Java example source code file (ObjectStreamClass_1_3_1.java)
The ObjectStreamClass_1_3_1.java Java example source code/*
* Copyright (c) 2001, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
/*
* Licensed Materials - Property of IBM
* RMI-IIOP v1.0
* Copyright IBM Corp. 1998 1999 All Rights Reserved
*
*/
package com.sun.corba.se.impl.orbutil;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.DigestOutputStream;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedAction;
import java.lang.reflect.Modifier;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Constructor;
import java.lang.reflect.Proxy;
import java.lang.reflect.InvocationTargetException;
import java.io.IOException;
import java.io.DataOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.InvalidClassException;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Hashtable;
import org.omg.CORBA.ValueMember;
import com.sun.corba.se.impl.io.ValueUtility;
import com.sun.corba.se.impl.io.ObjectStreamClass;
/**
* This is duplicated here to preserve the JDK 1.3.1FCS behavior
* of calculating the OMG hash code incorrectly when serialPersistentFields
* is used, but some of the fields no longer exist in the class itself.
*
* We have to duplicate it since we aren't allowed to modify the
* com.sun.corba.se.impl.io version further, and can't make it
* public outside of its package for security reasons.
*/
/**
* A ObjectStreamClass_1_3_1 describes a class that can be serialized to a stream
* or a class that was serialized to a stream. It contains the name
* and the serialVersionUID of the class.
* <br>
* The ObjectStreamClass_1_3_1 for a specific class loaded in this Java VM can
* be found using the lookup method.
*
* @author Roger Riggs
* @since JDK1.1
*/
public class ObjectStreamClass_1_3_1 implements java.io.Serializable {
public static final long kDefaultUID = -1;
private static Object noArgsList[] = {};
private static Class noTypesList[] = {};
private static Hashtable translatedFields;
/** Find the descriptor for a class that can be serialized. Null
* is returned if the specified class does not implement
* java.io.Serializable or java.io.Externalizable.
*/
static final ObjectStreamClass_1_3_1 lookup(Class cl)
{
ObjectStreamClass_1_3_1 desc = lookupInternal(cl);
if (desc.isSerializable() || desc.isExternalizable())
return desc;
return null;
}
/*
* Find the class descriptor for the specified class.
* Package access only so it can be called from ObjectIn/OutStream.
*/
static ObjectStreamClass_1_3_1 lookupInternal(Class cl)
{
/* Synchronize on the hashtable so no two threads will do
* this at the same time.
*/
ObjectStreamClass_1_3_1 desc = null;
synchronized (descriptorFor) {
/* Find the matching descriptor if it already known */
desc = findDescriptorFor(cl);
if (desc != null) {
return desc;
}
/* Check if it's serializable */
boolean serializable = classSerializable.isAssignableFrom(cl);
/* If the class is only Serializable,
* lookup the descriptor for the superclass.
*/
ObjectStreamClass_1_3_1 superdesc = null;
if (serializable) {
Class superclass = cl.getSuperclass();
if (superclass != null)
superdesc = lookup(superclass);
}
/* Check if its' externalizable.
* If it's Externalizable, clear the serializable flag.
* Only one or the other may be set in the protocol.
*/
boolean externalizable = false;
if (serializable) {
externalizable =
((superdesc != null) && superdesc.isExternalizable()) ||
classExternalizable.isAssignableFrom(cl);
if (externalizable) {
serializable = false;
}
}
/* Create a new version descriptor,
* it put itself in the known table.
*/
desc = new ObjectStreamClass_1_3_1(cl, superdesc,
serializable, externalizable);
}
desc.init();
return desc;
}
/**
* The name of the class described by this descriptor.
*/
public final String getName() {
return name;
}
/**
* Return the serialVersionUID for this class.
* The serialVersionUID defines a set of classes all with the same name
* that have evolved from a common root class and agree to be serialized
* and deserialized using a common format.
*/
public static final long getSerialVersionUID( java.lang.Class clazz) {
ObjectStreamClass_1_3_1 theosc = ObjectStreamClass_1_3_1.lookup( clazz );
if( theosc != null )
{
return theosc.getSerialVersionUID( );
}
return 0;
}
/**
* Return the serialVersionUID for this class.
