Commons Beanutils example source code file (ConvertUtilsBean.java)
The Commons Beanutils ConvertUtilsBean.java source code/*
* 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;
import java.io.File;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URL;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Collection;
import org.apache.commons.beanutils.converters.ArrayConverter;
import org.apache.commons.beanutils.converters.BigDecimalConverter;
import org.apache.commons.beanutils.converters.BigIntegerConverter;
import org.apache.commons.beanutils.converters.BooleanConverter;
import org.apache.commons.beanutils.converters.ByteConverter;
import org.apache.commons.beanutils.converters.CalendarConverter;
import org.apache.commons.beanutils.converters.CharacterConverter;
import org.apache.commons.beanutils.converters.ClassConverter;
import org.apache.commons.beanutils.converters.ConverterFacade;
import org.apache.commons.beanutils.converters.DateConverter;
import org.apache.commons.beanutils.converters.DoubleConverter;
import org.apache.commons.beanutils.converters.FileConverter;
import org.apache.commons.beanutils.converters.FloatConverter;
import org.apache.commons.beanutils.converters.IntegerConverter;
import org.apache.commons.beanutils.converters.LongConverter;
import org.apache.commons.beanutils.converters.ShortConverter;
import org.apache.commons.beanutils.converters.SqlDateConverter;
import org.apache.commons.beanutils.converters.SqlTimeConverter;
import org.apache.commons.beanutils.converters.SqlTimestampConverter;
import org.apache.commons.beanutils.converters.StringConverter;
import org.apache.commons.beanutils.converters.URLConverter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* <p>Utility methods for converting String scalar values to objects of the
* specified Class, String arrays to arrays of the specified Class. The
* actual {@link Converter} instance to be used can be registered for each
* possible destination Class. Unless you override them, standard
* {@link Converter} instances are provided for all of the following
* destination Classes:</p>
* <ul>
* <li>java.lang.BigDecimal (no default value)
* <li>java.lang.BigInteger (no default value)
* <li>boolean and java.lang.Boolean (default to false)
* <li>byte and java.lang.Byte (default to zero)
* <li>char and java.lang.Character (default to a space)
* <li>java.lang.Class (no default value)
* <li>double and java.lang.Double (default to zero)
* <li>float and java.lang.Float (default to zero)
* <li>int and java.lang.Integer (default to zero)
* <li>long and java.lang.Long (default to zero)
* <li>short and java.lang.Short (default to zero)
* <li>java.lang.String (default to null)
* <li>java.io.File (no default value)
* <li>java.net.URL (no default value)
* <li>java.sql.Date (no default value)
* <li>java.sql.Time (no default value)
* <li>java.sql.Timestamp (no default value)
* </ul>
*
* <p>For backwards compatibility, the standard Converters for primitive
* types (and the corresponding wrapper classes) return a defined
* default value when a conversion error occurs. If you prefer to have a
* {@link ConversionException} thrown instead, replace the standard Converter
* instances with instances created with the zero-arguments constructor. For
* example, to cause the Converters for integers to throw an exception on
* conversion errors, you could do this:</p>
* <pre>
* // No-args constructor gets the version that throws exceptions
* Converter myConverter =
* new org.apache.commons.beanutils.converter.IntegerConverter();
* ConvertUtils.register(myConverter, Integer.TYPE); // Native type
* ConvertUtils.register(myConverter, Integer.class); // Wrapper class
* </pre>
*
* <p>
* Converters generally treat null input as if it were invalid
* input, ie they return their default value if one was specified when the
* converter was constructed, and throw an exception otherwise. If you prefer
* nulls to be preserved for converters that are converting to objects (not
* primitives) then register a converter as above, passing a default value of
* null to the converter constructor (and of course registering that converter
* only for the .class target).
* </p>
*
* <p>
* When a converter is listed above as having no default value, then that
* converter will throw an exception when passed null or an invalid value
* as its input. In particular, by default the BigInteger and BigDecimal
* converters have no default (and are therefore somewhat inconsistent
* with the other numerical converters which all have zero as their default).
* </p>
*
* <p>
* Converters that generate <i>arrays of each of the primitive types are
* also automatically configured (including String[]). When passed null
* or invalid input, these return an empty array (not null). See class
* AbstractArrayConverter for the supported input formats for these converters.
