# BooleanValidator.java

    /*
     * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     * WSO2 Inc. licenses this file to you under the Apache License,
     * Version 2.0 (the "License"); you may not use this file except
     * in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing,
     * software distributed under the License is distributed on an
     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     * KIND, either express or implied. See the License for the
     * specific language governing permissions and limitations
     * under the License.
     */

    package org.apache.synapse.commons.json.jsonprocessor.validators;

    import com.google.gson.JsonArray;
    import com.google.gson.JsonObject;
    import com.google.gson.JsonPrimitive;
    import org.apache.synapse.commons.json.jsonprocessor.constants.ValidatorConstants;
    import org.apache.synapse.commons.json.jsonprocessor.exceptions.ParserException;
    import org.apache.synapse.commons.json.jsonprocessor.exceptions.ValidatorException;
    import org.apache.synapse.commons.json.jsonprocessor.utils.DataTypeConverter;

    /**
     * This class validate boolean values against a given schema.
     */
    public class BooleanValidator {

        // Use without instantiating.
        private BooleanValidator() {
        }

        /**
         * Validate a boolean string according to a given schema.
         *
         * @param inputObject json schema.
         * @param value       boolean string.
         * @return JsonPrimitive contains the parsed boolean.
         * @throws ValidatorException exception occurs in validation.
         * @throws ParserException    exception occurs when parsing.
         */
        public static JsonPrimitive validateBoolean(JsonObject inputObject, String value) throws ValidatorException,
                ParserException {
            if (value == null) {
                throw new ValidatorException("Received null input to be validated with : " +
                        inputObject.toString() + ". Expected a boolean but found null");
            }
            Boolean parsedValue = DataTypeConverter.convertToBoolean(value);
            // Enum validations
            if (inputObject.has(ValidatorConstants.ENUM)) {
                JsonArray enumElements = inputObject.getAsJsonArray(ValidatorConstants.ENUM);
                if (enumElements.size() > 0 && !enumElements.contains(new JsonPrimitive(parsedValue))) {
                    throw new ValidatorException("input \"" + value + "\" not contains any " +
                            "element from the enum  : " + enumElements.toString());
                }
            }
            //Const validation
            if (inputObject.has(ValidatorConstants.CONST) && !parsedValue.equals(inputObject.getAsJsonPrimitive
                    (ValidatorConstants.CONST).getAsBoolean())) {
                throw new ValidatorException("String \"" + value + "\" is not equal to the const" +
                        " value");
            }
            return new JsonPrimitive(parsedValue);
        }
    }