1 files changed, 178 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/keyring/Entry.java b/libjava/classpath/gnu/javax/crypto/keyring/Entry.java
new file mode 100644
index 00000000000..fa7f496798b
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+++ b/libjava/classpath/gnu/javax/crypto/keyring/Entry.java
@@ -0,0 +1,178 @@
+/* Entry.java -- 
+   Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+
+This file is a 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 of the License, 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; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, 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 gnu.javax.crypto.keyring;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+/**
+ * An immutable class representing a single entry in a keyring.
+ */
+public abstract class Entry
+{
+
+  // Fields.
+  // ------------------------------------------------------------------------
+
+  /** This entry's type identifier. */
+  protected int type;
+
+  /** This entry's property set. */
+  protected Properties properties;
+
+  /** This entry's payload. */
+  protected byte[] payload;
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Creates a new Entry.
+   *
+   * @param type This entry's type.
+   * @param properties This entry's properties.
+   * @throws IllegalArgumentException If the properties argument is null,
+   *   or if the type is out of range.
+   */
+  protected Entry(int type, Properties properties)
+  {
+    if (type < 0 || type > 255)
+      {
+        throw new IllegalArgumentException("invalid packet type");
+      }
+    if (properties == null)
+      {
+        throw new IllegalArgumentException("no properties");
+      }
+    this.type = type;
+    this.properties = (Properties) properties.clone();
+  }
+
+  /**
+   * Constructor for use by subclasses.
+   */
+  protected Entry(final int type)
+  {
+    if (type < 0 || type > 255)
+      {
+        throw new IllegalArgumentException("invalid packet type");
+      }
+    this.type = type;
+    properties = new Properties();
+  }
+
+  // Instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Returns this entry's properties object. The properties are cloned before
+   * being returned.
+   *
+   * @return The properties.
+   */
+  public Properties getProperties()
+  {
+    return (Properties) properties.clone();
+  }
+
+  /**
+   * Returns this entry's payload data, or null if
+   */
+  public byte[] getPayload()
+  {
+    if (payload == null)
+      return null;
+    return (byte[]) payload.clone();
+  }
+
+  /**
+   * This method is called when this entry needs to be written to an
+   * output stream.
+   *
+   * @param out The stream to write to.
+   * @throws IOException If an I/O exception occurs.
+   */
+  public void encode(DataOutputStream out) throws IOException
+  {
+    if (payload == null)
+      {
+        encodePayload();
+      }
+    if (out == null)
+      {
+        return;
+      }
+    out.write(type);
+    properties.encode(out);
+    out.writeInt(payload.length);
+    out.write(payload);
+  }
+
+  /**
+   * Generic decoding method, which simply decodes the properties field
+   * and reads the payload field.
+   *
+   * @param in The input data stream.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected void defaultDecode(DataInputStream in) throws IOException
+  {
+    properties = new Properties();
+    properties.decode(in);
+    int len = in.readInt();
+    if (len < 0)
+      {
+        throw new IOException("corrupt length");
+      }
+    payload = new byte[len];
+    in.readFully(payload);
+  }
+
+  // Abstract methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * This method is called of subclasses when the payload data needs to be
+   * created.
+   *
+   * @throws IOException If an encoding error occurs.
+   */
+  protected abstract void encodePayload() throws IOException;
+}