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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.marshalling;
import org.jboss.marshalling.reflect.SerializableClass;
import org.jboss.marshalling.reflect.SerializableField;
import java.io.Serializable;
/**
* A facility available to marshalling implementations which allows for detailed stack traces which trace
* the position in the object graph where a marshalling or unmarshalling problem has occurred.
*
* @apiviz.exclude
*/
public final class TraceInformation extends Throwable {
private static final long serialVersionUID = 9017837359853233891L;
Info info = null;
TraceInformation() {
}
public Throwable fillInStackTrace() {
// no operation
return this;
}
public String toString() {
final StringBuilder builder = new StringBuilder(256);
builder.append("an exception which occurred:");
final Info info = this.info;
if (info != null) info.toString(builder);
return builder.toString();
}
public void setStackTrace(final StackTraceElement[] stackTrace) {
// nothing
}
private static TraceInformation getOrAddTraceInformation(Throwable t) {
if (t == null) {
throw new NullPointerException("t is null");
}
Throwable c;
while (! (t instanceof TraceInformation)) {
c = t.getCause();
if (c == null) try {
t.initCause(c = new TraceInformation());
} catch (RuntimeException e) {
// ignored
}
t = c;
}
return (TraceInformation) t;
}
private static String getNiceClassName(Class clazz) {
if (clazz == null) {
return "unknown class";
} else if (clazz.isArray()) {
return "(array of " + getNiceClassName(clazz.getComponentType()) + ")";
} else if (clazz.isEnum() && clazz.getSuperclass() != Enum.class) {
return getNiceClassName(clazz.getSuperclass());
} else {
return clazz.getName();
}
}
/**
* Add user information about problem with marshalling or unmarshalling.
*
* @param t the throwable to update
* @param data the user data
*/
public static void addUserInformation(Throwable t, Serializable data) {
final TraceInformation ti = getOrAddTraceInformation(t);
final Info oldInfo = ti.info;
ti.info = new UserInfo(oldInfo, data);
}
/**
* Add information about a field which was being marshalled.
*
* @param t the throwable to update
* @param fieldName the field name being (un-)marshalled
*/
public static void addFieldInformation(Throwable t, String fieldName) {
final TraceInformation ti = getOrAddTraceInformation(t);
final Info oldInfo = ti.info;
ti.info = new FieldInfo(oldInfo, fieldName);
}
/**
* Add information about a field which was being marshalled.
*
* @param t the throwable to update
* @param owner
* Reference to the class that owns the field.
* @param field
* The field being (un-)marshalled.
*/
public static void addFieldInformation(Throwable t, SerializableClass owner, SerializableField field) {
addFieldInformation(t,owner.getSubjectClass().getName()+"."+field.getName());
}
/**
* Add information about an object which was being (un-)marshalled.
*
* @param t the throwable to update
* @param targetObject the target object which was being (un-)marshalled
*/
public static void addObjectInformation(Throwable t, Object targetObject) {
final TraceInformation ti = getOrAddTraceInformation(t);
final String targetClassName = getNiceClassName(targetObject.getClass());
int targetHashCode = 0;
try {
targetHashCode = targetObject.hashCode();
} catch (Throwable ignored) {
// guess we won't know the hash code!
}
final Info oldInfo = ti.info;
ti.info = new ObjectInfo(oldInfo, targetClassName, targetHashCode);
}
/**
* Add information about an incomplete object which was being unmarshalled.
*
* @param t the throwable to update
* @param targetClass the class of the target object being unmarshalled
*/
public static void addIncompleteObjectInformation(Throwable t, Class targetClass) {
addIncompleteObjectInformation(t, getNiceClassName(targetClass));
}
/**
* Add information about an incomplete object which was being unmarshalled.
*
* @param t the throwable to update
* @param targetClassName the class of the target object being unmarshalled
*/
public static void addIncompleteObjectInformation(Throwable t, String targetClassName) {
final TraceInformation ti = getOrAddTraceInformation(t);
final Info oldInfo = ti.info;
ti.info = new IncompleteObjectInfo(oldInfo, targetClassName);
}
/**
* Add information about an index into a collection which was being (un-)marshalled.
*
* @param t the throwable to update
* @param index the index of the element in question
* @param size the size of the collection in question
* @param kind the type of element being processed
*/
public static void addIndexInformation(Throwable t, int index, int size, IndexType kind) {
final TraceInformation ti = getOrAddTraceInformation(t);
final Info oldInfo = ti.info;
ti.info = new IndexInfo(oldInfo, index, size, kind);
}
/**
* Information about the circumstances surrounding (un)marshalling.
* @apiviz.exclude
*/
public abstract static class Info implements Serializable {
private static final long serialVersionUID = -5600603940887712730L;
private final Info cause;
Info(final Info cause) {
this.cause = cause;
}
public Info getCause() {
return cause;
}
protected void toString(StringBuilder builder) {
final Info cause = getCause();
if (cause != null) {
cause.toString(builder);
}
}
public final String toString() {
final StringBuilder builder = new StringBuilder(256);
toString(builder);
return builder.toString();
}
}
/**
* Information specific to a method execution.
