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/*******************************************************************************
* Copyright (c) 2007 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.motif.*;
/**
* The class <code>URLTransfer</code> provides a platform specific mechanism
* for converting text in URL 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. The string in the
* is mandatory and must contain the fully specified url.
*
* <p>An example of a java <code>String</code> containing a URL is shown
* below:</p>
*
* <code><pre>
* String urlData = "http://www.eclipse.org";
* </code></pre>
*/
public class URLTransfer extends ByteArrayTransfer {
static URLTransfer _instance = new URLTransfer();
static final String TEXT_UNICODE = "text/unicode"; //$NON-NLS-1$
private static final String TEXT_XMOZURL = "text/x-moz-url"; //$NON-NLS-1$
static final int TEXT_UNICODE_ID = registerType(TEXT_UNICODE);
private static final int TEXT_XMOZURL_ID = registerType(TEXT_XMOZURL);
private URLTransfer() {}
/**
* Returns the singleton instance of the URLTransfer class.
*
* @return the singleton instance of the URLTransfer class
*/
public static URLTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts a URL
* 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 a URL
* @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){
transferData.result = 0;
if (!checkURL(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 pValue = OS.XtMalloc(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 a URL 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
* converted
* @return a java <code>String</code> containing a URL if the
* conversion was successful; otherwise null
*/
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_XMOZURL_ID, TEXT_UNICODE_ID};
}
protected String[] getTypeNames(){
return new String[] {TEXT_XMOZURL, TEXT_UNICODE};
}
boolean checkURL(Object object) {
return object != null && (object instanceof String) && ((String)object).length() > 0;
}
protected boolean validate(Object object) {
return checkURL(object);
}
}
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