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
---
 .../slcommands/impl/xsect/IdValueFactoryImpl.java  | 127 +++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/IdValueFactoryImpl.java

(limited to 'bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/IdValueFactoryImpl.java')

diff --git a/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/IdValueFactoryImpl.java b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/IdValueFactoryImpl.java
new file mode 100644
index 00000000..b9824655
--- /dev/null
+++ b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/IdValueFactoryImpl.java
@@ -0,0 +1,127 @@
+/*
+* 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.slcommands.impl.xsect;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Random;
+
+/**
+ * An implementation of the IdValueFactory.
+ * <p>
+ * This IdValueFactory creates <code>xsd:Id</code>-attribute values of the form
+ * '<code>&lt;elementName&gt;-&lt;random&gt;-&lt;sequenceNumber&gt;</code>',
+ * where
+ * <ul>
+ * <li><code>&lt;elementName&gt;</code> is the name provided at
+ * {@link #createIdValue(String)},</li>
+ * <li><code>&lt;random&gt;</code> is a random generated fixed value for an
+ * instance of this IdValueFactory and</li>
+ * <li><code>&lt;sequenceNumber&gt;</code> is the sequence number of the value
+ * generated for a given <code>elementName</code> by an instance of this
+ * IdValueFactory.</li>
+ * </ul>
+ * </p>
+ * 
+ * @author mcentner
+ */
+public class IdValueFactoryImpl implements IdValueFactory {
+
+  /**
+   * A generator for <code>xsd:Id</code>-attribute values.
+   * 
+   * @author mcentner
+   */
+  private class IdGenerator {
+
+    /**
+     * The salt.
+     */
+    private String salt;
+
+    /**
+     * The element name.
+     */
+    private String elementName;
+
+    /**
+     * The sequence number.
+     */
+    private int i = 0;
+
+    /**
+     * Creates a new instance of this IdGenerator with the given
+     * <code>elementName</code> and <code>salt</code> value.
+     * 
+     * @param elementName the element name
+     * @param salt the salt valeu
+     */
+    private IdGenerator(String elementName, String salt) {
+      super();
+      this.elementName = elementName;
+      this.salt = salt;
+    }
+
+    /**
+     * @return returns the next <code>xsd:Id</code>-attribute value.
+     */
+    public String getNextId() {
+      return elementName + "-" + salt + "-" + Integer.toString(++i);
+    }
+
+  }
+
+  /**
+   * A map of element names to <code>xsd:Id</code>-value generators.
+   */
+  private Map<String, IdGenerator> generators = new HashMap<String, IdGenerator>();
+
+  /**
+   * The seed value.
+   */
+  private String seed;
+
+  /**
+   * Creates a new instance of this IdValueFactory.
+   */
+  public IdValueFactoryImpl() {
+
+    Random random = new Random();
+    int rand = random.nextInt();
+    seed = Integer.toHexString(rand);
+
+  }
+
+  /*
+   * (non-Javadoc)
+   * 
+   * @see
+   * at.gv.egiz.bku.slcommands.impl.IdValueFactory#createIdValue(java.lang.String
+   * )
+   */
+  public String createIdValue(String elementName) {
+
+    IdGenerator generator = generators.get(elementName);
+    if (generator == null) {
+      generator = new IdGenerator(elementName, seed);
+      generators.put(elementName, generator);
+    }
+    return generator.getNextId();
+
+  }
+
+}
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