1 files changed, 64 insertions, 0 deletions
diff --git a/qpid/tools/src/java/qpid-qmf2/src/main/java/org/apache/qpid/qmf2/common/LogicalExpression.java b/qpid/tools/src/java/qpid-qmf2/src/main/java/org/apache/qpid/qmf2/common/LogicalExpression.java
new file mode 100644
index 0000000000..23a5ac3abd
--- /dev/null
+++ b/qpid/tools/src/java/qpid-qmf2/src/main/java/org/apache/qpid/qmf2/common/LogicalExpression.java
@@ -0,0 +1,64 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.qpid.qmf2.common;
+
+// Misc Imports
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/*
+ * This class represents the base class for all Logical Expressions (and, or, not) created by expanding the Query predicate.
+ *
+ * @author Fraser Adams
+ */
+public abstract class LogicalExpression extends Expression
+{
+    protected List<Expression> _subExpressions = new ArrayList<Expression>();
+
+    /**
+     * Constructor. This method iterates through collecting the sub-expressions of the Logical Expression
+     *
+     * @param expr the List of sub-expressions extracted by parsing the Query predicate, the first one should be
+     *        the Logical Expression's operator name
+     */
+    public LogicalExpression(final List expr) throws QmfException
+    {
+        Iterator iter = expr.listIterator();
+        String op = (String)iter.next();
+//System.out.println("LogicalExpression, op = " + op);
+
+        // Collect sub-expressions
+        while (iter.hasNext())
+        {
+            Object object = iter.next();
+            if (object instanceof List)
+            {
+                _subExpressions.add(createExpression((List)object));
+            }
+            else
+            {
+                throw new QmfException("Operands of " + op + " must be Lists");
+            }
+        }
+    }
+}
+