* The serialVersionUID defines a set of classes all with the same name
* that have evolved from a common root class and agree to be serialized
* and deserialized using a common format.
*/
public final long getSerialVersionUID() {
return suid;
}
/**
* Return the serialVersionUID string for this class.
* The serialVersionUID defines a set of classes all with the same name
* that have evolved from a common root class and agree to be serialized
* and deserialized using a common format.
*/
public final String getSerialVersionUIDStr() {
if (suidStr == null)
suidStr = Long.toHexString(suid).toUpperCase();
return suidStr;
}
/**
* Return the actual (computed) serialVersionUID for this class.
*/
public static final long getActualSerialVersionUID( java.lang.Class clazz )
{
ObjectStreamClass_1_3_1 theosc = ObjectStreamClass_1_3_1.lookup( clazz );
if( theosc != null )
{
return theosc.getActualSerialVersionUID( );
}
return 0;
}
/**
* Return the actual (computed) serialVersionUID for this class.
*/
public final long getActualSerialVersionUID() {
return actualSuid;
}
/**
* Return the actual (computed) serialVersionUID for this class.
*/
public final String getActualSerialVersionUIDStr() {
if (actualSuidStr == null)
actualSuidStr = Long.toHexString(actualSuid).toUpperCase();
return actualSuidStr;
}
/**
* Return the class in the local VM that this version is mapped to.
* Null is returned if there is no corresponding local class.
*/
public final Class forClass() {
return ofClass;
}
/**
* Return an array of the fields of this serializable class.
* @return an array containing an element for each persistent
* field of this class. Returns an array of length zero if
* there are no fields.
* @since JDK1.2
*/
public ObjectStreamField[] getFields() {
// Return a copy so the caller can't change the fields.
if (fields.length > 0) {
ObjectStreamField[] dup = new ObjectStreamField[fields.length];
System.arraycopy(fields, 0, dup, 0, fields.length);
return dup;
} else {
return fields;
}
}
public boolean hasField(ValueMember field){
for (int i = 0; i < fields.length; i++){
try{
if (fields[i].getName().equals(field.name)) {
if (fields[i].getSignature().equals(ValueUtility.getSignature(field)))
return true;
}
}
catch(Throwable t){}
}
return false;
}
/* Avoid unnecessary allocations. */
final ObjectStreamField[] getFieldsNoCopy() {
return fields;
}
/**
* Get the field of this class by name.
* @return The ObjectStreamField object of the named field or null if there
* is no such named field.
*/
public final ObjectStreamField getField(String name) {
/* Binary search of fields by name.
*/
for (int i = fields.length-1; i >= 0; i--) {
if (name.equals(fields[i].getName())) {
return fields[i];
}
}
return null;
}
public Serializable writeReplace(Serializable value) {
if (writeReplaceObjectMethod != null) {
try {
return (Serializable) writeReplaceObjectMethod.invoke(value,noArgsList);
}
catch(Throwable t) {
throw new RuntimeException(t.getMessage());
}
}
else return value;
}
public Object readResolve(Object value) {
if (readResolveObjectMethod != null) {
try {
return readResolveObjectMethod.invoke(value,noArgsList);
}
catch(Throwable t) {
throw new RuntimeException(t.getMessage());
}
}
else return value;
}
/**
* Return a string describing this ObjectStreamClass_1_3_1.
*/
public final String toString() {
StringBuffer sb = new StringBuffer();
sb.append(name);
sb.append(": static final long serialVersionUID = ");
sb.append(Long.toString(suid));
sb.append("L;");
return sb.toString();
}
/*
* Create a new ObjectStreamClass_1_3_1 from a loaded class.
* Don't call this directly, call lookup instead.
*/
private ObjectStreamClass_1_3_1(java.lang.Class cl, ObjectStreamClass_1_3_1 superdesc,
boolean serial, boolean extern)
{
ofClass = cl; /* created from this class */
if (Proxy.isProxyClass(cl)) {
forProxyClass = true;
}
name = cl.getName();
superclass = superdesc;
serializable = serial;
if (!forProxyClass) {
// proxy classes are never externalizable
externalizable = extern;
}
/*
* Enter this class in the table of known descriptors.
* Otherwise, when the fields are read it may recurse
* trying to find the descriptor for itself.
