/*
 * @(#)ExecutableElement.java	1.4 06/07/11
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.lang.model.element;

import java.util.List;
import javax.lang.model.util.Types;
import javax.lang.model.type.*;

/**
 * Represents a method, constructor, or initializer (static or
 * instance) of a class or interface, including annotation type
 * elements.
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ahé
 * @version 1.4 06/07/11
 * @see ExecutableType
 * @since 1.6
 */
public interface ExecutableElement extends Element {
    /**
     * Returns the formal type parameters of this executable
     * in declaration order.
     *
     * @return the formal type parameters, or an empty list
     * if there are none
     */
    List<? extends TypeParameterElement> getTypeParameters();

    /**
     * Returns the return type of this executable.
     * Returns a {@link NoType} with kind {@link TypeKind#VOID VOID}
     * if this executable is not a method, or is a method that does not
     * return a value.
     *
     * @return the return type of this executable
     */
    TypeMirror getReturnType();

    /**
     * Returns the formal parameters of this executable.
     * They are returned in declaration order.
     *
     * @return the formal parameters,
     * or an empty list if there are none
     */
    List<? extends VariableElement> getParameters();

    /**
     * Returns {@code true} if this method or constructor accepts a variable
     * number of arguments and returns {@code false} otherwise.
     *
     * @return {@code true} if this method or constructor accepts a variable
     * number of arguments and {@code false} otherwise
     */
    boolean isVarArgs();

    /**
     * Returns the exceptions and other throwables listed in this
     * method or constructor's {@code throws} clause in declaration
     * order.
     *
     * @return the exceptions and other throwables listed in the
     * {@code throws} clause, or an empty list if there are none
     */
    List<? extends TypeMirror> getThrownTypes();

    /**
     * Returns the default value if this executable is an annotation
     * type element.  Returns {@code null} if this method is not an
     * annotation type element, or if it is an annotation type element
     * with no default value.
     *
     * @return the default value, or {@code null} if none
     */
    AnnotationValue getDefaultValue();
}