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Tools to assist in the reading of configuration/preferences files in
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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.commons.configuration2.convert;
import java.awt.Color;
import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.UnknownHostException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Duration;
import java.time.format.DateTimeParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.apache.commons.configuration2.ex.ConversionException;
import org.apache.commons.lang3.BooleanUtils;
import org.apache.commons.lang3.StringUtils;
/**
* A utility class to convert the configuration properties into any type.
*
* @since 2.8.0
*/
public final class PropertyConverter {
/** Constant for the prefix of hex numbers. */
private static final String HEX_PREFIX = "0x";
/** Constant for the radix of hex numbers. */
private static final int HEX_RADIX = 16;
/** Constant for the prefix of binary numbers. */
private static final String BIN_PREFIX = "0b";
/** Constant for the radix of binary numbers. */
private static final int BIN_RADIX = 2;
/** Constant for the argument classes of the Number constructor that takes a String. */
private static final Class[] CONSTR_ARGS = {String.class};
/** The fully qualified name of {@code javax.mail.internet.InternetAddress}, as used in the javamail-1.* API. */
private static final String INTERNET_ADDRESS_CLASSNAME_JAVAX = "javax.mail.internet.InternetAddress";
/** The fully qualified name of {@code jakarta.mail.internet.InternetAddress}, as used in the javamail-2.0+ API. */
private static final String INTERNET_ADDRESS_CLASSNAME_JAKARTA = "jakarta.mail.internet.InternetAddress";
/**
* Converts a value to a constant of an enumeration class.
*
* @param enumClass the enumeration class
* @param value the value to be converted
* @return the converted value
*/
@SuppressWarnings("unchecked")
// conversion is safe because we know that the class is an Enum class
private static Object convertToEnum(final Class enumClass, final Object value) {
return toEnum(value, enumClass.asSubclass(Enum.class));
}
/**
* Converts the specified value object to the given target data class. If additional
* information is required for this conversion, it is obtained from the passed in {@code DefaultConversionHandler}
* object. If the class is a primitive type (Integer.TYPE, Boolean.TYPE, etc), the value returned will use the wrapper
* type (Integer.class, Boolean.class, etc).
*
* @param cls the target class of the converted value
* @param value the value to convert
* @param convHandler the conversion handler object
* @return the converted value
* @throws ConversionException if the value is not compatible with the requested type
*/
public static Object to(final Class cls, final Object value, final DefaultConversionHandler convHandler) throws ConversionException {
if (cls.isInstance(value)) {
return value; // no conversion needed
}
if (String.class.equals(cls)) {
return String.valueOf(value);
}
if (Boolean.class.equals(cls) || Boolean.TYPE.equals(cls)) {
return toBoolean(value);
}
if (Character.class.equals(cls) || Character.TYPE.equals(cls)) {
return toCharacter(value);
}
if (Number.class.isAssignableFrom(cls) || cls.isPrimitive()) {
if (Integer.class.equals(cls) || Integer.TYPE.equals(cls)) {
return toInteger(value);
}
if (Long.class.equals(cls) || Long.TYPE.equals(cls)) {
return toLong(value);
}
if (Byte.class.equals(cls) || Byte.TYPE.equals(cls)) {
return toByte(value);
}
if (Short.class.equals(cls) || Short.TYPE.equals(cls)) {
return toShort(value);
}
if (Float.class.equals(cls) || Float.TYPE.equals(cls)) {
return toFloat(value);
}
if (Double.class.equals(cls) || Double.TYPE.equals(cls)) {
return toDouble(value);
}
if (BigInteger.class.equals(cls)) {
return toBigInteger(value);
}
if (BigDecimal.class.equals(cls)) {
return toBigDecimal(value);
}
} else if (Date.class.equals(cls)) {
return toDate(value, convHandler.getDateFormat());
} else if (Calendar.class.equals(cls)) {
return toCalendar(value, convHandler.getDateFormat());
} else if (File.class.equals(cls)) {
return toFile(value);
} else if (Path.class.equals(cls)) {
return toPath(value);
} else if (URI.class.equals(cls)) {
return toURI(value);
} else if (URL.class.equals(cls)) {
return toURL(value);
} else if (Pattern.class.equals(cls)) {
return toPattern(value);
} else if (Locale.class.equals(cls)) {
return toLocale(value);
} else if (cls.isEnum()) {
return convertToEnum(cls, value);
} else if (Color.class.equals(cls)) {
return toColor(value);
} else if (cls.getName().equals(INTERNET_ADDRESS_CLASSNAME_JAVAX)) {
// javamail-1.* With javax.mail.* namespace.
