org.springframework.core.SortedProperties Maven / Gradle / Ivy
/*
* Copyright 2002-2020 the original author or authors.
*
* 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
*
* https://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.springframework.core;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.Comparator;
import java.util.Enumeration;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.TreeSet;
import org.springframework.lang.Nullable;
/**
* Specialization of {@link Properties} that sorts properties alphanumerically
* based on their keys.
*
* This can be useful when storing the {@link Properties} instance in a
* properties file, since it allows such files to be generated in a repeatable
* manner with consistent ordering of properties.
*
*
Comments in generated properties files can also be optionally omitted.
*
* @author Sam Brannen
* @since 5.2
* @see java.util.Properties
*/
@SuppressWarnings("serial")
class SortedProperties extends Properties {
static final String EOL = System.lineSeparator();
private static final Comparator