Support for removing nodes based on a predicate

Author: kimble

.travis.yml

@@ -11,7 +11,7 @@ apply plugin: "java"
 
 
 group = 'com.developerb.nmxmlp'
-version = '1.6.1'
+version = '1.6.2'
 
 compileJava {
     sourceCompatibility = 1.8

build.gradle

@@ -232,6 +232,8 @@ public interface Cursor {
 
         void remove() throws Ex;
 
+        void removeChildren(Predicate<Cursor> predicate) throws Ex;
+
         String text();
 
         String describePath();
@@ -272,7 +274,7 @@ public interface Cursor {
         <R> void update(R payload, Inserter<R> inserter) throws Ex;
 
         /**
-         * @param attributeName
+         * @param attributeName Name of the attribute
          * @return True if the node has an attribute with the given name
          */
         boolean hasAttr(String attributeName);
@@ -477,6 +479,9 @@ public <R> void update(R payload, Inserter<R> inserter) {
         public void remove() throws Ex {
         }
 
+        @Override
+        public void removeChildren(Predicate<Cursor> predicate) throws Ex { }
+
         @Override
         public boolean hasAttr(String attributeName) {
             return false;
@@ -670,6 +675,25 @@ public void remove() throws Ex {
             node.getParentNode().removeChild(node);
         }
 
+        @Override
+        public void removeChildren(Predicate<Cursor> predicate) throws Ex {
+            NodeList childNodes = node.getChildNodes();
+            List<Cursor> toBeRemoved = new ArrayList<>();
+
+            for (int i = 0; i < childNodes.getLength(); i++) {
+                Node childNode = childNodes.item(i);
+                Cursor cursor = new NodeCursor(document, ancestors, childNode, i);
+
+                if (predicate.test(cursor)) {
+                    toBeRemoved.add(cursor);
+                }
+            }
+
+            for (Cursor cursor : toBeRemoved) {
+                cursor.remove();
+            }
+        }
+
         @Override
         public <R> R extract(Class<R> type) throws Ex {
             final Extractor<R> extractor = extractorFor(type);

src/main/java/com/developerb/nmxmlp/NX.java

@@ -24,4 +24,12 @@ void removingNodeFromEmptyCursorDoesNothing() {
         cursor.toOptional("no-such-node").remove();
     }
 
+    @Test
+    void removeUsingPredicate() {
+        NX.Cursor cursor = parse("<root><aa>a</aa><ab>ab</ab><ba>ba</ba></root>");
+        cursor.removeChildren((c) -> c.name().startsWith("a"));
+
+        assertEquals("<root><ba>ba</ba></root>", cursor.dumpXml(UTF_8, NX.Feature.DUMP_WITHOUT_XML_DECLARATION));
+    }
+
 }