return toInternetAddress(value, INTERNET_ADDRESS_CLASSNAME_JAVAX);
} else if (cls.getName().equals(INTERNET_ADDRESS_CLASSNAME_JAKARTA)) {
// javamail-2.0+, with jakarta.mail.* namespace.
return toInternetAddress(value, INTERNET_ADDRESS_CLASSNAME_JAKARTA);
} else if (InetAddress.class.isAssignableFrom(cls)) {
return toInetAddress(value);
} else if (Duration.class.equals(cls)) {
return toDuration(value);
}
throw new ConversionException("The value '" + value + "' (" + value.getClass() + ")" + " can't be converted to a " + cls.getName() + " object");
}
/**
* Converts the specified object into a BigDecimal.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a BigDecimal
*/
public static BigDecimal toBigDecimal(final Object value) throws ConversionException {
final Number n = toNumber(value, BigDecimal.class);
if (n instanceof BigDecimal) {
return (BigDecimal) n;
}
return BigDecimal.valueOf(n.doubleValue());
}
/**
* Converts the specified object into a BigInteger.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a BigInteger
*/
public static BigInteger toBigInteger(final Object value) throws ConversionException {
final Number n = toNumber(value, BigInteger.class);
if (n instanceof BigInteger) {
return (BigInteger) n;
}
return BigInteger.valueOf(n.longValue());
}
/**
* Converts the specified object into a Boolean. Internally the {@code org.apache.commons.lang.BooleanUtils} class from
* the Commons Lang project is used to perform this conversion. This
* class accepts some more tokens for the boolean value of true, e.g. {@code yes} and {@code on}. Please refer to
* the documentation of this class for more details.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a boolean
*/
public static Boolean toBoolean(final Object value) throws ConversionException {
if (value instanceof Boolean) {
return (Boolean) value;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to a Boolean object");
}
final Boolean b = BooleanUtils.toBooleanObject((String) value);
if (b == null) {
throw new ConversionException("The value " + value + " can't be converted to a Boolean object");
}
return b;
}
/**
* Converts the specified object into a Byte.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a byte
*/
public static Byte toByte(final Object value) throws ConversionException {
final Number n = toNumber(value, Byte.class);
if (n instanceof Byte) {
return (Byte) n;
}
return n.byteValue();
}
/**
* Converts the specified object into a Calendar.
*
* @param value the value to convert
* @param format the DateFormat pattern to parse String values
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Calendar
*/
public static Calendar toCalendar(final Object value, final String format) throws ConversionException {
if (value instanceof Calendar) {
return (Calendar) value;
}
if (value instanceof Date) {
final Calendar calendar = Calendar.getInstance();
calendar.setTime((Date) value);
return calendar;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to a Calendar");
}
try {
final Calendar calendar = Calendar.getInstance();
calendar.setTime(new SimpleDateFormat(format).parse((String) value));
return calendar;
} catch (final ParseException e) {
throw new ConversionException("The value " + value + " can't be converted to a Calendar", e);
}
}
/**
* Converts the specified value object to a {@code Character}. This method converts the passed in object to a string. If
* the string has exactly one character, this character is returned as result. Otherwise, conversion fails.
*
* @param value the value to be converted
* @return the resulting {@code Character} object
* @throws ConversionException if the conversion is not possible
*/
public static Character toCharacter(final Object value) throws ConversionException {
final String strValue = String.valueOf(value);
if (strValue.length() == 1) {
return Character.valueOf(strValue.charAt(0));
}
throw new ConversionException(String.format("The value '%s' cannot be converted to a Character object!", strValue));
}
/**
* Converts the specified object into a Color. If the value is a String, the format allowed is
* (#)?[0-9A-F]{6}([0-9A-F]{2})?. Examples:
*
* - FF0000 (red)
* - 0000FFA0 (semi transparent blue)
* - #CCCCCC (gray)
* - #00FF00A0 (semi transparent green)
*
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Color
*/
public static Color toColor(final Object value) throws ConversionException {
if (value instanceof Color) {
return (Color) value;
}
if (!(value instanceof String) || StringUtils.isBlank((String) value)) {
throw new ConversionException("The value " + value + " can't be converted to a Color");
}
String color = ((String) value).trim();
final int[] components = new int[3];
// check the size of the string
final int minlength = components.length * 2;
if (color.length() < minlength) {
throw new ConversionException("The value " + value + " can't be converted to a Color");
}
// remove the leading #
if (color.startsWith("#")) {
color = color.substring(1);
}
try {
// parse the components
for (int i = 0; i < components.length; i++) {
components[i] = Integer.parseInt(color.substring(2 * i, 2 * i + 2), HEX_RADIX);
}
// parse the transparency
final int alpha;
if (color.length() >= minlength + 2) {
alpha = Integer.parseInt(color.substring(minlength, minlength + 2), HEX_RADIX);
} else {
alpha = Color.black.getAlpha();
}
return new Color(components[0], components[1], components[2], alpha);
} catch (final Exception e) {
throw new ConversionException("The value " + value + " can't be converted to a Color", e);
}
}
/**
* Converts the specified object into a Date.
