initial versions.

[xmlrouter] / config / src / main / java / org / wamblee / xmlrouter / config / Rule.java

diff --git a/config/src/main/java/org/wamblee/xmlrouter/config/Rule.java b/config/src/main/java/org/wamblee/xmlrouter/config/Rule.java
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+++ b/config/src/main/java/org/wamblee/xmlrouter/config/Rule.java
@@ -0,0 +1,62 @@
+/*
+ * 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.config;
+
+import org.wamblee.xml.XMLDocument;
+import org.wamblee.xml.XMLException;
+import org.wamblee.xml.XMLProcessor;
+import org.wamblee.xml.XPathExpression;
+
+/**
+ * Basic rule for XML routing. 
+ * 
+ * @author Erik Brakkee
+ */
+public class Rule {
+     
+    private XPathExpression condition; 
+    private XMLProcessor processor; 
+    private String destination; 
+
+    /**
+     * Constructs the rule. 
+     * @param aCondition Condition to be satisfied. 
+     * @param aProcessor XML Processor to be applied when the condition is valid. 
+     * @param aDestination Destination for the result of this rule. 
+     */
+    public Rule(XPathExpression aCondition, XMLProcessor aProcessor, String aDestination) {
+        condition = aCondition;
+        processor = aProcessor;
+        destination = aDestination;
+    }
+    
+    /**
+     * Applies the rule to a document. 
+     * @param aDocument Document to apply rule ot. 
+     * @return Transformed document or null if the rule did not apply. 
+     * @throws XMLException In case the application of the rule gives an error. 
+     */
+    public XMLDocument apply(XMLDocument aDocument) throws XMLException {
+        if ( !condition.booleanEval(aDocument)) { 
+            return null; 
+        }
+        return aDocument.process(processor); 
+    }
+    
+    public String getDestination() {
+        return destination;
+    }
+}