*/
insertDescriptorFor(this);
/*
* The remainder of initialization occurs in init(), which is called
* after the lock on the global class descriptor table has been
* released.
*/
}
/*
* Initialize class descriptor. This method is only invoked on class
* descriptors created via calls to lookupInternal(). This method is kept
* separate from the ObjectStreamClass_1_3_1 constructor so that lookupInternal
* does not have to hold onto a global class descriptor table lock while the
* class descriptor is being initialized (see bug 4165204).
*/
private void init() {
synchronized (lock) {
final Class cl = ofClass;
if (fields != null) // already initialized
return;
if (!serializable ||
externalizable ||
forProxyClass ||
name.equals("java.lang.String")) {
fields = NO_FIELDS;
} else if (serializable) {
/* Ask for permission to override field access checks.
*/
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
/* Fill in the list of persistent fields.
* If it is declared, use the declared serialPersistentFields.
* Otherwise, extract the fields from the class itself.
*/
try {
Field pf = cl.getDeclaredField("serialPersistentFields");
// serial bug 7; the serialPersistentFields were not
// being read and stored as Accessible bit was not set
pf.setAccessible(true);
// serial bug 7; need to find if the field is of type
// java.io.ObjectStreamField
java.io.ObjectStreamField[] f =
(java.io.ObjectStreamField[])pf.get(cl);
int mods = pf.getModifiers();
if ((Modifier.isPrivate(mods)) &&
(Modifier.isStatic(mods)) &&
(Modifier.isFinal(mods)))
{
fields = (ObjectStreamField[])translateFields((Object[])pf.get(cl));
}
} catch (NoSuchFieldException e) {
fields = null;
} catch (IllegalAccessException e) {
fields = null;
} catch (IllegalArgumentException e) {
fields = null;
} catch (ClassCastException e) {
/* Thrown if a field serialPersistentField exists
* but it is not of type ObjectStreamField.
*/
fields = null;
}
if (fields == null) {
/* Get all of the declared fields for this
* Class. setAccessible on all fields so they
* can be accessed later. Create a temporary
* ObjectStreamField array to hold each
* non-static, non-transient field. Then copy the
* temporary array into an array of the correct
* size once the number of fields is known.
*/
Field[] actualfields = cl.getDeclaredFields();
int numFields = 0;
ObjectStreamField[] tempFields =
new ObjectStreamField[actualfields.length];
for (int i = 0; i < actualfields.length; i++) {
int modifiers = actualfields[i].getModifiers();
if (!Modifier.isStatic(modifiers) &&
!Modifier.isTransient(modifiers)) {
tempFields[numFields++] =
new ObjectStreamField(actualfields[i]);
}
}
fields = new ObjectStreamField[numFields];
System.arraycopy(tempFields, 0, fields, 0, numFields);
} else {
// For each declared persistent field, look for an actual
// reflected Field. If there is one, make sure it's the correct
// type and cache it in the ObjectStreamClass_1_3_1 for that field.
for (int j = fields.length-1; j >= 0; j--) {
try {
Field reflField = cl.getDeclaredField(fields[j].getName());
if (fields[j].getType() == reflField.getType()) {
// reflField.setAccessible(true);
fields[j].setField(reflField);
}
} catch (NoSuchFieldException e) {
// Nothing to do
}
}
}
return null;
}
});
if (fields.length > 1)
Arrays.sort(fields);
/* Set up field data for use while writing using the API api. */
computeFieldInfo();
}
/* Get the serialVersionUID from the class.
* It uses the access override mechanism so make sure
* the field objects is only used here.
*
* NonSerializable classes have a serialVerisonUID of 0L.
*/
if (isNonSerializable()) {
suid = 0L;
} else {
// Lookup special Serializable members using reflection.
