366 lines
12 KiB
Java
366 lines
12 KiB
Java
/*
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* Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.io;
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import java.lang.reflect.Field;
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import java.util.Objects;
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import jdk.internal.reflect.CallerSensitive;
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import jdk.internal.reflect.Reflection;
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import sun.reflect.misc.ReflectUtil;
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/**
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* A description of a Serializable field from a Serializable class. An array
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* of ObjectStreamFields is used to declare the Serializable fields of a class.
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*
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* @author Mike Warres
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* @author Roger Riggs
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* @see ObjectStreamClass
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* @since 1.2
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*/
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public class ObjectStreamField
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implements Comparable<Object>
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{
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/** field name */
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private final String name;
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/** canonical JVM signature of field type, if given */
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private final String signature;
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/** field type (Object.class if unknown non-primitive type) */
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private final Class<?> type;
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/** lazily constructed signature for the type, if no explicit signature */
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private String typeSignature;
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/** whether or not to (de)serialize field values as unshared */
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private final boolean unshared;
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/** corresponding reflective field object, if any */
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private final Field field;
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/** offset of field value in enclosing field group */
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private int offset;
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/**
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* Create a Serializable field with the specified type. This field should
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* be documented with a {@code serialField} tag.
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*
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* @param name the name of the serializable field
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* @param type the {@code Class} object of the serializable field
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*/
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public ObjectStreamField(String name, Class<?> type) {
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this(name, type, false);
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}
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/**
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* Creates an ObjectStreamField representing a serializable field with the
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* given name and type. If unshared is false, values of the represented
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* field are serialized and deserialized in the default manner--if the
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* field is non-primitive, object values are serialized and deserialized as
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* if they had been written and read by calls to writeObject and
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* readObject. If unshared is true, values of the represented field are
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* serialized and deserialized as if they had been written and read by
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* calls to writeUnshared and readUnshared.
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*
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* @param name field name
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* @param type field type
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* @param unshared if false, write/read field values in the same manner
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* as writeObject/readObject; if true, write/read in the same
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* manner as writeUnshared/readUnshared
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* @since 1.4
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*/
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public ObjectStreamField(String name, Class<?> type, boolean unshared) {
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if (name == null) {
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throw new NullPointerException();
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}
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this.name = name;
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// Android-changed: added null check. Javadoc tells nothing about it, but
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// subsequent calls to methods like getSignature() will throw NPE. Prior to
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// OpenJDK 17 NPE was thrown during signature field initialization, which
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// is lazy now.
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// this.type = type;
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this.type = Objects.requireNonNull(type);
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this.unshared = unshared;
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this.field = null;
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this.signature = null;
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}
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/**
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* Creates an ObjectStreamField representing a field with the given name,
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* signature and unshared setting.
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*/
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ObjectStreamField(String name, String signature, boolean unshared) {
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if (name == null) {
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throw new NullPointerException();
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}
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this.name = name;
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this.signature = signature.intern();
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this.unshared = unshared;
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this.field = null;
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type = switch (signature.charAt(0)) {
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case 'Z' -> Boolean.TYPE;
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case 'B' -> Byte.TYPE;
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case 'C' -> Character.TYPE;
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case 'S' -> Short.TYPE;
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case 'I' -> Integer.TYPE;
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case 'J' -> Long.TYPE;
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case 'F' -> Float.TYPE;
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case 'D' -> Double.TYPE;
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case 'L', '[' -> Object.class;
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default -> throw new IllegalArgumentException("illegal signature");
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};
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}
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/**
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* Returns JVM type signature for given primitive.
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*/
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private static String getPrimitiveSignature(Class<?> cl) {
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if (cl == Integer.TYPE)
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return "I";
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else if (cl == Byte.TYPE)
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return "B";
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else if (cl == Long.TYPE)
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return "J";
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else if (cl == Float.TYPE)
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return "F";
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else if (cl == Double.TYPE)
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return "D";
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else if (cl == Short.TYPE)
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return "S";
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else if (cl == Character.TYPE)
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return "C";
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else if (cl == Boolean.TYPE)
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return "Z";
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else if (cl == Void.TYPE)
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return "V";
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else
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throw new InternalError();
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}
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/**
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* Returns JVM type signature for given class.
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*/
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static String getClassSignature(Class<?> cl) {
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if (cl.isPrimitive()) {
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return getPrimitiveSignature(cl);
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} else {
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return appendClassSignature(new StringBuilder(), cl).toString();
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}
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}
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static StringBuilder appendClassSignature(StringBuilder sbuf, Class<?> cl) {
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while (cl.isArray()) {
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sbuf.append('[');
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cl = cl.getComponentType();
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}
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if (cl.isPrimitive()) {
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sbuf.append(getPrimitiveSignature(cl));
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} else {
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sbuf.append('L').append(cl.getName().replace('.', '/')).append(';');
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}
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return sbuf;
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}
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/**
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* Creates an ObjectStreamField representing the given field with the
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* specified unshared setting. For compatibility with the behavior of
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* earlier serialization implementations, a "showType" parameter is
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* necessary to govern whether or not a getType() call on this
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* ObjectStreamField (if non-primitive) will return Object.class (as
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* opposed to a more specific reference type).
