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Apache Commons BeanUtils provides an easy-to-use but flexible wrapper around reflection and introspection.
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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.beanutils2.locale;
import java.beans.IndexedPropertyDescriptor;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.Locale;
import org.apache.commons.beanutils2.BeanUtilsBean;
import org.apache.commons.beanutils2.ContextClassLoaderLocal;
import org.apache.commons.beanutils2.ConvertUtils;
import org.apache.commons.beanutils2.ConvertUtilsBean;
import org.apache.commons.beanutils2.DynaBean;
import org.apache.commons.beanutils2.DynaClass;
import org.apache.commons.beanutils2.DynaProperty;
import org.apache.commons.beanutils2.MappedPropertyDescriptor;
import org.apache.commons.beanutils2.PropertyUtilsBean;
import org.apache.commons.beanutils2.expression.Resolver;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Utility methods for populating JavaBeans properties
* via reflection in a locale-dependent manner.
*
* @since 1.7
*/
public class LocaleBeanUtilsBean extends BeanUtilsBean {
/**
* Contains {@code LocaleBeanUtilsBean} instances indexed by context classloader.
*/
private static final ContextClassLoaderLocal
LOCALE_BEANS_BY_CLASSLOADER = new ContextClassLoaderLocal() {
// Creates the default instance used when the context classloader is unavailable
@Override
protected LocaleBeanUtilsBean initialValue() {
return new LocaleBeanUtilsBean();
}
};
/**
* Gets singleton instance
*
* @return the singleton instance
*/
public static LocaleBeanUtilsBean getLocaleBeanUtilsInstance() {
return LOCALE_BEANS_BY_CLASSLOADER.get();
}
/**
* Sets the instance which provides the functionality for {@link LocaleBeanUtils}.
* This is a pseudo-singleton - an single instance is provided per (thread) context classloader.
* This mechanism provides isolation for web apps deployed in the same container.
*
* @param newInstance a new singleton instance
*/
public static void setInstance(final LocaleBeanUtilsBean newInstance) {
LOCALE_BEANS_BY_CLASSLOADER.set(newInstance);
}
/** All logging goes through this logger */
private final Log log = LogFactory.getLog(LocaleBeanUtilsBean.class);
/** Convertor used by this class */
private final LocaleConvertUtilsBean localeConvertUtils;
/** Construct instance with standard conversion bean */
public LocaleBeanUtilsBean() {
this.localeConvertUtils = new LocaleConvertUtilsBean();
}
/**
* Construct instance that uses given locale conversion
*
* @param localeConvertUtils use this {@code localeConvertUtils} to perform
* conversions
* @param convertUtilsBean use this for standard conversions
* @param propertyUtilsBean use this for property conversions
*/
public LocaleBeanUtilsBean(
final LocaleConvertUtilsBean localeConvertUtils,
final ConvertUtilsBean convertUtilsBean,
final PropertyUtilsBean propertyUtilsBean) {
super(convertUtilsBean, propertyUtilsBean);
this.localeConvertUtils = localeConvertUtils;
}
/**
* Construct instance that uses given locale conversion
*
* @param localeConvertUtils use this {@code localeConvertUtils} to perform
* conversions
*/
public LocaleBeanUtilsBean(final LocaleConvertUtilsBean localeConvertUtils) {
this.localeConvertUtils = localeConvertUtils;
}
/**
* Gets the bean instance used for conversions
*
* @return the locale converter bean instance
*/
public LocaleConvertUtilsBean getLocaleConvertUtils() {
return localeConvertUtils;
}
/**
* Gets the default Locale
* @return the default locale
*/
public Locale getDefaultLocale() {
return getLocaleConvertUtils().getDefaultLocale();
}
/**
* Sets the default Locale.
