1 files changed, 108 insertions, 0 deletions
diff --git a/qpid/java/client/src/main/java/org/apache/qpid/filter/LogicExpression.java b/qpid/java/client/src/main/java/org/apache/qpid/filter/LogicExpression.java
new file mode 100644
index 0000000000..7ef85cbacb
--- /dev/null
+++ b/qpid/java/client/src/main/java/org/apache/qpid/filter/LogicExpression.java
@@ -0,0 +1,108 @@
+/* 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;
+
+import org.apache.qpid.AMQInternalException;
+import org.apache.qpid.client.message.AbstractJMSMessage;
+
+
+/**
+ * A filter performing a comparison of two objects
+ */
+public abstract class LogicExpression extends BinaryExpression implements BooleanExpression
+{
+
+    public static BooleanExpression createOR(BooleanExpression lvalue, BooleanExpression rvalue)
+    {
+        return new LogicExpression(lvalue, rvalue)
+            {
+
+                public Object evaluate(AbstractJMSMessage message) throws AMQInternalException
+                {
+
+                    Boolean lv = (Boolean) left.evaluate(message);
+                    // Can we do an OR shortcut??
+                    if ((lv != null) && lv.booleanValue())
+                    {
+                        return Boolean.TRUE;
+                    }
+
+                    Boolean rv = (Boolean) right.evaluate(message);
+
+                    return (rv == null) ? null : rv;
+                }
+
+                public String getExpressionSymbol()
+                {
+                    return "OR";
+                }
+            };
+    }
+
+    public static BooleanExpression createAND(BooleanExpression lvalue, BooleanExpression rvalue)
+    {
+        return new LogicExpression(lvalue, rvalue)
+            {
+
+                public Object evaluate(AbstractJMSMessage message) throws AMQInternalException
+                {
+
+                    Boolean lv = (Boolean) left.evaluate(message);
+
+                    // Can we do an AND shortcut??
+                    if (lv == null)
+                    {
+                        return null;
+                    }
+
+                    if (!lv.booleanValue())
+                    {
+                        return Boolean.FALSE;
+                    }
+
+                    Boolean rv = (Boolean) right.evaluate(message);
+
+                    return (rv == null) ? null : rv;
+                }
+
+                public String getExpressionSymbol()
+                {
+                    return "AND";
+                }
+            };
+    }
+
+    /**
+     * @param left
+     * @param right
+     */
+    public LogicExpression(BooleanExpression left, BooleanExpression right)
+    {
+        super(left, right);
+    }
+
+    public abstract Object evaluate(AbstractJMSMessage message) throws AMQInternalException;
+
+    public boolean matches(AbstractJMSMessage message) throws AMQInternalException
+    {
+        Object object = evaluate(message);
+
+        return (object != null) && (object == Boolean.TRUE);
+    }
+
+}