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.mimeType = "application/x-java-serialized-object"; 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(ActivationDataFlavor dataFlavor) {
return (isMimeTypeEqual(dataFlavor.mimeType) &&
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; } }