/*
 * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.graal.api.meta;

import java.lang.annotation.*;
import java.lang.reflect.*;

/**
 * Represents a reference to a resolved Java field. Fields, like methods and types, are resolved through
 * {@link ConstantPool constant pools}.
 */
public interface ResolvedJavaField extends JavaField {

    /**
     * Returns the Java language modifiers for this field, as an integer. The {@link Modifier} class should be used to
     * decode the modifiers. Only the {@linkplain Modifier#fieldModifiers() field flags} specified in the JVM
     * specification will be included in the returned mask.
     */
    int getModifiers();

    /**
     * Determines if this field was injected by the VM. Such a field, for example, is not derived from a class file.
     */
    boolean isInternal();

    /**
     * Gets the constant value of this field for a given object, if available.
     *
     * @param receiver object from which this field's value is to be read. This value is ignored if this field is
     *            static.
     * @return the constant value of this field or {@code null} if the constant value is not available
     */
    Constant readConstantValue(Constant receiver);

    /**
     * Gets the current value of this field for a given object, if available.
     *
     * @param receiver object from which this field's value is to be read. This value is ignored if this field is
     *            static.
     * @return the value of this field or {@code null} if the value is not available (e.g., because the field holder is
     *         not yet initialized).
     */
    Constant readValue(Constant receiver);

    /**
     * Returns the {@link ResolvedJavaType} object representing the class or interface that declares this field.
     */
    ResolvedJavaType getDeclaringClass();

    /**
     * Returns the annotation for the specified type of this field, if such an annotation is present.
     *
     * @param annotationClass the Class object corresponding to the annotation type
     * @return this element's annotation for the specified annotation type if present on this field, else {@code null}
     */
    <T extends Annotation> T getAnnotation(Class<T> annotationClass);
}