Restructured the project creating a router directory for the router bundle implementa...

[xmlrouter] / router / impl / src / main / java / org / wamblee / xmlrouter / impl / RobustFilter.java

diff --git a/router/impl/src/main/java/org/wamblee/xmlrouter/impl/RobustFilter.java b/router/impl/src/main/java/org/wamblee/xmlrouter/impl/RobustFilter.java
new file mode 100644 (file)
index 0000000..625f894
--- /dev/null
+++ b/router/impl/src/main/java/org/wamblee/xmlrouter/impl/RobustFilter.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2005-2011 the original author or authors.
+ * 
+ * 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 org.wamblee.xmlrouter.impl;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.xml.transform.dom.DOMSource;
+
+import org.wamblee.xmlrouter.config.Filter;
+
+/**
+ * This class provides robustness towards externally supplied filters.
+ * 
+ * @author Erik Brakkee
+ * 
+ */
+public class RobustFilter extends RobustIdentifiable<Filter> implements Filter {
+
+    private static final Logger LOGGER = Logger.getLogger(RobustFilter.class
+        .getName());
+
+    private Filter filter;
+
+    /**
+     * Constructs the wrapper.
+     * 
+     * @param aId
+     *            Id.
+     * @param aFilter
+     *            Filter to wrap.
+     */
+    public RobustFilter(String aPrefix, Filter aFilter) {
+        super(aFilter);
+        filter = aFilter;
+    }
+
+    @Override
+    public boolean isAllowed(String aDocumentType, DOMSource aSource) {
+        try {
+            return filter.isAllowed(aDocumentType, aSource);
+        } catch (Exception e) {
+            LOGGER.log(Level.WARNING, "Filter " + getId() +
+                " threw exception, assuming filter returns true", e);
+            return true;
+        }
+    }
+}