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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/datatransfer/DataFlavor.java
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+/* DataFlavor.java -- A type of data to transfer via the clipboard.
+ Copyright (C) 1999, 2001, 2004, 2005, 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt.datatransfer;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.io.OptionalDataException;
+import java.io.Reader;
+import java.io.Serializable;
+import java.io.StringReader;
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.rmi.Remote;
+
+/**
+ * This class represents a particular data format used for transferring
+ * data via the clipboard.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+public class DataFlavor implements java.io.Externalizable, Cloneable
+{
+ static final long serialVersionUID = 8367026044764648243L;
+
+ // FIXME: Serialization: Need to write methods for.
+
+ /**
+ * This is the data flavor used for tranferring plain text. The MIME
+ * type is "text/plain; charset=unicode". The representation class
+ * is <code>java.io.InputStream</code>.
+ *
+ * @deprecated The charset unicode is platform specific and InputStream
+ * deals with bytes not chars. Use <code>getRederForText()</code>.
+ */
+ public static final DataFlavor plainTextFlavor =
+ new DataFlavor("text/plain; charset=unicode; class=java.io.InputStream",
+ "plain unicode text");
+
+ /**
+ * This is the data flavor used for transferring Java strings. The
+ * MIME type is "application/x-java-serialized-object" and the
+ * representation class is <code>java.lang.String</code>.
+ */
+ public static final DataFlavor stringFlavor =
+ new DataFlavor(java.lang.String.class, "Java Unicode String");
+
+ /**
+ * This is a data flavor used for transferring lists of files. The
+ * representation type is a <code>java.util.List</code>, with each
+ * element of the list being a <code>java.io.File</code>.
+ */
+ public static final DataFlavor javaFileListFlavor =
+ new DataFlavor("application/x-java-file-list; class=java.util.List",
+ "Java File List");
+
+ /**
+ * This is an image flavor used for transferring images. The
+ * representation type is a <code>java.awt.Image</code>.
+ */
+ public static final DataFlavor imageFlavor =
+ new DataFlavor(java.awt.Image.class, "Java Image");
+
+ /**
+ * This is the MIME type used for transferring a serialized object.
+ * The representation class is the type of object be deserialized.
+ */
+ public static final String javaSerializedObjectMimeType =
+ "application/x-java-serialized-object";
+
+ /**
+ * This is the MIME type used to transfer a Java object reference within
+ * the same JVM. The representation class is the class of the object
+ * being transferred.
+ */
+ public static final String javaJVMLocalObjectMimeType =
+ "application/x-java-jvm-local-objectref";
+
+ /**
+ * This is the MIME type used to transfer a link to a remote object.
+ * The representation class is the type of object being linked to.
+ */
+ public static final String javaRemoteObjectMimeType =
+ "application/x-java-remote-object";
+
+ /*
+ * Instance Variables
+ */
+
+ // The MIME type for this flavor
+ private MimeType mimeType;
+
+ // The representation class for this flavor
+ private Class<?> representationClass;
+
+ // The human readable name of this flavor
+ private String humanPresentableName;
+
+ /*
+ * Static Methods
+ */
+
+ /**
+ * This method attempts to load the named class. The following class
+ * loaders are searched in order: the bootstrap class loader, the
+ * system class loader, the context class loader (if it exists), and
+ * the specified fallback class loader.
+ *
+ * @param className The name of the class to load.
+ * @param classLoader The class loader to use if all others fail, which
+ * may be <code>null</code>.
+ *
+ * @exception ClassNotFoundException If the class cannot be loaded.
+ */
+ protected static final Class<?> tryToLoadClass(String className,
+ ClassLoader classLoader)
+ throws ClassNotFoundException
+ {
+ // Bootstrap
+ try
+ {
+ return Class.forName(className);
+ }
+ catch(ClassNotFoundException cnfe)
+ {
+ // Ignored.
+ }
+
+ // System
+ try
+ {
+ ClassLoader loader = ClassLoader.getSystemClassLoader();
+ return Class.forName(className, true, loader);
+ }
+ catch(ClassNotFoundException cnfe)
+ {
+ // Ignored.
+ }
+
+ // Context
+ try
+ {
+ ClassLoader loader = Thread.currentThread().getContextClassLoader();
+ return Class.forName(className, true, loader);
+ }
+ catch(ClassNotFoundException cnfe)
+ {
+ // Ignored.
