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package eu.etaxonomy.taxeditor.model;
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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.taxon.TaxonBase;
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/**
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* For drag and drop - a drag widget with this transfer type can only be dropped onto
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* a drop widget with the same type.
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*
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* @author p.ciardelli
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* @version $Id: $
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*/
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public class TaxonTransfer extends ByteArrayTransfer {
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private static final String TAXONTYPENAME = "taxon_type";
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private static final int TAXONTYPEID = registerType (TAXONTYPENAME);
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private static final TaxonTransfer INSTANCE = new TaxonTransfer();
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/*
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* The object associated with this transfer event
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*/
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private TaxonBase<?> taxonBase;
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/*
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* Returns the singleton
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*/
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/**
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* <p>getInstance</p>
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*
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* @return a {@link eu.etaxonomy.taxeditor.model.TaxonTransfer} object.
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*/
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public static TaxonTransfer getInstance() {
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return INSTANCE;
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}
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/*
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* Set transfer data for local use
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*/
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/**
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* <p>setTaxon</p>
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*
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* @param taxon a {@link eu.etaxonomy.cdm.model.taxon.TaxonBase} object.
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*/
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public void setTaxon(TaxonBase<?> taxon) {
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this.taxonBase = taxon;
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}
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/*
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* Returns the local transfer data
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*/
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/**
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* <p>getTaxon</p>
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*
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* @return a {@link eu.etaxonomy.cdm.model.taxon.TaxonBase} object.
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*/
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public TaxonBase<?> getTaxon() {
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return taxonBase;
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}
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/*
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* The type ID is used to identify this transfer
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*/
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/** {@inheritDoc} */
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@Override
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protected int[] getTypeIds() {
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return new int[] { TAXONTYPEID };
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}
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/** {@inheritDoc} */
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@Override
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protected String[] getTypeNames() {
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return new String[] { TAXONTYPENAME } ;
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}
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/** {@inheritDoc} */
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@Override
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protected void javaToNative(Object object, TransferData transferData) {
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// No encoding needed since this is a hardcoded string read and written
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// in the same process.
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// See nativeToJava below
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byte[] check = TAXONTYPENAME.getBytes();
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super.javaToNative(check, transferData);
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}
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/** {@inheritDoc} */
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@Override
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protected Object nativeToJava(TransferData transferData) {
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Object result = super.nativeToJava(transferData);
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if (isInvalidNativeType(result)) {
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throw new RuntimeException(); //$NON-NLS-1$
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}
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return taxonBase;
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}
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private boolean isInvalidNativeType(Object result) {
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// No encoding needed since this is a hardcoded string read and written
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// in the same process.
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// See javaToNative above
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return !(result instanceof byte[])
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|| !TAXONTYPENAME.equals(new String((byte[]) result));
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}
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}
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