Initial revision

From-SVN: r102074

1 files changed, 252 insertions, 0 deletions

diff --git a/libjava/classpath/java/security/cert/CertPath.java b/libjava/classpath/java/security/cert/CertPath.java
new file mode 100644
index 0000000..e818763
--- /dev/null
+++ b/libjava/classpath/java/security/cert/CertPath.java
@@ -0,0 +1,252 @@
+/* CertPath.java -- a sequence of certificates
+   Copyright (C) 2002, 2005  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.security.cert;
+
+import java.io.ByteArrayInputStream;
+import java.io.NotSerializableException;
+import java.io.ObjectStreamException;
+import java.io.Serializable;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * This class represents an immutable sequence, or path, of security
+ * certificates. The path type must match the type of each certificate in the
+ * path, or in other words, for all instances of cert in a certpath object,
+ * <code>cert.getType().equals(certpath.getType())</code> will return true.
+ *
+ * <p>Since this class is immutable, it is thread-safe. During serialization,
+ * the path is consolidated into a {@link CertPathRep}, which preserves the
+ * data regardless of the underlying implementation of the path.
+ *
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @since 1.4
+ * @status updated to 1.4
+ */
+public abstract class CertPath implements Serializable
+{
+  /**
+   * The serialized representation of a path.
+   *
+   * @author Eric Blake (ebb9@email.byu.edu)
+   */
+  protected static class CertPathRep implements Serializable
+  {
+    /**
+     * Compatible with JDK 1.4+.
+     */
+    private static final long serialVersionUID = 3015633072427920915L;
+
+    /**
+     * The certificate type.
+     *
+     * @serial the type of the certificate path
+     */
+    private final String type;
+
+    /**
+     * The encoded form of the path.
+     *
+     * @serial the encoded form
+     */
+    private final byte[] data;
+
+    /**
+     * Create the new serial representation.
+     *
+     * @param type the path type
+     * @param data the encoded path data
+     */
+    protected CertPathRep(String type, byte[] data)
+    {
+      this.type = type;
+      this.data = data;
+    }
+
+    /**
+     * Decode the data into an actual {@link CertPath} upon deserialization.
+     *
+     * @return the replacement object
+     * @throws ObjectStreamException if replacement fails
+     */
+    protected Object readResolve() throws ObjectStreamException
+    {
+      try
+        {
+          return CertificateFactory.getInstance(type)
+            .generateCertPath(new ByteArrayInputStream(data));
+        }
+      catch (CertificateException e)
+        {
+          throw (ObjectStreamException)
+            new NotSerializableException("java.security.cert.CertPath: "
+                                         + type).initCause(e);
+        }
+    }
+  } // class CertPathRep
+
+  /**
+   * Compatible with JDK 1.4+.
+   */
+  private static final long serialVersionUID = 6068470306649138683L;
+
+  /**
+   * The path type.
+   *
+   * @serial the type of all certificates in this path
+   */
+  private final String type;
+
+  /**
+   * Create a certificate path with the given type. Most code should use
+   * {@link CertificateFactory} to create CertPaths.
+   *
+   * @param type the type of the path
+   */
+  protected CertPath(String type)
+  {
+    this.type = type;
+  }
+
+  /**
+   * Get the (non-null) type of all certificates in the path.
+   *
+   * @return the path certificate type
+   */
+  public String getType()
+  {
+    return type;
+  }
+
+  /**
+   * Get an immutable iterator over the path encodings (all String names),
+   * starting with the default encoding. The iterator will throw an
+   * <code>UnsupportedOperationException</code> if an attempt is made to
+   * remove items from the list.
+   *
+   * @return the iterator of supported encodings in the path
+   */
+  public abstract Iterator getEncodings();
+
+  /**
+   * Compares this path to another for semantic equality. To be equal, both
+   * must be instances of CertPath, with the same type, and identical
+   * certificate lists. Overriding classes must not change this behavior.
+   *
+   * @param o the object to compare to
+   * @return true if the two are equal
+   */
+  public boolean equals(Object o)
+  {
+    if (! (o instanceof CertPath))
+      return false;
+    CertPath cp = (CertPath) o;
+    return type.equals(cp.type)
+      && getCertificates().equals(cp.getCertificates());
+  }
+
+  /**
+   * Returns the hashcode of this certificate path. This is defined as:<br>
+   * <code>31 * getType().hashCode() + getCertificates().hashCode()</code>.
+   *
+   * @return the hashcode
+   */
+  public int hashCode()
+  {
+    return 31 * type.hashCode() + getCertificates().hashCode();
+  }
+
+  public String toString()
+  {
+    List l = getCertificates();
+    int size = l.size();
+    int i = 0;
+    StringBuffer result = new StringBuffer(type);
+    result.append(" Cert Path: length = ").append(size).append(".\n[\n");
+    while (--size >= 0)
+      result.append(l.get(i++)).append('\n');
+    return result.append("\n]").toString();
+  }
+
+  /**
+   * Returns the encoded form of this path, via the default encoding.
+   *
+   * @return the encoded form
+   * @throws CertificateEncodingException if encoding fails
+   */
+  public abstract byte[] getEncoded() throws CertificateEncodingException;
+
+  /**
+   * Returns the encoded form of this path, via the specified encoding.
+   *
+   * @param encoding the encoding to use
+   * @return the encoded form
+   * @throws CertificateEncodingException if encoding fails or does not exist
+   */
+  public abstract byte[] getEncoded(String encoding)
+    throws CertificateEncodingException;
+
+  /**
+   * Returns the immutable, thread-safe list of certificates in this path.
+   *
+   * @return the list of certificates, non-null but possibly empty
+   */
+  public abstract List getCertificates();
+
+  /**
+   * Serializes the path in its encoded form, to ensure reserialization with
+   * the appropriate factory object without worrying about list implementation.
+   * The result will always be an instance of {@link CertPathRep}.
+   *
+   * @return the replacement object
+   * @throws ObjectStreamException if the replacement creation fails
+   */
+  protected Object writeReplace() throws ObjectStreamException
+  {
+    try
+      {
+        return new CertPathRep(type, getEncoded());
+      }
+    catch (CertificateEncodingException e)
+      {
+        throw (ObjectStreamException)
+          new NotSerializableException("java.security.cert.CertPath: "
+                                       + type).initCause(e);
+      }
+  }
+} // class CertPath