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/*******************************************************************************
* Copyright (c) 2000, 2012 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.*;
import org.eclipse.swt.internal.gtk.*;
/**
* 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.
*
* <p>An example of a java <code>String</code> containing plain text is shown
* below:</p>
*
* <code><pre>
* String textData = "Hello World";
* </code></pre>
*
* <p>Note the <code>TextTransfer</code> does not change the content of the text
* data. For a better integration with the platform, the application should convert
* the line delimiters used in the text data to the standard line delimiter used by the
* platform.
* </p>
*
* @see Transfer
*/
public class TextTransfer extends ByteArrayTransfer {
private static TextTransfer _instance = new TextTransfer();
private static final String COMPOUND_TEXT = "COMPOUND_TEXT"; //$NON-NLS-1$
private static final String UTF8_STRING = "UTF8_STRING"; //$NON-NLS-1$
private static final String STRING = "STRING"; //$NON-NLS-1$
private static final int COMPOUND_TEXT_ID = registerType(COMPOUND_TEXT);
private static final int UTF8_STRING_ID = registerType(UTF8_STRING);
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.
*
* @param object a java <code>String</code> containing 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
*/
@Override
public void javaToNative (Object object, TransferData transferData) {
transferData.result = 0;
if (!checkText(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
String string = (String)object;
byte[] utf8 = Converter.wcsToMbcs (string, true);
if (transferData.type == COMPOUND_TEXT_ID) {
long /*int*/[] encoding = new long /*int*/[1];
int[] format = new int[1];
long /*int*/[] ctext = new long /*int*/[1];
int[] length = new int[1];
boolean result = OS.gdk_x11_display_utf8_to_compound_text (OS.gdk_display_get_default(), utf8, 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 == UTF8_STRING_ID) {
long /*int*/ pValue = OS.g_malloc(utf8.length);
if (pValue == 0) return;
OS.memmove(pValue, utf8, utf8.length);
transferData.type = UTF8_STRING_ID;
transferData.format = 8;
transferData.length = utf8.length - 1;
transferData.pValue = pValue;
transferData.result = 1;
}
if (transferData.type == STRING_ID) {
long /*int*/ string_target = OS.gdk_utf8_to_string_target(utf8);
if (string_target == 0) return;
transferData.type = STRING_ID;
transferData.format = 8;
transferData.length = OS.strlen(string_target);
transferData.pValue = string_target;
transferData.result = 1;
}
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of plain 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 text if the conversion was successful; otherwise null
*
* @see Transfer#javaToNative
*/
@Override
public Object nativeToJava(TransferData transferData){
if (!isSupportedType(transferData) || transferData.pValue == 0) return null;
long /*int*/[] list = new long /*int*/[1];
int count = OS.gdk_text_property_to_utf8_list_for_display(OS.gdk_display_get_default(), transferData.type, transferData.format, transferData.pValue, transferData.length, list);
if (count == 0) return null;
long /*int*/[] ptr = new long /*int*/[1];
OS.memmove(ptr, list[0], OS.PTR_SIZEOF);
int length = OS.strlen(ptr[0]);
byte[] utf8 = new byte[length];
OS.memmove(utf8, ptr[0], length);
OS.g_strfreev(list[0]);
// convert utf8 byte array to a unicode string
char [] unicode = Converter.mbcsToWcs (utf8);
String string = new String (unicode);
int end = string.indexOf('\0');
return (end == -1) ? string : string.substring(0, end);
}
@Override
protected int[] getTypeIds() {
return new int[] {UTF8_STRING_ID, COMPOUND_TEXT_ID, STRING_ID};
}
@Override
protected String[] getTypeNames() {
return new String[] {UTF8_STRING, COMPOUND_TEXT, STRING};
}
boolean checkText(Object object) {
return (object != null && object instanceof String && ((String)object).length() > 0);
}
@Override
protected boolean validate(Object object) {
return checkText(object);
}
}
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