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
if (forProxyClass) {
// proxy classes always have serialVersionUID of 0L
suid = 0L;
} else {
try {
final Field f = cl.getDeclaredField("serialVersionUID");
int mods = f.getModifiers();
// SerialBug 5: static final SUID should be read
if (Modifier.isStatic(mods) &&
Modifier.isFinal(mods) ) {
f.setAccessible(true);
suid = f.getLong(cl);
// get rid of native code
// suid = getSerialVersionUIDField(cl);
// SerialBug 2: should be computed after writeObject
// actualSuid = computeStructuralUID(cl);
} else {
suid = ObjectStreamClass.getSerialVersionUID(cl);
// SerialBug 2: should be computed after writeObject
// actualSuid = computeStructuralUID(cl);
}
} catch (NoSuchFieldException ex) {
suid = ObjectStreamClass.getSerialVersionUID(cl);
// SerialBug 2: should be computed after writeObject
// actualSuid = computeStructuralUID(cl);
} catch (IllegalAccessException ex) {
suid = ObjectStreamClass.getSerialVersionUID(cl);
}
}
try {
writeReplaceObjectMethod = cl.getDeclaredMethod("writeReplace", noTypesList);
if (Modifier.isStatic(writeReplaceObjectMethod.getModifiers())) {
writeReplaceObjectMethod = null;
} else {
writeReplaceObjectMethod.setAccessible(true);
}
} catch (NoSuchMethodException e2) {
}
try {
readResolveObjectMethod = cl.getDeclaredMethod("readResolve", noTypesList);
if (Modifier.isStatic(readResolveObjectMethod.getModifiers())) {
readResolveObjectMethod = null;
} else {
readResolveObjectMethod.setAccessible(true);
}
} catch (NoSuchMethodException e2) {
}
/* Cache lookup of writeObject and readObject for
* Serializable classes. (Do not lookup for
* Externalizable)
*/
if (serializable && !forProxyClass) {
/* Look for the writeObject method
* Set the accessible flag on it here. ObjectOutputStream
* will call it as necessary.
*/
try {
Class[] args = {java.io.ObjectOutputStream.class};
writeObjectMethod = cl.getDeclaredMethod("writeObject", args);
hasWriteObjectMethod = true;
int mods = writeObjectMethod.getModifiers();
// Method must be private and non-static
if (!Modifier.isPrivate(mods) ||
Modifier.isStatic(mods)) {
writeObjectMethod = null;
hasWriteObjectMethod = false;
}
} catch (NoSuchMethodException e) {
}
/* Look for the readObject method
* set the access override and save the reference for
* ObjectInputStream so it can all the method directly.
*/
try {
Class[] args = {java.io.ObjectInputStream.class};
readObjectMethod = cl.getDeclaredMethod("readObject", args);
int mods = readObjectMethod.getModifiers();
// Method must be private and non-static
if (!Modifier.isPrivate(mods) ||
Modifier.isStatic(mods)) {
readObjectMethod = null;
}
} catch (NoSuchMethodException e) {
}
// Compute the structural UID. This must be done after the
// calculation for writeObject. Fixed 4/20/2000, eea1
// SerialBug 2: to have correct value in RepId
}
return null;
}
});
}
actualSuid = computeStructuralUID(this, cl);
}
}
/*
* Create an empty ObjectStreamClass_1_3_1 for a class about to be read.
* This is separate from read so ObjectInputStream can assign the
* wire handle early, before any nested ObjectStreamClass_1_3_1 might
* be read.
*/
ObjectStreamClass_1_3_1(String n, long s) {
name = n;
suid = s;
superclass = null;
}
private static Object[] translateFields(Object objs[])
throws NoSuchFieldException {
try{
java.io.ObjectStreamField fields[] = (java.io.ObjectStreamField[])objs;
Object translation[] = null;
if (translatedFields == null)
translatedFields = new Hashtable();
translation = (Object[])translatedFields.get(fields);
if (translation != null)
return translation;
else {
Class osfClass = com.sun.corba.se.impl.orbutil.ObjectStreamField.class;
translation = (Object[])java.lang.reflect.Array.newInstance(osfClass, objs.length);
Object arg[] = new Object[2];
Class types[] = {String.class, Class.class};
Constructor constructor = osfClass.getDeclaredConstructor(types);
for (int i = fields.length -1; i >= 0; i--){
arg[0] = fields[i].getName();
arg[1] = fields[i].getType();
translation[i] = constructor.newInstance(arg);
}
translatedFields.put(fields, translation);
}
return (Object[])translation;
}
catch(Throwable t){
throw new NoSuchFieldException();
}
}
/* Compare the base class names of streamName and localName.
