javax.activation.ActivationDataFlavor Maven / Gradle / Ivy
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package javax.activation;
import java.awt.datatransfer.DataFlavor;
import java.io.IOException;
import javax.activation.MimeType;
/**
* The ActivationDataFlavor class is a special subclass of
* java.awt.datatransfer.DataFlavor. It allows the JAF to
* set all three values stored by the DataFlavor class via a new
* constructor. It also contains improved MIME parsing in the equals
* method. Except for the improved parsing, its semantics are
* identical to that of the JDK's DataFlavor class.
*/
public class ActivationDataFlavor extends DataFlavor {
/*
* Raison d'etre:
*
* The DataFlavor class included in JDK 1.1 has several limitations
* including piss poor MIME type parsing, and the limitation of
* only supporting serialized objects and InputStreams as
* representation objects. This class 'fixes' that.
*/
// I think for now I'll keep copies of all the variables and
// then later I may choose try to better coexist with the base
// class *sigh*
private String mimeType = null;
private MimeType mimeObject = null;
private String humanPresentableName = null;
private Class representationClass = null;
/**
* Construct a DataFlavor that represents an arbitrary
* Java object. This constructor is an extension of the
* JDK's DataFlavor in that it allows the explicit setting
* of all three DataFlavor attributes.
*
* The returned DataFlavor will have the following characteristics:
*
* representationClass = representationClass
* mimeType = mimeType
* humanName = humanName
*
*
* @param representationClass the class used in this DataFlavor
* @param mimeType the MIME type of the data represented by this class
* @param humanPresentableName the human presentable name of the flavor
*/
public ActivationDataFlavor(Class representationClass,
String mimeType, String humanPresentableName) {
super(mimeType, humanPresentableName); // need to call super
// init private variables:
this.mimeType = mimeType;
this.humanPresentableName = humanPresentableName;
this.representationClass = representationClass;
}
/**
* Construct a DataFlavor that represents a MimeType.
*
* The returned DataFlavor will have the following characteristics:
*
* If the mimeType is "application/x-java-serialized-object;
* class=", the result is the same as calling new
* DataFlavor(Class.forName()) as above.
*
* otherwise:
*
* representationClass = InputStream
* mimeType = mimeType
*
* @param representationClass the class used in this DataFlavor
* @param humanPresentableName the human presentable name of the flavor
*/
public ActivationDataFlavor(Class representationClass,
String humanPresentableName) {
super(representationClass, humanPresentableName);
this.mimeType = super.getMimeType();
this.representationClass = representationClass;
this.humanPresentableName = humanPresentableName;
}
/**
* Construct a DataFlavor that represents a MimeType.
*
* The returned DataFlavor will have the following characteristics:
*
* If the mimeType is "application/x-java-serialized-object; class=",
* the result is the same as calling new DataFlavor(Class.forName()) as
* above, otherwise:
*
* representationClass = InputStream
* mimeType = mimeType
*
* @param mimeType the MIME type of the data represented by this class
* @param humanPresentableName the human presentable name of the flavor
*/
public ActivationDataFlavor(String mimeType, String humanPresentableName) {
super(mimeType, humanPresentableName);
this.mimeType = mimeType;
try {
this.representationClass = Class.forName("java.io.InputStream");
} catch (ClassNotFoundException ex) {
// XXX - should never happen, ignore it
}
this.humanPresentableName = humanPresentableName;
}
/**
* Return the MIME type for this DataFlavor.
*
* @return the MIME type
*/
public String getMimeType() {
return mimeType;
}
/**
* Return the representation class.
*
* @return the representation class
*/
public Class getRepresentationClass() {
return representationClass;
}
/**
* Return the Human Presentable name.
*
* @return the human presentable name
*/
public String getHumanPresentableName() {
return humanPresentableName;
}
/**
* Set the human presentable name.
*
* @param humanPresentableName the name to set
*/
public void setHumanPresentableName(String humanPresentableName) {
this.humanPresentableName = humanPresentableName;
}
/**
* Compares the DataFlavor passed in with this DataFlavor; calls
* the isMimeTypeEqual method.
*
* @param dataFlavor the DataFlavor to compare with
* @return true if the MIME type and representation class
* are the same
*/
public boolean equals(DataFlavor dataFlavor) {
return (isMimeTypeEqual(dataFlavor) &&
dataFlavor.getRepresentationClass() == representationClass);
}
/**
* Is the string representation of the MIME type passed in equivalent
* to the MIME type of this DataFlavor.
*
* ActivationDataFlavor delegates the comparison of MIME types to
* the MimeType class included as part of the JavaBeans Activation
* Framework. This provides a more robust comparison than is normally
* available in the DataFlavor class.
*
* @param mimeType the MIME type
* @return true if the same MIME type
*/
public boolean isMimeTypeEqual(String mimeType) {
MimeType mt = null;
try {
if (mimeObject == null)
mimeObject = new MimeType(this.mimeType);
mt = new MimeType(mimeType);
} catch (MimeTypeParseException e) {
// something didn't parse, do a crude comparison
return this.mimeType.equalsIgnoreCase(mimeType);
}
return mimeObject.match(mt);
}
/**
* Called on DataFlavor for every MIME Type parameter to allow DataFlavor
* subclasses to handle special parameters like the text/plain charset
* parameters, whose values are case insensitive. (MIME type parameter
* values are supposed to be case sensitive).
*
* This method is called for each parameter name/value pair and should
* return the normalized representation of the parameterValue.
* This method is never invoked by this implementation.
*
* @param parameterName the parameter name
* @param parameterValue the parameter value
* @return the normalized parameter value
* @deprecated
*/
protected String normalizeMimeTypeParameter(String parameterName,
String parameterValue) {
return parameterValue;
}
/**
* Called for each MIME type string to give DataFlavor subtypes the
* opportunity to change how the normalization of MIME types is
* accomplished.
* One possible use would be to add default parameter/value pairs in cases
* where none are present in the MIME type string passed in.
* This method is never invoked by this implementation.
*
* @param mimeType the MIME type
* @return the normalized MIME type
* @deprecated
*/
protected String normalizeMimeType(String mimeType) {
return mimeType;
}
}