org.apache.paimon.codegen.codesplit

类 BlockStatementGrouper

java.lang.Object

org.apache.paimon.codegen.codesplit.BlockStatementGrouper

public class BlockStatementGrouper
extends Object

Groups end extract single line statements such as operations on fields/local variables, IF and WHILE statements and extract new method for each group making them smaller.

BlockStatementGrouper does not recognize if statement operates on local of class member variable. Because of that, code must be preprocessed by DeclarationRewriter which converts all local variables extracted as to member variables.

Before

 {
     a[0] += b[1];
     b[1] += a[1];
     while (counter > 0) {
         myFun_whileBody0_0(a, b);
         if (a[0] > 0) {
             myFun_whileBody0_0_ifBody0(a, b);
         } else {
             myFun_whileBody0_0_ifBody1(a, b);
         }
         counter--;
     }

     a[2] += b[2];
     b[3] += a[3];
 }

 

After

 {
     myFun_rewriteGroup4(a, b);
     myFun_rewriteGroup5(a, b);
 }
 

Where bodies of extracted "methods" are:

     myFun_rewriteGroup4 ->
         a[0] += b[1];
         b[1] += a[1];
         while (counter > 0) {
             myFun_rewriteGroup0_1_rewriteGroup3(a, b);
             counter--;
         }
 

     myFun_rewriteGroup5 ->
         a[2] += b[2];
         b[3] += a[3];
 

     myFun_rewriteGroup0_1_rewriteGroup3 ->
         myFun_whileBody0_0(a, b);
         if (a[0] > 0) {
             myFun_whileBody0_0_ifBody0(a, b);
         } else {
             myFun_whileBody0_0_ifBody1(a, b);
         }
 

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	BlockStatementGrouper.RewriteGroupedCode This object represents a rewritten code block.

构造器概要

构造器

构造器和说明
BlockStatementGrouper(String code, long maxMethodLength, String parameters) Initialize new BlockStatementGrouper.

方法概要

限定符和类型	方法和说明
BlockStatementGrouper.RewriteGroupedCode	rewrite(String context) Rewrite code block used for initialization of this object.

从类继承的方法 java.lang.Object

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

构造器详细资料

BlockStatementGrouper

public BlockStatementGrouper(String code,
                             long maxMethodLength,
                             String parameters)

Initialize new BlockStatementGrouper.

参数:

code - code block that should be rewritten for statement grouping.

maxMethodLength - maximal length of the extracted code block.

parameters - parameters definition that should be used for extracted methods.

方法详细资料

rewrite

public BlockStatementGrouper.RewriteGroupedCode rewrite(String context)

Rewrite code block used for initialization of this object. The code block is grouped into new methods.

参数:

context - prefix used for extracted group names.

返回:

BlockStatementGrouper.RewriteGroupedCode representing rewritten code block and containing extracted groups with their names and content.