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Statistical sampling library for use in virtdata libraries, based on apache commons math 4

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/*
 * 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.util.Arrays;

/**
 * Handles messages that contain an Object[].
 * 

* Created for use with the CSV layout. For example: *

*

* {@code logger.debug(new ObjectArrayMessage(1, 2, "Bob"));} *

* * @since 2.4 */ public final class ObjectArrayMessage implements Message { private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0]; private static final long serialVersionUID = -5903272448334166185L; private transient Object[] array; private transient String arrayString; /** * Creates the ObjectMessage. * * @param obj * The Object to format. */ public ObjectArrayMessage(final Object... obj) { this.array = obj == null ? EMPTY_OBJECT_ARRAY : obj; } private boolean equalObjectsOrStrings(final Object[] left, final Object[] right) { return Arrays.equals(left, right) || Arrays.toString(left).equals(Arrays.toString(right)); } @Override public boolean equals(final Object o) { if (this == o) { return true; } if (o == null || getClass() != o.getClass()) { return false; } final ObjectArrayMessage that = (ObjectArrayMessage) o; return array == null ? that.array == null : equalObjectsOrStrings(array, that.array); } /** * Returns the object formatted using its toString method. * * @return the String representation of the object. */ @Override public String getFormat() { return getFormattedMessage(); } /** * 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 (arrayString == null) { arrayString = Arrays.toString(array); } return arrayString; } /** * Returns the object as if it were a parameter. * * @return The object. */ @Override public Object[] getParameters() { return array; } /** * Returns null. * * @return null. */ @Override public Throwable getThrowable() { return null; } @Override public int hashCode() { return Arrays.hashCode(array); } private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); array = (Object[]) in.readObject(); } @Override public String toString() { return getFormattedMessage(); } private void writeObject(final ObjectOutputStream out) throws IOException { out.defaultWriteObject(); out.writeObject(array); } }




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