org.apache.logging.log4j.core.jackson.Log4jStackTraceElementDeserializer Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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.apache.logging.log4j.core.jackson;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
import com.fasterxml.jackson.databind.util.ClassUtil;
import java.io.IOException;
import org.apache.logging.log4j.core.util.Integers;
/**
* Used by Jackson to deserialize a {@link StackTraceElement}. Serialization is
* performed by {@link StackTraceElementMixIn}.
*
* Consider this class private.
*
*/
public final class Log4jStackTraceElementDeserializer extends StdScalarDeserializer {
private static final long serialVersionUID = 1L;
/**
* Constructs a new initialized instance.
*/
public Log4jStackTraceElementDeserializer() {
super(StackTraceElement.class);
}
@Override
public StackTraceElement deserialize(final JsonParser jp, final DeserializationContext ctxt) throws IOException {
JsonToken t = jp.getCurrentToken();
// Must get an Object
if (t == JsonToken.START_OBJECT) {
String className = null, methodName = null, fileName = null;
int lineNumber = -1;
while ((t = jp.nextValue()) != JsonToken.END_OBJECT) {
final String propName = jp.getCurrentName();
switch (propName) {
case StackTraceElementConstants.ATTR_CLASS: {
className = jp.getText();
break;
}
case StackTraceElementConstants.ATTR_FILE: {
fileName = jp.getText();
break;
}
case StackTraceElementConstants.ATTR_LINE: {
if (t.isNumeric()) {
lineNumber = jp.getIntValue();
} else {
// An XML number always comes in a string since there is no syntax help as with JSON.
try {
lineNumber = Integers.parseInt(jp.getText());
} catch (final NumberFormatException e) {
throw JsonMappingException.from(
jp, "Non-numeric token (" + t + ") for property 'line'", e);
}
}
break;
}
case StackTraceElementConstants.ATTR_METHOD: {
methodName = jp.getText();
break;
}
case "nativeMethod": {
// no setter, not passed via constructor: ignore
}
default: {
this.handleUnknownProperty(jp, ctxt, this._valueClass, propName);
}
}
}
return new StackTraceElement(className, methodName, fileName, lineNumber);
}
throw JsonMappingException.from(
jp,
String.format(
"Cannot deserialize instance of %s out of %s token", ClassUtil.nameOf(this._valueClass), t));
}
}