log4j-catalog/log4j-catalog-api/src/main/java/org/apache/logging/log4j/catalog/api/plugins/EnumConstraint.java

/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * 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 org.apache.logging.log4j.catalog.api.plugins;

import java.util.Arrays;

import org.apache.logging.log4j.catalog.api.ConstraintType;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import static org.apache.logging.log4j.catalog.api.util.StringUtils.appendNewline;
import static org.apache.logging.log4j.catalog.api.util.StringUtils.isBlank;

/**
 * Performs a comparison to verify the value is in the list of acceptable values.
 */
@Plugin(name = "enum", category = ConstraintType.CATEGORY)
public class EnumConstraint implements ConstraintType {

    @Override
    public void validate(boolean isRequestContext, String name, String value, String enums, StringBuilder error) {
        if (!isBlank(enums) && !isBlank(value)) {
            boolean result = Arrays.asList(enums.trim().split("\\s*,\\s*")).contains(value);
            if (!result) {
                appendNewline(error);
                if (isRequestContext) {
                    error.append("ThreadContext key ");
                }
                error.append(name).append(" does not match one of the values: ").append(enums);
            }
        }
    }
}