Builder add bool api (#51)

sqli-builder/src/main/java/io/xream/sqli/builder/Bool.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 io.xream.sqli
+ *
+ * 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 io.xream.sqli.builder;
+
+/**
+ * @author Sim
+ */
+public interface Bool {
+    boolean isOk();
+}

sqli-builder/src/main/java/io/xream/sqli/builder/ConditionBuilder.java

@@ -71,6 +71,13 @@ public CriteriaCondition build() {
         return () -> bbList;
     }
 
+    public ConditionBuilder bool(Bool condition, Then then) {
+        if (condition.isOk()) {
+            then.build(this.instance);
+        }
+        return this.instance;
+    }
+
     public ConditionBuilder eq(String property, Object value){
         return doGle(Op.EQ, property, value);
     }

sqli-builder/src/main/java/io/xream/sqli/builder/Then.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 io.xream.sqli
+ *
+ * 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 io.xream.sqli.builder;
+
+/**
+ * @author Sim
+ */
+public interface Then {
+    void build(ConditionBuilder builder);
+}