*
* @return Return true iff the base class name compare.
* @parameter streamName Fully qualified class name.
* @parameter localName Fully qualified class name.
* @parameter pkgSeparator class names use either '.' or '/'.
*
* Only compare base class name to allow package renaming.
*/
static boolean compareClassNames(String streamName,
String localName,
char pkgSeparator) {
/* compare the class names, stripping off package names. */
int streamNameIndex = streamName.lastIndexOf(pkgSeparator);
if (streamNameIndex < 0)
streamNameIndex = 0;
int localNameIndex = localName.lastIndexOf(pkgSeparator);
if (localNameIndex < 0)
localNameIndex = 0;
return streamName.regionMatches(false, streamNameIndex,
localName, localNameIndex,
streamName.length() - streamNameIndex);
}
/*
* Compare the types of two class descriptors.
* They match if they have the same class name and suid
*/
final boolean typeEquals(ObjectStreamClass_1_3_1 other) {
return (suid == other.suid) &&
compareClassNames(name, other.name, '.');
}
/*
* Return the superclass descriptor of this descriptor.
*/
final void setSuperclass(ObjectStreamClass_1_3_1 s) {
superclass = s;
}
/*
* Return the superclass descriptor of this descriptor.
*/
final ObjectStreamClass_1_3_1 getSuperclass() {
return superclass;
}
/*
* Return whether the class has a writeObject method
*/
final boolean hasWriteObject() {
return hasWriteObjectMethod;
}
final boolean isCustomMarshaled() {
return (hasWriteObject() || isExternalizable());
}
/*
* Return true if all instances of 'this' Externalizable class
* are written in block-data mode from the stream that 'this' was read
* from. <p>
*
* In JDK 1.1, all Externalizable instances are not written
* in block-data mode.
* In JDK 1.2, all Externalizable instances, by default, are written
* in block-data mode and the Externalizable instance is terminated with
* tag TC_ENDBLOCKDATA. Change enabled the ability to skip Externalizable
* instances.
*
* IMPLEMENTATION NOTE:
* This should have been a mode maintained per stream; however,
* for compatibility reasons, it was only possible to record
* this change per class. All Externalizable classes within
* a given stream should either have this mode enabled or
* disabled. This is enforced by not allowing the PROTOCOL_VERSION
* of a stream to he changed after any objects have been written.
*
* @see ObjectOutputStream#useProtocolVersion
* @see ObjectStreamConstants#PROTOCOL_VERSION_1
* @see ObjectStreamConstants#PROTOCOL_VERSION_2
*
* @since JDK 1.2
*/
boolean hasExternalizableBlockDataMode() {
return hasExternalizableBlockData;
}
/*
* Return the ObjectStreamClass_1_3_1 of the local class this one is based on.
*/
final ObjectStreamClass_1_3_1 localClassDescriptor() {
return localClassDesc;
}
/*
* Get the Serializability of the class.
*/
boolean isSerializable() {
return serializable;
}
/*
* Get the externalizability of the class.
*/
boolean isExternalizable() {
return externalizable;
}
boolean isNonSerializable() {
return ! (externalizable || serializable);
}
/*
* Calculate the size of the array needed to store primitive data and the
* number of object references to read when reading from the input
* stream.
*/
private void computeFieldInfo() {
primBytes = 0;
objFields = 0;
for (int i = 0; i < fields.length; i++ ) {
switch (fields[i].getTypeCode()) {
case 'B':
case 'Z':
primBytes += 1;
break;
case 'C':
case 'S':
primBytes += 2;
break;
case 'I':
case 'F':
primBytes += 4;
break;
case 'J':
case 'D' :
primBytes += 8;
break;
case 'L':
case '[':
objFields += 1;
break;
}
}
}
private static long computeStructuralUID(ObjectStreamClass_1_3_1 osc, Class cl) {
ByteArrayOutputStream devnull = new ByteArrayOutputStream(512);
long h = 0;
try {
if ((!java.io.Serializable.class.isAssignableFrom(cl)) ||
(cl.isInterface())){
return 0;
}
if (java.io.Externalizable.class.isAssignableFrom(cl)) {
return 1;
}
MessageDigest md = MessageDigest.getInstance("SHA");
DigestOutputStream mdo = new DigestOutputStream(devnull, md);
DataOutputStream data = new DataOutputStream(mdo);
// Get SUID of parent
Class parent = cl.getSuperclass();
if ((parent != null))
// SerialBug 1; acc. to spec the one for
// java.lang.object
// should be computed and put
// && (parent != java.lang.Object.class))
{
//data.writeLong(computeSerialVersionUID(null,parent));
data.writeLong(computeStructuralUID(lookup(parent), parent));
}
if (osc.hasWriteObject())
data.writeInt(2);
else
data.writeInt(1);
/* Sort the field names to get a deterministic order */
// Field[] field = ObjectStreamClass_1_3_1.getDeclaredFields(cl);
ObjectStreamField[] fields = osc.getFields();
// Must make sure that the Field array we allocate
// below is exactly the right size. Bug fix for
// 4397133.
