com.sun.mail.handlers.handler_base Maven / Gradle / Ivy
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package com.sun.mail.handlers;
import java.io.IOException;
import javax.activation.*;
/**
* Base class for other DataContentHandlers.
*/
public abstract class handler_base implements DataContentHandler {
/**
* 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 DataFlavors for this DataContentHandler.
*
* @return The DataFlavors
*/
public ActivationDataFlavor[] getTransferDataFlavors() {
return getDataFlavors().clone();
}
/**
* Return the Transfer Data of type DataFlavor from InputStream.
*
* @param df The DataFlavor
* @param ds The DataSource corresponding to the data
* @return the object
* @exception IOException for errors reading the data
*/
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;
}
}