simplify SQLBuilder

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/rewrite/SQLBuilder.java

@@ -21,71 +21,69 @@ import lombok.AccessLevel;
 import lombok.RequiredArgsConstructor;
 
 import java.util.Collection;
-import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
-import java.util.Map;
 
 /**
  * SQL构建器.
  * 
  * @author gaohongtao
+ * @author zhangliang
  */
 @RequiredArgsConstructor(access = AccessLevel.PRIVATE)
 public final class SQLBuilder {
     
     private final List<Object> segments;
     
-    private final Map<String, SQLBuilderToken> tokenMap;
-    
     private StringBuilder currentSegment;
     
     public SQLBuilder() {
-        this(new LinkedList<>(), new HashMap<String, SQLBuilderToken>());
+        segments = new LinkedList<>();
         currentSegment = new StringBuilder();
         segments.add(currentSegment);
     }
     
-    /**
-     * 追加字面量.
-     *
-     * @param literals 字面量
-     */
-    public void append(final String literals) {
-        currentSegment.append(literals);
-    }
-    
     /**
      * 追加占位符.
      * 
      * @param token 占位符
      */
     public void append(final SQLBuilderToken token) {
-        if (!tokenMap.containsKey(token.getLabel())) {
-            tokenMap.put(token.getLabel(), token);
-        }
-        tokenMap.get(token.getLabel()).getIndexes().add(segments.size());
-        segments.add(tokenMap.get(token.getLabel()));
+        segments.add(token);
         currentSegment = new StringBuilder();
         segments.add(currentSegment);
     }
     
+    /**
+     * 追加字面量.
+     *
+     * @param literals 字面量
+     */
+    public void append(final String literals) {
+        currentSegment.append(literals);
+    }
+    
     /**
      * 用实际的值替代占位符,并返回新的构建器.
-     * 
+     *
      * @param tokens 占位符集合
      * @return 新SQL构建器
      */
     public SQLBuilder createNewSQLBuilder(final Collection<SQLBuilderToken> tokens) {
-        SQLBuilder result = new SQLBuilder(segments, tokenMap);
+        for (Object each : segments) {
+            if (each instanceof SQLBuilderToken) {
+                setToken((SQLBuilderToken) each, tokens);
+            }
+        }
+        return new SQLBuilder(segments);
+    }
+    
+    private void setToken(final SQLBuilderToken targetToken, final Collection<SQLBuilderToken> tokens) {
         for (SQLBuilderToken each : tokens) {
-            SQLBuilderToken originalToken = tokenMap.get(each.getLabel());
-            result.tokenMap.put(each.getLabel(), each);
-            for (Integer index : originalToken.getIndexes()) {
-                result.segments.set(index, each);
+            if (targetToken.getLabel().equals(each.getLabel())) {
+                targetToken.setValue(each.getValue());
             }
         }
-        return result;
     }
     
     /**
@@ -101,6 +99,7 @@ public final class SQLBuilder {
         return result.toString();
     }
     
+    // TODO remove
     @Override
     public String toString() {
         StringBuilder result = new StringBuilder();

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/rewrite/SQLBuilderToken.java

 package com.dangdang.ddframe.rdb.sharding.rewrite;
 
 import com.google.common.base.Joiner;
+import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-
-import java.util.LinkedList;
-import java.util.List;
+import lombok.Setter;
 
 /**
  * SQL构建器占位符.
  *
  * @author zhangliang
  */
+@AllArgsConstructor
 @RequiredArgsConstructor
 @Getter
+@Setter
 public final class SQLBuilderToken {
     
     private final String label;
     
-    private final String value;
-    
-    private final List<Integer> indexes = new LinkedList<>();
+    private String value;
     
     String toToken() {
         if (null == value) {