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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* 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:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.ui.skynet.artifact;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import org.eclipse.osee.framework.core.data.BranchId;
import org.eclipse.osee.framework.jdk.core.type.OseeCoreException;
import org.eclipse.osee.framework.logging.OseeLog;
import org.eclipse.osee.framework.skynet.core.artifact.Artifact;
import org.eclipse.osee.framework.skynet.core.artifact.ArtifactData;
import org.eclipse.osee.framework.skynet.core.artifact.search.ArtifactQuery;
import org.eclipse.osee.framework.ui.skynet.internal.Activator;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.TransferData;
/**
* The <code>ArtifactTransfer</code> class is used to transfer an array of <code>Artifact</code>s from one part to
* another in a drag and drop operation or a cut, copy, paste action.
* <p>
* In every drag and drop operation there is a <code>DragSource</code> and a <code>DropTarget</code>. When a drag occurs
* a <code>Transfer</code> is used to marshall the drag data from the source into a byte array. If a drop occurs another
* <code>Transfer</code> is used to marshall the byte array into drop data for the target.
* </p>
* <p>
* When a <code>CutAction</code> or a <code>CopyAction</code> is performed, this transfer is used to place references to
* the selected resources on the <code>Clipboard</code>. When a <code>PasteAction</code> is performed, the references on
* the clipboard are used to move or copy the resources to the selected destination.
* </p>
* <p>
* This class can be used for a <code>Viewer<code> or an SWT component directly.
* A singleton is provided which may be serially reused (see <code>getInstance</code>). It is not intended to be
* subclassed.
* </p>
*
* @see org.eclipse.jface.viewers.StructuredViewer
* @see org.eclipse.swt.dnd.DropTarget
* @see org.eclipse.swt.dnd.DragSource
* @author Robert A. Fisher
*/
public class ArtifactTransfer extends ByteArrayTransfer {
/**
* Singleton instance.
*/
private static final ArtifactTransfer instance = new ArtifactTransfer();
// Create a unique ID to make sure that different Eclipse
// applications use different "types" of <code>ResourceTransfer</code>
private static final String TYPE_NAME =
"artifact-transfer-format:" + System.currentTimeMillis() + ":" + instance.hashCode(); //$NON-NLS-2$//$NON-NLS-1$
private static final int TYPEID = registerType(TYPE_NAME);
public static ArtifactTransfer getInstance() {
return instance;
}
@Override
protected int[] getTypeIds() {
return new int[] {TYPEID};
}
@Override
protected String[] getTypeNames() {
return new String[] {TYPE_NAME};
}
@Override
protected void javaToNative(Object data, TransferData transferData) {
if (!(data instanceof ArtifactData)) {
return;
}
ArtifactData artData = (ArtifactData) data;
/**
* The resource serialization format is: (int) number of artifacts Then, the following for each resource: (int)
* artID (int) tagID Then the following (int) urlLength (int) sourceLength (chars) url (chars) source
*/
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream dataOut = new DataOutputStream(out);
// write the number of resources
dataOut.writeInt(artData.getArtifacts().length);
for (Artifact artifact : artData.getArtifacts()) {
writeArtifact(dataOut, artifact);
}
dataOut.writeInt(artData.getUrl().length());
dataOut.writeInt(artData.getSource().length());
dataOut.writeChars(artData.getUrl());
dataOut.writeChars(artData.getSource());
// cleanup
dataOut.close();
out.close();
byte[] bytes = out.toByteArray();
super.javaToNative(bytes, transferData);
} catch (Exception e) {
// it's best to send nothing if there were problems
}
}
@Override
public ArtifactData nativeToJava(TransferData transferData) {
/**
* The resource serialization format is: (int) number of artifacts Then, the following for each resource: (int)
* artID (int) tagID
*/
byte[] bytes = (byte[]) super.nativeToJava(transferData);
if (bytes == null) {
return null;
}
DataInputStream in = new DataInputStream(new ByteArrayInputStream(bytes));
try {
int count = in.readInt();
Artifact[] artifacts = new Artifact[count];
for (int i = 0; i < count; i++) {
artifacts[i] = readArtifact(in);
}
int urlLength = in.readInt();
int sourceLength = in.readInt();
String url = "";
for (int x = 0; x < urlLength; x++) {
url += in.readChar();
}
String source = "";
for (int x = 0; x < sourceLength; x++) {
source += in.readChar();
}
return new ArtifactData(artifacts, url, source);
} catch (Exception ex) {
OseeLog.log(Activator.class, Level.SEVERE, ex);
return null;
}
}
/**
* Reads a resource from the given stream.
*/
private Artifact readArtifact(DataInputStream dataIn) throws OseeCoreException, IOException {
int artID = dataIn.readInt();
long branchUuid = dataIn.readLong();
return ArtifactQuery.getArtifactFromId(artID, BranchId.valueOf(branchUuid));
}
/**
* Writes the given resource to the given stream.
*
* @throws OseeCoreException
*/
private void writeArtifact(DataOutputStream dataOut, Artifact artifact) throws IOException, OseeCoreException {
dataOut.writeInt(artifact.getArtId());
dataOut.writeLong(artifact.getBranch().getId());
}
}
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