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jax-doclets allows you to generate JavaDoc documentation for specific Java annotation-based extensions.

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/*
    Copyright 2009 Lunatech Research
    
    This file is part of jax-doclets.

    jax-doclets is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    jax-doclets is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with jax-doclets.  If not, see .
 */
package com.lunatech.doclets.jax.jaxb.model;

import com.sun.javadoc.AnnotationDesc;
import com.sun.javadoc.ProgramElementDoc;
import com.sun.javadoc.AnnotationDesc.ElementValuePair;

public abstract class Node extends JAXBMember {

  protected Node(JAXBClass klass, ProgramElementDoc property, String name, AnnotationDesc xmlAttributeAnnotation) {
    super(klass, property, name, xmlAttributeAnnotation);
  }
  
  public boolean isRequired(){
    ElementValuePair elementValuePair = getElementAttribute("required");
    if(elementValuePair != null){
      return "true".equalsIgnoreCase(elementValuePair.value().toString());
    }
    return false;
  }
  
  protected ElementValuePair getElementAttribute(String attributeName){
    if(xmlAnnotation != null && xmlAnnotation.elementValues() != null){
      for (ElementValuePair elementValuePair : xmlAnnotation.elementValues()) {
        if(attributeName.equals(elementValuePair.element().name())){
          return elementValuePair;
        }
      }
    }
    return null;
  }
  
}