From 32d17447a258188b2d534bcb0bf65a659ba7b7d0 Mon Sep 17 00:00:00 2001
From: mcentner <mcentner@8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4>
Date: Fri, 29 Aug 2008 12:11:34 +0000
Subject: Initial import.

git-svn-id: https://joinup.ec.europa.eu/svn/mocca/trunk@1 8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4
---
 .../java/at/gv/egiz/bku/binding/IdFactory.java     | 106 +++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 bkucommon/src/main/java/at/gv/egiz/bku/binding/IdFactory.java

(limited to 'bkucommon/src/main/java/at/gv/egiz/bku/binding/IdFactory.java')

diff --git a/bkucommon/src/main/java/at/gv/egiz/bku/binding/IdFactory.java b/bkucommon/src/main/java/at/gv/egiz/bku/binding/IdFactory.java
new file mode 100644
index 00000000..60bf69a4
--- /dev/null
+++ b/bkucommon/src/main/java/at/gv/egiz/bku/binding/IdFactory.java
@@ -0,0 +1,106 @@
+/*
+* Copyright 2008 Federal Chancellery Austria and
+* Graz University of Technology
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+package at.gv.egiz.bku.binding;
+
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * Creates or converts Ids for BindingProcessors.
+ * @author wbauer
+ *
+ */
+public class IdFactory {
+
+  public static int DEFAULT_NUMBER_OF_BITS = 168;
+
+  private static Log log = LogFactory.getLog(IdFactory.class);
+
+  private static IdFactory instance = new IdFactory();
+
+  private SecureRandom random;
+  private int numberOfBits = DEFAULT_NUMBER_OF_BITS;
+
+  private IdFactory() {
+    try {
+      random = SecureRandom.getInstance("SHA1PRNG");
+    } catch (NoSuchAlgorithmException e) {
+      log.error("Cannot instantiate secure random" + e);
+    }
+  }
+
+  public static IdFactory getInstance() {
+    return instance;
+  }
+
+
+  /**
+   * set the secure random number generator to create secure ids.
+   * 
+   * @param random
+   *          must not be null
+   */
+  public void setSecureRandom(SecureRandom random) {
+    if (random == null) {
+      throw new NullPointerException("Cannot set secure random to null");
+    }
+    this.random = random;
+  }
+
+  /**
+   * Don't use this method unless you know exactly what you do !
+   * Be sure to use a sufficient large entropy 
+   * @param numberOfBits >=1 (although this small entropy does not make sense)
+   */
+  public void setNumberOfBits(int numberOfBits) {
+    if (numberOfBits <1) {
+      throw new IllegalArgumentException("Cannot set number of bits < 1");
+    }
+    this.numberOfBits = numberOfBits;
+  }
+
+  public int getNumberOfBits() {
+    return numberOfBits;
+  }
+  
+  /**
+   * Creates a new Id object with the factory's secure RNG and the set number of
+   * bits.
+   * 
+   * @return
+   */
+  public Id createId() {
+    return new IdImpl(numberOfBits, random);
+  }
+
+  /**
+   * Creates an Id object for the provided String
+   * 
+   * @param idString
+   *          may be null in this case the method call creates a new Id.
+   * @return
+   */
+  public Id createId(String idString) {
+    if (idString == null) {
+      return createId();
+    }
+    return new IdImpl(idString);
+  }
+}
\ No newline at end of file
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