为了提高对XmlElement实例对象创建简化代码编写，新增支持建造者模式特性支持：XmlElementBuilder。

单元测试类：XmlElementBuilderTest

Author: dongdongshi5

src/main/java/com/itfsw/mybatis/generator/plugins/builder/XmlElementBuilder.java

@@ -0,0 +1,70 @@
+package com.itfsw.mybatis.generator.plugins.builder;
+
+import org.mybatis.generator.api.dom.xml.Attribute;
+import org.mybatis.generator.api.dom.xml.Element;
+import org.mybatis.generator.api.dom.xml.TextElement;
+import org.mybatis.generator.api.dom.xml.XmlElement;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @description: XmlElement 的建造者模式
+ * <code>
+ *     XmlElement xmlElement = new XmlElementBuilder().name("sql")
+ *     .attribute("id","queryCondition")
+ *     .element(whereElement)
+ *     .build();
+ * </code>
+ * @see XmlElement
+ * @Date : 2020/7/2 上午10:43
+ * @Author : 石冬冬-Seig Heil
+ */
+public class XmlElementBuilder {
+
+    /** The attributes. */
+    private List<Attribute> attributes = new ArrayList<>();
+
+    /** The elements. */
+    private List<Element> elements = new ArrayList<>();
+
+    /** The name. */
+    private String name;
+
+
+    public XmlElementBuilder name(String name){
+        this.name = name;
+        return this;
+    }
+
+    public XmlElementBuilder attribute(String name, String value){
+        attributes.add(new Attribute(name,value));
+        return this;
+    }
+
+    public XmlElementBuilder text(String text){
+        elements.add(new TextElement(text));
+        return this;
+    }
+
+    public XmlElementBuilder element(Element element){
+        elements.add(element);
+        return this;
+    }
+
+    public XmlElementBuilder elements(List<Element> list){
+        elements.addAll(list);
+        return this;
+    }
+
+    /**
+     * 提供 XmlElement 实例对象属性的封装
+     * @return
+     */
+    public XmlElement build(){
+        XmlElement xmlElement = new XmlElement(this.name);
+        attributes.forEach(each -> xmlElement.addAttribute(each));
+        elements.forEach(each -> xmlElement.addElement(each));
+        return xmlElement;
+    }
+}

src/test/java/com/itfsw/mybatis/generator/plugins/builder/XmlElementBuilderTest.java

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+package com.itfsw.mybatis.generator.plugins.builder;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Test;
+import org.mybatis.generator.api.dom.xml.Element;
+import org.mybatis.generator.api.dom.xml.XmlElement;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @description: XmlElementBuilder
+ * @Date : 2020/7/2 上午10:56
+ * @Author : 石冬冬-Seig Heil
+ */
+@Slf4j
+public class XmlElementBuilderTest {
+
+    /**
+     * for console
+     *
+     * <code>
+     *   <sql id="queryCondition">
+             <where>
+                 <if test="year != null">
+                    and year = #{year}
+                 </if>
+                 <if test="month != null">
+                    and month = #{month}
+                 </if>
+             </where>
+         </sql>
+        </code>
+     */
+    @Test
+    public void test(){
+
+        List<Element> ifElements = new ArrayList<>();
+
+        ifElements.add(new XmlElementBuilder().name("if").attribute("test","year != null").text(" and year = #{year}").build());
+        ifElements.add(new XmlElementBuilder().name("if").attribute("test","month != null").text(" and month = #{month}").build());
+
+        XmlElement whereElement = new XmlElementBuilder().name("where").elements(ifElements).build();
+
+        XmlElement xmlElement = new XmlElementBuilder().name("sql")
+                .attribute("id","queryCondition")
+                .element(whereElement)
+                .build();
+        String sql = xmlElement.getFormattedContent(1);
+        log.info("\n{}",sql);
+    }
+}