org.apache.calcite.adapter.enumerable

Class NestedBlockBuilderImpl

java.lang.Object

org.apache.calcite.adapter.enumerable.NestedBlockBuilderImpl

All Implemented Interfaces:

NestedBlockBuilder

Direct Known Subclasses:

AggResetContextImpl

public class NestedBlockBuilderImpl
extends Object
implements NestedBlockBuilder

Allows to build nested code blocks with tracking of current context.

See Also:

StrictAggImplementor.implementAdd(AggContext, AggAddContext)

Constructor Summary

Constructors

Constructor and Description
NestedBlockBuilderImpl(org.apache.calcite.linq4j.tree.BlockBuilder block) Constructs nested block builders starting of a given code block.

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.linq4j.tree.BlockBuilder	currentBlock() Returns the current code block.
void	exitBlock() Leaves the current code block.
org.apache.calcite.linq4j.tree.BlockBuilder	nestBlock() Starts nested code block.
void	nestBlock(org.apache.calcite.linq4j.tree.BlockBuilder block) Uses given block as the new code context.

Methods inherited from class java.lang.Object

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

Constructor Detail

NestedBlockBuilderImpl

public NestedBlockBuilderImpl(org.apache.calcite.linq4j.tree.BlockBuilder block)

Constructs nested block builders starting of a given code block.

Parameters:

block - root code block

Method Detail

nestBlock

public final org.apache.calcite.linq4j.tree.BlockBuilder nestBlock()

Starts nested code block. The resulting block can optimize expressions and reuse already calculated values from the parent blocks.

Specified by:

nestBlock in interface NestedBlockBuilder

Returns:

new code block that can optimize expressions and reuse already calculated values from the parent blocks.

nestBlock

public final void nestBlock(org.apache.calcite.linq4j.tree.BlockBuilder block)

Uses given block as the new code context. The current block will be restored after exitBlock() call.

Specified by:

nestBlock in interface NestedBlockBuilder

Parameters:

block - new code block

See Also:

exitBlock()

currentBlock

public final org.apache.calcite.linq4j.tree.BlockBuilder currentBlock()

Returns the current code block.

Specified by:

currentBlock in interface NestedBlockBuilder

exitBlock

public final void exitBlock()

Leaves the current code block.

Specified by:

exitBlock in interface NestedBlockBuilder

See Also:

nestBlock()