Java tutorial
/* Copyright 2013 Red Hat, Inc. and/or its affiliates. This file is part of lightblue. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.redhat.lightblue.query; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.node.ObjectNode; /** * Base class for comparison expressions */ public abstract class ComparisonExpression extends QueryExpression { private static final long serialVersionUID = 1L; /** * Parses a relational expression or an array comparison expression from the * given json object */ public static ComparisonExpression fromJson(ObjectNode node) { JsonNode x = node.get("field"); if (x != null) { return RelationalExpression.fromJson(node); } else { return ArrayComparisonExpression.fromJson(node); } } }