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/*******************************************************************************
* Copyright (c) 2000, 2017 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.examples.clipboard;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.TransferData;
public class MyTypeTransfer extends ByteArrayTransfer {
private static final String MYTYPENAME = "name_list"; //$NON-NLS-1$
private static final int MYTYPEID = registerType(MYTYPENAME);
private static MyTypeTransfer _instance = new MyTypeTransfer();
public static MyTypeTransfer getInstance () {
return _instance;
}
@Override
public void javaToNative (Object object, TransferData transferData) {
if (!checkMyType(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
MyType[] myTypes = (MyType[]) object;
try {
// write data to a byte array and then ask super to convert to pMedium
ByteArrayOutputStream out = new ByteArrayOutputStream();
try (DataOutputStream writeOut = new DataOutputStream(out)) {
for (MyType myType : myTypes) {
byte[] buffer = myType.firstName.getBytes();
writeOut.writeInt(buffer.length);
writeOut.write(buffer);
buffer = myType.firstName.getBytes();
writeOut.writeInt(buffer.length);
writeOut.write(buffer);
}
byte[] buffer = out.toByteArray();
super.javaToNative(buffer, transferData);
}
} catch (IOException e) {
}
}
@Override
public Object nativeToJava(TransferData transferData){
if (isSupportedType(transferData)) {
byte[] buffer = (byte[])super.nativeToJava(transferData);
if (buffer == null) return null;
MyType[] myData = new MyType[0];
try {
ByteArrayInputStream in = new ByteArrayInputStream(buffer);
try (DataInputStream readIn = new DataInputStream(in)) {
while(readIn.available() > 20) {
MyType datum = new MyType();
int size = readIn.readInt();
byte[] name = new byte[size];
readIn.read(name);
datum.firstName = new String(name);
size = readIn.readInt();
name = new byte[size];
readIn.read(name);
datum.lastName = new String(name);
MyType[] newMyData = new MyType[myData.length + 1];
System.arraycopy(myData, 0, newMyData, 0, myData.length);
newMyData[myData.length] = datum;
myData = newMyData;
}
}
} catch (IOException ex) {
return null;
}
return myData;
}
return null;
}
@Override
protected String[] getTypeNames(){
return new String[]{MYTYPENAME};
}
@Override
protected int[] getTypeIds(){
return new int[] {MYTYPEID};
}
boolean checkMyType(Object object) {
if (object == null || !(object instanceof MyType[]) || ((MyType[])object).length == 0) return false;
MyType[] myTypes = (MyType[])object;
for (MyType myType : myTypes) {
if (myType == null ||
myType.firstName == null ||
myType.firstName.length() == 0 ||
myType.lastName == null ||
myType.lastName.length() == 0) return false;
}
return true;
}
@Override
protected boolean validate(Object object) {
return checkMyType(object);
}
}
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