com.jgoodies.binding.value.ConverterFactory Maven / Gradle / Ivy
Show all versions of jgoodies-binding Show documentation
/*
* Copyright (c) 2002-2015 JGoodies Software GmbH. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Software GmbH nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.binding.value;
import static com.jgoodies.common.base.Preconditions.checkArgument;
import static com.jgoodies.common.base.Preconditions.checkNotNull;
import java.text.Format;
import java.text.ParseException;
/**
* A factory that vends ValueModels that convert types, for example
* Dates to Strings. More formally, a converting ValueModel VM1
* converts the type T2 of an object being held as a value in
* one ValueModel VM2 into another type T1.
* When reading a value from VM1, instances of T2 are read from VM2
* and are converted to T1. When storing a new value to VM1,
* the type converter will perform the inverse conversion and
* will convert an instance of T1 to T2.
*
* Type converters should be used judiciously. To bind non-Strings
* to a text UI component
* you should favor to use a {@link javax.swing.JFormattedTextField}.
* They provide a powerful means to convert Strings to objects
* and handle many cases that arise around invalid input.
*
* @author Karsten Lentzsch
* @version $Revision: 1.12 $
*
* @see ValueModel
* @see Format
* @see javax.swing.JFormattedTextField
*/
public final class ConverterFactory {
private ConverterFactory() {
// Overrides default constructor; prevents instantiation.
}
// Factory Methods ********************************************************
/**
* Creates and returns a ValueModel that negates Booleans and leaves
* null unchanged.
*
* @param booleanSource a Boolean ValueModel
* @return a ValueModel that inverts Booleans
*
* @throws NullPointerException if the {@code booleanSource} is {@code null}
*/
public static ValueModel createBooleanNegator(ValueModel booleanSource) {
return new ConverterValueModel(
booleanSource,
new BooleanNegator());
}
/**
* Creates and returns a ValueModel that converts Booleans
* to the associated of the two specified strings, and vice versa.
* {@code null} is mapped to an empty string.
* Ignores cases when setting a text.
*
* @param booleanSubject a Boolean ValueModel
* @param trueText the text associated with {@code Boolean.TRUE}
* @param falseText the text associated with {@code Boolean.FALSE}
*
* @return a ValueModel that converts boolean to the associated text
*
* @throws NullPointerException if {@code booleanSource},
* {@code trueText}, {@code falseText} or {@code nullText} is {@code null}
* @throws IllegalArgumentException if {@code trueText} equals {@code falseText}
*/
public static ValueModel createBooleanToStringConverter(
ValueModel booleanSubject,
String trueText,
String falseText) {
return createBooleanToStringConverter(
booleanSubject,
trueText,
falseText,
"");
}
/**
* Creates and returns a ValueModel that converts Booleans
* to the associated of the two specified strings, and vice versa.
* {@code null} is mapped to the specified text.
* Ignores cases when setting a text.
*
* @param booleanSource a Boolean ValueModel
* @param trueText the text associated with {@code Boolean.TRUE}
* @param falseText the text associated with {@code Boolean.FALSE}
* @param nullText the text associated with {@code null}
*
* @return a ValueModel that converts boolean to the associated text
*
* @throws NullPointerException if {@code booleanSource},
* {@code trueText}, {@code falseText} or {@code nullText} is {@code null}
* @throws IllegalArgumentException if {@code trueText} equals {@code falseText}
*/
public static ValueModel createBooleanToStringConverter(
ValueModel booleanSource,
String trueText,
String falseText,
String nullText) {
return new ConverterValueModel(
booleanSource,
new BooleanToStringConverter(trueText, falseText, nullText));
}
/**
* Creates and returns a ValueModel that converts Doubles using the
* specified multiplier.
*
* Examples:
* multiplier=100, Double(1.23) -> Double(123),
* multiplier=1000, Double(1.23) -> Double(1230)
*
* @param doubleSource a Double ValueModel
* @param multiplier the multiplier used for the conversion
*
* @return a ValueModel that converts Doubles using the specified multiplier
*
* @throws NullPointerException if {@code doubleSource} is {@code null}
*
* @since 1.0.2
*/
public static ValueModel createDoubleConverter(
ValueModel doubleSource, double multiplier) {
return new ConverterValueModel(
doubleSource,
new DoubleConverter(multiplier));
}
/**
* Creates and returns a ValueModel that converts Doubles to Integer,
* and vice versa.