+ }
+
+ if (classLoader != null)
+ return Class.forName(className, true, classLoader);
+
+ throw new ClassNotFoundException(className);
+ }
+
+ /**
+ * XXX - Currently returns <code>plainTextFlavor</code>.
+ */
+ public static final DataFlavor getTextPlainUnicodeFlavor()
+ {
+ return plainTextFlavor;
+ }
+
+ /**
+ * Selects the best supported text flavor on this implementation.
+ * Returns <code>null</code> when none of the given flavors is liked.
+ *
+ * The <code>DataFlavor</code> returned the first data flavor in the
+ * array that has either a representation class which is (a subclass of)
+ * <code>Reader</code> or <code>String</code>, or has a representation
+ * class which is (a subclass of) <code>InputStream</code> and has a
+ * primary MIME type of "text" and has an supported encoding.
+ */
+ public static final DataFlavor
+ selectBestTextFlavor(DataFlavor[] availableFlavors)
+ {
+ for(int i = 0; i < availableFlavors.length; i++)
+ {
+ DataFlavor df = availableFlavors[i];
+ Class c = df.representationClass;
+
+ // A Reader or String is good.
+ if ((Reader.class.isAssignableFrom(c))
+ || (String.class.isAssignableFrom(c)))
+ return df;
+
+ // A InputStream is good if the mime primary type is "text"
+ if ((InputStream.class.isAssignableFrom(c))
+ && ("text".equals(df.getPrimaryType())))
+ {
+ String encoding = availableFlavors[i].getParameter("charset");
+ if (encoding == null)
+ encoding = "us-ascii";
+ Reader r = null;
+ try
+ {
+ // Try to construct a dummy reader with the found encoding
+ r = new InputStreamReader
+ (new ByteArrayInputStream(new byte[0]), encoding);
+ }
+ catch(UnsupportedEncodingException uee) { /* ignore */ }
+
+ if (r != null)
+ return df;
+ }
+ }
+
+ // Nothing found
+ return null;
+ }
+
+
+ /*
+ * Constructors
+ */
+
+ /**
+ * Empty public constructor needed for externalization.
+ * Should not be used for normal instantiation.
+ */
+ public DataFlavor()
+ {
+ // Used for deserialization only, nothing to do here.
+ }
+
+ /**
+ * Initializes a new instance of <code>DataFlavor</code>. The class
+ * and human readable name are specified, the MIME type will be
+ * "application/x-java-serialized-object". If the human readable name
+ * is not specified (<code>null</code>) then the human readable name
+ * will be the same as the MIME type.
+ *
+ * @param representationClass The representation class for this object.
+ * @param humanPresentableName The display name of the object.
+ */
+ public DataFlavor(Class<?> representationClass, String humanPresentableName)
+ {
+ if (representationClass == null)
+ throw new NullPointerException("representationClass must not be null");
+ try
+ {
+ mimeType = new MimeType(javaSerializedObjectMimeType);
+ }
+ catch (MimeTypeParseException ex)
+ {
+ // Must not happen as we use a constant string.
+ assert false;
+ }
+ if (humanPresentableName == null)
+ humanPresentableName = javaSerializedObjectMimeType;
+ this.humanPresentableName = humanPresentableName;
+ this.representationClass = representationClass;
+ }
+
+ /**
+ * Initializes a new instance of <code>DataFlavor</code> with the
+ * specified MIME type and description. If the MIME type has a
+ * "class=&lt;rep class&gt;" parameter then the representation class will
+ * be the class name specified. Otherwise the class defaults to
+ * <code>java.io.InputStream</code>. If the human readable name
+ * is not specified (<code>null</code>) then the human readable name
+ * will be the same as the MIME type.
+ *
+ * @param mimeType The MIME type for this flavor.
+ * @param humanPresentableName The display name of this flavor.
+ * @param classLoader The class loader for finding classes if the default
+ * class loaders do not work.
+ *
+ * @exception IllegalArgumentException If the representation class
+ * specified cannot be loaded.
+ * @exception ClassNotFoundException If the class is not loaded.
