/*
* *************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
* *************************************************************************************
*/
package com.espertech.esper.client.hook;
/**
* Enumeration for indicating the type of operator for a lookup against a virtual data window, see {@link VirtualDataWindowLookupContext}.
*/
public enum VirtualDataWindowLookupOp {
/**
* Equals (=).
*/
EQUALS("="),
/**
* Less (<).
*/
LESS("<"),
/**
* Less or equal (<=).
*/
LESS_OR_EQUAL("<="),
/**
* Greater or equal (>=).
*/
GREATER_OR_EQUAL(">="),
/**
* Greater (>).
*/
GREATER(">"),
/**
* Range contains neither endpoint, i.e. (a,b)
*/
RANGE_OPEN("(,)"),
/**
* Range contains low and high endpoint, i.e. [a,b]
*/
RANGE_CLOSED("[,]"),
/**
* Range includes low endpoint but not high endpoint, i.e. [a,b)
*/
RANGE_HALF_OPEN("[,)"),
/**
* Range includes high endpoint but not low endpoint, i.e. (a,b]
*/
RANGE_HALF_CLOSED("(,]"),
/**
* Inverted-Range contains neither endpoint, i.e. (a,b)
*/
NOT_RANGE_OPEN("-(,)"),
/**
* Inverted-Range contains low and high endpoint, i.e. [a,b]
*/
NOT_RANGE_CLOSED("-[,]"),
/**
* Inverted-Range includes low endpoint but not high endpoint, i.e. [a,b)
*/
NOT_RANGE_HALF_OPEN("-[,)"),
/**
* Inverted-Range includes high endpoint but not low endpoint, i.e. (a,b]
*/
NOT_RANGE_HALF_CLOSED("-(,]");
private final String op;
private VirtualDataWindowLookupOp(String op) {
this.op = op;
}
/**
* Returns the string-value of the operator.
* @return operator string value
*/
public String getOp() {
return op;
}
/**
* Map the operator from a string-value.
* @param stringOp to map from
* @return operator
* @throws IllegalArgumentException if the string operator cannot be understood
*/
public static VirtualDataWindowLookupOp fromOpString(String stringOp) {
for (VirtualDataWindowLookupOp op : VirtualDataWindowLookupOp.values()) {
if (op.getOp().equals(stringOp)) {
return op;
}
}
throw new IllegalArgumentException("Failed to recognize operator '" + stringOp + "'");
}
}