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+/* Identity.java --- Identity Class
+   Copyright (C) 1999, 2003, 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;
+
+import java.io.Serializable;
+import java.util.Vector;
+
+/**
+ * <p>This class represents identities: real-world objects such as people,
+ * companies or organizations whose identities can be authenticated using their
+ * public keys. Identities may also be more abstract (or concrete) constructs,
+ * such as daemon threads or smart cards.</p>
+ *
+ * <p>All Identity objects have a <i>name</i> and a <i>public key</i>. Names
+ * are immutable. <i>Identities</i> may also be <b>scoped</b>. That is, if an
+ * <i>Identity</i> is specified to have a particular <i>scope</i>, then the
+ * <i>name</i> and <i>public key</i> of the <i>Identity</i> are unique within
+ * that <i>scope</i>.</p>
+ *
+ * <p>An <i>Identity</i> also has a <i>set of certificates</i> (all certifying
+ * its own <i>public key</i>). The <i>Principal</i> names specified in these
+ * certificates need not be the same, only the key.</p>
+ *
+ * <p>An <i>Identity</i> can be subclassed, to include postal and email
+ * addresses, telephone numbers, images of faces and logos, and so on.</p>
+ *
+ * @author Mark Benvenuto
+ * @see IdentityScope
+ * @see Signer
+ * @see Principal
+ * @deprecated This class is no longer used. Its functionality has been replaced
+ * by <code>java.security.KeyStore</code>, the <code>java.security.cert</code>
+ * package, and <code>java.security.Principal</code>.
+ */
+public abstract class Identity implements Principal, Serializable
+{
+  private static final long serialVersionUID = 3609922007826600659L;
+
+  private String name;
+  private IdentityScope scope;
+  private PublicKey publicKey;
+  private String info;
+  private Vector certificates;
+
+  /** Constructor for serialization only. */
+  protected Identity()
+  {
+  }
+
+  /**
+   * Constructs an identity with the specified name and scope.
+   *
+   * @param name the identity name.
+   * @param scope the scope of the identity.
+   * @throws KeyManagementException if there is already an identity with the
+   * same name in the scope.
+   */
+  public Identity(String name, IdentityScope scope)
+    throws KeyManagementException
+  {
+    this.name = name;
+    this.scope = scope;
+  }
+
+  /**
+   * Constructs an identity with the specified name and no scope.
+   *
+   * @param name the identity name.
+   */
+  public Identity(String name)
+  {
+    this.name = name;
+    this.scope = null;
+  }
+
+  /**
+   * Returns this identity's name.
+   *
+   * @return the name of this identity.
+   */
+  public final String getName()
+  {
+    return name;
+  }
+
+  /**
+   * Returns this identity's scope.
+   *
+   * @return the scope of this identity.
+   */
+  public final IdentityScope getScope()
+  {
+    return scope;
+  }
+
+  /**
+   * Returns this identity's public key.
+   *
+   * @return the public key for this identity.
+   * @see #setPublicKey(java.security.PublicKey)
+   */
+  public PublicKey getPublicKey()
+  {
+    return publicKey;
+  }
+
+  /**
+   * <p>Sets this identity's public key. The old key and all of this identity's
+   * certificates are removed by this operation.</p>
+   *
+   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
+   * </code> method is called with <code>"setIdentityPublicKey"</code> as its
+   * argument to see if it's ok to set the public key.</p>
+   *
+   * @param key the public key for this identity.
+   * @throws KeyManagementException if another identity in the identity's scope
+   * has the same public key, or if another exception occurs.
+   * @throws SecurityException if a security manager exists and its
+   * <code>checkSecurityAccess()</code> method doesn't allow setting the public
+   * key.
+   * @see #getPublicKey()
+   * @see SecurityManager#checkSecurityAccess(String)
+   */
+  public void setPublicKey(PublicKey key) throws KeyManagementException
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkSecurityAccess("setIdentityPublicKey");
+
+    this.publicKey = key;
+  }
+
+  /**
+   * <p>Specifies a general information string for this identity.</p>
+   *
+   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
+   * </code> method is called with <code>"setIdentityInfo"</code> as its
+   * argument to see if it's ok to specify the information string.</p>
+   *
+   * @param info the information string.
+   * @throws SecurityException if a security manager exists and its
+   * <code>checkSecurityAccess()</code> method doesn't allow setting the
+   * information string.
+   * @see #getInfo()
+   * @see SecurityManager#checkSecurityAccess(String)
+   */
+  public void setInfo(String info)
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkSecurityAccess("setIdentityInfo");
+
+    this.info = info;
+  }
+
+  /**
+   * Returns general information previously specified for this identity.
+   *
+   * @return general information about this identity.
+   * @see #setInfo(String)
+   */
+  public String getInfo()
+  {
+    return info;
+  }
+
+  /**
+   * <p>Adds a certificate for this identity. If the identity has a public key,
+   * the public key in the certificate must be the same, and if the identity
+   * does not have a public key, the identity's public key is set to be that
+   * specified in the certificate.</p>
+   *
+   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
+   * </code> method is called with <code>"addIdentityCertificate"</code> as its
+   * argument to see if it's ok to add a certificate.</p>
+   *
+   * @param certificate the certificate to be added.
+   * @throws KeyManagementException if the certificate is not valid, if the
+   * public key in the certificate being added conflicts with this identity's
+   * public key, or if another exception occurs.
+   * @throws SecurityException if a security manager exists and its
+   * <code>checkSecurityAccess()</code> method doesn't allow adding a
+   * certificate.