* </p>
*
* @author Craig R. McClanahan
* @author Ralph Schaer
* @author Chris Audley
* @author James Strachan
* @version $Revision: 745079 $ $Date: 2009-02-17 14:04:10 +0000 (Tue, 17 Feb 2009) $
* @since 1.7
*/
public class ConvertUtilsBean {
private static final Integer ZERO = new Integer(0);
private static final Character SPACE = new Character(' ');
// ------------------------------------------------------- Class Methods
/**
* Get singleton instance
* @return The singleton instance
*/
protected static ConvertUtilsBean getInstance() {
return BeanUtilsBean.getInstance().getConvertUtils();
}
// ------------------------------------------------------- Variables
/**
* The set of {@link Converter}s that can be used to convert Strings
* into objects of a specified Class, keyed by the destination Class.
*/
private WeakFastHashMap converters = new WeakFastHashMap();
/**
* The <code>Log instance for this class.
*/
private Log log = LogFactory.getLog(ConvertUtils.class);
// ------------------------------------------------------- Constructors
/** Construct a bean with standard converters registered */
public ConvertUtilsBean() {
converters.setFast(false);
deregister();
converters.setFast(true);
}
// --------------------------------------------------------- Public Methods
/**
* The default value for Boolean conversions.
* @deprecated Register replacement converters for Boolean.TYPE and
* Boolean.class instead
*/
private Boolean defaultBoolean = Boolean.FALSE;
/**
* Gets the default value for Boolean conversions.
* @return The default Boolean value
* @deprecated Register replacement converters for Boolean.TYPE and
* Boolean.class instead
*/
public boolean getDefaultBoolean() {
return (defaultBoolean.booleanValue());
}
/**
* Sets the default value for Boolean conversions.
* @param newDefaultBoolean The default Boolean value
* @deprecated Register replacement converters for Boolean.TYPE and
* Boolean.class instead
*/
public void setDefaultBoolean(boolean newDefaultBoolean) {
defaultBoolean = (newDefaultBoolean ? Boolean.TRUE : Boolean.FALSE);
register(new BooleanConverter(defaultBoolean), Boolean.TYPE);
register(new BooleanConverter(defaultBoolean), Boolean.class);
}
/**
* The default value for Byte conversions.
* @deprecated Register replacement converters for Byte.TYPE and
* Byte.class instead
*/
private Byte defaultByte = new Byte((byte) 0);
/**
* Gets the default value for Byte conversions.
* @return The default Byte value
* @deprecated Register replacement converters for Byte.TYPE and
* Byte.class instead
*/
public byte getDefaultByte() {
return (defaultByte.byteValue());
}
/**
* Sets the default value for Byte conversions.
* @param newDefaultByte The default Byte value
* @deprecated Register replacement converters for Byte.TYPE and
* Byte.class instead
*/
public void setDefaultByte(byte newDefaultByte) {
defaultByte = new Byte(newDefaultByte);
register(new ByteConverter(defaultByte), Byte.TYPE);
register(new ByteConverter(defaultByte), Byte.class);
}
/**
* The default value for Character conversions.
* @deprecated Register replacement converters for Character.TYPE and
* Character.class instead
*/
private Character defaultCharacter = new Character(' ');
/**
* Gets the default value for Character conversions.
* @return The default Character value
* @deprecated Register replacement converters for Character.TYPE and
* Character.class instead
*/
public char getDefaultCharacter() {
return (defaultCharacter.charValue());
}
/**
* Sets the default value for Character conversions.
* @param newDefaultCharacter The default Character value
* @deprecated Register replacement converters for Character.TYPE and
* Character.class instead
*/
public void setDefaultCharacter(char newDefaultCharacter) {
defaultCharacter = new Character(newDefaultCharacter);
register(new CharacterConverter(defaultCharacter),
Character.TYPE);
register(new CharacterConverter(defaultCharacter),
Character.class);
}
/**
* The default value for Double conversions.
* @deprecated Register replacement converters for Double.TYPE and
* Double.class instead
*/
private Double defaultDouble = new Double(0.0);
/**
* Gets the default value for Double conversions.
