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

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

diff --git a/router/impl/src/main/java/org/wamblee/xmlrouter/impl/TransformationPath.java b/router/impl/src/main/java/org/wamblee/xmlrouter/impl/TransformationPath.java
new file mode 100644 (file)
index 0000000..230c7fc
--- /dev/null
+++ b/router/impl/src/main/java/org/wamblee/xmlrouter/impl/TransformationPath.java
@@ -0,0 +1,136 @@
+/*
+ * 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.ArrayList;
+import java.util.List;
+
+import org.wamblee.xmlrouter.config.Transformation;
+
+/**
+ * Transformation path from a source document to a destination.
+ * 
+ * @author Erik Brakkee
+ * 
+ */
+public class TransformationPath {
+
+    private List<Transformation> transformations;
+
+    /**
+     * Constructs empty path.
+     */
+    public TransformationPath() {
+        transformations = new ArrayList<Transformation>();
+    }
+
+    /**
+     * Constructs path with single transformation.
+     * 
+     * @param aTransformation
+     *            Single transformation.
+     */
+    public TransformationPath(Transformation aTransformation) {
+        this();
+        transformations.add(aTransformation);
+    }
+
+    /**
+     * Constructs path with list of transformations.
+     * 
+     * @param aTransformations
+     *            List of transformations.
+     */
+    public TransformationPath(List<Transformation> aTransformations) {
+        this();
+        transformations.addAll(aTransformations);
+    }
+
+    /**
+     * Appends a transormation path to the current path.
+     * 
+     * @param aSequence
+     *            Transformation sequence to append.
+     * @return Appended transformations equence.
+     * @throws Runtime
+     *             exception if the appended transformation would not be valid.
+     */
+    public TransformationPath appendPath(TransformationPath aSequence) {
+        if (transformations.isEmpty()) {
+            return new TransformationPath(aSequence.transformations);
+        }
+        if (aSequence.transformations.isEmpty()) {
+            // nothing to append
+            return new TransformationPath(transformations);
+        }
+        // both are non-empty
+        if (!getToType().equals(aSequence.getFromType())) {
+            throw new RuntimeException(
+                "error concatening sequence, destination of first differs from source of second");
+        }
+        List<Transformation> t = new ArrayList<Transformation>(transformations);
+        t.addAll(aSequence.transformations);
+        return new TransformationPath(t);
+    }
+
+    /**
+     * @return Number of transformations.
+     */
+    public int size() {
+        return transformations.size();
+    }
+
+    /**
+     * @return From type of the path or null if the sequence is empty.
+     */
+    public String getFromType() {
+        if (transformations.isEmpty()) {
+            return null;
+        }
+        return transformations.get(0).getFromType();
+    }
+
+    /**
+     * @return To type of the path or null if the sequence is empty.
+     */
+    public String getToType() {
+        if (transformations.isEmpty()) {
+            return null;
+        }
+        return transformations.get(transformations.size() - 1).getToType();
+    }
+
+    /**
+     * @return The transformations.
+     */
+    public List<Transformation> getTransformations() {
+        return transformations;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer buf = new StringBuffer();
+        buf.append("TransformationPath(");
+        for (int i = 0; i < transformations.size(); i++) {
+            if (i > 0) {
+                buf.append(", ");
+            }
+            buf.append(transformations.get(i).toString());
+        }
+        buf.append(")");
+        return buf.toString();
+    }
+}