initial list of mime-type bindings to jalview data-file classes for JAL-719

diff --git a/src/jalview/io/mime/MimeTypes.java b/src/jalview/io/mime/MimeTypes.java
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+++ b/src/jalview/io/mime/MimeTypes.java
@@ -0,0 +1,61 @@
+package jalview.io.mime;
+
+import jalview.io.packed.DataProvider.JvDataType;
+
+/**
+ * static functions for resolving Jalview datatypes from mime types 
+ * @author JimP
+ * TODO: consider making get(Mime)TypeOf functions throw exceptions rather than returning null
+ */
+public class MimeTypes
+{
+  /**
+   * pair list {String,JvDataType} giving a mime-type followed by its associated JvDataType enumeration.
+   */
+  final public static Object[] typemap = new Object[] {
+    "application/x-align",JvDataType.ALIGNMENT,
+    "application/x-jalview-annotation",JvDataType.ANNOTATION,
+    "application/x-newick",JvDataType.TREE,
+    "application/x-new-hampshire",JvDataType.TREE,
+    "application/x-new-hampshire-extended",JvDataType.TREE,
+    "application/x-nh",JvDataType.TREE,
+    "application/x-nhx",JvDataType.TREE,
+    "application/x-gff",JvDataType.FEATURES,
+    "application/x-gff3",JvDataType.FEATURES,
+    "application/x-jalview-feature-file",JvDataType.FEATURES,
+    "application/x-pdb",JvDataType.SEQASSOCATED};
+  /**
+   * 
+   * @param mimeType
+   * @return the associated jalview datatype or null if no mapping is available
+   */
+  public static JvDataType getTypeOf(String mimeType)
+  {
+    String mt = mimeType.toLowerCase();
+    for (int i=0;i<typemap.length;i+=2)
+    {
+      if (typemap[i].equals(mt))
+      {
+        return (JvDataType) typemap[i+1];
+      }
+    }
+    return null;
+  }
+  
+  /**
+   * 
+   * @param type
+   * @return the primary mimetype associated with this type.
+   */
+  public static String getMimeTypeOf(JvDataType type)
+  {
+    for (int i=1;i<typemap.length;i+=2)
+    {
+      if (typemap[i].equals(type))
+      {
+        return (String) typemap[i-1];
+      }
+    }
+    return null;
+  }
+}
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