* @return The default Double value
* @deprecated Register replacement converters for Double.TYPE and
* Double.class instead
*/
public double getDefaultDouble() {
return (defaultDouble.doubleValue());
}
/**
* Sets the default value for Double conversions.
* @param newDefaultDouble The default Double value
* @deprecated Register replacement converters for Double.TYPE and
* Double.class instead
*/
public void setDefaultDouble(double newDefaultDouble) {
defaultDouble = new Double(newDefaultDouble);
register(new DoubleConverter(defaultDouble), Double.TYPE);
register(new DoubleConverter(defaultDouble), Double.class);
}
/**
* The default value for Float conversions.
* @deprecated Register replacement converters for Float.TYPE and
* Float.class instead
*/
private Float defaultFloat = new Float((float) 0.0);
/**
* Gets the default value for Float conversions.
* @return The default Float value
* @deprecated Register replacement converters for Float.TYPE and
* Float.class instead
*/
public float getDefaultFloat() {
return (defaultFloat.floatValue());
}
/**
* Sets the default value for Float conversions.
* @param newDefaultFloat The default Float value
* @deprecated Register replacement converters for Float.TYPE and
* Float.class instead
*/
public void setDefaultFloat(float newDefaultFloat) {
defaultFloat = new Float(newDefaultFloat);
register(new FloatConverter(defaultFloat), Float.TYPE);
register(new FloatConverter(defaultFloat), Float.class);
}
/**
* The default value for Integer conversions.
* @deprecated Register replacement converters for Integer.TYPE and
* Integer.class instead
*/
private Integer defaultInteger = new Integer(0);
/**
* Gets the default value for Integer conversions.
* @return The default Integer value
* @deprecated Register replacement converters for Integer.TYPE and
* Integer.class instead
*/
public int getDefaultInteger() {
return (defaultInteger.intValue());
}
/**
* Sets the default value for Integer conversions.
* @param newDefaultInteger The default Integer value
* @deprecated Register replacement converters for Integer.TYPE and
* Integer.class instead
*/
public void setDefaultInteger(int newDefaultInteger) {
defaultInteger = new Integer(newDefaultInteger);
register(new IntegerConverter(defaultInteger), Integer.TYPE);
register(new IntegerConverter(defaultInteger), Integer.class);
}
/**
* The default value for Long conversions.
* @deprecated Register replacement converters for Long.TYPE and
* Long.class instead
*/
private Long defaultLong = new Long(0);
/**
* Gets the default value for Long conversions.
* @return The default Long value
* @deprecated Register replacement converters for Long.TYPE and
* Long.class instead
*/
public long getDefaultLong() {
return (defaultLong.longValue());
}
/**
* Sets the default value for Long conversions.
* @param newDefaultLong The default Long value
* @deprecated Register replacement converters for Long.TYPE and
* Long.class instead
*/
public void setDefaultLong(long newDefaultLong) {
defaultLong = new Long(newDefaultLong);
register(new LongConverter(defaultLong), Long.TYPE);
register(new LongConverter(defaultLong), Long.class);
}
/**
* The default value for Short conversions.
* @deprecated Register replacement converters for Short.TYPE and
* Short.class instead
*/
private static Short defaultShort = new Short((short) 0);
/**
* Gets the default value for Short conversions.
* @return The default Short value
* @deprecated Register replacement converters for Short.TYPE and
* Short.class instead
*/
public short getDefaultShort() {
return (defaultShort.shortValue());
}
/**
* Sets the default value for Short conversions.
* @param newDefaultShort The default Short value
* @deprecated Register replacement converters for Short.TYPE and
* Short.class instead
*/
public void setDefaultShort(short newDefaultShort) {
defaultShort = new Short(newDefaultShort);
register(new ShortConverter(defaultShort), Short.TYPE);
register(new ShortConverter(defaultShort), Short.class);
}
/**
* Convert the specified value into a String. If the specified value
* is an array, the first element (converted to a String) will be
* returned. The registered {@link Converter} for the
* <code>java.lang.String class will be used, which allows
* applications to customize Object->String conversions (the default
* implementation simply uses toString()).
