org.apache.commons.beanutils.locale.BaseLocaleConverter Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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.beanutils.locale;
import java.text.ParseException;
import java.util.Locale;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* The base class for all standart type locale-sensitive converters.
* It has {@link LocaleConverter} and {@link org.apache.commons.beanutils.Converter} implementations,
* that convert an incoming locale-sensitive Object into an object of correspond type,
* optionally using a default value or throwing a {@link ConversionException}
* if a conversion error occurs.
*
* @version $Id: BaseLocaleConverter.java 1597432 2014-05-25 14:57:03Z oheger $
*/
public abstract class BaseLocaleConverter implements LocaleConverter {
// ----------------------------------------------------- Instance Variables
/** All logging goes through this logger */
private final Log log = LogFactory.getLog(BaseLocaleConverter.class);
/** The default value specified to our Constructor, if any. */
private Object defaultValue = null;
/** Should we return the default value on conversion errors? */
protected boolean useDefault = false;
/** The locale specified to our Constructor, by default - system locale. */
protected Locale locale = Locale.getDefault();
/** The default pattern specified to our Constructor, if any. */
protected String pattern = null;
/** The flag indicating whether the given pattern string is localized or not. */
protected boolean locPattern = false;
// ----------------------------------------------------------- Constructors
/**
* Create a {@link LocaleConverter} that will throw a {@link ConversionException}
* if a conversion error occurs.
* An unlocalized pattern is used for the convertion.
*
* @param locale The locale
* @param pattern The convertion pattern
*/
protected BaseLocaleConverter(Locale locale, String pattern) {
this(null, locale, pattern, false, false);
}
/**
* Create a {@link LocaleConverter} that will throw a {@link ConversionException}
* if a conversion error occurs.
*
* @param locale The locale
* @param pattern The convertion pattern
* @param locPattern Indicate whether the pattern is localized or not
*/
protected BaseLocaleConverter(Locale locale, String pattern, boolean locPattern) {
this(null, locale, pattern, false, locPattern);
}
/**
* Create a {@link LocaleConverter} that will return the specified default value
* if a conversion error occurs.
* An unlocalized pattern is used for the convertion.
*
* @param defaultValue The default value to be returned
* @param locale The locale
* @param pattern The convertion pattern
*/
protected BaseLocaleConverter(Object defaultValue, Locale locale, String pattern) {
this(defaultValue, locale, pattern, false);
}
/**
* Create a {@link LocaleConverter} that will return the specified default value
* if a conversion error occurs.
*
* @param defaultValue The default value to be returned
* @param locale The locale
* @param pattern The convertion pattern
* @param locPattern Indicate whether the pattern is localized or not
*/
protected BaseLocaleConverter(Object defaultValue, Locale locale, String pattern, boolean locPattern) {
this(defaultValue, locale, pattern, true, locPattern);
}
/**
* Create a {@link LocaleConverter} that will return the specified default value
* or throw a {@link ConversionException} if a conversion error occurs.
*
* @param defaultValue The default value to be returned
* @param locale The locale
* @param pattern The convertion pattern
* @param useDefault Indicate whether the default value is used or not
* @param locPattern Indicate whether the pattern is localized or not
*/
private BaseLocaleConverter(Object defaultValue, Locale locale,
String pattern, boolean useDefault, boolean locPattern) {
if (useDefault) {
this.defaultValue = defaultValue;
this.useDefault = true;
}
if (locale != null) {
this.locale = locale;
}
this.pattern = pattern;
this.locPattern = locPattern;
}
// --------------------------------------------------------- Methods
/**
* Convert the specified locale-sensitive input object into an output object of the
* specified type.
*
* @param value The input object to be converted
* @param pattern The pattern is used for the convertion
* @return The converted value
*
* @exception ParseException if conversion cannot be performed
* successfully
*/
abstract protected Object parse(Object value, String pattern) throws ParseException;
/**
* Convert the specified locale-sensitive input object into an output object.
* The default pattern is used for the conversion.
*
* @param value The input object to be converted
* @return The converted value
*
* @exception ConversionException if conversion cannot be performed
* successfully
*/
public Object convert(Object value) {
return convert(value, null);
}
/**
* Convert the specified locale-sensitive input object into an output object.
*
* @param value The input object to be converted
* @param pattern The pattern is used for the conversion
* @return The converted value
*
* @exception ConversionException if conversion cannot be performed
* successfully
*/
public Object convert(Object value, String pattern) {
return convert(null, value, pattern);
}
/**
* Convert the specified locale-sensitive input object into an output object of the
* specified type. The default pattern is used for the convertion.
*
* @param The desired target type of the conversion
* @param type Data type to which this value should be converted
* @param value The input object to be converted
* @return The converted value
*
* @exception ConversionException if conversion cannot be performed
* successfully
*/
public T convert(Class type, Object value) {
return convert(type, value, null);
}
/**
* Convert the specified locale-sensitive input object into an output object of the
* specified type.
*
* @param The desired target type of the conversion
* @param type Data is type to which this value should be converted
* @param value is the input object to be converted
* @param pattern is the pattern is used for the conversion; if null is
* passed then the default pattern associated with the converter object
* will be used.
* @return The converted value
*
* @exception ConversionException if conversion cannot be performed
* successfully
*/
public T convert(Class type, Object value, String pattern) {
Class targetType = ConvertUtils.primitiveToWrapper(type);
if (value == null) {
if (useDefault) {
return getDefaultAs(targetType);
} else {
// symmetric beanutils function allows null
// so do not: throw new ConversionException("No value specified");
log.debug("Null value specified for conversion, returing null");
return null;
}
}
try {
if (pattern != null) {
return checkConversionResult(targetType, parse(value, pattern));
} else {
return checkConversionResult(targetType, parse(value, this.pattern));
}
} catch (Exception e) {
if (useDefault) {
return getDefaultAs(targetType);
} else {
if (e instanceof ConversionException) {
throw (ConversionException)e;
}
throw new ConversionException(e);
}
}
}
/**
* Returns the default object specified for this converter cast for the
* given target type. If the default value is not conform to the given type,
* an exception is thrown.
*
* @param the desired target type
* @param type the target class of the conversion
* @return the default value in the given target type
* @throws ConversionException if the default object is not compatible with
* the target type
*/
private T getDefaultAs(Class type) {
return checkConversionResult(type, defaultValue);
}
/**
* Checks whether the result of a conversion is conform to the specified
* target type. If this is the case, the passed in result object is cast to
* the correct target type. Otherwise, an exception is thrown.
*
* @param the desired result type
* @param type the target class of the conversion
* @param result the conversion result object
* @return the result cast to the target class
* @throws ConversionException if the result object is not compatible with
* the target type
*/
private static T checkConversionResult(Class type, Object result) {
if (type == null) {
// in this case we cannot do much; the result object is returned
@SuppressWarnings("unchecked")
T temp = (T) result;
return temp;
}
if (result == null) {
return null;
}
if (type.isInstance(result)) {
return type.cast(result);
}
throw new ConversionException("Unsupported target type: " + type);
}
}
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