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Utility library for collections, comparators and iterator classes
/**
* The MIT License
*
* Copyright (C) 2015 Asterios Raptis
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package de.alpharogroup.collections.properties;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import de.alpharogroup.collections.list.ListFactory;
import lombok.experimental.UtilityClass;
/**
* The Class {@link PropertiesExtensions} provides methods loading properties and other related
* operations for properties like find redundant values or getting all available languages from a
* bundle.
*/
@UtilityClass
public final class PropertiesExtensions
{
/**
* The Constant SEARCH_FILE_PATTERN is a regex for searching java and html files.
*/
public static final String SEARCH_FILE_PATTERN = "([^\\s]+(\\.(?i)(java|html|htm))$)";
/**
* The Constant PROPERTIES_DELIMITERS contains all valid delimiters for properties files.
*/
public static final String[] PROPERTIES_DELIMITERS = { "=", ":", " " };
/**
* Finds redundant values from the given Properties object and saves it to a Map.
*
* @param properties
* The Properties to check.
* @return A map that contains the redundant value as the key of the map and a List(as value of
* the map) of keys that have the redundant value.
*/
public static Map> findRedundantValues(final Properties properties)
{
final Map> reverseEntries = new LinkedHashMap<>();
for (final Map.Entry entry : properties.entrySet())
{
final String key = (String)entry.getKey();
final String value = (String)entry.getValue();
if (!reverseEntries.containsKey(value))
{
final List keys = ListFactory.newArrayList();
keys.add(key);
reverseEntries.put(value, keys);
}
else
{
final List keys = reverseEntries.get(value);
keys.add(key);
}
}
final Map> redundantValues = new LinkedHashMap<>();
for (final Map.Entry> entry : reverseEntries.entrySet())
{
final String key = entry.getKey();
final List keys = entry.getValue();
if (1 < keys.size())
{
redundantValues.put(key, keys);
}
}
return redundantValues;
}
/**
* Finds all keys with the same key prefixes from the given Properties and saves them to a Map
* with the prefix as a key and holds a List with the whole keys the starts with the same key
* prefix.
*
* @param properties
* the en properties
* @return the matched prefix lists
*/
public static Map> getMatchedPrefixLists(final Properties properties)
{
final Enumeration e = properties.propertyNames();
final Map> matchedPrefixes = new LinkedHashMap<>();
while (e.hasMoreElements())
{
final String key = (String)e.nextElement();
final int lastIndex = key.lastIndexOf(".");
String subKey = null;
if (0 < lastIndex)
{
subKey = key.substring(0, lastIndex);
}
else
{
subKey = key;
}
if (matchedPrefixes.containsKey(subKey))
{
final List fullKeys = matchedPrefixes.get(subKey);
fullKeys.add(key);
}
else
{
final List fullKeys = ListFactory.newArrayList();
fullKeys.add(key);
matchedPrefixes.put(subKey, fullKeys);
}
}
return matchedPrefixes;
}
/**
* Finds the property parameters from the given propertyValue.
*
* @param propertyValue
* the property value
* @return the property parameters as a list.
*/
public static List getPropertyParameters(final String propertyValue)
{
final List parameterList = ListFactory.newArrayList();
final Pattern pattern = Pattern.compile("\\{.*?\\}");
final Matcher matcher = pattern.matcher(propertyValue);
while (matcher.find())
{
final String parameter = matcher.group();
final String at = parameter.substring(1, parameter.length() - 1);
parameterList.add(at);
}
return parameterList;
}
/**
* Load a Properties-object from the given File-object.
*
* @param propertiesFile
* the properties file
* @return the properties or null if the file is not found.
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static Properties loadProperties(final File propertiesFile) throws IOException
{
return loadProperties(propertiesFile, false);
}
/**
* Load a Properties-object from the given File-object.
*
* @param propertiesFile
* the properties file
* @param loadFromXML
* the load from XML
* @return the properties or null if the file is not found.
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static Properties loadProperties(final File propertiesFile, boolean loadFromXML)
throws IOException
{
Properties properties = null;
InputStream inputStream = null;
if (propertiesFile.exists())
{
inputStream = propertiesFile.toURI().toURL().openStream();
if (inputStream != null)
{
properties = new Properties();
if (loadFromXML)
{
properties.loadFromXML(inputStream);
}
else
{
properties.load(inputStream);
}
}
}
else
{
throw new FileNotFoundException(propertiesFile.getName() + " not found.");
}
return properties;
}
/**
* Converts the given xml file to the given properties file.
*
* @param properties
* the properties file. The xml file does not have to exist.
* @param xml
* the xml file with the properties to convert.
* @param comment
* the comment
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void toProperties(final File properties, final File xml, final String comment)
throws IOException
{
toProperties(new FileOutputStream(properties), new FileInputStream(xml), comment);
}
/**
* Converts the given xml InputStream to the given properties OutputStream.
