content: /**
   * Copyright (C) 2010-2016 eBusiness Information, Excilys Group
   * Copyright (C) 2016-2020 the AndroidAnnotations project
   *
   * 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.androidannotations.internal.core.handler;
  
  import javax.lang.model.element.Element;
  import javax.lang.model.element.ExecutableElement;
  import javax.lang.model.element.TypeElement;
  import javax.lang.model.type.TypeMirror;
  
  import org.androidannotations.AndroidAnnotationsEnvironment;
  import org.androidannotations.ElementValidation;
  import org.androidannotations.handler.BaseAnnotationHandler;
  import org.androidannotations.helper.CanonicalNameConstants;
  import org.androidannotations.helper.IdValidatorHelper;
  import org.androidannotations.holder.EComponentWithViewSupportHolder;
  import org.androidannotations.rclass.IRClass;
  
  public abstract class AbstractPageChangeHandler extends BaseAnnotationHandler<EComponentWithViewSupportHolder> {
  	public AbstractPageChangeHandler(Class<?> targetClass, AndroidAnnotationsEnvironment environment) {
  		super(targetClass, environment);
  	}
  
  	@Override
  	protected void validate(Element element, ElementValidation validation) {
  		validatorHelper.enclosingElementHasEnhancedViewSupportAnnotation(element, validation);
  
  		validatorHelper.isViewPagerClassPresent(validation);
  
  		validatorHelper.resIdsExist(element, IRClass.Res.ID, IdValidatorHelper.FallbackStrategy.USE_ELEMENT_NAME, validation);
  
  		validatorHelper.isNotPrivate(element, validation);
  
  		validatorHelper.doesntThrowException(element, validation);
  
  		validatorHelper.returnTypeIsVoid((ExecutableElement) element, validation);
  
  		validatorHelper.uniqueResourceId(element, IRClass.Res.ID, validation);
  	}
  
  	protected boolean hasAddOnPageChangeListenerMethod() {
  		TypeElement viewPager = getProcessingEnvironment().getElementUtils().getTypeElement(CanonicalNameConstants.VIEW_PAGER);
  		TypeElement androidxViewPager = getProcessingEnvironment().getElementUtils().getTypeElement(CanonicalNameConstants.ANDROIDX_VIEW_PAGER);
  		return hasTargetMethod(viewPager, "addOnPageChangeListener") || hasTargetMethod(androidxViewPager, "addOnPageChangeListener");
  	}
  
  	protected boolean isViewPagerParameter(TypeMirror parameterType) {
  		TypeElement viewPagerTypeElement = annotationHelper.typeElementFromQualifiedName(CanonicalNameConstants.VIEW_PAGER);
  		TypeElement androidxViewPagerTypeElement = annotationHelper.typeElementFromQualifiedName(CanonicalNameConstants.ANDROIDX_VIEW_PAGER);
  		TypeMirror viewPagerType = viewPagerTypeElement == null ? null : viewPagerTypeElement.asType();
  		TypeMirror androidxViewPagerType = androidxViewPagerTypeElement == null ? null : androidxViewPagerTypeElement.asType();
  		return viewPagerType != null && annotationHelper.isSubtype(parameterType, viewPagerType) || androidxViewPagerType != null && annotationHelper.isSubtype(parameterType, androidxViewPagerType);
  	}
  }
  