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// $Id$
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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.model;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.EOFException;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.UUID;
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import org.eclipse.swt.dnd.ByteArrayTransfer;
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import org.eclipse.swt.dnd.TransferData;
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import eu.etaxonomy.cdm.model.common.ICdmBase;
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/**
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* @author n.hoffmann
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* @created Feb 8, 2011
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* @version 1.0
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*/
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public abstract class CdmObjectTransfer<T extends ICdmBase> extends ByteArrayTransfer {
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/* (non-Javadoc)
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* @see org.eclipse.swt.dnd.ByteArrayTransfer#javaToNative(java.lang.Object, org.eclipse.swt.dnd.TransferData)
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*/
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@Override
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protected void javaToNative(Object object, TransferData transferData) {
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if (object != null){
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byte[] bytes = toByteArray((T[]) object);
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if (bytes != null)
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super.javaToNative(bytes, transferData);
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}
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}
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/* (non-Javadoc)
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* @see org.eclipse.swt.dnd.ByteArrayTransfer#nativeToJava(org.eclipse.swt.dnd.TransferData)
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*/
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@Override
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protected Object nativeToJava(TransferData transferData) {
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byte[] bytes = (byte[]) super.nativeToJava(transferData);
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if (bytes != null){
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return fromByteArray(bytes);
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}
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return null;
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}
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protected byte[] toByteArray(T[] elements) {
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ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
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DataOutputStream out = new DataOutputStream(byteOut);
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byte[] bytes = null;
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try {
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for(T element : elements){
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writeElementUuid(element, out);
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}
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out.close();
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bytes = byteOut.toByteArray();
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} catch (IOException e) {
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// when in doubt send nothing
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}
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return bytes;
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}
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private void writeElementUuid(T element, DataOutputStream out) throws IOException {
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out.writeUTF(element.getUuid().toString());
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}
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protected Object fromByteArray(byte[] bytes) {
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DataInputStream in = new DataInputStream(
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new ByteArrayInputStream(bytes));
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try {
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List<T> elements = new ArrayList<T>();
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try{
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while(true){
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UUID uuid = readElementUuid(in);
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elements.add(loadElement(uuid));
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}
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}catch(EOFException e){
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return elements.toArray();
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}
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} catch (IOException e) {
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return null;
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}
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}
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public abstract T loadElement(UUID uuid);
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/**
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* @param in
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* @return
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* @throws IOException
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*/
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public UUID readElementUuid(DataInputStream in) throws IOException{
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return UUID.fromString(in.readUTF());
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}
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}
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