org.apache.ambari.server.api.predicate.expressions

Class LogicalExpression

java.lang.Object

org.apache.ambari.server.api.predicate.expressions.AbstractExpression<Expression>

org.apache.ambari.server.api.predicate.expressions.LogicalExpression

All Implemented Interfaces:

Expression<Expression>

Direct Known Subclasses:

NotLogicalExpression

public class LogicalExpression
extends AbstractExpression<Expression>

Logical expression implementation. Always a binary expression that consists of a logical operator and expressions for the left and right operands.

Constructor Summary

Constructors

Constructor and Description
LogicalExpression(LogicalOperator op) Constructor.

Method Summary

Modifier and Type	Method and Description
List<Expression>	merge(Expression left, Expression right, int precedence) Merge expression with surrounding expressions.
Predicate	toPredicate() Get the predicate representation of the expression.

Methods inherited from class org.apache.ambari.server.api.predicate.expressions.AbstractExpression

defaultMerge, getLeftOperand, getOperator, getRightOperand, setLeftOperand, setRightOperand

Methods inherited from class java.lang.Object

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

Constructor Detail

LogicalExpression

public LogicalExpression(LogicalOperator op)

Constructor.

Parameters:

op - the logical operator of the expression

Method Detail

toPredicate

public Predicate toPredicate()
                      throws InvalidQueryException

Description copied from interface: Expression

Get the predicate representation of the expression.

Returns:

a predicate instance for the expression

Throws:

InvalidQueryException

merge

public List<Expression> merge(Expression left,
                              Expression right,
                              int precedence)

Description copied from interface: Expression

Merge expression with surrounding expressions.

Specified by:

merge in interface Expression<Expression>

Overrides:

merge in class AbstractExpression<Expression>

Parameters:

left - the preceding expression

right - the following expression

precedence - the precedence level being merged. Only expressions at this precedence level should be merged. Others should simply return the left expression, themselves and the right expression in that order.

Returns:

a list of expressions after merging. Do not return any null elements.