org.mybatis.dynamic.sql.where.render

Class CriterionRenderer

java.lang.Object

org.mybatis.dynamic.sql.where.render.CriterionRenderer

All Implemented Interfaces:

SqlCriterionVisitor<Optional<RenderedCriterion>>

public class CriterionRenderer
extends Object
implements SqlCriterionVisitor<Optional<RenderedCriterion>>

Renders a SqlCriterion to a RenderedCriterion. The process is complex because all conditions may or may not be a candidate for rendering. For example, "isEqualWhenPresent" will not render when the value is null. It is also complex because SqlCriterion may or may not include sub-criteria.

Rendering is a recursive process. The renderer will recurse into each sub-criteria - which may also contain further sub-criteria - until all possible sub-criteria are rendered into a single fragment. So, for example, the fragment may end up looking like:

     col1 = ? and (col2 = ? or (col3 = ? and col4 = ?))
 

It is also possible that the end result will be empty if all criteria and sub-criteria are not valid for rendering.

Author:

Jeff Butler

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CriterionRenderer.Builder

Method Summary

Modifier and Type	Method and Description
<T> Optional<RenderedCriterion>	visit(ColumnAndConditionCriterion<T> criterion)
Optional<RenderedCriterion>	visit(ExistsCriterion criterion)

Methods inherited from class java.lang.Object

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

Method Detail

visit

public <T> Optional<RenderedCriterion> visit(ColumnAndConditionCriterion<T> criterion)

Specified by:

visit in interface SqlCriterionVisitor<Optional<RenderedCriterion>>

visit

public Optional<RenderedCriterion> visit(ExistsCriterion criterion)

Specified by:

visit in interface SqlCriterionVisitor<Optional<RenderedCriterion>>