+   * @see SecurityManager#checkSecurityAccess(String)
+   */
+  public void addCertificate(Certificate certificate)
+    throws KeyManagementException
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkSecurityAccess("addIdentityCertificate");
+
+    // Check public key of this certificate against the first one in the vector
+    if (certificates.size() > 0)
+      {
+	if (((Certificate) certificates.firstElement()).getPublicKey() != publicKey)
+	  throw new KeyManagementException("Public key does not match");
+      }
+    certificates.addElement(certificate);
+  }
+
+  /**
+   * <p>Removes a certificate from this identity.</p>
+   *
+   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
+   * </code> method is called with <code>"removeIdentityCertificate"</code> as
+   * its argument to see if it's ok to remove a certificate.</p>
+   *
+   * @param certificate the certificate to be removed.
+   * @throws KeyManagementException if the certificate is missing, or if
+   * another exception occurs.
+   * @throws SecurityException if a security manager exists and its
+   * <code>checkSecurityAccess()</code> method doesn't allow removing a
+   * certificate.
+   * @see SecurityManager#checkSecurityAccess(String)
+   */
+  public void removeCertificate(Certificate certificate)
+    throws KeyManagementException
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkSecurityAccess("removeIdentityCertificate");
+
+    if (certificates.contains(certificate) == false)
+      throw new KeyManagementException("Certificate not found");
+
+    certificates.removeElement(certificate);
+  }
+
+  /**
+   * Returns a copy of all the certificates for this identity.
+   *
+   * @return a copy of all the certificates for this identity.
+   */
+  public Certificate[] certificates()
+  {
+    Certificate[] certs = new Certificate[certificates.size()];
+    int max = certificates.size();
+    for (int i = 0; i < max; i++)
+      certs[i] = (Certificate) certificates.elementAt(i);
+
+    return certs;
+  }
+
+  /**
+   * Tests for equality between the specified object and this identity. This
+   * first tests to see if the entities actually refer to the same object, in
+   * which case it returns <code>true</code>. Next, it checks to see if the
+   * entities have the same <i>name</i> and the same <i>scope</i>. If they do,
+   * the method returns <code>true</code>. Otherwise, it calls
+   * <code>identityEquals()</code>, which subclasses should override.
+   *
+   * @param identity the object to test for equality with this identity.
+   * @return <code>true</code> if the objects are considered equal, <code>false
+   * </code>otherwise.
+   * @see #identityEquals(Identity)
+   */
+  public final boolean equals(Object identity)
+  {
+    if (identity instanceof Identity)
+      {
+	if (identity == this)
+	  return true;
+
+	if ((((Identity) identity).getName() == this.name) &&
+	    (((Identity) identity).getScope() == this.scope))
+	  return true;
+
+	return identityEquals((Identity) identity);
+      }
+    return false;
+  }
+
+  /**
+   * Tests for equality between the specified <code>identity</code> and this
+   * <i>identity</i>. This method should be overriden by subclasses to test for
+   * equality. The default behavior is to return <code>true</code> if the names
+   * and public keys are equal.
+   *
+   * @param identity the identity to test for equality with this identity.
+   * @return <code>true</code> if the identities are considered equal,
+   * <code>false</code> otherwise.
+   * @see #equals(Object)
+   */
+  protected boolean identityEquals(Identity identity)
+  {
+    return ((identity.getName() == this.name) &&
+	    (identity.getPublicKey() == this.publicKey));
+  }
+
+  /**
+   * <p>Returns a short string describing this identity, telling its name and
+   * its scope (if any).</p>
+   *
+   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
+   * </code> method is called with <code>"printIdentity"</code> as its argument
+   * to see if it's ok to return the string.</p>
+   *
+   * @return information about this identity, such as its name and the name of
+   * its scope (if any).
+   * @throws SecurityException if a security manager exists and its
+   * <code>checkSecurityAccess()</code> method doesn't allow returning a string
+   * describing this identity.
+   * @see SecurityManager#checkSecurityAccess(String)
+   */
+  public String toString()
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkSecurityAccess("printIdentity");
+
+    /* TODO: Insert proper format here */
+    return (name + ":@" + scope + " Public Key: " + publicKey);
+  }
+
+  /**
+   * <p>Returns a string representation of this identity, with optionally more
+   * details than that provided by the <code>toString()</code> method without
+   * any arguments.</p>
+   *
+   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
+   * </code> method is called with <code>"printIdentity"</code> as its argument
+   * to see if it's ok to return the string.</p>
+   *
+   * @param detailed whether or not to provide detailed information.
+   * @return information about this identity. If detailed is <code>true</code>,
+   * then this method returns more information than that provided by the
+   * <code>toString()</code> method without any arguments.
+   * @throws SecurityException if a security manager exists and its
+   * <code>checkSecurityAccess()</code> method doesn't allow returning a string
+   * describing this identity.
+   * @see #toString()
+   * @see SecurityManager#checkSecurityAccess(String)
+   */
+  public String toString(boolean detailed)
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkSecurityAccess("printIdentity");
+
+    if (detailed)
+      {
+	/* TODO: Insert proper detailed format here */
+	return (name + ":@" + scope + " Public Key: " + publicKey);
+      }
+    else
+      {
+	/* TODO: Insert proper format here */
+	return (name + ":@" + scope + " Public Key: " + publicKey);
+      }
+  }
+
+  /**
+   * Returns a hashcode for this identity.
+   *
+   * @return a hashcode for this identity.
+   */
+  public int hashCode()
+  {
+    int ret = name.hashCode();
+    if (publicKey != null)
+      ret |= publicKey.hashCode();
+    if (scope != null)
+      ret |= scope.hashCode();
+    if (info != null)
+      ret |= info.hashCode();
+    if (certificates != null)
+      ret |= certificates.hashCode();
+
+    return ret;
+  }
+}