Add classes for visitor traversal

[cql-java-moved-to-github.git] / src / main / java / org / z3950 / zing / cql / CQLDefaultNodeVisitor.java

diff --git a/src/main/java/org/z3950/zing/cql/CQLDefaultNodeVisitor.java b/src/main/java/org/z3950/zing/cql/CQLDefaultNodeVisitor.java
new file mode 100644 (file)
index 0000000..d77dafb
--- /dev/null
+++ b/src/main/java/org/z3950/zing/cql/CQLDefaultNodeVisitor.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 1995-2014, Index Data
+ * All rights reserved.
+ * See the file LICENSE for details.
+ */
+
+package org.z3950.zing.cql;
+
+/**
+ * Query tree visitor with default (no-op) implementation
+ * @author jakub
+ */
+public class CQLDefaultNodeVisitor implements CQLNodeVisitor {
+
+  @Override
+  public void onSortNode(CQLSortNode node) {
+  }
+
+  @Override
+  public void onPrfixNode(CQLPrefixNode node) {
+  }
+
+  @Override
+  public void onBooleanNode(CQLBooleanNode node) {
+  }
+
+  @Override
+  public void onProxNode(CQLProxNode node) {
+  }
+
+  @Override
+  public void onAndNode(CQLAndNode node) {
+  }
+
+  @Override
+  public void onOrNode(CQLOrNode node) {
+  }
+
+  @Override
+  public void onNotNode(CQLNotNode node) {
+  }
+
+  @Override
+  public void onTermNode(CQLTermNode node) {
+  }
+
+  @Override
+  public void onRelation(CQLRelation relation) {
+  }
+  
+}