int numNonNullFields = 0;
for (int i = 0; i < fields.length; i++)
if (fields[i].getField() != null)
numNonNullFields++;
Field [] field = new java.lang.reflect.Field[numNonNullFields];
for (int i = 0, fieldNum = 0; i < fields.length; i++) {
if (fields[i].getField() != null) {
field[fieldNum++] = fields[i].getField();
}
}
if (field.length > 1)
Arrays.sort(field, compareMemberByName);
for (int i = 0; i < field.length; i++) {
Field f = field[i];
/* Include in the hash all fields except those that are
* transient
*/
int m = f.getModifiers();
//Serial 6
//if (Modifier.isTransient(m) || Modifier.isStatic(m))
// spec reference 00-01-06.pdf, 1.3.5.6, states non-static
// non-transient, public fields are mapped to Java IDL.
//
// Here's the quote from the first paragraph:
// Java non-static non-transient public fields are mapped to
// OMG IDL public data members, and other Java fields are
// not mapped.
// if (Modifier.isTransient(m) || Modifier.isStatic(m))
// continue;
data.writeUTF(f.getName());
data.writeUTF(getSignature(f.getType()));
}
/* Compute the hash value for this class.
* Use only the first 64 bits of the hash.
*/
data.flush();
byte hasharray[] = md.digest();
// int minimum = Math.min(8, hasharray.length);
// SerialBug 3: SHA computation is wrong; for loop reversed
//for (int i = minimum; i > 0; i--)
for (int i = 0; i < Math.min(8, hasharray.length); i++) {
h += (long)(hasharray[i] & 255) << (i * 8);
}
} catch (IOException ignore) {
/* can't happen, but be deterministic anyway. */
h = -1;
} catch (NoSuchAlgorithmException complain) {
throw new SecurityException(complain.getMessage());
}
return h;
}
/**
* Compute the JVM signature for the class.
*/
static String getSignature(Class clazz) {
String type = null;
if (clazz.isArray()) {
Class cl = clazz;
int dimensions = 0;
while (cl.isArray()) {
dimensions++;
cl = cl.getComponentType();
}
StringBuffer sb = new StringBuffer();
for (int i = 0; i < dimensions; i++) {
sb.append("[");
}
sb.append(getSignature(cl));
type = sb.toString();
} else if (clazz.isPrimitive()) {
if (clazz == Integer.TYPE) {
type = "I";
} else if (clazz == Byte.TYPE) {
type = "B";
} else if (clazz == Long.TYPE) {
type = "J";
} else if (clazz == Float.TYPE) {
type = "F";
} else if (clazz == Double.TYPE) {
type = "D";
} else if (clazz == Short.TYPE) {
type = "S";
} else if (clazz == Character.TYPE) {
type = "C";
} else if (clazz == Boolean.TYPE) {
type = "Z";
} else if (clazz == Void.TYPE) {
type = "V";
}
} else {
type = "L" + clazz.getName().replace('.', '/') + ";";
}
return type;
}
/*
* Compute the JVM method descriptor for the method.
*/
static String getSignature(Method meth) {
StringBuffer sb = new StringBuffer();
sb.append("(");
Class[] params = meth.getParameterTypes(); // avoid clone
for (int j = 0; j < params.length; j++) {
sb.append(getSignature(params[j]));
}
sb.append(")");
sb.append(getSignature(meth.getReturnType()));
return sb.toString();
}
/*
* Compute the JVM constructor descriptor for the constructor.