*
* @param locale the default locale
*/
public void setDefaultLocale(final Locale locale) {
getLocaleConvertUtils().setDefaultLocale(locale);
}
/**
* Is the pattern to be applied localized
* (Indicate whether the pattern is localized or not)
*
* @return {@code true} if pattern is localized,
* otherwise {@code false}
*/
public boolean getApplyLocalized() {
return getLocaleConvertUtils().getApplyLocalized();
}
/**
* Sets whether the pattern is applied localized
* (Indicate whether the pattern is localized or not)
*
* @param newApplyLocalized {@code true} if pattern is localized,
* otherwise {@code false}
*/
public void setApplyLocalized(final boolean newApplyLocalized) {
getLocaleConvertUtils().setApplyLocalized(newApplyLocalized);
}
/**
* Gets the value of the specified locale-sensitive indexed property
* of the specified bean, as a String. The zero-relative index of the
* required value must be included (in square brackets) as a suffix to
* the property name, or {@code IllegalArgumentException} will be
* thrown.
*
* @param bean Bean whose property is to be extracted
* @param name {@code propertyname[index]} of the property value
* to be extracted
* @param pattern The conversion pattern
* @return The indexed property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
public String getIndexedProperty(
final Object bean,
final String name,
final String pattern)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
final Object value = getPropertyUtils().getIndexedProperty(bean, name);
return getLocaleConvertUtils().convert(value, pattern);
}
/**
* Gets the value of the specified locale-sensitive indexed property
* of the specified bean, as a String using the default conversion pattern of
* the corresponding {@link LocaleConverter}. The zero-relative index
* of the required value must be included (in square brackets) as a suffix
* to the property name, or {@code IllegalArgumentException} will be thrown.
*
* @param bean Bean whose property is to be extracted
* @param name {@code propertyname[index]} of the property value
* to be extracted
* @return The indexed property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
@Override
public String getIndexedProperty(
final Object bean,
final String name)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
return getIndexedProperty(bean, name, null);
}
/**
* Gets the value of the specified locale-sensetive indexed property
* of the specified bean, as a String using the specified conversion pattern.
* The index is specified as a method parameter and
* must *not* be included in the property name expression
*
* @param bean Bean whose property is to be extracted
* @param name Simple property name of the property value to be extracted
* @param index Index of the property value to be extracted
* @param pattern The conversion pattern
* @return The indexed property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
public String getIndexedProperty(final Object bean,
final String name, final int index, final String pattern)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
final Object value = getPropertyUtils().getIndexedProperty(bean, name, index);
return getLocaleConvertUtils().convert(value, pattern);
}
/**
* Gets the value of the specified locale-sensetive indexed property
* of the specified bean, as a String using the default conversion pattern of
* the corresponding {@link LocaleConverter}.
* The index is specified as a method parameter and
* must *not* be included in the property name expression
*
* @param bean Bean whose property is to be extracted
* @param name Simple property name of the property value to be extracted
* @param index Index of the property value to be extracted
* @return The indexed property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
@Override
public String getIndexedProperty(final Object bean,
final String name, final int index)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
return getIndexedProperty(bean, name, index, null);
}
/**
* Gets the value of the specified simple locale-sensitive property
* of the specified bean, converted to a String using the specified
* conversion pattern.
*
* @param bean Bean whose property is to be extracted
* @param name Name of the property to be extracted
* @param pattern The conversion pattern
* @return The property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
public String getSimpleProperty(final Object bean, final String name, final String pattern)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
final Object value = getPropertyUtils().getSimpleProperty(bean, name);
return getLocaleConvertUtils().convert(value, pattern);
}
/**
* Gets the value of the specified simple locale-sensitive property
* of the specified bean, converted to a String using the default
* conversion pattern of the corresponding {@link LocaleConverter}.
*
* @param bean Bean whose property is to be extracted
* @param name Name of the property to be extracted
* @return The property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
@Override
public String getSimpleProperty(final Object bean, final String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
return getSimpleProperty(bean, name, null);
}
/**
* Gets the value of the specified mapped locale-sensitive property
* of the specified bean, as a String using the specified conversion pattern.
