| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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.CFRange; |
| import org.eclipse.swt.internal.carbon.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. |
| * |
| * <p>An example of a java <code>String</code> containing plain text is shown |
| * below:</p> |
| * |
| * <code><pre> |
| * String textData = "Hello World"; |
| * </code></pre> |
| * |
| * @see Transfer |
| */ |
| public class TextTransfer extends ByteArrayTransfer { |
| |
| private static TextTransfer _instance = new TextTransfer(); |
| private static final String TEXT = "TEXT"; |
| private static final String UTEXT = "utxt"; |
| private static final int TEXTID = OS.kScrapFlavorTypeText; |
| private static final int UTEXTID = OS.kScrapFlavorTypeUnicode; |
| |
| 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; this object |
| * will be filled in on return with the platform specific format of the data |
| * |
| * @see Transfer#javaToNative |
| */ |
| public void javaToNative (Object object, TransferData transferData) { |
| if (!checkText(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| String string = (String)object; |
| char[] chars = new char[string.length()]; |
| string.getChars (0, chars.length, chars, 0); |
| transferData.result = -1; |
| switch (transferData.type) { |
| case TEXTID: { |
| int cfstring = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, chars.length); |
| if (cfstring == 0) return; |
| byte[] buffer = null; |
| 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) return; |
| buffer = new byte[size[0]]; |
| numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', true, buffer, size [0], size); |
| if (numChars == 0) return; |
| } finally { |
| OS.CFRelease(cfstring); |
| } |
| transferData.data = new byte[1][]; |
| transferData.data[0] = buffer; |
| transferData.result = OS.noErr; |
| break; |
| } |
| case UTEXTID: { |
| byte[] buffer = new byte[chars.length * 2]; |
| OS.memcpy(buffer, chars, buffer.length); |
| transferData.data = new byte[1][]; |
| transferData.data[0] = buffer; |
| transferData.result = OS.noErr; |
| break; |
| } |
| } |
| } |
| |
| /** |
| * 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#nativeToJava |
| */ |
| 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]; |
| switch (transferData.type) { |
| case TEXTID: { |
| 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); |
| } |
| } |
| case UTEXTID: { |
| char[] chars = new char[(buffer.length + 1) / 2]; |
| OS.memcpy(chars, buffer, buffer.length); |
| return new String(chars); |
| } |
| } |
| return null; |
| } |
| |
| protected int[] getTypeIds() { |
| return new int[] {UTEXTID, TEXTID}; |
| } |
| |
| protected String[] getTypeNames() { |
| return new String[] {UTEXT, TEXT}; |
| } |
| |
| boolean checkText(Object object) { |
| return (object != null && object instanceof String && ((String)object).length() > 0); |
| } |
| protected boolean validate(Object object) { |
| return checkText(object); |
| } |
| } |