* @apiviz.exclude
*/
public static final class MethodInfo extends Info implements Serializable {
private static final long serialVersionUID = 646518183715279704L;
/**
* The type of method being executed.
* @apiviz.exclude
*/
public enum Type {
READ_OBJECT,
READ_OBJECT_NO_DATA,
WRITE_OBJECT,
EXTERNALIZABLE_READ_OBJECT,
EXTERNALIZABLE_WRITE_OBJECT,
EXTERNALIZER_READ_OBJECT,
EXTERNALIZER_WRITE_OBJECT,
EXTERNALIZER_CREATE_OBJECT,
}
MethodInfo(final Info cause) {
super(cause);
}
}
/**
* Information about an object which was being (un-)marshalled at the time an exception occurred.
* @apiviz.exclude
*/
public static final class ObjectInfo extends Info implements Serializable {
private static final long serialVersionUID = -8580895864558204394L;
private final String targetClassName;
private final int targetHashCode;
ObjectInfo(final Info cause, final String targetClassName, final int targetHashCode) {
super(cause);
this.targetClassName = targetClassName;
this.targetHashCode = targetHashCode;
}
public String getTargetClassName() {
return targetClassName;
}
public int getTargetHashCode() {
return targetHashCode;
}
protected void toString(final StringBuilder builder) {
super.toString(builder);
builder.append("\n\tin object ").append(targetClassName).append('@').append(Integer.toHexString(targetHashCode));
}
}
/**
* Information about a class which was being (un-)marshalled at the time an exception occurred.
* @apiviz.exclude
*/
public static final class ClassInfo extends Info implements Serializable {
private static final long serialVersionUID = -8580895864558204394L;
private final String targetClassName;
ClassInfo(final Info cause, final String targetClassName) {
super(cause);
this.targetClassName = targetClassName;
}
public String getTargetClassName() {
return targetClassName;
}
protected void toString(final StringBuilder builder) {
super.toString(builder);
builder.append("\n\tin class ").append(targetClassName);
}
}
/**
* Information about an incomplete object being unmarshalled.
* @apiviz.exclude
*/
public static final class IncompleteObjectInfo extends Info implements Serializable {
private static final long serialVersionUID = -8580895864558204394L;
private final String targetClassName;
public IncompleteObjectInfo(final Info cause, final String targetClassName) {
super(cause);
this.targetClassName = targetClassName;
}
public String getTargetClassName() {
return targetClassName;
}
protected void toString(StringBuilder builder) {
super.toString(builder);
builder.append("\n\tin object of type ").append(targetClassName);
}
}
/**
* Information about a field which was being marshalled at the time an exception occurred.
* @apiviz.exclude
*/
public static final class FieldInfo extends Info implements Serializable {
private static final long serialVersionUID = -7502908990208699055L;
private final String fieldName;
FieldInfo(final Info cause, final String fieldName) {
super(cause);
this.fieldName = fieldName;
}
protected void toString(final StringBuilder builder) {
super.toString(builder);
builder.append("\n\tin field ").append(fieldName);
}
}
/**
* Information about an index in an array or collection.
* @apiviz.exclude
*/
public static final class IndexInfo extends Info implements Serializable {
private static final long serialVersionUID = -5402179533085530855L;
private final int idx;
private final int size;
private final IndexType kind;
IndexInfo(final Info cause, final int idx, final int size, final IndexType kind) {
super(cause);
this.idx = idx;
this.size = size;
this.kind = kind;
if (kind == null) {
throw new NullPointerException("kind is null");
}
}
protected void toString(final StringBuilder builder) {
super.toString(builder);
builder.append("\n\tin ");
switch (kind) {
case MAP_KEY: builder.append("map key"); break;
case MAP_VALUE: builder.append("map value"); break;
default: builder.append("element"); break;
}
builder.append(" at index [").append(idx).append(']');
if (size >= 0) {
builder.append(" of size [");
if (size == Integer.MAX_VALUE) {
builder.append("MAX_VALUE");
} else {
builder.append(size);
}
builder.append(']');
}
}
}
/**
* User information.
* @apiviz.exclude
*/
public static final class UserInfo extends Info implements Serializable {
private static final long serialVersionUID = 5504303963528386454L;
private final Serializable data;
UserInfo(final Info cause, final Serializable data) {
super(cause);
this.data = data;
}
protected void toString(final StringBuilder builder) {
super.toString(builder);
builder.append("\n\t\t-> ").append(data);
}
}
/**
* The type of index for a multi-valued collection or map.
* @apiviz.exclude
*/
public enum IndexType {
MAP_KEY,
MAP_VALUE,
ELEMENT,
}
}
