com.metamatrix.query.processor.proc
Class AssignmentInstruction

java.lang.Object
  com.metamatrix.query.processor.program.ProgramInstruction
      com.metamatrix.query.processor.proc.CommandInstruction
          com.metamatrix.query.processor.proc.AbstractAssignmentInstruction
              com.metamatrix.query.processor.proc.AssignmentInstruction

All Implemented Interfaces:

Describable, java.lang.Cloneable

public class AssignmentInstruction
extends AbstractAssignmentInstruction

This instruction updates the current variable context with a value for the Variable defined using a DeclareInstruction, the vriable value is obtained by either processing a expression or a command(stored as a processplan). The Processing of the command is expected to result in 1 column, 1 row tuple.

Field Summary

Fields inherited from interface com.metamatrix.query.processor.Describable

PROP_BINDINGS, PROP_CHILDREN, PROP_CONDITIONS, PROP_CRITERIA, PROP_DATA_COL, PROP_DEFAULT, PROP_DEFAULT_PROGRAM, PROP_ELSE, PROP_ENCODING, PROP_EXECUTION_PLAN, PROP_EXPRESSION, PROP_FORMATTED, PROP_GROUP, PROP_GROUP_COLS, PROP_IN_MEMORY, PROP_INTO_GROUP, PROP_IS_STAGING, PROP_JOIN_CRITERIA, PROP_JOIN_STRATEGY, PROP_JOIN_TYPE, PROP_MESSAGE, PROP_MODEL_NAME, PROP_NAMESPACE, PROP_NAMESPACE_DECL, PROP_NODE_COST_ESTIMATES, PROP_NODE_STATS_LIST, PROP_NODE_STATS_PROPS, PROP_OPTIONAL, PROP_OUTPUT_COLS, PROP_PROGRAM, PROP_PROGRAMS, PROP_RECURSE_DIR, PROP_REMOVE_DUPS, PROP_RESULT_SET, PROP_ROW_LIMIT, PROP_ROW_OFFSET, PROP_SELECT_COLS, PROP_SORT_COLS, PROP_SQL, PROP_TAG, PROP_THEN, PROP_TYPE, PROP_VARIABLE

Constructor Summary

AssignmentInstruction()

Method Summary

java.lang.Object	clone() Override Object.clone() to make the method public.
protected void	getDescriptionProperties(java.util.Map props)
protected void	processValue(java.lang.Object value, VariableContext varContext)
java.lang.String	toString()

Methods inherited from class com.metamatrix.query.processor.proc.AbstractAssignmentInstruction

cloneState, getChildPlans, getDescriptionProperties, getExpression, getProcessorPlan, getProcessPlan, getVariable, process, setExpression, setProcessPlan, setVariable

Methods inherited from class com.metamatrix.query.processor.proc.CommandInstruction

cloneReferences, getReferences, setReferences

Methods inherited from class java.lang.Object

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

Constructor Detail

AssignmentInstruction

public AssignmentInstruction()

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

clone

public java.lang.Object clone()

Description copied from class: ProgramInstruction

Override Object.clone() to make the method public. This method simply calls super.clone(), deferring to the default shallow cloning. Some ProcessorInstruction subclasses may need to override with custom safe or deep cloning.

Overrides:

clone in class ProgramInstruction

Returns:

shallow clone

See Also:

ProgramInstruction.clone()

processValue

protected void processValue(java.lang.Object value,
                            VariableContext varContext)
                     throws MetaMatrixComponentException,
                            MetaMatrixProcessingException

Specified by:

processValue in class AbstractAssignmentInstruction

Throws:

MetaMatrixComponentException

MetaMatrixProcessingException

See Also:

com.metamatrix.query.processor.proc.AbstractAssignmentInstruction#processValue(java.lang.Object)

getDescriptionProperties

protected void getDescriptionProperties(java.util.Map props)

Specified by:

getDescriptionProperties in class AbstractAssignmentInstruction

See Also:

AbstractAssignmentInstruction.getDescriptionProperties(java.util.Map)