Move adsal into its own subdirectory.

[controller.git] / opendaylight / adsal / northbound / commons / src / main / java / org / opendaylight / controller / northbound / commons / query / ExpressionBuilder.java

diff --git a/opendaylight/adsal/northbound/commons/src/main/java/org/opendaylight/controller/northbound/commons/query/ExpressionBuilder.java b/opendaylight/adsal/northbound/commons/src/main/java/org/opendaylight/controller/northbound/commons/query/ExpressionBuilder.java
new file mode 100644 (file)
index 0000000..f1b2999
--- /dev/null
+++ b/opendaylight/adsal/northbound/commons/src/main/java/org/opendaylight/controller/northbound/commons/query/ExpressionBuilder.java
@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.northbound.commons.query;
+
+import java.util.Stack;
+
+/*package*/ class ExpressionBuilder {
+    private final Stack<Expression> _stack = new Stack<Expression>();
+    private LogicalExpression.OP _lastOp = null;
+
+    public ExpressionBuilder() {}
+
+    public ExpressionBuilder withAnd() {
+        _lastOp = LogicalExpression.OP.AND;
+        return this;
+    }
+
+    public ExpressionBuilder withOr() {
+        _lastOp = LogicalExpression.OP.OR;
+        return this;
+    }
+
+    public ExpressionBuilder withTerm(Expression exp) {
+        if (_lastOp != null) {
+            exp = new LogicalExpression(_lastOp, _stack.pop(), exp);
+            _lastOp = null;
+        }
+        _stack.push(exp);
+        return this;
+    }
+
+    public Expression build() {
+        return _stack.pop();
+    }
+
+}