Package de.calamanari.adl.sql.cnv

Class SqlConversionContext

java.lang.Object
de.calamanari.adl.sql.cnv.SqlConversionContext
All Implemented Interfaces:
de.calamanari.adl.cnv.ConversionContext
public class SqlConversionContext extends Object implements de.calamanari.adl.cnv.ConversionContext
The SqlConversionContext is a container holding the information for a particular level of the expression to be converted while visiting the CoreExpression's DAG.

Important: Each SqlConversionContext instance has a local (level) state and a global state (process state of the converter). The clear()-command does not affect the instance returned by getProcessContext().
The global state gets assigned by the converter (precisely the SqlConversionProcessContext injects itself upon creation of the level context object. This ensures that the global process is common for all level context objects created during the same conversion run.

The concept allows parts of the conversion logic not only to access configuration data and the isolated data of a level and the parent level but also to exchange information. This is for example required when we automatically map arguments to columns with derived filter conditions.

Author:
Karl Eilebrecht

  • Constructor Details

    • SqlConversionContext

      public SqlConversionContext()

  • Method Details

    • skipChildExpression

      public void skipChildExpression(de.calamanari.adl.irl.CoreExpression expression)
      Sets the given expression on the skip-list to prevent duplicate processing, if a child has been processed implicitly by the parent
      Parameters:
      expression - to be marked as skipped

    • isSkipped

      public boolean isSkipped(de.calamanari.adl.irl.CoreExpression expression)
      Parameters:
      expression -
      Returns:
      true if the given element has been skipped and should not be processed again

    • isNegation

      public boolean isNegation()
      Returns:
      true if we are currently processing a negated match

    • markNegation

      public void markNegation()
      Marks this level to be a negated match

    • getCombiType

      public de.calamanari.adl.CombinedExpressionType getCombiType()
      Returns:
      combination type of this level, AND by default

    • setCombiType

      public void setCombiType(de.calamanari.adl.CombinedExpressionType combiType)
      Parameters:
      combiType - combination type to be set for the current level

    • clear

      public void clear()
      Resets this context to its defaults
      Specified by:
      clear in interface de.calamanari.adl.cnv.ConversionContext

    • setProcessContext

      public void setProcessContext(SqlConversionProcessContext processContext)
      Method to be called initially by the converter to ensure all level contexts created during a conversion share the same global process context.
      Parameters:
      processContext - the converters global state

    • suppressClosingBrace

      public void suppressClosingBrace()
      Sets a flag that we don't need a closing brace because a formerly combined expression (OR/AND)
      has turned into a simple IN or NOT IN SQL condition.

    • isClosingBraceSuppressed

      public boolean isClosingBraceSuppressed()
      Returns:
      true if an OR/AND should omit the closing brace

    • getSkippedChildExpressions

      public List<de.calamanari.adl.irl.CoreExpression> getSkippedChildExpressions()
      Returns:
      list with skipped child expressions

    • getProcessContext

      public SqlConversionProcessContext getProcessContext()
      Returns:
      the global part of the context (related to the conversion process independent from the levels)