/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.config.spring.parsers.processors;

import org.mule.runtime.config.spring.parsers.PreProcessor;
import org.mule.runtime.config.spring.parsers.assembly.configuration.PropertyConfiguration;
import org.mule.runtime.config.spring.util.SpringXMLUtils;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;

/**
 * Throws an exception if any of the disallowed attributes (after translation) is present. Designed to cooperates with
 * {@link org.mule.runtime.config.spring.parsers.delegate.AbstractSerialDelegatingDefinitionParser#addHandledException(Class)}
 */
public class BlockAttribute implements PreProcessor {

  private Set<String> disallowed;

  public BlockAttribute(String disallowed) {
    this(new String[] {disallowed});
  }

  public BlockAttribute(String[] disallowed) {
    this.disallowed = new HashSet<String>(Arrays.asList(disallowed));
  }

  public void preProcess(PropertyConfiguration config, Element element) {
    NamedNodeMap attributes = element.getAttributes();
    for (int i = 0; i < attributes.getLength(); i++) {
      String alias = SpringXMLUtils.attributeName((Attr) attributes.item(i));
      String name = config.translateName(alias);
      if (disallowed.contains(name)) {
        throw new BlockAttributeException("Attribute " + alias + " is not allowed here.");
      }
    }
  }

  public static class BlockAttributeException extends IllegalStateException {

    BlockAttributeException(String message) {
      super(message);
    }
  }
}