com.lithium.ldn.starql.models.QlConstraintValue Maven / Gradle / Ivy
package com.lithium.ldn.starql.models;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
* A String value of a boolean constraint in the WHERE clause of a StarQL SELECT Statement.
*
* @author Jake Scheps
* @author David Esposito
*/
public abstract class QlConstraintValue {
/**
* Test if the current object is assignable to a more specific implementation of QlConstraintValue.
* @param constraintValueClass The super type in question.
* @return True if this object can be cast to the provided class without throwing an exception. False
* otherwise.
*/
public boolean isA(Class constraintValueClass) {
return constraintValueClass.isAssignableFrom(this.getClass());
}
/**
* @param constraintValueT The desired type for casting the current object.
* @return The current object typed as the provided class if {@code asA(...)} return {@code true},
* {@code null} otherwise.
*/
@SuppressWarnings("unchecked")
public ConstraintValueT asA(Class constraintValueT) {
if (isA(constraintValueT)) {
return (ConstraintValueT) this;
} else {
return null;
}
}
/**
* @return The object represented by this POJO.
*/
public abstract Object get();
@Override
public int hashCode() {
return HashCodeBuilder.reflectionHashCode(this);
}
@Override
public boolean equals(Object obj) {
return EqualsBuilder.reflectionEquals(this, obj);
}
}