*/
static String getSignature(Constructor cons) {
StringBuffer sb = new StringBuffer();
sb.append("(");
Class[] params = cons.getParameterTypes(); // avoid clone
for (int j = 0; j < params.length; j++) {
sb.append(getSignature(params[j]));
}
sb.append(")V");
return sb.toString();
}
/*
* Cache of Class -> ClassDescriptor Mappings.
*/
static private ObjectStreamClassEntry[] descriptorFor = new ObjectStreamClassEntry[61];
/*
* findDescriptorFor a Class. This looks in the cache for a
* mapping from Class -> ObjectStreamClass mappings. The hashCode
* of the Class is used for the lookup since the Class is the key.
* The entries are extended from java.lang.ref.SoftReference so the
* gc will be able to free them if needed.
*/
private static ObjectStreamClass_1_3_1 findDescriptorFor(Class cl) {
int hash = cl.hashCode();
int index = (hash & 0x7FFFFFFF) % descriptorFor.length;
ObjectStreamClassEntry e;
ObjectStreamClassEntry prev;
/* Free any initial entries whose refs have been cleared */
while ((e = descriptorFor[index]) != null && e.get() == null) {
descriptorFor[index] = e.next;
}
/* Traverse the chain looking for a descriptor with ofClass == cl.
* unlink entries that are unresolved.
*/
prev = e;
while (e != null ) {
ObjectStreamClass_1_3_1 desc = (ObjectStreamClass_1_3_1)(e.get());
if (desc == null) {
// This entry has been cleared, unlink it
prev.next = e.next;
} else {
if (desc.ofClass == cl)
return desc;
prev = e;
}
e = e.next;
}
return null;
}
/*
* insertDescriptorFor a Class -> ObjectStreamClass_1_3_1 mapping.
*/
private static void insertDescriptorFor(ObjectStreamClass_1_3_1 desc) {
// Make sure not already present
if (findDescriptorFor(desc.ofClass) != null) {
return;
}
int hash = desc.ofClass.hashCode();
int index = (hash & 0x7FFFFFFF) % descriptorFor.length;
ObjectStreamClassEntry e = new ObjectStreamClassEntry(desc);
e.next = descriptorFor[index];
descriptorFor[index] = e;
}
private static Field[] getDeclaredFields(final Class clz) {
return (Field[]) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return clz.getDeclaredFields();
}
});
}
/*
* The name of this descriptor
*/
private String name;
/*
* The descriptor of the supertype.
*/
private ObjectStreamClass_1_3_1 superclass;
/*
* Flags for Serializable and Externalizable.
*/
private boolean serializable;
private boolean externalizable;
/*
* Array of persistent fields of this class, sorted by
* type and name.
*/
private ObjectStreamField[] fields;
/*
* Class that is a descriptor for in this virtual machine.
*/
private Class ofClass;
/*
* True if descriptor for a proxy class.
*/
boolean forProxyClass;
/*
* SerialVersionUID for this class.
*/
private long suid = kDefaultUID;
private String suidStr = null;
/*
* Actual (computed) SerialVersionUID for this class.
*/
private long actualSuid = kDefaultUID;
private String actualSuidStr = null;
/*
* The total number of bytes of primitive fields.
* The total number of object fields.
*/
int primBytes;
int objFields;
/* Internal lock object. */
private Object lock = new Object();
/* True if this class has/had a writeObject method */
private boolean hasWriteObjectMethod;
/* In JDK 1.1, external data was not written in block mode.
* As of JDK 1.2, external data is written in block data mode. This
* flag enables JDK 1.2 to be able to read JDK 1.1 written external data.
*
* @since JDK 1.2
*/
private boolean hasExternalizableBlockData;
Method writeObjectMethod;
Method readObjectMethod;
private transient Method writeReplaceObjectMethod;
private transient Method readResolveObjectMethod;
/*
* ObjectStreamClass_1_3_1 that this one was built from.
*/
private ObjectStreamClass_1_3_1 localClassDesc;
/* Get the private static final field for serial version UID */
// private static native long getSerialVersionUIDField(Class cl);
/* The Class Object for java.io.Serializable */
private static Class classSerializable = null;
private static Class classExternalizable = null;
/*
* Resolve java.io.Serializable at load time.
