org.eclipse.angus.mail.handlers.handler_base Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.eclipse.angus.mail.handlers;
import jakarta.activation.ActivationDataFlavor;
import jakarta.activation.DataContentHandler;
import jakarta.activation.DataSource;
import java.io.IOException;
/**
* Base class for other DataContentHandlers.
*/
public abstract class handler_base implements DataContentHandler {
/**
* Creates a default {@code handler_base}.
*/
public handler_base() {
}
/**
* Return an array of ActivationDataFlavors that we support.
* Usually there will be only one.
*
* @return array of ActivationDataFlavors that we support
*/
protected abstract ActivationDataFlavor[] getDataFlavors();
/**
* Given the flavor that matched, return the appropriate type of object.
* Usually there's only one flavor so just call getContent.
*
* @param aFlavor the ActivationDataFlavor
* @param ds DataSource containing the data
* @return the object
* @exception IOException for errors reading the data
*/
protected Object getData(ActivationDataFlavor aFlavor, DataSource ds)
throws IOException {
return getContent(ds);
}
/**
* Return the ActivationDataFlavors for this DataContentHandler.
*
* @return The ActivationDataFlavors
*/
@Override
public ActivationDataFlavor[] getTransferDataFlavors() {
ActivationDataFlavor[] adf = getDataFlavors();
if (adf.length == 1) // the common case
return new ActivationDataFlavor[]{adf[0]};
ActivationDataFlavor[] df = new ActivationDataFlavor[adf.length];
System.arraycopy(adf, 0, df, 0, adf.length);
return df;
}
/**
* Return the Transfer Data of type ActivationDataFlavor from InputStream.
*
* @param df The ActivationDataFlavor
* @param ds The DataSource corresponding to the data
* @return the object
* @exception IOException for errors reading the data
*/
@Override
public Object getTransferData(ActivationDataFlavor df, DataSource ds)
throws IOException {
ActivationDataFlavor[] adf = getDataFlavors();
for (int i = 0; i < adf.length; i++) {
// use ActivationDataFlavor.equals, which properly
// ignores Content-Type parameters in comparison
if (adf[i].equals(df))
return getData(adf[i], ds);
}
return null;
}
}