* The key is specified as a method parameter and must *not* be included in
* the property name expression.
*
* @param bean Bean whose property is to be extracted
* @param name Simple property name of the property value to be extracted
* @param key Lookup key of the property value to be extracted
* @param pattern The conversion pattern
* @return The mapped property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
public String getMappedProperty(
final Object bean,
final String name,
final String key,
final String pattern)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
final Object value = getPropertyUtils().getMappedProperty(bean, name, key);
return getLocaleConvertUtils().convert(value, pattern);
}
/**
* Gets the value of the specified mapped locale-sensitive property
* of the specified bean, as a String
* The key is specified as a method parameter and must *not* be included
* in the property name expression
*
* @param bean Bean whose property is to be extracted
* @param name Simple property name of the property value to be extracted
* @param key Lookup key of the property value to be extracted
* @return The mapped property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
@Override
public String getMappedProperty(final Object bean,
final String name, final String key)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
return getMappedProperty(bean, name, key, null);
}
/**
* Gets the value of the specified locale-sensitive mapped property
* of the specified bean, as a String using the specified pattern.
* The String-valued key of the required value
* must be included (in parentheses) as a suffix to
* the property name, or {@code IllegalArgumentException} will be
* thrown.
*
* @param bean Bean whose property is to be extracted
* @param name {@code propertyname(index)} of the property value
* to be extracted
* @param pattern The conversion pattern
* @return The mapped property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
public String getMappedPropertyLocale(
final Object bean,
final String name,
final String pattern)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
final Object value = getPropertyUtils().getMappedProperty(bean, name);
return getLocaleConvertUtils().convert(value, pattern);
}
/**
* Gets the value of the specified locale-sensitive mapped property
* of the specified bean, as a String using the default
* conversion pattern of the corresponding {@link LocaleConverter}.
* The String-valued key of the required value
* must be included (in parentheses) as a suffix to
* the property name, or {@code IllegalArgumentException} will be
* thrown.
*
* @param bean Bean whose property is to be extracted
* @param name {@code propertyname(index)} of the property value
* to be extracted
* @return The mapped property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
@Override
public String getMappedProperty(final Object bean, final String name)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
return getMappedPropertyLocale(bean, name, null);
}
/**
* Gets the value of the (possibly nested) locale-sensitive property
* of the specified name, for the specified bean,
* as a String using the specified pattern.
*
* @param bean Bean whose property is to be extracted
* @param name Possibly nested name of the property to be extracted
* @param pattern The conversion pattern
* @return The nested property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws IllegalArgumentException if a nested reference to a
* property returns null
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
public String getNestedProperty(
final Object bean,
final String name,
final String pattern)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
final Object value = getPropertyUtils().getNestedProperty(bean, name);
return getLocaleConvertUtils().convert(value, pattern);
}
/**
* Gets the value of the (possibly nested) locale-sensitive property
* of the specified name, for the specified bean, as a String using the default
* conversion pattern of the corresponding {@link LocaleConverter}.
*
* @param bean Bean whose property is to be extracted
* @param name Possibly nested name of the property to be extracted
* @return The nested property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws IllegalArgumentException if a nested reference to a
* property returns null
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
@Override
public String getNestedProperty(final Object bean, final String name)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
return getNestedProperty(bean, name, null);
}
/**
* Gets the value of the specified locale-sensitive property
* of the specified bean, no matter which property reference
* format is used, as a String using the specified conversion pattern.
*
* @param bean Bean whose property is to be extracted
* @param name Possibly indexed and/or nested name of the property
* to be extracted
* @param pattern The conversion pattern
* @return The nested property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
public String getProperty(final Object bean, final String name, final String pattern)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
return getNestedProperty(bean, name, pattern);
}
/**
* Gets the value of the specified locale-sensitive property
* of the specified bean, no matter which property reference
* format is used, as a String using the default
* conversion pattern of the corresponding {@link LocaleConverter}.