+ */
+ public DataFlavor(String mimeType, String humanPresentableName,
+ ClassLoader classLoader)
+ throws ClassNotFoundException
+ {
+ init(mimeType, humanPresentableName, classLoader);
+ }
+
+ /**
+ * Initializes a new instance of <code>DataFlavor</code> with the
+ * specified MIME type and description. If the MIME type has a
+ * "class=&lt;rep class&gt;" parameter then the representation class will
+ * be the class name specified. Otherwise the class defaults to
+ * <code>java.io.InputStream</code>. If the human readable name
+ * is not specified (<code>null</code>) then the human readable name
+ * will be the same as the MIME type. This is the same as calling
+ * <code>new DataFlavor(mimeType, humanPresentableName, null)</code>.
+ *
+ * @param mimeType The MIME type for this flavor.
+ * @param humanPresentableName The display name of this flavor.
+ *
+ * @exception IllegalArgumentException If the representation class
+ * specified cannot be loaded.
+ */
+ public DataFlavor(String mimeType, String humanPresentableName)
+ {
+ try
+ {
+ init(mimeType, humanPresentableName, getClass().getClassLoader());
+ }
+ catch (ClassNotFoundException ex)
+ {
+ IllegalArgumentException iae =
+ new IllegalArgumentException("Class not found: " + ex.getMessage());
+ iae.initCause(ex);
+ throw iae;
+ }
+ }
+
+ /**
+ * Initializes a new instance of <code>DataFlavor</code> with the specified
+ * MIME type. This type can have a "class=" parameter to specify the
+ * representation class, and then the class must exist or an exception will
+ * be thrown. If there is no "class=" parameter then the representation class
+ * will be <code>java.io.InputStream</code>. This is the same as calling
+ * <code>new DataFlavor(mimeType, null)</code>.
+ *
+ * @param mimeType The MIME type for this flavor.
+ *
+ * @exception IllegalArgumentException If a class is not specified in
+ * the MIME type.
+ * @exception ClassNotFoundException If the class cannot be loaded.
+ */
+ public DataFlavor(String mimeType) throws ClassNotFoundException
+ {
+ init(mimeType, null, getClass().getClassLoader());
+ }
+
+ /**
+ * Called by various constructors to initialize this object.
+ *
+ * @param mime the mime string
+ * @param humanPresentableName the human presentable name
+ * @param loader the class loader to use for loading the representation
+ * class
+ */
+ private void init(String mime, String humanPresentableName,
+ ClassLoader loader)
+ throws ClassNotFoundException
+ {
+ if (mime == null)
+ throw new NullPointerException("The mime type must not be null");
+ try
+ {
+ mimeType = new MimeType(mime);
+ }
+ catch (MimeTypeParseException ex)
+ {
+ IllegalArgumentException iae =
+ new IllegalArgumentException("Invalid mime type");
+ iae.initCause(ex);
+ throw iae;
+ }
+ String className = mimeType.getParameter("class");
+ if (className == null)
+ {
+ if (mimeType.getBaseType().equals(javaSerializedObjectMimeType))
+ throw new IllegalArgumentException("Serialized object type must have"
+ + " a representation class parameter");
+ else
+ representationClass = java.io.InputStream.class;
+ }
+ else
+ representationClass = tryToLoadClass(className, loader);
+ mimeType.addParameter("class", representationClass.getName());
+
+ if (humanPresentableName == null)
+ {
+ humanPresentableName = mimeType.getParameter("humanPresentableName");
+ if (humanPresentableName == null)
+ humanPresentableName = mimeType.getBaseType();
+ }
+ this.humanPresentableName = humanPresentableName;
+ }
+
+ /**
+ * Returns the MIME type of this flavor.
+ *
+ * @return The MIME type for this flavor.
+ */
+ public String getMimeType()
+ {
+ return(mimeType.toString());
+ }
+
+ /**
+ * Returns the representation class for this flavor.
+ *
+ * @return The representation class for this flavor.
+ */
+ public Class<?> getRepresentationClass()
+ {
+ return(representationClass);
+ }
+
+ /**
+ * Returns the human presentable name for this flavor.
+ *
+ * @return The human presentable name for this flavor.
+ */
+ public String getHumanPresentableName()
+ {
+ return(humanPresentableName);
+ }
+
+ /**
+ * Returns the primary MIME type for this flavor.
+ *
+ * @return The primary MIME type for this flavor.
+ */
+ public String getPrimaryType()
+ {
+ return(mimeType.getPrimaryType());
+ }
+
+ /**
+ * Returns the MIME subtype for this flavor.
