org.apache.paimon.codegen.codesplit

Class BlockStatementRewriter

java.lang.Object

org.apache.paimon.codegen.codesplit.BlockStatementRewriter

All Implemented Interfaces:

CodeRewriter

public class BlockStatementRewriter
extends Object
implements CodeRewriter

Extract branch of IFs, ELSEs statements and WHILEs code blocks into smaller methods. Single line statement blocks, with more than one statement, like field or local variable operations will be extracted also to separate methods.

This rewriter only deals with functions without return values. Functions with return values should have been converted by ReturnValueRewriter. Also, this rewriter will not extract blocks containing return statements for correctness.

Before

 public class Example {

     int b;
     int c;

     public void myFun(int a) {

         int counter = 10;
         while (counter > 0) {
             int localA = a + 1000;
             System.out.println(localA);
             if (a > 0) {
                 b = a * 2;
                 c = b * 2;
                 System.out.println(b);
             } else {
                 b = a * 3;
                 System.out.println(b);
             }
             counter--;
         }
     }
 }
 

After

 public class Example {

     int b;
     int c;

     public void myFun(int a) {

         int counter = 10;

         while (counter > 0) {
             myFun_rewriteGroup1(a);
             counter--;
         }
     }

     void myFun_rewriteGroup1(int a) {
         myFun_whileBody0_0(a);
         if (a > 0) {
             myFun_whileBody0_0_ifBody0(a);
         } else {
             myFun_whileBody0_0_ifBody1(a);
         }
     }

     void myFun_whileBody0_0(int a) {
         int localA = a + 1000;
         System.out.println(localA);
     }

     void myFun_whileBody0_0_ifBody1(int a) {
         b = a * 3;
         System.out.println(b);
     }

     void myFun_whileBody0_0_ifBody0(int a) {
         b = a * 2;
         c = b * 2;
         System.out.println(b);
     }
 }
 

Constructor Summary

Constructors

Constructor and Description
BlockStatementRewriter(String code, long maxMethodLength)

Method Summary

Modifier and Type	Method and Description
String	rewrite()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BlockStatementRewriter

public BlockStatementRewriter(String code,
                              long maxMethodLength)

Method Detail

rewrite

public String rewrite()

Specified by:

rewrite in interface CodeRewriter