| /******************************************************************************* |
| * 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.dltk.internal.corext.refactoring.reorg; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import org.eclipse.dltk.core.DLTKCore; |
| import org.eclipse.dltk.core.IModelElement; |
| import org.eclipse.swt.dnd.ByteArrayTransfer; |
| import org.eclipse.swt.dnd.TransferData; |
| |
| |
| public class ModelElementTransfer extends ByteArrayTransfer { |
| |
| /** |
| * Singleton instance. |
| */ |
| private static final ModelElementTransfer fInstance= new ModelElementTransfer(); |
| |
| // Create a unique ID to make sure that different Eclipse |
| // applications use different "types" of <code>ScriptElementTransfer</code> |
| private static final String TYPE_NAME= "model-element-transfer-format:" + System.currentTimeMillis() + ":" + fInstance.hashCode(); //$NON-NLS-2$//$NON-NLS-1$ |
| |
| private static final int TYPEID= registerType(TYPE_NAME); |
| |
| private ModelElementTransfer() { |
| } |
| |
| /** |
| * Returns the singleton instance. |
| * |
| * @return the singleton instance |
| */ |
| public static ModelElementTransfer getInstance() { |
| return fInstance; |
| } |
| |
| /* (non-Javadoc) |
| * Method declared on Transfer. |
| */ |
| protected int[] getTypeIds() { |
| return new int[] { TYPEID }; |
| } |
| /* (non-Javadoc) |
| * Returns the type names. |
| * |
| * @return the list of type names |
| */ |
| protected String[] getTypeNames() { |
| return new String[] { TYPE_NAME }; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.dnd.Transfer#javaToNative(java.lang.Object, org.eclipse.swt.dnd.TransferData) |
| */ |
| protected void javaToNative(Object data, TransferData transferData) { |
| if (!(data instanceof IModelElement[])) |
| return; |
| |
| IModelElement[] modelElements= (IModelElement[]) data; |
| /* |
| * The element serialization format is: |
| * (int) number of element |
| * Then, the following for each element: |
| * (String) handle identifier |
| */ |
| |
| try { |
| ByteArrayOutputStream out= new ByteArrayOutputStream(); |
| DataOutputStream dataOut= new DataOutputStream(out); |
| |
| //write the number of elements |
| dataOut.writeInt(modelElements.length); |
| |
| //write each element |
| for (int i= 0; i < modelElements.length; i++) { |
| writeScriptElement(dataOut, modelElements[i]); |
| } |
| |
| //cleanup |
| dataOut.close(); |
| out.close(); |
| byte[] bytes= out.toByteArray(); |
| super.javaToNative(bytes, transferData); |
| } catch (IOException e) { |
| //it's best to send nothing if there were problems |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.dnd.Transfer#nativeToScript(org.eclipse.swt.dnd.TransferData) |
| */ |
| protected Object nativeToJava(TransferData transferData) { |
| /* |
| * The element serialization format is: |
| * (int) number of element |
| * Then, the following for each element: |
| * (String) handle identifier |
| */ |
| |
| byte[] bytes= (byte[]) super.nativeToJava(transferData); |
| if (bytes == null) |
| return null; |
| DataInputStream in= new DataInputStream(new ByteArrayInputStream(bytes)); |
| try { |
| int count= in.readInt(); |
| IModelElement[] results= new IModelElement[count]; |
| for (int i= 0; i < count; i++) { |
| results[i]= readScriptElement(in); |
| } |
| return results; |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| private IModelElement readScriptElement(DataInputStream dataIn) throws IOException { |
| String handleIdentifier= dataIn.readUTF(); |
| return DLTKCore.create(handleIdentifier); |
| } |
| |
| private static void writeScriptElement(DataOutputStream dataOut, IModelElement element) throws IOException { |
| dataOut.writeUTF(element.getHandleIdentifier()); |
| } |
| } |