+ *
+ * @return The MIME subtype for this flavor.
+ */
+ public String getSubType()
+ {
+ return mimeType.getSubType();
+ }
+
+ /**
+ * Returns the value of the named MIME type parameter, or <code>null</code>
+ * if the parameter does not exist.
+ *
+ * @param paramName The name of the paramter.
+ *
+ * @return The value of the parameter.
+ */
+ public String getParameter(String paramName)
+ {
+ if ("humanPresentableName".equals(paramName))
+ return getHumanPresentableName();
+
+ return mimeType.getParameter(paramName);
+ }
+
+ /**
+ * Sets the human presentable name to the specified value.
+ *
+ * @param humanPresentableName The new display name.
+ */
+ public void setHumanPresentableName(String humanPresentableName)
+ {
+ this.humanPresentableName = humanPresentableName;
+ }
+
+ /**
+ * Tests the MIME type of this object for equality against the specified
+ * MIME type. Ignores parameters.
+ *
+ * @param mimeType The MIME type to test against.
+ *
+ * @return <code>true</code> if the MIME type is equal to this object's
+ * MIME type (ignoring parameters), <code>false</code> otherwise.
+ *
+ * @exception NullPointerException If mimeType is null.
+ */
+ public boolean isMimeTypeEqual(String mimeType)
+ {
+ if (mimeType == null)
+ throw new NullPointerException("mimeType must not be null");
+ boolean equal = false;
+ try
+ {
+ if (this.mimeType != null)
+ {
+ MimeType other = new MimeType(mimeType);
+ equal = this.mimeType.matches(other);
+ }
+ }
+ catch (MimeTypeParseException ex)
+ {
+ // Return false in this case.
+ }
+ return equal;
+ }
+
+ /**
+ * Tests the MIME type of this object for equality against the specified
+ * data flavor's MIME type
+ *
+ * @param flavor The flavor to test against.
+ *
+ * @return <code>true</code> if the flavor's MIME type is equal to this
+ * object's MIME type, <code>false</code> otherwise.
+ */
+ public final boolean isMimeTypeEqual(DataFlavor flavor)
+ {
+ return isMimeTypeEqual(flavor.getMimeType());
+ }
+
+ /**
+ * Tests whether or not this flavor represents a serialized object.
+ *
+ * @return <code>true</code> if this flavor represents a serialized
+ * object, <code>false</code> otherwise.
+ */
+ public boolean isMimeTypeSerializedObject()
+ {
+ return isMimeTypeEqual(javaSerializedObjectMimeType);
+ }
+
+ /**
+ * Tests whether or not this flavor has a representation class of
+ * <code>java.io.InputStream</code>.
+ *
+ * @return <code>true</code> if the representation class of this flavor
+ * is <code>java.io.InputStream</code>, <code>false</code> otherwise.
+ */
+ public boolean isRepresentationClassInputStream()
+ {
+ return InputStream.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Tests whether the representation class for this flavor is
+ * serializable.
+ *
+ * @return <code>true</code> if the representation class is serializable,
+ * <code>false</code> otherwise.
+ */
+ public boolean isRepresentationClassSerializable()
+ {
+ return Serializable.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Tests whether the representation class for his flavor is remote.
+ *
+ * @return <code>true</code> if the representation class is remote,
+ * <code>false</code> otherwise.
+ */
+ public boolean isRepresentationClassRemote()
+ {
+ return Remote.class.isAssignableFrom (representationClass);
+ }
+
+ /**
+ * Tests whether or not this flavor represents a serialized object.
+ *
+ * @return <code>true</code> if this flavor represents a serialized
+ * object, <code>false</code> otherwise.
+ */
+ public boolean isFlavorSerializedObjectType()
+ {
+ return isRepresentationClassSerializable()
+ && isMimeTypeEqual(javaSerializedObjectMimeType);
+ }
+
+ /**
+ * Tests whether or not this flavor represents a remote object.
+ *
+ * @return <code>true</code> if this flavor represents a remote object,
+ * <code>false</code> otherwise.
+ */
+ public boolean isFlavorRemoteObjectType()
+ {
+ return isRepresentationClassRemote()
+ && isRepresentationClassSerializable()
+ && isMimeTypeEqual(javaRemoteObjectMimeType);
+ }
+
+ /**
+ * Tests whether or not this flavor represents a list of files.