*
* @param value Value to be converted (may be null)
* @return The converted String value
*/
public String convert(Object value) {
if (value == null) {
return null;
} else if (value.getClass().isArray()) {
if (Array.getLength(value) < 1) {
return (null);
}
value = Array.get(value, 0);
if (value == null) {
return null;
} else {
Converter converter = lookup(String.class);
return ((String) converter.convert(String.class, value));
}
} else {
Converter converter = lookup(String.class);
return ((String) converter.convert(String.class, value));
}
}
/**
* Convert the specified value to an object of the specified class (if
* possible). Otherwise, return a String representation of the value.
*
* @param value Value to be converted (may be null)
* @param clazz Java class to be converted to
* @return The converted value
*
* @exception ConversionException if thrown by an underlying Converter
*/
public Object convert(String value, Class clazz) {
if (log.isDebugEnabled()) {
log.debug("Convert string '" + value + "' to class '" +
clazz.getName() + "'");
}
Converter converter = lookup(clazz);
if (converter == null) {
converter = lookup(String.class);
}
if (log.isTraceEnabled()) {
log.trace(" Using converter " + converter);
}
return (converter.convert(clazz, value));
}
/**
* Convert an array of specified values to an array of objects of the
* specified class (if possible). If the specified Java class is itself
* an array class, this class will be the type of the returned value.
* Otherwise, an array will be constructed whose component type is the
* specified class.
*
* @param values Array of values to be converted
* @param clazz Java array or element class to be converted to
* @return The converted value
*
* @exception ConversionException if thrown by an underlying Converter
*/
public Object convert(String[] values, Class clazz) {
Class type = clazz;
if (clazz.isArray()) {
type = clazz.getComponentType();
}
if (log.isDebugEnabled()) {
log.debug("Convert String[" + values.length + "] to class '" +
type.getName() + "[]'");
}
Converter converter = lookup(type);
if (converter == null) {
converter = lookup(String.class);
}
if (log.isTraceEnabled()) {
log.trace(" Using converter " + converter);
}
Object array = Array.newInstance(type, values.length);
for (int i = 0; i < values.length; i++) {
Array.set(array, i, converter.convert(type, values[i]));
}
return (array);
}
/**
* <p>Convert the value to an object of the specified class (if
* possible).</p>
*
* @param value Value to be converted (may be null)
* @param targetType Class of the value to be converted to
* @return The converted value
*
* @exception ConversionException if thrown by an underlying Converter
*/
public Object convert(Object value, Class targetType) {
Class sourceType = value == null ? null : value.getClass();
if (log.isDebugEnabled()) {
if (value == null) {
log.debug("Convert null value to type '" +
targetType.getName() + "'");
} else {
log.debug("Convert type '" + sourceType.getName() + "' value '" + value +
"' to type '" + targetType.getName() + "'");
}
}
Object converted = value;
Converter converter = lookup(sourceType, targetType);
if (converter != null) {
if (log.isTraceEnabled()) {
log.trace(" Using converter " + converter);
}
converted = converter.convert(targetType, value);
}
if (targetType == String.class && converted != null &&
!(converted instanceof String)) {
// NOTE: For backwards compatibility, if the Converter
// doesn't handle conversion-->String then
// use the registered String Converter
converter = lookup(String.class);
if (converter != null) {
if (log.isTraceEnabled()) {
log.trace(" Using converter " + converter);
}
converted = converter.convert(String.class, converted);
}
// If the object still isn't a String, use toString() method
if (converted != null && !(converted instanceof String)) {
converted = converted.toString();
}
}
return converted;
}
/**
* Remove all registered {@link Converter}s, and re-establish the
* standard Converters.
*/
public void deregister() {
converters.clear();
registerPrimitives(false);
registerStandard(false, false);
registerOther(true);
registerArrays(false, 0);
register(BigDecimal.class, new BigDecimalConverter());
register(BigInteger.class, new BigIntegerConverter());
}
/**
* Register the provided converters with the specified defaults.
*
* @param throwException <code>true if the converters should
* throw an exception when a conversion error occurs, otherwise <code>
* <code>false if a default value should be used.
* @param defaultNull <code>trueif the standard converters
* (see {@link ConvertUtilsBean#registerStandard(boolean, boolean)})
* should use a default value of <code>null, otherwise
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