/**
    * Copyright 2005-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.krad.datadictionary.validation.constraint;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.config.property.ConfigurationService;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.uif.UifConstants;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Pattern;
  
  /**
   * Pattern for matching any character in the given list (String)
   * 
   * 
   */
  public class CharsetPatternConstraint extends ValidCharactersPatternConstraint {
      protected String validChars;
  
      /**
       * @return String containing all valid chars for this charset
       */
      public String getValidChars() {
          return validChars;
      }
  
      /**
       * @param validChars for this charset
       */
      public void setValidChars(String validChars) {
          if (StringUtils.isEmpty(validChars)) {
              throw new IllegalArgumentException("invalid (empty) validChars");
          }
  
          this.validChars = validChars;
      }
  
  
      /**
       * Escapes every special character I could think of, to limit potential misuse of this pattern.
       * 
       * @see org.kuali.rice.krad.datadictionary.validation.ValidationPattern#getRegexString()
       */
      protected String getRegexString() {
          if (StringUtils.isEmpty(validChars)) {
              throw new IllegalStateException("validChars is empty");
          }
  
          // filter out and escape chars which would confuse the pattern-matcher
          Pattern filteringChars = Pattern.compile("([\\-\\[\\]\\{\\}\\$\\.\\^\\(\\)\\*\\&\\|])");
          String filteredChars = filteringChars.matcher(validChars).replaceAll("\\\\$1");
  
          StringBuffer regexString = new StringBuffer("[");
          regexString.append(filteredChars);
          if (filteredChars.endsWith("\\")) {
              regexString.append("\\");
          }
          regexString.append("]");
  
          return regexString.toString();
      }
  
  	/**
  	 * 
  	 * @see org.kuali.rice.krad.datadictionary.validation.constraint.BaseConstraint#getLabelKey()
  	 */
  	@Override
  	public String getLabelKey() {
  		String labelKey = super.getLabelKey();
  		if (StringUtils.isNotEmpty(labelKey)) {
  			return labelKey;
  		}
  		return (UifConstants.Messages.VALIDATION_MSG_KEY_PREFIX + "charsetPattern");
  	}
  
      /**
       * Parameters to be used in the string retrieved by this constraint's labelKey
       * @return the validationMessageParams
       */
      public List<String> getValidationMessageParams() {
          if(validationMessageParams == null){
              validationMessageParams = new ArrayList<String>();
              if (StringUtils.isNotBlank(validChars)) {
                  validationMessageParams.add(validChars);
             }
             
         }
         return this.validationMessageParams;
     }
 
 }