/* 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; import com.redhat.lightblue.util.Error; /** * Expression of the form * <pre> * { $not : { query } } * </pre> */ public class UnaryLogicalExpression extends LogicalExpression { private static final long serialVersionUID = 1L; private final UnaryLogicalOperator op; private final QueryExpression query; public UnaryLogicalExpression(UnaryLogicalOperator op, QueryExpression query) { this.op = op; this.query = query; } /** * Returns the operator */ public UnaryLogicalOperator getOp() { return this.op; } /** * Returns the query to which the operator will be applied */ public QueryExpression getQuery() { return this.query; } /** * Returns a json representation of the query */ @Override public JsonNode toJson() { return getFactory().objectNode().set(op.toString(), query.toJson()); } /** * Parses a unary logical expression using the given object node */ public static UnaryLogicalExpression fromJson(ObjectNode node) { if (node.size() != 1) { throw Error.get(QueryConstants.ERR_INVALID_LOGICAL_EXPRESSION, node.toString()); } String fieldName = node.fieldNames().next(); UnaryLogicalOperator op = UnaryLogicalOperator.fromString(fieldName); if (op == null) { throw Error.get(QueryConstants.ERR_INVALID_LOGICAL_EXPRESSION, node.toString()); } QueryExpression q = QueryExpression.fromJson(node.get(fieldName)); return new UnaryLogicalExpression(op, q); } }