/*
    * 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 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.*;
  import static org.apache.logging.log4j.catalog.api.util.StringUtils.appendNewline;
  
  /**
   *
   */
  @Plugin(name = "pattern", category = ConstraintType.CATEGORY)
  public class PatternConstraint implements ConstraintType {
  
      @Override
      public void validate(boolean isRequestContext, String name, String value, String pattern, StringBuilder error) {
          if (!isBlank(pattern) && !isBlank(value)) {
              if (!value.matches(pattern)) {
                  appendNewline(error);
                  if (isRequestContext) {
                      error.append("ThreadContext key ");
                  }
                  error.append(name).append(" does not match pattern ").append(pattern);
              }
          }
      }
  }