+ *
+ * @return <code>true</code> if this flavor represents a list of files,
+ * <code>false</code> otherwise.
+ */
+ public boolean isFlavorJavaFileListType()
+ {
+ if (getPrimaryType().equals(javaFileListFlavor.getPrimaryType())
+ && getSubType().equals(javaFileListFlavor.getSubType())
+ && javaFileListFlavor.representationClass
+ .isAssignableFrom(representationClass))
+ return true;
+
+ return false ;
+ }
+
+ /**
+ * Returns a copy of this object.
+ *
+ * @return A copy of this object.
+ *
+ * @exception CloneNotSupportedException If the object's class does not support
+ * the Cloneable interface. Subclasses that override the clone method can also
+ * throw this exception to indicate that an instance cannot be cloned.
+ */
+ public Object clone () throws CloneNotSupportedException
+ {
+ // FIXME - This cannot be right.
+ try
+ {
+ return super.clone();
+ }
+ catch(Exception e)
+ {
+ return null;
+ }
+ }
+
+ /**
+ * This method test the specified <code>DataFlavor</code> for equality
+ * against this object. This will be true if the MIME type and
+ * representation class are the equal. If the primary type is 'text'
+ * then also the value of the charset parameter is compared. In such a
+ * case when the charset parameter isn't given then the charset is
+ * assumed to be equal to the default charset of the platform. All
+ * other parameters are ignored.
+ *
+ * @param flavor The <code>DataFlavor</code> to test against.
+ *
+ * @return <code>true</code> if the flavor is equal to this object,
+ * <code>false</code> otherwise.
+ */
+ public boolean equals(DataFlavor flavor)
+ {
+ if (flavor == null)
+ return false;
+
+ String primary = getPrimaryType();
+ if (! primary.equals(flavor.getPrimaryType()))
+ return false;
+
+ String sub = getSubType();
+ if (! sub.equals(flavor.getSubType()))
+ return false;
+
+ if (! this.representationClass.equals(flavor.representationClass))
+ return false;
+
+ if (primary.equals("text"))
+ if (! isRepresentationClassCharBuffer()
+ && ! isRepresentationClassReader()
+ && representationClass != java.lang.String.class
+ && ! (representationClass.isArray()
+ && representationClass.getComponentType() == Character.TYPE))
+ {
+ String charset = getParameter("charset");
+ String otherset = flavor.getParameter("charset");
+ String defaultset = Charset.defaultCharset().name();
+
+ if (charset == null || charset.equals(defaultset))
+ return (otherset == null || otherset.equals(defaultset));
+
+ return charset.equals(otherset);
+ }
+
+ return true;
+ }
+
+ /**
+ * This method test the specified <code>Object</code> for equality
+ * against this object. This will be true if the following conditions
+ * are met:
+ * <p>
+ * <ul>
+ * <li>The object is not <code>null</code>.</li>
+ * <li>The object is an instance of <code>DataFlavor</code>.</li>
+ * <li>The object's MIME type and representation class are equal to
+ * this object's.</li>
+ * </ul>
+ *
+ * @param obj The <code>Object</code> to test against.
+ *
+ * @return <code>true</code> if the flavor is equal to this object,
+ * <code>false</code> otherwise.
+ */
+ public boolean equals(Object obj)
+ {
+ if (! (obj instanceof DataFlavor))
+ return false;
+
+ return equals((DataFlavor) obj);
+ }
+
+ /**
+ * Tests whether or not the specified string is equal to the MIME type
+ * of this object.
+ *
+ * @param str The string to test against.
+ *
+ * @return <code>true</code> if the string is equal to this object's MIME
+ * type, <code>false</code> otherwise.
+ *
+ * @deprecated Not compatible with <code>hashCode()</code>.
+ * Use <code>isMimeTypeEqual()</code>
+ */
+ public boolean equals(String str)
+ {
+ return isMimeTypeEqual(str);
+ }
+
+ /**
+ * Returns the hash code for this data flavor.
+ * The hash code is based on the (lower case) mime type and the
+ * representation class.
+ */
+ public int hashCode()
+ {
+ return mimeType.toString().hashCode() ^ representationClass.hashCode();
+ }
+
+ /**
+ * Returns <code>true</code> when the given <code>DataFlavor</code>
+ * matches this one.
+ */
+ public boolean match(DataFlavor dataFlavor)
+ {
+ // XXX - How is this different from equals?
