/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * Licensed 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 com.mongodb.internal.validator;

import org.bson.FieldNameValidator;

import java.util.Map;

A field name validator that serves as a root validator for a map of validators that are applied to child fields.  Note that instances of
this class can be nested to achieve a wide variety of validation behaviors.
This class should not be considered a part of the public API.
/**
 * A field name validator that serves as a root validator for a map of validators that are applied to child fields.  Note that instances of
 * this class can be nested to achieve a wide variety of validation behaviors.
 *
 * <p>This class should not be considered a part of the public API.</p>
 */
public class MappedFieldNameValidator implements FieldNameValidator {
    private final FieldNameValidator defaultValidator;
    private final Map<String, FieldNameValidator> fieldNameToValidatorMap;

    
The default validator will be use to validate all fields whose names are not contained int the fieldNameToValidator map.  The map is
used to apply different validators to fields with specific names.
Params:
defaultValidator –        the validator to use for any fields not matching any field name in the map
fieldNameToValidatorMap – a map from field name to FieldNameValidator/**
     * The default validator will be use to validate all fields whose names are not contained int the fieldNameToValidator map.  The map is
     * used to apply different validators to fields with specific names.
     *
     * @param defaultValidator        the validator to use for any fields not matching any field name in the map
     * @param fieldNameToValidatorMap a map from field name to FieldNameValidator
     */
    public MappedFieldNameValidator(final FieldNameValidator defaultValidator,
                                    final Map<String, FieldNameValidator> fieldNameToValidatorMap) {
        this.defaultValidator = defaultValidator;
        this.fieldNameToValidatorMap = fieldNameToValidatorMap;
    }

    @Override
    public boolean validate(final String fieldName) {
        return defaultValidator.validate(fieldName);
    }

    @Override
    public FieldNameValidator getValidatorForField(final String fieldName) {
        if (fieldNameToValidatorMap.containsKey(fieldName)) {
            return fieldNameToValidatorMap.get(fieldName);
        } else {
            return defaultValidator;
        }
    }
}