javaToNative
*/
public Object nativeToJava(TransferData transferData){
if ( !isSupportedType(transferData) || transferData.pValue == 0 ) return null;
/* Ensure byteCount is a multiple of 2 bytes */
int size = (transferData.format * transferData.length / 8) / 2 * 2;
if (size <= 0) return null;
char[] chars = new char [size/2];
OS.memmove (chars, transferData.pValue, size);
String string = new String (chars);
int end = string.indexOf('\0');
return (end == -1) ? string : string.substring(0, end);
}
protected int[] getTypeIds() {
return new int[] {TEXT_HTML_ID, TEXT_HTML2_ID};
}
protected String[] getTypeNames() {
return new String[] {TEXT_HTML, TEXT_HTML2};
}
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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