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-rw-r--r--common/src/at/gv/egovernment/moa/util/ResourceBundleChain.java66
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
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index 000000000..90b28548a
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+++ 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;
+ }
+
+}