*
* @param bean Bean whose property is to be extracted
* @param name Possibly indexed and/or nested name of the property
* to be extracted
* @return The property's value, converted to a String
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
* @throws NoSuchMethodException if an accessor method for this
* property cannot be found
*/
@Override
public String getProperty(final Object bean, final String name)
throws
IllegalAccessException,
InvocationTargetException,
NoSuchMethodException {
return getNestedProperty(bean, name);
}
/**
* Sets the specified locale-sensitive property value, performing type
* conversions as required to conform to the type of the destination property
* using the default conversion pattern of the corresponding {@link LocaleConverter}.
*
* @param bean Bean on which setting is to be performed
* @param name Property name (can be nested/indexed/mapped/combo)
* @param value Value to be set
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
*/
@Override
public void setProperty(final Object bean, final String name, final Object value)
throws
IllegalAccessException,
InvocationTargetException {
setProperty(bean, name, value, null);
}
/**
* Sets the specified locale-sensitive property value, performing type
* conversions as required to conform to the type of the destination
* property using the specified conversion pattern.
*
* @param bean Bean on which setting is to be performed
* @param name Property name (can be nested/indexed/mapped/combo)
* @param value Value to be set
* @param pattern The conversion pattern
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
*/
public void setProperty(
final Object bean,
String name,
final Object value,
final String pattern)
throws
IllegalAccessException,
InvocationTargetException {
// Trace logging (if enabled)
if (log.isTraceEnabled()) {
final StringBuilder sb = new StringBuilder(" setProperty(");
sb.append(bean);
sb.append(", ");
sb.append(name);
sb.append(", ");
if (value == null) {
sb.append("");
}
else if (value instanceof String) {
sb.append((String) value);
}
else if (value instanceof String[]) {
final String[] values = (String[]) value;
sb.append('[');
for (int i = 0; i < values.length; i++) {
if (i > 0) {
sb.append(',');
}
sb.append(values[i]);
}
sb.append(']');
}
else {
sb.append(value.toString());
}
sb.append(')');
log.trace(sb.toString());
}
// Resolve any nested expression to get the actual target bean
Object target = bean;
final Resolver resolver = getPropertyUtils().getResolver();
while (resolver.hasNested(name)) {
try {
target = getPropertyUtils().getProperty(target, resolver.next(name));
name = resolver.remove(name);
} catch (final NoSuchMethodException e) {
return; // Skip this property setter
}
}
if (log.isTraceEnabled()) {
log.trace(" Target bean = " + target);
log.trace(" Target name = " + name);
}
// Declare local variables we will require
final String propName = resolver.getProperty(name); // Simple name of target property
final int index = resolver.getIndex(name); // Indexed subscript value (if any)
final String key = resolver.getKey(name); // Mapped key value (if any)
final Class type = definePropertyType(target, name, propName);
if (type != null) {
final Object newValue = convert(type, index, value, pattern);
invokeSetter(target, propName, key, index, newValue);
}
}
/**
* Calculate the property type.
*
* @param target The bean
* @param name The property name
* @param propName The Simple name of target property
* @return The property's type
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
*/
protected Class definePropertyType(final Object target, final String name, final String propName)
throws IllegalAccessException, InvocationTargetException {
Class type = null; // Java type of target property
if (target instanceof DynaBean) {
final DynaClass dynaClass = ((DynaBean) target).getDynaClass();
final DynaProperty dynaProperty = dynaClass.getDynaProperty(propName);
if (dynaProperty == null) {
return null; // Skip this property setter
}
type = dynaProperty.getType();
}
else {
PropertyDescriptor descriptor = null;
try {
descriptor =
getPropertyUtils().getPropertyDescriptor(target, name);
if (descriptor == null) {
return null; // Skip this property setter
}
}
catch (final NoSuchMethodException e) {
return null; // Skip this property setter
}
if (descriptor instanceof MappedPropertyDescriptor) {
type = ((MappedPropertyDescriptor) descriptor).
getMappedPropertyType();
}
else if (descriptor instanceof IndexedPropertyDescriptor) {
type = ((IndexedPropertyDescriptor) descriptor).
getIndexedPropertyType();
}
else {
type = descriptor.getPropertyType();
}
}
return type;
}
/**
* Convert the specified value to the required type using the
* specified conversion pattern.