+ return equals(dataFlavor);
+ }
+
+ /**
+ * This method exists for backward compatibility. It simply returns
+ * the same name/value pair passed in.
+ *
+ * @param name The parameter name.
+ * @param value The parameter value.
+ *
+ * @return The name/value pair.
+ *
+ * @deprecated
+ */
+ protected String normalizeMimeTypeParameter(String name, String value)
+ {
+ return name + "=" + value;
+ }
+
+ /**
+ * This method exists for backward compatibility. It simply returns
+ * the MIME type string unchanged.
+ *
+ * @param type The MIME type.
+ *
+ * @return The MIME type.
+ *
+ * @deprecated
+ */
+ protected String normalizeMimeType(String type)
+ {
+ return type;
+ }
+
+ /**
+ * Serialize this class.
+ *
+ * @param stream The <code>ObjectOutput</code> stream to serialize to.
+ *
+ * @exception IOException If an error occurs.
+ */
+ public void writeExternal(ObjectOutput stream)
+ throws IOException
+ {
+ if (mimeType != null)
+ {
+ mimeType.addParameter("humanPresentableName", humanPresentableName);
+ stream.writeObject(mimeType);
+ mimeType.removeParameter("humanPresentableName");
+ }
+ else
+ stream.writeObject(null);
+ stream.writeObject(representationClass);
+ }
+
+
+ /**
+ * De-serialize this class.
+ *
+ * @param stream The <code>ObjectInput</code> stream to deserialize from.
+ *
+ * @exception IOException If an error ocurs.
+ * @exception ClassNotFoundException If the class for an object being restored
+ * cannot be found.
+ */
+ public void readExternal(ObjectInput stream)
+ throws IOException, ClassNotFoundException
+ {
+ mimeType = (MimeType) stream.readObject();
+ String className = null;
+ if (mimeType != null)
+ {
+ humanPresentableName =
+ mimeType.getParameter("humanPresentableName");
+ mimeType.removeParameter("humanPresentableName");
+ className = mimeType.getParameter("class");
+ if (className == null)
+ throw new IOException("No class in mime type");
+ }
+ try
+ {
+ representationClass = (Class) stream.readObject();
+ }
+ catch (OptionalDataException ex)
+ {
+ if (ex.eof && ex.length == 0)
+ {
+ if (className != null)
+ representationClass = tryToLoadClass(className,
+ getClass().getClassLoader());
+ }
+ else
+ throw ex;
+ }
+ }
+
+ /**
+ * Returns a string representation of this DataFlavor. Including the
+ * representation class name, MIME type and human presentable name.
+ */
+ public String toString()
+ {
+ return (getClass().getName()
+ + "[representationClass=" + getRepresentationClass().getName()
+ + ",mimeType=" + getMimeType()
+ + ",humanPresentableName=" + getHumanPresentableName()
+ + "]");
+ }
+
+ /**
+ * XXX - Currently returns <code>java.io.InputStream</code>.
+ *
+ * @since 1.3
+ */
+ public final Class<?> getDefaultRepresentationClass()
+ {
+ return java.io.InputStream.class;
+ }
+
+ /**
+ * XXX - Currently returns <code>java.io.InputStream</code>.
+ */
+ public final String getDefaultRepresentationClassAsString()
+ {
+ return getDefaultRepresentationClass().getName();
+ }
+
+ /**
+ * Creates a <code>Reader</code> for a given <code>Transferable</code>.
+ *
+ * If the representation class is a (subclass of) <code>Reader</code>
+ * then an instance of the representation class is returned. If the
+ * representatation class is a <code>String</code> then a
+ * <code>StringReader</code> is returned. And if the representation class
+ * is a (subclass of) <code>InputStream</code> and the primary MIME type
+ * is "text" then a <code>InputStreamReader</code> for the correct charset
+ * encoding is returned.
+ *
+ * @param transferable The <code>Transferable</code> for which a text
+ * <code>Reader</code> is requested.
+ *
+ * @exception IllegalArgumentException If the representation class is not one
+ * of the seven listed above or the Transferable has null data.
+ * @exception NullPointerException If the Transferable is null.
+ * @exception UnsupportedFlavorException when the transferable doesn't
+ * support this <code>DataFlavor</code>. Or if the representable class
+ * isn't a (subclass of) <code>Reader</code>, <code>String</code>,
+ * <code>InputStream</code> and/or the primary MIME type isn't "text".
