Access to nested properties

yaml configuration supports nested properties. With this change
we can read those nested properties.

src/com/sap/piper/ConfigurationHelper.groovy

@@ -74,10 +74,7 @@ class ConfigurationHelper implements Serializable {
     }
 
     def getConfigProperty(key) {
-        if (config[key] != null && config[key].class == String) {
-            return config[key].trim()
-        }
-        return config[key]
+        return getConfigPropertyNested(config, key)
     }
 
     def getConfigProperty(key, defaultValue) {
@@ -88,6 +85,24 @@ class ConfigurationHelper implements Serializable {
         return value
     }
 
+    private getConfigPropertyNested(Map config, key) {
+
+        List parts = (key in String) ? (key as CharSequence).tokenize('/') : ([key] as List)
+
+        if(config[parts.head()] != null) {
+
+            if(config[parts.head()] in Map && parts.size() > 1) {
+                return getConfigPropertyNested(config[parts.head()], String.join('/', parts[1..parts.size()-1]))
+            }
+
+            if (config[parts.head()].class == String) {
+                return (config[parts.head()] as String).trim()
+            }
+        }
+
+        return config[parts.head()]
+    }
+
     def isPropertyDefined(key){
 
         def value = getConfigProperty(key)

test/groovy/com/sap/piper/ConfigurationHelperTest.groovy

@@ -3,7 +3,10 @@ package com.sap.piper
 import groovy.test.GroovyAssert
 
 import static org.hamcrest.Matchers.*
+import static org.junit.Assert.assertEquals
+import static org.junit.Assert.assertThat
 
+import org.hamcrest.Matchers
 import org.junit.Assert
 import org.junit.Rule
 import org.junit.Test
@@ -29,6 +32,24 @@ class ConfigurationHelperTest {
         Assert.assertFalse(configuration.isPropertyDefined('something'))
     }
 
+    @Test
+    void testGetPropertyNestedLeafNodeIsString() {
+        def configuration = new ConfigurationHelper([a:[b: 'c']])
+        assertThat(configuration.getConfigProperty('a/b'), is('c'))
+    }
+
+    @Test
+    void testGetPropertyNestedLeafNodeIsMap() {
+        def configuration = new ConfigurationHelper([a:[b: [c: 'd']]])
+        assertThat(configuration.getConfigProperty('a/b'), is([c: 'd']))
+    }
+
+    @Test
+    void testGetPropertyNestedPathNotFound() {
+        def configuration = new ConfigurationHelper([a:[b: 'c']])
+        assertThat(configuration.getConfigProperty('a/c'), is((nullValue())))
+    }
+
     @Test
     void testIsPropertyDefined() {
         def configuration = new ConfigurationHelper(getConfiguration())