RenameCollectionParametersValidator.java

/*
 * Copyright 2025 Flamingock (https://www.flamingock.io)
 *
 * 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 io.flamingock.template.mongodb.validation;

import io.flamingock.api.template.TemplatePayloadValidationError;
import io.flamingock.template.mongodb.mapper.RenameCollectionOptionsMapper;
import io.flamingock.template.mongodb.model.MongoOperation;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class RenameCollectionParametersValidator implements OperationValidator {

    private static final Set<String> RECOGNIZED_KEYS = new HashSet<>(Arrays.asList("target", "options"));

    @Override
    public List<TemplatePayloadValidationError> validate(MongoOperation operation) {
        List<TemplatePayloadValidationError> errors = new ArrayList<>();
        Map<String, Object> params = operation.getParameters();

        if (params == null || !params.containsKey("target")) {
            errors.add(new TemplatePayloadValidationError("parameters.target",
                    "RenameCollection operation requires 'target' parameter"));
            return errors;
        }

        Object target = params.get("target");
        if (target == null || (target instanceof String && ((String) target).trim().isEmpty())) {
            errors.add(new TemplatePayloadValidationError("parameters.target",
                    "'target' cannot be null or empty"));
        } else if (target instanceof String) {
            String targetStr = (String) target;
            if (targetStr.contains("$")) {
                errors.add(new TemplatePayloadValidationError("parameters.target",
                        "'target' collection name cannot contain '$': " + targetStr));
            }
            if (targetStr.contains("\0")) {
                errors.add(new TemplatePayloadValidationError("parameters.target",
                        "'target' collection name cannot contain null character"));
            }
        }

        Object options = params.get("options");
        if (options != null && !(options instanceof Map)) {
            errors.add(new TemplatePayloadValidationError("parameters.options",
                    "'options' must be a document"));
        } else if (options instanceof Map) {
            @SuppressWarnings("unchecked")
            Map<String, Object> optionsMap = (Map<String, Object>) options;
            errors.addAll(OperationValidator.checkUnrecognizedOptionKeys(
                    optionsMap, RenameCollectionOptionsMapper.RECOGNIZED_KEYS, "RenameCollection"));
        }

        errors.addAll(OperationValidator.checkUnrecognizedKeys(params, RECOGNIZED_KEYS, "RenameCollection"));

        return errors;
    }
}