*
* @param type The Java type of target property
* @param index The indexed subscript value (if any)
* @param value The value to be converted
* @param pattern The conversion pattern
* @return The converted value
*/
protected Object convert(final Class type, final int index, final Object value, final String pattern) {
if (log.isTraceEnabled()) {
log.trace("Converting value '" + value + "' to type:" + type);
}
Object newValue = null;
if (type.isArray() && index < 0) { // Scalar value into array
if (value instanceof String) {
final String[] values = new String[1];
values[0] = (String) value;
newValue = getLocaleConvertUtils().convert(values, type, pattern);
}
else if (value instanceof String[]) {
newValue = getLocaleConvertUtils().convert((String[]) value, type, pattern);
}
else {
newValue = value;
}
}
else if (type.isArray()) { // Indexed value into array
if (value instanceof String) {
newValue = getLocaleConvertUtils().convert((String) value,
type.getComponentType(), pattern);
}
else if (value instanceof String[]) {
newValue = getLocaleConvertUtils().convert(((String[]) value)[0],
type.getComponentType(), pattern);
}
else {
newValue = value;
}
}
else { // Value into scalar
if (value instanceof String) {
newValue = getLocaleConvertUtils().convert((String) value, type, pattern);
}
else if (value instanceof String[]) {
newValue = getLocaleConvertUtils().convert(((String[]) value)[0],
type, pattern);
}
else {
newValue = value;
}
}
return newValue;
}
/**
* Convert the specified value to the required type.
*
* @param type The Java type of target property
* @param index The indexed subscript value (if any)
* @param value The value to be converted
* @return The converted value
*/
protected Object convert(final Class type, final int index, final Object value) {
Object newValue = null;
if (type.isArray() && index < 0) { // Scalar value into array
if (value instanceof String) {
final String[] values = new String[1];
values[0] = (String) value;
newValue = ConvertUtils.convert(values, type);
}
else if (value instanceof String[]) {
newValue = ConvertUtils.convert((String[]) value, type);
}
else {
newValue = value;
}
}
else if (type.isArray()) { // Indexed value into array
if (value instanceof String) {
newValue = ConvertUtils.convert((String) value,
type.getComponentType());
}
else if (value instanceof String[]) {
newValue = ConvertUtils.convert(((String[]) value)[0],
type.getComponentType());
}
else {
newValue = value;
}
}
else { // Value into scalar
if (value instanceof String) {
newValue = ConvertUtils.convert((String) value, type);
}
else if (value instanceof String[]) {
newValue = ConvertUtils.convert(((String[]) value)[0],
type);
}
else {
newValue = value;
}
}
return newValue;
}
/**
* Invoke the setter method.
*
* @param target The bean
* @param propName The Simple name of target property
* @param key The Mapped key value (if any)
* @param index The indexed subscript value (if any)
* @param newValue The value to be set
*
* @throws IllegalAccessException if the caller does not have
* access to the property accessor method
* @throws InvocationTargetException if the property accessor method
* throws an exception
*/
protected void invokeSetter(final Object target, final String propName, final String key, final int index,
final Object newValue)
throws IllegalAccessException, InvocationTargetException {
try {
if (index >= 0) {
getPropertyUtils().setIndexedProperty(target, propName,
index, newValue);
}
else if (key != null) {
getPropertyUtils().setMappedProperty(target, propName,
key, newValue);
}
else {
getPropertyUtils().setProperty(target, propName, newValue);
}
}
catch (final NoSuchMethodException e) {
throw new InvocationTargetException
(e, "Cannot set " + propName);
}
}
}