org.mule.runtime.ast.internal.MethodElementAST Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of mule-extension-ast-loader Show documentation
Mule Extension AST Loader
The newest version!
/*
 * 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.ast.internal;

import static java.util.Optional.empty;
import static java.util.Optional.ofNullable;
import static java.util.stream.Collectors.toList;

import org.mule.runtime.api.util.LazyValue;
import org.mule.runtime.extension.api.annotation.param.ParameterGroup;
import org.mule.runtime.module.extension.api.loader.java.type.AnnotationValueFetcher;
import org.mule.runtime.module.extension.api.loader.java.type.ExtensionParameter;
import org.mule.runtime.module.extension.api.loader.java.type.MethodElement;
import org.mule.runtime.module.extension.api.loader.java.type.Type;

import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

/**
 * {@link MethodElement} implementation which works with the Java AST
 *
 * @since 1.0.0
 */
public class MethodElementAST implements MethodElement {

  private final LazyValue> parameters;
  private final LazyValue> parameterGroups;
  private final ASTUtils astUtils;
  protected final ProcessingEnvironment processingEnvironment;
  protected final ExecutableElement method;

  MethodElementAST(ExecutableElement method, ProcessingEnvironment processingEnvironment) {
    this.method = method;
    this.processingEnvironment = processingEnvironment;
    this.astUtils = new ASTUtils(processingEnvironment);

    parameters = new LazyValue<>(() -> method.getParameters().stream()
        .map(param -> new MethodParameterElementAST(param, processingEnvironment))
        .collect(toList()));
    parameterGroups = new LazyValue<>(() -> getParametersAnnotatedWith(ParameterGroup.class));
  }

  /**
   * @return {@link Optional#empty()}. This implementation doesn't support to return {@link Method}.
   */
  @Override
  public Optional getMethod() {
    return empty();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List getExceptionTypes() {
    return method.getThrownTypes().stream().map(type -> new ASTType(type, processingEnvironment)).collect(toList());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public T getEnclosingType() {
    return (T) new OperationContainerElementAST((TypeElement) method.getEnclosingElement(), processingEnvironment);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List getParameters() {
    return parameters.get();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List getParameterGroups() {
    return parameterGroups.get();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List getParametersAnnotatedWith(Class annotationClass) {
    return getParameters().stream()
        .filter(param -> param.getAnnotation(annotationClass).isPresent())
        .collect(toList());
  }

  /**
  * {@inheritDoc}
  */
  @Override
  public ASTType getReturnType() {
    return new ASTType(method.getReturnType(), processingEnvironment);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public String getName() {
    return method.getSimpleName().toString();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public  Optional getAnnotation(Class annotationClass) {
    return ofNullable(method.getAnnotation(annotationClass));
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public  Optional> getValueFromAnnotation(Class annotationClass) {
    return Optional.ofNullable(astUtils.fromAnnotation(annotationClass, method));
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Optional> getDeclaringClass() {
    return empty();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }

    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    MethodElementAST that = (MethodElementAST) o;

    return Objects.equals(that.method, this.method);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public int hashCode() {
    return method.hashCode();
  }

  @Override
  public Optional getElement() {
    return Optional.of(method);
  }
}