Package org.hcjf.layers.query.evaluators

Class FieldEvaluator

java.lang.Object

org.hcjf.layers.query.evaluators.BaseEvaluator

org.hcjf.layers.query.evaluators.FieldEvaluator

All Implemented Interfaces:

Evaluator

Direct Known Subclasses:

Equals, GreaterThan, In, Like, SmallerThan

public abstract class FieldEvaluator
extends BaseEvaluator

This abstract class define the structure of the evaluating. The evaluator is the implementation of a method to decide if an object is part of the result of the query or not is.

Author:

javaito

Nested Class Summary

Nested classes/interfaces inherited from class org.hcjf.layers.query.evaluators.BaseEvaluator

BaseEvaluator.QueryValue, BaseEvaluator.ReplaceableValue, BaseEvaluator.UnprocessedValue

Constructor Summary

Constructors

Constructor	Description
FieldEvaluator(java.lang.Object leftValue, java.lang.Object rightValue)

Method Summary

Modifier and Type	Method	Description
boolean	containsReference(java.lang.String fieldName)	This method check if the evaluator contains a reference of the field indicated as parameter.
FieldEvaluator	copy()	Copy this field evaluator with other value.
boolean	equals(java.lang.Object obj)	Two evaluators are equals when are instances of the same class, his field names are equals and his values are equals
java.lang.Object	getLeftValue()	Returns the left value of the evaluator.
protected java.lang.Object	getProcessedLeftValue(java.lang.Object currentResultSetElement, Queryable.DataSource dataSource, Queryable.Consumer consumer)	Returns the left processed value for the specific data source and consumer.
protected java.lang.Object	getProcessedRightValue(java.lang.Object currentResultSetElement, Queryable.DataSource dataSource, Queryable.Consumer consumer)	Returns the right processed value for the specific data source and consumer.
java.lang.Object	getRightValue()	Returns the right value of the evaluator.
protected boolean	numberEquals(java.lang.Number fieldValue, java.lang.Object value)	Normalize any kind of number and compare both;
java.lang.String	toString()	Return the string representation of the evaluator.

Methods inherited from class org.hcjf.layers.query.evaluators.BaseEvaluator

getEvaluatorFields, getProcessedValue, isTrueForced, setEvaluatorFields, setTrueForced

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hcjf.layers.query.evaluators.Evaluator

evaluate

Constructor Detail

FieldEvaluator

public FieldEvaluator(java.lang.Object leftValue,
                      java.lang.Object rightValue)

Method Detail

containsReference

public final boolean containsReference(java.lang.String fieldName)

This method check if the evaluator contains a reference of the field indicated as parameter.

Parameters:

fieldName - Field name.

Returns:

True if the evaluator contains the reference and false in the otherwise.

getLeftValue

public final java.lang.Object getLeftValue()

Returns the left value of the evaluator.

Returns:

Left value of the evaluator.

getProcessedLeftValue

protected final java.lang.Object getProcessedLeftValue(java.lang.Object currentResultSetElement,
                                                       Queryable.DataSource dataSource,
                                                       Queryable.Consumer consumer)

Returns the left processed value for the specific data source and consumer.

Parameters:

currentResultSetElement - Is the result set element to evaluate.

dataSource - Data source instance.

consumer - Consumer instance.

Returns:

Processed left value.

getRightValue

public final java.lang.Object getRightValue()

Returns the right value of the evaluator.

Returns:

Right value of the evaluator.

getProcessedRightValue

protected final java.lang.Object getProcessedRightValue(java.lang.Object currentResultSetElement,
                                                        Queryable.DataSource dataSource,
                                                        Queryable.Consumer consumer)

Returns the right processed value for the specific data source and consumer.

Parameters:

currentResultSetElement - Is the result set element to evaluate.

dataSource - Data source instance.

consumer - Consumer instance.

Returns:

Processed right value.

copy

public final FieldEvaluator copy()

Copy this field evaluator with other value.

Returns:

New instance.

numberEquals

protected boolean numberEquals(java.lang.Number fieldValue,
                               java.lang.Object value)

Normalize any kind of number and compare both;

Parameters:

fieldValue - Field value.

value - Value.

Returns:

True if the field value and value are equals as number.

equals

public boolean equals(java.lang.Object obj)

Two evaluators are equals when are instances of the same class, his field names are equals and his values are equals

Overrides:

equals in class java.lang.Object

Parameters:

obj - Object to compare.

Returns:

True if the instance is equals than object parameter and false in the other ways.

toString

public java.lang.String toString()

Return the string representation of the evaluator.

Overrides:

toString in class java.lang.Object

Returns:

Format: ClassName[fieldName,value]