org.apache.logging.log4j.message.ObjectMessage 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.message;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import org.apache.logging.log4j.util.StringBuilderFormattable;
import org.apache.logging.log4j.util.StringBuilders;
/**
* Handles messages that contain an Object.
*/
public class ObjectMessage implements Message, StringBuilderFormattable {
private static final long serialVersionUID = -5903272448334166185L;
private transient Object obj;
private transient String objectString;
/**
* Creates the ObjectMessage.
*
* @param obj The Object to format.
*/
public ObjectMessage(final Object obj) {
this.obj = obj == null ? "null" : obj;
}
/**
* Returns the formatted object message.
*
* @return the formatted object message.
*/
@Override
public String getFormattedMessage() {
// LOG4J2-763: cache formatted string in case obj changes later
if (objectString == null) {
objectString = String.valueOf(obj);
}
return objectString;
}
@Override
public void formatTo(final StringBuilder buffer) {
if (objectString != null) { //
buffer.append(objectString);
} else {
StringBuilders.appendValue(buffer, obj);
}
}
/**
* Returns the object formatted using its toString method.
*
* @return the String representation of the object.
*/
@Override
public String getFormat() {
return getFormattedMessage();
}
/**
* Returns the object parameter.
*
* @return The object.
* @since 2.7
*/
public Object getParameter() {
return obj;
}
/**
* Returns the object as if it were a parameter.
*
* @return The object.
*/
@Override
public Object[] getParameters() {
return new Object[] {obj};
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final ObjectMessage that = (ObjectMessage) o;
return obj == null ? that.obj == null : equalObjectsOrStrings(obj, that.obj);
}
private boolean equalObjectsOrStrings(final Object left, final Object right) {
return left.equals(right) || String.valueOf(left).equals(String.valueOf(right));
}
@Override
public int hashCode() {
return obj != null ? obj.hashCode() : 0;
}
@Override
public String toString() {
return getFormattedMessage();
}
private void writeObject(final ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
if (obj instanceof Serializable) {
out.writeObject(obj);
} else {
out.writeObject(String.valueOf(obj));
}
}
private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
obj = in.readObject();
}
/**
* Gets the message if it is a throwable.
*
* @return the message if it is a throwable.
*/
@Override
public Throwable getThrowable() {
return obj instanceof Throwable ? (Throwable) obj : null;
}
}