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*/
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ObjectStreamField(Field field, boolean unshared, boolean showType) {
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this.field = field;
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this.unshared = unshared;
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name = field.getName();
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Class<?> ftype = field.getType();
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type = (showType || ftype.isPrimitive()) ? ftype : Object.class;
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signature = getClassSignature(ftype).intern();
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}
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/**
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* Get the name of this field.
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*
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* @return a {@code String} representing the name of the serializable
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* field
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*/
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public String getName() {
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return name;
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}
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/**
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* Get the type of the field. If the type is non-primitive and this
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* {@code ObjectStreamField} was obtained from a deserialized {@link
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* ObjectStreamClass} instance, then {@code Object.class} is returned.
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* Otherwise, the {@code Class} object for the type of the field is
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* returned.
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*
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* @return a {@code Class} object representing the type of the
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* serializable field
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*/
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@SuppressWarnings("removal")
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@CallerSensitive
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public Class<?> getType() {
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// BEGIN Android-removed: Security manager is always null on Android.
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/*
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if (System.getSecurityManager() != null) {
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Class<?> caller = Reflection.getCallerClass();
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if (ReflectUtil.needsPackageAccessCheck(caller.getClassLoader(), type.getClassLoader())) {
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ReflectUtil.checkPackageAccess(type);
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}
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}
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*/
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// END Android-removed: Security manager is always null on Android.
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return type;
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}
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/**
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* Returns character encoding of field type. The encoding is as follows:
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* <blockquote><pre>
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* B byte
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* C char
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* D double
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* F float
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* I int
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* J long
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* L class or interface
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* S short
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* Z boolean
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* [ array
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* </pre></blockquote>
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*
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* @return the typecode of the serializable field
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*/
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// REMIND: deprecate?
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public char getTypeCode() {
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return getSignature().charAt(0);
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}
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/**
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* Return the JVM type signature.
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*
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* @return null if this field has a primitive type.
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*/
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// REMIND: deprecate?
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public String getTypeString() {
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return isPrimitive() ? null : getSignature();
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}
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/**
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* Offset of field within instance data.
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*
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* @return the offset of this field
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* @see #setOffset
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*/
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// REMIND: deprecate?
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public int getOffset() {
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return offset;
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}
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/**
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* Offset within instance data.
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*
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* @param offset the offset of the field
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* @see #getOffset
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*/
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// REMIND: deprecate?
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protected void setOffset(int offset) {
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this.offset = offset;
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}
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/**
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* Return true if this field has a primitive type.
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*
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* @return true if and only if this field corresponds to a primitive type
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*/
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// REMIND: deprecate?
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public boolean isPrimitive() {
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char tcode = getTypeCode();
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return ((tcode != 'L') && (tcode != '['));
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}
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/**
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* Returns boolean value indicating whether or not the serializable field
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* represented by this ObjectStreamField instance is unshared.
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*
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* @return {@code true} if this field is unshared
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*
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* @since 1.4
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*/
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public boolean isUnshared() {
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return unshared;
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}
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/**
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* Compare this field with another {@code ObjectStreamField}. Return
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* -1 if this is smaller, 0 if equal, 1 if greater. Types that are
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* primitives are "smaller" than object types. If equal, the field names
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* are compared.
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*/
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// REMIND: deprecate?
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public int compareTo(Object obj) {
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ObjectStreamField other = (ObjectStreamField) obj;
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boolean isPrim = isPrimitive();
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if (isPrim != other.isPrimitive()) {
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return isPrim ? -1 : 1;
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}
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return name.compareTo(other.name);
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}
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/**
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* Return a string that describes this field.
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*/
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public String toString() {
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return getSignature() + ' ' + name;
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}
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/**
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* Returns field represented by this ObjectStreamField, or null if
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* ObjectStreamField is not associated with an actual field.
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*/
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Field getField() {
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return field;
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}
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/**
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* Returns JVM type signature of field (similar to getTypeString, except
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* that signature strings are returned for primitive fields as well).
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*/
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String getSignature() {
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if (signature != null) {
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return signature;
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}
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String sig = typeSignature;
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// This lazy calculation is safe since signature can be null iff one
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// of the public constructors are used, in which case type is always
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// initialized to the exact type we want the signature to represent.
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if (sig == null) {
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typeSignature = sig = getClassSignature(type).intern();
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}
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return sig;
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}
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}
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