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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed 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 com.intellij.uiDesigner;
import com.intellij.openapi.diagnostic.Logger;
import org.jetbrains.annotations.Nullable;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.util.HashMap;
import java.util.Map;
import java.io.IOException;
/**
* @author yole
*/
public final class SimpleTransferable<T> implements Transferable {
private static final Logger LOG = Logger.getInstance("#com.intellij.uiDesigner.SimpleTransferable");
private static final Map<String, DataFlavor> ourDataFlavorMap = new HashMap<String, DataFlavor>();
private final T myDataProxy;
private final Class<T> myDataClass;
private final DataFlavor myDataFlavor;
public SimpleTransferable(final T data, final Class<T> dataClass) {
myDataProxy = data;
myDataClass = dataClass;
myDataFlavor = getDataFlavor(myDataClass);
}
public SimpleTransferable(final T data, final Class<T> dataClass, DataFlavor flavor) {
myDataProxy = data;
myDataClass = dataClass;
myDataFlavor = flavor;
}
@Nullable
public Object getTransferData(final DataFlavor flavor) {
try {
if (!myDataFlavor.equals(flavor)) {
return null;
}
return myDataProxy;
}
catch (Exception e) {
LOG.error(e);
return null;
}
}
private static <T> DataFlavor getDataFlavor(final Class<T> dataClass) {
DataFlavor result = ourDataFlavorMap.get(dataClass.getName());
if (result == null) {
try {
result = new DataFlavor(DataFlavor.javaJVMLocalObjectMimeType);
ourDataFlavorMap.put(dataClass.getName(), result);
}
catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
return result;
}
public DataFlavor[] getTransferDataFlavors() {
try {
return new DataFlavor[]{ myDataFlavor };
}
catch(Exception ex) {
LOG.error(ex);
return new DataFlavor[0];
}
}
public boolean isDataFlavorSupported(final DataFlavor flavor) {
try {
return flavor.equals(myDataFlavor);
}
catch(Exception ex) {
LOG.error(ex);
return false;
}
}
@Nullable public static <T> T getData(Transferable transferable, Class<T> dataClass) {
try {
final DataFlavor dataFlavor = getDataFlavor(dataClass);
if (!transferable.isDataFlavorSupported(dataFlavor)) {
return null;
}
final Object transferData = transferable.getTransferData(dataFlavor);
if (!dataClass.isInstance(transferData)) {
return null;
}
//noinspection unchecked
return (T) transferData;
}
catch(IOException e) {
return null;
}
catch (Exception e) {
LOG.error(e);
return null;
}
}
}
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