*/
static {
try {
classSerializable = Class.forName("java.io.Serializable");
classExternalizable = Class.forName("java.io.Externalizable");
} catch (Throwable e) {
System.err.println("Could not load java.io.Serializable or java.io.Externalizable.");
}
}
/** use serialVersionUID from JDK 1.1. for interoperability */
private static final long serialVersionUID = -6120832682080437368L;
/**
* Set serialPersistentFields of a Serializable class to this value to
* denote that the class has no Serializable fields.
*/
public static final ObjectStreamField[] NO_FIELDS =
new ObjectStreamField[0];
/*
* Entries held in the Cache of known ObjectStreamClass_1_3_1 objects.
* Entries are chained together with the same hash value (modulo array size).
*/
private static class ObjectStreamClassEntry // extends java.lang.ref.SoftReference
{
ObjectStreamClassEntry(ObjectStreamClass_1_3_1 c) {
//super(c);
this.c = c;
}
ObjectStreamClassEntry next;
public Object get()
{
return c;
}
private ObjectStreamClass_1_3_1 c;
}
/*
* Comparator object for Classes and Interfaces
*/
private static Comparator compareClassByName =
new CompareClassByName();
private static class CompareClassByName implements Comparator {
public int compare(Object o1, Object o2) {
Class c1 = (Class)o1;
Class c2 = (Class)o2;
return (c1.getName()).compareTo(c2.getName());
}
}
/*
* Comparator object for Members, Fields, and Methods
*/
private static Comparator compareMemberByName =
new CompareMemberByName();
private static class CompareMemberByName implements Comparator {
public int compare(Object o1, Object o2) {
String s1 = ((Member)o1).getName();
String s2 = ((Member)o2).getName();
if (o1 instanceof Method) {
s1 += getSignature((Method)o1);
s2 += getSignature((Method)o2);
} else if (o1 instanceof Constructor) {
s1 += getSignature((Constructor)o1);
s2 += getSignature((Constructor)o2);
}
return s1.compareTo(s2);
}
}
/* It is expensive to recompute a method or constructor signature
many times, so compute it only once using this data structure. */
private static class MethodSignature implements Comparator {
Member member;
String signature; // cached parameter signature
/* Given an array of Method or Constructor members,
return a sorted array of the non-private members.*/
/* A better implementation would be to implement the returned data
structure as an insertion sorted link list.*/
static MethodSignature[] removePrivateAndSort(Member[] m) {
int numNonPrivate = 0;
for (int i = 0; i < m.length; i++) {
if (! Modifier.isPrivate(m[i].getModifiers())) {
numNonPrivate++;
}
}
MethodSignature[] cm = new MethodSignature[numNonPrivate];
int cmi = 0;
for (int i = 0; i < m.length; i++) {
if (! Modifier.isPrivate(m[i].getModifiers())) {
cm[cmi] = new MethodSignature(m[i]);
cmi++;
}
}
if (cmi > 0)
Arrays.sort(cm, cm[0]);
return cm;
}
/* Assumes that o1 and o2 are either both methods
or both constructors.*/
public int compare(Object o1, Object o2) {
/* Arrays.sort calls compare when o1 and o2 are equal.*/
if (o1 == o2)
return 0;
MethodSignature c1 = (MethodSignature)o1;
MethodSignature c2 = (MethodSignature)o2;
int result;
if (isConstructor()) {
result = c1.signature.compareTo(c2.signature);
} else { // is a Method.
result = c1.member.getName().compareTo(c2.member.getName());
if (result == 0)
result = c1.signature.compareTo(c2.signature);
}
return result;
}
final private boolean isConstructor() {
return member instanceof Constructor;
}
private MethodSignature(Member m) {
member = m;
if (isConstructor()) {
signature = ObjectStreamClass_1_3_1.getSignature((Constructor)m);
} else {
signature = ObjectStreamClass_1_3_1.getSignature((Method)m);
}
}
}
}
Other Java examples (source code examples)Here is a short list of links related to this Java ObjectStreamClass_1_3_1.java source code file: |
The search page
Other Java source code examples at this package level
Click here to learn more about this project
