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Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/motif/org/eclipse/swt/dnd/URLTransfer.java')
-rw-r--r-- | bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/motif/org/eclipse/swt/dnd/URLTransfer.java | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/motif/org/eclipse/swt/dnd/URLTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/motif/org/eclipse/swt/dnd/URLTransfer.java new file mode 100644 index 0000000000..9e266354fb --- /dev/null +++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/motif/org/eclipse/swt/dnd/URLTransfer.java @@ -0,0 +1,116 @@ +/******************************************************************************* + * Copyright (c) 2007, 2009 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. The string + * must contain a fully specified url. + * + * <p>An example of a java <code>String</code> containing a URL is shown below:</p> + * + * <code><pre> + * String url = "http://www.eclipse.org"; + * </code></pre> + * + * @see Transfer + * @since 3.4 + */ +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. + * + * @param object a java <code>String</code> containing a URL + * @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 + */ +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>. + * + * @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 + * + * @see Transfer#javaToNative + */ +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); +} +} |