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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
****************************************************************/
package org.apache.cayenne.modeler.util;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;
import java.util.List;
import org.apache.cayenne.util.XMLEncoder;
import org.apache.cayenne.util.XMLSerializable;
/**
* CayenneTransferable is a data holder of Cayenne object(s), like
* Entities, Attributes, Relationships etc.
*/
public class CayenneTransferable implements Transferable {
/**
* Flavor used for copy-paste between Cayenne Modeler applications
*/
public static final DataFlavor CAYENNE_FLAVOR = new DataFlavor(Serializable.class, "Cayenne Object");
/**
* Supported flavors
*/
private static final DataFlavor[] FLAVORS = new DataFlavor[] { CAYENNE_FLAVOR, DataFlavor.stringFlavor };
/**
* Data in the buffer
*/
private Object data;
public CayenneTransferable(Object data) {
this.data = data;
}
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException,
IOException {
if (flavor == CAYENNE_FLAVOR) {
return data;
}
else {
StringWriter out = new StringWriter();
XMLEncoder encoder = new XMLEncoder(new PrintWriter(out), "\t");
encoder.println("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
if (data instanceof XMLSerializable) {
((XMLSerializable) data).encodeAsXML(encoder);
}
else if (data instanceof List) {
for (Object o : (List) data) {
((XMLSerializable) o).encodeAsXML(encoder);
}
}
return out.toString();
}
}
public DataFlavor[] getTransferDataFlavors() {
return FLAVORS;
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
return flavor == CAYENNE_FLAVOR || flavor == DataFlavor.stringFlavor;
}
}