+ * @exception IOException when any IOException occurs.
+ * @exception UnsupportedEncodingException if the "charset" isn't supported
+ * on this platform.
+ */
+ public Reader getReaderForText(Transferable transferable)
+ throws UnsupportedFlavorException, IOException
+ {
+ if (!transferable.isDataFlavorSupported(this))
+ throw new UnsupportedFlavorException(this);
+
+ if (Reader.class.isAssignableFrom(representationClass))
+ return (Reader)transferable.getTransferData(this);
+
+ if (String.class.isAssignableFrom(representationClass))
+ return new StringReader((String)transferable.getTransferData(this));
+
+ if (InputStream.class.isAssignableFrom(representationClass)
+ && "text".equals(getPrimaryType()))
+ {
+ InputStream in = (InputStream)transferable.getTransferData(this);
+ String encoding = getParameter("charset");
+ if (encoding == null)
+ encoding = "us-ascii";
+ return new InputStreamReader(in, encoding);
+ }
+
+ throw new UnsupportedFlavorException(this);
+ }
+
+ /**
+ * Returns whether the representation class for this DataFlavor is
+ * @see java.nio.ByteBuffer or a subclass thereof.
+ *
+ * @since 1.4
+ */
+ public boolean isRepresentationClassByteBuffer()
+ {
+ return ByteBuffer.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns whether the representation class for this DataFlavor is
+ * @see java.nio.CharBuffer or a subclass thereof.
+ *
+ * @since 1.4
+ */
+ public boolean isRepresentationClassCharBuffer()
+ {
+ return CharBuffer.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns whether the representation class for this DataFlavor is
+ * @see java.io.Reader or a subclass thereof.
+ *
+ * @since 1.4
+ */
+ public boolean isRepresentationClassReader()
+ {
+ return Reader.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns whether this <code>DataFlavor</code> is a valid text flavor for
+ * this implementation of the Java platform. Only flavors equivalent to
+ * <code>DataFlavor.stringFlavor</code> and <code>DataFlavor</code>s with
+ * a primary MIME type of "text" can be valid text flavors.
+ * <p>
+ * If this flavor supports the charset parameter, it must be equivalent to
+ * <code>DataFlavor.stringFlavor</code>, or its representation must be
+ * <code>java.io.Reader</code>, <code>java.lang.String</code>,
+ * <code>java.nio.CharBuffer</code>, <code>java.io.InputStream</code> or
+ * <code>java.nio.ByteBuffer</code>,
+ * If the representation is <code>java.io.InputStream</code> or
+ * <code>java.nio.ByteBuffer</code>, then this flavor's <code>charset</code>
+ * parameter must be supported by this implementation of the Java platform.
+ * If a charset is not specified, then the platform default charset, which
+ * is always supported, is assumed.
+ * <p>
+ * If this flavor does not support the charset parameter, its
+ * representation must be <code>java.io.InputStream</code>,
+ * <code>java.nio.ByteBuffer</code>.
+ * <p>
+ * See <code>selectBestTextFlavor</code> for a list of text flavors which
+ * support the charset parameter.
+ *
+ * @return <code>true</code> if this <code>DataFlavor</code> is a valid
+ * text flavor as described above; <code>false</code> otherwise
+ * @see #selectBestTextFlavor
+ * @since 1.4
+ */
+ public boolean isFlavorTextType() {
+ // FIXME: I'm not 100% sure if this implementation does the same like sun's does
+ if(equals(DataFlavor.stringFlavor) || getPrimaryType().equals("text"))
+ {
+ String charset = getParameter("charset");
+ Class c = getRepresentationClass();
+ if(charset != null)
+ {
+ if(Reader.class.isAssignableFrom(c)
+ || CharBuffer.class.isAssignableFrom(c)
+ || String.class.isAssignableFrom(c))
+ {
+ return true;
+ }
+ else if(InputStream.class.isAssignableFrom(c)
+ || ByteBuffer.class.isAssignableFrom(c))
+ {
+ return Charset.isSupported(charset);
+ }
+ }
+ else if(InputStream.class.isAssignableFrom(c)
+ || ByteBuffer.class.isAssignableFrom(c))
+ {
+ return true;
+ }
+ }
+ return false;
+ }
+} // class DataFlavor