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/*******************************************************************************
* Copyright (c) 2000, 2005 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;
import org.eclipse.swt.internal.carbon.CFRange;
/**
* The class <code>RTFTransfer</code> provides a platform specific mechanism
* for converting text in RTF 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 RTF text is shown
* below:</p>
*
* <code><pre>
* String rtfData = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i Hello World}";
* </code></pre>
*
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*/
public class RTFTransfer extends ByteArrayTransfer {
static RTFTransfer _instance = new RTFTransfer();
static final String RTF = "RTF "; //$NON-NLS-1$
static final int RTFID = registerType(RTF);
RTFTransfer() {}
/**
* Returns the singleton instance of the RTFTransfer class.
*
* @return the singleton instance of the RTFTransfer class
*/
public static RTFTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts RTF-formatted 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 RTF 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 (!checkRTF(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
transferData.result = -1;
String string = (String)object;
int count = string.length();
char[] chars = new char[count];
string.getChars(0, count, chars, 0);
int cfstring = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, count);
if (cfstring == 0) return;
try {
CFRange range = new CFRange();
range.length = chars.length;
int encoding = OS.CFStringGetSystemEncoding();
int[] size = new int[1];
int numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', true, null, 0, size);
if (numChars == 0 || size[0] == 0) return;
byte[] buffer = new byte[size[0]];
numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', true, buffer, size [0], size);
if (numChars == 0) return;
transferData.data = new byte[1][];
transferData.data[0] = buffer;
transferData.result = 0;
} finally {
OS.CFRelease(cfstring);
}
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of RTF 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 RTF 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];
int encoding = OS.CFStringGetSystemEncoding();
int cfstring = OS.CFStringCreateWithBytes(OS.kCFAllocatorDefault, buffer, buffer.length, encoding, true);
if (cfstring == 0) return null;
try {
int length = OS.CFStringGetLength(cfstring);
if (length == 0) return null;
char[] chars = new char[length];
CFRange range = new CFRange();
range.length = length;
OS.CFStringGetCharacters(cfstring, range, chars);
return new String(chars);
} finally {
OS.CFRelease(cfstring);
}
}
protected int[] getTypeIds() {
return new int[] {RTFID};
}
protected String[] getTypeNames() {
return new String[] {RTF};
}
boolean checkRTF(Object object) {
return (object != null && object instanceof String && ((String)object).length() > 0);
}
protected boolean validate(Object object) {
return checkRTF(object);
}
}
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