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package com.fasterxml.jackson.databind.introspect;

import java.lang.annotation.Annotation;
import java.lang.reflect.Member;
import java.util.Collections;

import com.fasterxml.jackson.databind.util.ClassUtil;

/**
 * Intermediate base class for annotated entities that are members of
 * a class; fields, methods and constructors. This is a superset
 * of things that can represent logical properties as it contains
 * constructors in addition to fields and methods.
 * 
 * @author tatu
 */
public abstract class AnnotatedMember
    extends Annotated
    implements java.io.Serializable
{
    private static final long serialVersionUID = 7364428299211355871L;

    // Transient since information not needed after construction, so
    // no need to persist
    protected final transient AnnotationMap _annotations;

    protected AnnotatedMember(AnnotationMap annotations) {
        super();
        _annotations = annotations;
    }

    public abstract Class getDeclaringClass();

    public abstract Member getMember();

    @Override
    public Iterable annotations() {
        if (_annotations == null) {
            return Collections.emptyList();
        }
        return _annotations.annotations();
    }
    
    @Override
    protected AnnotationMap getAllAnnotations() {
        return _annotations;
    }

    /**
     * Method called to override an annotation, usually due to a mix-in
     * annotation masking or overriding an annotation 'real' constructor
     * has.
     */
    public final void addOrOverride(Annotation a) {
        _annotations.add(a);
    }

    /**
     * Method called to augment annotations, by adding specified
     * annotation if and only if it is not yet present in the
     * annotation map we have.
     */
    public final void addIfNotPresent(Annotation a) {
        _annotations.addIfNotPresent(a);
    }
    
    /**
     * Method that can be called to modify access rights, by calling
     * {@link java.lang.reflect.AccessibleObject#setAccessible} on
     * the underlying annotated element.
     */
    public final void fixAccess() {
        ClassUtil.checkAndFixAccess(getMember());
    }

    /**
     * Optional method that can be used to assign value of
     * this member on given object, if this is a supported
     * operation for member type.
     *
     * This is implemented for fields and single-argument
     * member methods; but not for constructor parameters or
     * other types of methods (like static methods)
     */
    public abstract void setValue(Object pojo, Object value)
        throws UnsupportedOperationException, IllegalArgumentException;

    /**
     * Optional method that can be used to access the value of
     * this member on given object, if this is a supported
     * operation for member type.
     *
     * This is implemented for fields and no-argument
     * member methods; but not for constructor parameters or
     * other types of methods (like static methods)
     */
    public abstract Object getValue(Object pojo)
        throws UnsupportedOperationException, IllegalArgumentException;
}