1 files changed, 66 insertions, 0 deletions
diff --git a/common/src/at/gv/egovernment/moa/util/ResourceBundleChain.java b/common/src/at/gv/egovernment/moa/util/ResourceBundleChain.java
new file mode 100644
index 000000000..90b28548a
--- /dev/null
+++ b/common/src/at/gv/egovernment/moa/util/ResourceBundleChain.java
@@ -0,0 +1,66 @@
+package at.gv.egovernment.moa.util;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
+
+/**
+ * A class to chain <code>ResourceBundle</code>s.
+ * 
+ * @author Patrick Peck
+ * @version $Id$
+ */
+public class ResourceBundleChain {
+  /** Error message indicating the resource is not available. */
+  private static final String ERROR_MISSING_RESOURCE = "Missing resource";
+  /** The <code>ResourceBundle</code>s contained in this chain. */
+  private List resourceBundles = new ArrayList();
+
+  /**
+   * Add a <code>ResourceBundle</code> to the chain.
+   * 
+   * @param resourceBundle The <code>ResourceBundle</code> to add.
+   */
+  public void addResourceBundle(ResourceBundle resourceBundle) {
+    resourceBundles.add(resourceBundle);
+  }
+
+  /**
+   * Return the value of the resource.
+   * 
+   * @param key The key to access the <code>String</code> resource.
+   * @return The resource value. All the registered <code>ResourceBundle</code>s
+   * are searched in the order in which they have previously been added to this
+   * <code>ResourceBundleChain</code>.
+   * @throws MissingResourceException The resource coult not be found in any of
+   * the bundles.
+   */
+  public String getString(String key) throws MissingResourceException {
+    MissingResourceException lastException = null;
+    Iterator iter;
+
+    // handle case where no resource bundles have been added
+    if (resourceBundles.size() == 0) {
+      throw new MissingResourceException(
+        ERROR_MISSING_RESOURCE,
+        this.getClass().getName(),
+        key);
+    }
+
+    // try to find the resource in one of the bundles; if it cannot be found,
+    // return the exception thrown by the last bundle in the list
+    for (iter = resourceBundles.iterator(); iter.hasNext();) {
+      ResourceBundle resourceBundle = (ResourceBundle) iter.next();
+      try {
+        String value = resourceBundle.getString(key);
+        return value;
+      } catch (MissingResourceException e) {
+        lastException = e;
+      }
+    }
+    throw lastException;
+  }
+
+}