*
* @param value the value to convert
* @param format the DateFormat pattern to parse String values
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Calendar
*/
public static Date toDate(final Object value, final String format) throws ConversionException {
if (value instanceof Date) {
return (Date) value;
}
if (value instanceof Calendar) {
return ((Calendar) value).getTime();
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to a Date");
}
try {
return new SimpleDateFormat(format).parse((String) value);
} catch (final ParseException e) {
throw new ConversionException("The value " + value + " can't be converted to a Date", e);
}
}
/**
* Converts the specified object into a Double.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Double
*/
public static Double toDouble(final Object value) throws ConversionException {
final Number n = toNumber(value, Double.class);
if (n instanceof Double) {
return (Double) n;
}
return Double.valueOf(n.doubleValue());
}
/**
* Converts the specified object into a Duration.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Duration
* @since 2.8.0
*/
public static Duration toDuration(final Object value) throws ConversionException {
if (value instanceof Duration) {
return (Duration) value;
}
if (value instanceof CharSequence) {
try {
return Duration.parse((CharSequence) value);
} catch (final DateTimeParseException e) {
throw new ConversionException("Could not convert " + value + " to Duration", e);
}
}
throw new ConversionException("The value " + value + " can't be converted to a Duration");
}
/**
* Converts the specified value into an {@link Enum}.
*
* @param value the value to convert
* @param cls the type of the enumeration
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to an enumeration
*
* @since 1.5
*/
static > E toEnum(final Object value, final Class cls) throws ConversionException {
if (value.getClass().equals(cls)) {
return cls.cast(value);
}
if (value instanceof String) {
try {
return Enum.valueOf(cls, (String) value);
} catch (final Exception e) {
throw new ConversionException("The value " + value + " can't be converted to a " + cls.getName());
}
}
if (!(value instanceof Number)) {
throw new ConversionException("The value " + value + " can't be converted to a " + cls.getName());
}
try {
final E[] enumConstants = cls.getEnumConstants();
return enumConstants[((Number) value).intValue()];
} catch (final Exception e) {
throw new ConversionException("The value " + value + " can't be converted to a " + cls.getName());
}
}
/**
* Converts the specified object into a File.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a File
* @since 2.3
*/
public static File toFile(final Object value) throws ConversionException {
if (value instanceof File) {
return (File) value;
}
if (value instanceof Path) {
return ((Path) value).toFile();
}
if (value instanceof String) {
return new File((String) value);
}
throw new ConversionException("The value " + value + " can't be converted to a File");
}
/**
* Converts the specified object into a Float.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Float
*/
public static Float toFloat(final Object value) throws ConversionException {
final Number n = toNumber(value, Float.class);
if (n instanceof Float) {
return (Float) n;
}
return Float.valueOf(n.floatValue());
}
/**
* Converts the specified value into an internet address.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a InetAddress
*
* @since 1.5
*/
static InetAddress toInetAddress(final Object value) throws ConversionException {
if (value instanceof InetAddress) {
return (InetAddress) value;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to a InetAddress");
}
try {
return InetAddress.getByName((String) value);
} catch (final UnknownHostException e) {
throw new ConversionException("The value " + value + " can't be converted to a InetAddress", e);
}
}
/**
* Converts the specified object into an Integer.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to an integer
*/
public static Integer toInteger(final Object value) throws ConversionException {
final Number n = toNumber(value, Integer.class);
if (n instanceof Integer) {
return (Integer) n;
}
return n.intValue();
}
/**
* Converts the specified value into an email address with the given class name.
