1 files changed, 90 insertions, 0 deletions
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/filter/BinaryExpression.java b/qpid/java/common/src/main/java/org/apache/qpid/filter/BinaryExpression.java
new file mode 100644
index 0000000000..6467bbbe1f
--- /dev/null
+++ b/qpid/java/common/src/main/java/org/apache/qpid/filter/BinaryExpression.java
@@ -0,0 +1,90 @@
+/**
+ *
+ * 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.filter;
+//
+// Based on like named file from r450141 of the Apache ActiveMQ project <http://www.activemq.org/site/home.html>
+//
+
+/**
+ * An expression which performs an operation on two expression values.
+ */
+public abstract class BinaryExpression implements Expression
+{
+    private final Expression left;
+    private final Expression right;
+
+    public BinaryExpression(Expression left, Expression right)
+    {
+        this.left = left;
+        this.right = right;
+    }
+
+    public Expression getLeft()
+    {
+        return left;
+    }
+
+    public Expression getRight()
+    {
+        return right;
+    }
+
+    /**
+     * @see java.lang.Object#toString()
+     */
+    public String toString()
+    {
+        return "(" + left.toString() + " " + getExpressionSymbol() + " " + right.toString() + ")";
+    }
+
+    /**
+     * TODO: more efficient hashCode()
+     *
+     * @see java.lang.Object#hashCode()
+     */
+    public int hashCode()
+    {
+        return toString().hashCode();
+    }
+
+    /**
+     * TODO: more efficient hashCode()
+     *
+     * @see java.lang.Object#equals(java.lang.Object)
+     */
+    public boolean equals(Object o)
+    {
+
+        if ((o == null) || !this.getClass().equals(o.getClass()))
+        {
+            return false;
+        }
+
+        return toString().equals(o.toString());
+
+    }
+
+    /**
+     * Returns the symbol that represents this binary expression.  For example, addition is
+     * represented by "+"
+     *
+     * @return
+     */
+    public abstract String getExpressionSymbol();
+
+}