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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.internal.Converter;
import org.eclipse.swt.internal.gtk.OS;
/**
* 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. See
* <code>Transfer</code> for additional information.
*
* <p>An example of a java <code>String</code> containing plain text is shown
* below:</p>
*
* <code><pre>
* String textData = "Hello World";
* </code></pre>
*/
public class TextTransfer extends ByteArrayTransfer {
private static TextTransfer _instance = new TextTransfer();
private static final String COMPOUND_TEXT = "COMPOUND_TEXT";
private static final String STRING = "STRING";
private static final int COMPOUND_TEXT_ID = registerType(COMPOUND_TEXT);
private static final int STRING_ID = registerType(STRING);
private TextTransfer() {}
/**
* Returns the singleton instance of the TextTransfer class.
*
* @return the singleton instance of the TextTransfer class
*/
public static TextTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts plain 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 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) {
transferData.result = 0;
if (object == null || !(object instanceof String) || !isSupportedType(transferData)) return;
String string = (String)object;
if (string.length() == 0) return;
byte[] buffer = Converter.wcsToMbcs (null, string, true);
if (transferData.type == COMPOUND_TEXT_ID) {
int /*long*/[] encoding = new int /*long*/[1];
int[] format = new int[1];
int /*long*/[] ctext = new int /*long*/[1];
int[] length = new int[1];
boolean result = OS.gdk_utf8_to_compound_text(buffer, encoding, format, ctext, length);
if (!result) return;
transferData.type = encoding[0];
transferData.format = format[0];
transferData.length = length[0];
transferData.pValue = ctext[0];
transferData.result = 1;
}
if (transferData.type == STRING_ID) {
int /*long*/ pValue = OS.g_malloc(buffer.length);
if (pValue == 0) return;
OS.memmove(pValue, buffer, buffer.length);
transferData.type = STRING_ID;
transferData.format = 8;
transferData.length = buffer.length;
transferData.pValue = pValue;
transferData.result = 1;
}
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of plain 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 text if the
* conversion was successful; otherwise null
*/
public Object nativeToJava(TransferData transferData){
if (!isSupportedType(transferData) || transferData.pValue == 0) return null;
byte[] buffer = null;
if (transferData.type == COMPOUND_TEXT_ID) {
int /*long*/[] list = new int /*long*/[1];
int count = OS.gdk_text_property_to_utf8_list(transferData.type, transferData.format, transferData.pValue, transferData.length, list);
if (count == 0) return null;
int /*long*/[] ptr = new int /*long*/[1];
OS.memmove(ptr, list[0], OS.PTR_SIZEOF);
int length = OS.strlen(ptr[0]);
buffer = new byte[length];
OS.memmove(buffer, ptr[0], length);
OS.g_strfreev(list[0]);
}
if (transferData.type == STRING_ID) {
int size = transferData.format * transferData.length / 8;
if (size == 0) return null;
buffer = new byte[size];
OS.memmove(buffer, transferData.pValue, size);
}
if (buffer == null) return null;
// convert byte array to a string
char [] unicode = Converter.mbcsToWcs (null, buffer);
String string = new String (unicode);
int end = string.indexOf('\0');
return (end == -1) ? string : string.substring(0, end);
}
protected int[] getTypeIds() {
return new int[] {COMPOUND_TEXT_ID, STRING_ID};
}
protected String[] getTypeNames() {
return new String[] {COMPOUND_TEXT, STRING};
}
}
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