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ObjectOutputStream: use private writeObject() methods

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The specification of the Java serialization demands that a private
writeObject(ObjectOutputStream) method is used -- if it exists. In that
case, ObjectOutputStream must not write the contents of the fields
(called 'classdata[]' in the documentation) but offer that via the
defaultWriteObject() method.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2013-10-30 12:44:59 -05:00
parent f3189bc79d
commit 931617a787
1 changed files with 40 additions and 7 deletions
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47
classpath/java/io/ObjectOutputStream.java
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@ -13,6 +13,7 @@ package java.io;
import java.util.ArrayList;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class ObjectOutputStream extends OutputStream implements DataOutput {
@ -192,7 +193,7 @@ public class ObjectOutputStream extends OutputStream implements DataOutput {
throw new RuntimeException("Unhandled primitive type: " + type);
}
private void classDesc(Class clazz) throws IOException {
private void classDesc(Class clazz, int scFlags) throws IOException {
rawByte(TC_CLASSDESC);
// class name
@ -207,7 +208,7 @@ public class ObjectOutputStream extends OutputStream implements DataOutput {
rawLong(serialVersionUID);
// handle
rawByte(SC_SERIALIZABLE);
rawByte(SC_SERIALIZABLE | scFlags);
Field[] fields = getFields(clazz);
rawShort(fields.length);
@ -292,13 +293,45 @@ public class ObjectOutputStream extends OutputStream implements DataOutput {
return;
}
rawByte(TC_OBJECT);
classDesc(o.getClass());
Method writeObject = getReadOrWriteMethod(o, "writeObject");
if (writeObject == null) {
classDesc(o.getClass(), 0);
defaultWriteObject(o);
} else try {
classDesc(o.getClass(), SC_WRITE_METHOD);
current = o;
writeObject.invoke(o, this);
current = null;
rawByte(TC_ENDBLOCKDATA);
} catch (Exception e) {
throw new IOException(e);
}
}
static Method getReadOrWriteMethod(Object o, String methodName) {
try {
Method method = o.getClass().getDeclaredMethod(methodName,
new Class[] { methodName.startsWith("write") ?
ObjectOutputStream.class : ObjectInputStream.class });
method.setAccessible(true);
int modifiers = method.getModifiers();
if ((modifiers & Modifier.STATIC) == 0 ||
(modifiers & Modifier.PRIVATE) != 0) {
return method;
}
} catch (NoSuchMethodException ignored) { }
return null;
}
private Object current;
public void defaultWriteObject() throws IOException {
defaultWriteObject(current);
}
private void defaultWriteObject(Object o) throws IOException {
for (Field field : getFields(o.getClass())) {
field(o, field);
}
}
public void defaultWriteObject() throws IOException {
throw new UnsupportedOperationException();
}
}