*
* @param value the value to convert
* @param targetClassName the fully qualified name of the {@code InternetAddress} class to convert to, e.g.,
* {@value #INTERNET_ADDRESS_CLASSNAME_JAVAX} or {@value #INTERNET_ADDRESS_CLASSNAME_JAKARTA}
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to an email address
*
* @since 1.5
*/
static Object toInternetAddress(final Object value, final String targetClassName) throws ConversionException {
if (value.getClass().getName().equals(targetClassName)) {
return value;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to an InternetAddress");
}
try {
final Constructor ctor = Class.forName(targetClassName).getConstructor(String.class);
return ctor.newInstance(value);
} catch (final Exception e) {
throw new ConversionException("The value " + value + " can't be converted to an InternetAddress", e);
}
}
/**
* Converts the specified object into a Locale.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Locale
*/
public static Locale toLocale(final Object value) throws ConversionException {
if (value instanceof Locale) {
return (Locale) value;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to a Locale");
}
final String[] elements = ((String) value).split("_");
final int size = elements.length;
if (size >= 1 && (elements[0].length() == 2 || elements[0].isEmpty())) {
final String language = elements[0];
final String country = size >= 2 ? elements[1] : "";
final String variant = size >= 3 ? elements[2] : "";
return new Locale(language, country, variant);
}
throw new ConversionException("The value " + value + " can't be converted to a Locale");
}
/**
* Converts the specified object into a Long.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Long
*/
public static Long toLong(final Object value) throws ConversionException {
final Number n = toNumber(value, Long.class);
if (n instanceof Long) {
return (Long) n;
}
return n.longValue();
}
/**
* Tries to convert the specified object into a number object. This method is used by the conversion methods for number
* types. Note that the return value is not in always of the specified target class, but only if a new object has to be
* created.
*
* @param value the value to be converted (must not be null)
* @param targetClass the target class of the conversion (must be derived from {@link Number})
* @return the converted number
* @throws ConversionException if the object cannot be converted
*/
static Number toNumber(final Object value, final Class targetClass) throws ConversionException {
if (value instanceof Number) {
return (Number) value;
}
final String str = value.toString();
if (str.startsWith(HEX_PREFIX)) {
try {
return new BigInteger(str.substring(HEX_PREFIX.length()), HEX_RADIX);
} catch (final NumberFormatException nex) {
throw new ConversionException("Could not convert " + str + " to " + targetClass.getName() + "! Invalid hex number.", nex);
}
}
if (str.startsWith(BIN_PREFIX)) {
try {
return new BigInteger(str.substring(BIN_PREFIX.length()), BIN_RADIX);
} catch (final NumberFormatException nex) {
throw new ConversionException("Could not convert " + str + " to " + targetClass.getName() + "! Invalid binary number.", nex);
}
}
try {
final Constructor constr = targetClass.getConstructor(CONSTR_ARGS);
return (Number) constr.newInstance(str);
} catch (final InvocationTargetException itex) {
throw new ConversionException("Could not convert " + str + " to " + targetClass.getName(), itex.getTargetException());
} catch (final Exception ex) {
// Treat all possible exceptions the same way
throw new ConversionException("Conversion error when trying to convert " + str + " to " + targetClass.getName(), ex);
}
}
/**
* Converts the specified object into a Path.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Path
* @since 2.3
*/
public static Path toPath(final Object value) throws ConversionException {
if (value instanceof File) {
return ((File) value).toPath();
}
if (value instanceof Path) {
return (Path) value;
}
if (value instanceof String) {
return Paths.get((String) value);
}
throw new ConversionException("The value " + value + " can't be converted to a Path");
}
/**
* Converts the specified object into a Pattern.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a Pattern
*/
public static Pattern toPattern(final Object value) throws ConversionException {
if (value instanceof Pattern) {
return (Pattern) value;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to a Pattern");
}
try {
return Pattern.compile((String) value);
} catch (final PatternSyntaxException e) {
throw new ConversionException("The value " + value + " can't be converted to a Pattern", e);
}
}
/**
* Converts the specified object into a Short.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to a short
*/
public static Short toShort(final Object value) throws ConversionException {
final Number n = toNumber(value, Short.class);
if (n instanceof Short) {
return (Short) n;
}
return n.shortValue();
}
/**
* Converts the specified object into an URI.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to an URI
*/
public static URI toURI(final Object value) throws ConversionException {
if (value instanceof URI) {
return (URI) value;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to an URI");
}
try {
return new URI((String) value);
} catch (final URISyntaxException e) {
throw new ConversionException("The value " + value + " can't be converted to an URI", e);
}
}
/**
* Converts the specified object into an URL.
*
* @param value the value to convert
* @return the converted value
* @throws ConversionException thrown if the value cannot be converted to an URL
*/
public static URL toURL(final Object value) throws ConversionException {
if (value instanceof URL) {
return (URL) value;
}
if (!(value instanceof String)) {
throw new ConversionException("The value " + value + " can't be converted to an URL");
}
try {
return new URL((String) value);
} catch (final MalformedURLException e) {
throw new ConversionException("The value " + value + " can't be converted to an URL", e);
}
}
/**
* Private constructor prevents instances from being created.
*/
private PropertyConverter() {
// presvents instantiation.
}
}