*
* @param properties
* the properties file. The xml file does not have to exist.
* @param xml
* the xml file with the properties to convert.
* @param comment
* the comment
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void toProperties(final OutputStream properties, final InputStream xml,
final String comment) throws IOException
{
toProperties(properties, xml, comment, true);
}
/**
* Converts the given properties InputStream to the given properties {@link OutputStream} that
* represents the output file.
*
* @param outputStream
* the properties file. The xml file does not have to exist.
* @param inputStream
* the xml file with the properties to convert.
* @param comment
* the comment
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void toPropertiesFile(final OutputStream outputStream,
final InputStream inputStream, final String comment) throws IOException
{
toProperties(outputStream, inputStream, comment, false);
}
/**
* Exports the given {@link InputStream} that represents a properties file to the given
* properties {@link OutputStream} that represents the output file. The flag xmlFile tells if
* the output shell be an xml file or a properties file.
*
* @param outputStream
* the stream from the output properties file. If the file does not exists a new file
* will be created.
* @param inputStream
* the stream from input file with the properties to convert
* @param comment
* the comment
* @param xmlFile
* the flag that tells if the output shell be an xml file if true otherwise it will
* be an properties file
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void toProperties(final OutputStream outputStream, final InputStream inputStream,
final String comment, boolean xmlFile) throws IOException
{
export(null, outputStream, inputStream, comment, xmlFile, false);
}
/**
* Exports the given {@link InputStream} that represents a properties file to the given
* properties {@link OutputStream} that represents the output file.
*
* @param properties
* the properties to store
* @param outputStream
* the stream from the output properties file. If the file does not exists a new file
* will be created.
* @param inputStream
* the input stream
* @param comment
* the comment
* @param loadFromXML
* the flag that tells if the input shell be loaded from a XML file if true otherwise
* it will be loaded from a properties file
* @param storeToXML
* the flag that tells if the output shell be stored to a XML file if true otherwise
* it will be stored to a properties file
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void export(Properties properties, OutputStream outputStream,
InputStream inputStream, String comment, boolean loadFromXML, boolean storeToXML)
throws IOException
{ // create a new properties if given properties object is null
if (properties == null)
{
properties = new Properties();
}
// load from input stream if not null
if (inputStream != null)
{
if (loadFromXML)
{
properties.loadFromXML(inputStream);
}
else
{
properties.load(inputStream);
}
}
// store as xml or as normal properties format
if (storeToXML)
{
properties.storeToXML(outputStream, comment);
}
else
{
properties.store(outputStream, comment);
}
}
/**
* Exports the given {@link InputStream} that represents a properties file to the given
* properties {@link OutputStream} that represents the output file. The flag xmlFile tells if
* the output shell be an xml file or a properties file.
*
* @param properties
* the properties to store
* @param outputStream
* the stream from the output properties file. If the file does not exists a new file
* will be created.
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void export(Properties properties, OutputStream outputStream) throws IOException
{
export(properties, outputStream, null);
}
/**
* Exports the given {@link InputStream} that represents a properties file to the given
* properties {@link OutputStream} that represents the output file. The flag xmlFile tells if
* the output shell be an xml file or a properties file.
*
* @param properties
* the properties to store
* @param outputStream
* the stream from the output properties file. If the file does not exists a new file
* will be created.
* @param comment
* the comment
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void export(Properties properties, OutputStream outputStream, String comment)
throws IOException
{
export(properties, outputStream, null, comment, false, false);
}
/**
* Converts the given properties file to the given xml file.
*
* @param properties
* the properties file.
* @param xml
* the xml file to write in. The xml file does not have to exist.
* @param comment
* the comment
* @param encoding
* the encoding for the xml file.
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void toXml(final File properties, final File xml, final String comment,
final String encoding) throws IOException
{
toXml(new FileInputStream(properties), new FileOutputStream(xml), comment, encoding);
}
/**
* Converts the given properties InputStream to the given xml OutputStream.
*
* @param properties
* the properties InputStream.
* @param xml
* the xml OutputStream to write in.
* @param comment
* the comment
* @param encoding
* the encoding for the xml file.
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void toXml(final InputStream properties, final OutputStream xml,
final String comment, final String encoding) throws IOException
{
final Properties prop = new Properties();
prop.load(properties);
prop.storeToXML(xml, comment, encoding);
}
/**
* Try to get a number from the given properties key from the given properties. If it does not
* exists an empty {@link Optional} will be returned and a log message will be logged.
*
* @param properties
* the properties
* @param propertiesKey
* the properties key
* @return the port number or an empty {@linkplain Optional}
*/
public static Optional getInteger(final Properties properties,
final String propertiesKey)
{
if (properties != null && properties.containsKey(propertiesKey))
{
final String portAsString = properties.getProperty(propertiesKey);
final Integer port = Integer.valueOf(portAsString);
return Optional.of(port);
}
return Optional.empty();
}
}
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