From 74380e1fc9795400d24c813fc589163e359c7dc3 Mon Sep 17 00:00:00 2001
From: Mattias Hellborg Arthursson <mattias@261consulting.com>
Date: Wed, 14 Aug 2013 14:15:31 +0200
Subject: [PATCH] LDAP-226: empty OrFilter should be false (|) and empty
 AndFilter should be true (&), see also rfc4526 Added two new Filter
 implementations: AbsoluteTrueFilter and AbsoluteFalseFilter.

---
 .../ldap/filter/AbsoluteFalseFilter.java      | 29 ++++++++++++++++++
 .../ldap/filter/AbsoluteTrueFilter.java       | 30 +++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 core/src/main/java/org/springframework/ldap/filter/AbsoluteFalseFilter.java
 create mode 100644 core/src/main/java/org/springframework/ldap/filter/AbsoluteTrueFilter.java

diff --git a/core/src/main/java/org/springframework/ldap/filter/AbsoluteFalseFilter.java b/core/src/main/java/org/springframework/ldap/filter/AbsoluteFalseFilter.java
new file mode 100644
index 00000000..26a5d7ca
--- /dev/null
+++ b/core/src/main/java/org/springframework/ldap/filter/AbsoluteFalseFilter.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2005-2010 the original author or authors.
+ *
+ * Licensed 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.springframework.ldap.filter;
+
+/**
+ * A filter that will always evaluate to <code>false</code>, as specified in RFC4526.
+ *
+ * @author Mattias Hellborg Arthursson
+ * @see <a href="http://tools.ietf.org/html/rfc4526">RFC4526</a>
+ * @since 1.3.2
+ */
+public class AbsoluteFalseFilter extends AbstractFilter {
+    public StringBuffer encode(StringBuffer buff) {
+        return buff.append("(|)");
+    }
+}
diff --git a/core/src/main/java/org/springframework/ldap/filter/AbsoluteTrueFilter.java b/core/src/main/java/org/springframework/ldap/filter/AbsoluteTrueFilter.java
new file mode 100644
index 00000000..d68b5931
--- /dev/null
+++ b/core/src/main/java/org/springframework/ldap/filter/AbsoluteTrueFilter.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2005-2010 the original author or authors.
+ *
+ * Licensed 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.springframework.ldap.filter;
+
+/**
+ * A filter that will always evaluate to <code>true</code>, as specified in RFC4526.
+ *
+ * @author Mattias Hellborg Arthursson
+ * @see <a href="http://tools.ietf.org/html/rfc4526">RFC4526</a>
+ * @since 1.3.2
+ */
+public class AbsoluteTrueFilter extends AbstractFilter {
+    public StringBuffer encode(StringBuffer buff) {
+        buff.append("(&)");
+        return buff;
+    }
+}