org.eigenbase.oj.rel
Class JavaRelImplementor.TranslationTester

java.lang.Object
  org.eigenbase.oj.rel.JavaRelImplementor.TranslationTester

Enclosing class:

JavaRelImplementor

public static class JavaRelImplementor.TranslationTester
extends Object

Similar to RexToOJTranslator, but instead of translating, merely tests whether an expression can be translated.

Nested Class Summary

private static class

JavaRelImplementor.TranslationTester.CannotTranslate Thrown when we encounter an expression which cannot be translated.

Field Summary

private boolean	deep
private RexToOJTranslator	translator

Constructor Summary

JavaRelImplementor.TranslationTester(RexToOJTranslator translator, boolean deep)

Method Summary

boolean	canTranslate(RexNode rex) Returns whether an expression can be translated.
protected void	go(RexNode rex) Walks over an expression, and throws CannotTranslate if expression cannot be translated.

Methods inherited from class java.lang.Object

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

Field Detail

translator

private final RexToOJTranslator translator

deep

private final boolean deep

Constructor Detail

JavaRelImplementor.TranslationTester

public JavaRelImplementor.TranslationTester(RexToOJTranslator translator,
                                            boolean deep)

Method Detail

canTranslate

public boolean canTranslate(RexNode rex)

Returns whether an expression can be translated.

go

protected void go(RexNode rex)
           throws JavaRelImplementor.TranslationTester.CannotTranslate

Walks over an expression, and throws CannotTranslate if expression cannot be translated.

Parameters:

rex - Expression

Throws:

JavaRelImplementor.TranslationTester.CannotTranslate - if expression or a sub-expression cannot be translated