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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/MimeType.java
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+/* MimeType.java -- A helper class for mime handling in DataFlavor
+ Copyright (C) 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 gnu.java.lang.CPStringBuilder;
+
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.Set;
+import java.util.StringTokenizer;
+
+/**
+ * A helper class for mime handling in DataFlavor.
+ *
+ * A Mauve test for DataFlavor.writeExternal() shows that a non-public
+ * class java.awt.datatransfer.MimeType gets serialized. This class
+ * is mainly here for serialization compatibility. Of course,
+ * now that we have it here, we can just as well implement some
+ * mime handling facility here.
+ */
+class MimeType
+ implements Externalizable
+{
+
+ /**
+ * The primary type.
+ */
+ private String primaryType;
+
+ /**
+ * The subtype.
+ */
+ private String subType;
+
+ /**
+ * Additional parameters to be appended to the mime string.
+ */
+ private HashMap parameters;
+
+ /**
+ * This is only here for deserialization.
+ */
+ public MimeType()
+ {
+ parameters = new HashMap();
+ }
+
+ /**
+ * Creates a new MimeType object.
+ *
+ * @param mime the mime type
+ */
+ MimeType(String mime)
+ throws MimeTypeParseException
+ {
+ this();
+ parse(mime);
+ }
+
+ /**
+ * Adds a mime parameter.
+ *
+ * @param param the parameter key
+ * @param value the parameter value
+ */
+ void addParameter(String param, String value)
+ {
+ parameters.put(param, value);
+ }
+
+ /**
+ * Removes the parameter with the specified key.
+ *
+ * @param param the parameter to remove
+ */
+ void removeParameter(String param)
+ {
+ parameters.remove(param);
+ }
+
+ /**
+ * Returns the parameter for the <code>key</code>.
+ *
+ * @param key the parameter key
+ *
+ * @return the parameter for the <code>key</code>
+ */
+ String getParameter(String key)
+ {
+ return (String) parameters.get(key);
+ }
+
+ /**
+ * Returns the primary type.
+ *
+ * @return the primary type
+ */
+ String getPrimaryType()
+ {
+ return primaryType;
+ }
+
+ String getSubType()
+ {
+ return subType;
+ }
+
+ /**
+ * Returns the base type of this mime type. This is the primary
+ * type plus the subtype, separated by '/'.
+ *
+ * @return the base type of this mime type
+ */
+ String getBaseType()
+ {
+ return primaryType + '/' + subType;
+ }
+
+ /**
+ * Returns <code>true</code> if this mime type and another mime type
+ * match. This will be true when their primary types are equal, and their
+ * subtypes are equal (or when either subtype is * ).
+ *
+ * @param other the other mime type
+ *
+ * @return <code>true</code> if the mime types match, <code>false</code>
+ * otherwise
+ */
+ boolean matches(MimeType other)
+ {
+ boolean match = false;
+ if (other != null)
+ {
+ match = primaryType.equals(other.primaryType)
+ && (subType.equals("*") || other.subType.equals("*")
+ || subType.equals(other.subType));
+ }
+ return match;
+ }
+
+ /**
+ * Serializes the mime type.
+ *
+ * @param in the input stream to read from
+ *
+ * @throws ClassNotFoundException not thrown here
+ * @throws IOException when something goes wrong on the input stream,
+ * or when the mime type can't be parsed
+ */
+ public void readExternal(ObjectInput in)
+ throws ClassNotFoundException, IOException
+ {
+ String mime = in.readUTF();
+ parameters.clear();
+ try
+ {
+ parse(mime);
+ }
+ catch (MimeTypeParseException ex)
+ {
+ IOException ioEx = new IOException();
+ ioEx.initCause(ex);
+ throw ioEx;
+ }
+ }
+
+ /**
+ * Serializes this mime type.
+ *
+ * @param out the output stream
+ *
+ * @throws IOException when something goes wrong on the output stream
+ */
+ public void writeExternal(ObjectOutput out)
+ throws IOException
+ {
+ out.writeUTF(toString());
+ }
+
+ /**
+ * Creates a string representation of this mime type.
+ *
+ * @return a string representation of this mime type
+ */
+ public String toString()
+ {
+ CPStringBuilder s = new CPStringBuilder();
+ s.append(primaryType);
+ s.append('/');
+ s.append(subType);
+ if (parameters.size() > 0)
+ {
+ Set entries = parameters.entrySet();
+ for (Iterator i = entries.iterator(); i.hasNext();)
+ {
+ s.append("; ");
+ Map.Entry entry = (Map.Entry) i.next();
+ s.append(entry.getKey());
+ s.append('=');
+ s.append(entry.getValue());
+ }
+ }
+ return s.toString();
+ }
+
+ /**
+ * Parses the specified mime type string and initializes the fields
+ * of this object.
+ *
+ * @param mime the mime type string
+ */
+ private void parse(String mime)
+ throws MimeTypeParseException
+ {
+ // FIXME: Maybe implement more sophisticated mime string parsing according
+ // to RFC 2045 and 2046.
+ StringTokenizer tokenizer = new StringTokenizer(mime);
+ try
+ {
+ primaryType = tokenizer.nextToken("/");
+ subType = tokenizer.nextToken("/;");
+ }
+ catch (NoSuchElementException ex)
+ {
+ throw new MimeTypeParseException("Expected / separator");
+ }
+
+ // Add any parameters.
+ while (tokenizer.hasMoreTokens())
+ {
+ String keyValuePair = tokenizer.nextToken(";");
+ int i = keyValuePair.indexOf('=');
+ if (i == -1)
+ throw new MimeTypeParseException("Expected = as parameter separator");
+ String key = keyValuePair.substring(0, i).trim();
+ String value = keyValuePair.substring(i + 1).trim();
+ parameters.put(key, value);
+ }
+ }
+
+}