*
* @param doubleSource a Double ValueModel
*
* @return a ValueModel that converts Doubles to Integer
*
* @throws NullPointerException if {@code doubleSource} is {@code null}
*/
public static ValueModel createDoubleToIntegerConverter(
ValueModel doubleSource) {
return createDoubleToIntegerConverter(doubleSource, 1);
}
/**
* Creates and returns a ValueModel that converts Doubles to Integer,
* and vice versa. The multiplier can be used to convert Doubles
* to percent, permill, etc. For a percentage, set the multiplier to be 100,
* for a permill, set the multiplier to be 1000.
*
* Examples:
* multiplier=100, Double(1.23) -> Integer(123),
* multiplier=1000, Double(1.23) -> Integer(1230)
*
* @param doubleSource a Double ValueModel
* @param multiplier the multiplier used to convert the Double to Integer
*
* @return a ValueModel that converts Doubles to Integer
*
* @throws NullPointerException if {@code doubleSource} is {@code null}
*/
public static ValueModel createDoubleToIntegerConverter(
ValueModel doubleSource, int multiplier) {
return new ConverterValueModel(
doubleSource,
new DoubleToIntegerConverter(multiplier));
}
/**
* Creates and returns a ValueModel that converts Floats using the
* specified multiplier.
*
* Examples:
* multiplier=100, Float(1.23) -> Float(123),
* multiplier=1000, Float(1.23) -> Float(1230)
*
* @param floatSource a Float ValueModel
* @param multiplier the multiplier used for the conversion
*
* @return a ValueModel that converts Float using the specified multiplier
*
* @throws NullPointerException if {@code floatSource} is {@code null}
*
* @since 1.0.2
*/
public static ValueModel createFloatConverter(
ValueModel floatSource, float multiplier) {
return new ConverterValueModel(
floatSource,
new FloatConverter(multiplier));
}
/**
* Creates and returns a ValueModel that converts Floats to Integer,
* and vice versa.
* s
* @param floatSource a Float ValueModel
*
* @return a ValueModel that converts Floats to Integer
*
* @throws NullPointerException if {@code floatSource} is {@code null}
*/
public static ValueModel createFloatToIntegerConverter(ValueModel floatSource) {
return createFloatToIntegerConverter(floatSource, 1);
}
/**
* Creates and returns a ValueModel that converts Floats to Integer,
* and vice versa. The multiplier can be used to convert Floats
* to percent, permill, etc. For a percentage, set the multiplier to be 100,
* for a permill, set the multiplier to be 1000.
*
* @param floatSource a Float ValueModel
* @param multiplier the multiplier used to convert the Float to Integer
*
* @return a ValueModel that converts Floats to Integer
*
* @throws NullPointerException if {@code floatSource} is {@code null}
*/
public static ValueModel createFloatToIntegerConverter(
ValueModel floatSource, int multiplier) {
return new ConverterValueModel(
floatSource,
new FloatToIntegerConverter(multiplier));
}
/**
* Creates and returns a ValueModel that converts Integers using the
* specified multiplier.
*
* Examples: multiplier=100, Integer(3) -> Integer(300),
* multiplier=1000, Integer(3) -> Integer(3000)
*
* @param integerSource a Integer ValueModel
* @param multiplier the multiplier used for the conversion
*
* @return a ValueModel that converts Integers using the specified multiplier
*
* @throws NullPointerException if {@code integerSource} is {@code null}
*
* @since 1.0.2
*/
public static ValueModel createIntegerConverter(
ValueModel integerSource, double multiplier) {
return new ConverterValueModel(
integerSource,
new IntegerConverter(multiplier));
}
/**
* Creates and returns a ValueModel that converts Long using the
* specified multiplier.
*
* Examples: multiplier=100, Long(3) -> Long(300),
* multiplier=1000, Long(3) -> Long(3000)
*
* @param longSource a Long ValueModel
* @param multiplier the multiplier used for the conversion
*
* @return a ValueModel that converts Longs using the specified multiplier
*
* @throws NullPointerException if {@code longSource} is {@code null}
*
* @since 1.0.2
*/
public static ValueModel createLongConverter(
ValueModel longSource, double multiplier) {
return new ConverterValueModel(
longSource,
new LongConverter(multiplier));
}
/**
* Creates and returns a ValueModel that converts Longs to Integer
* and vice versa.
*
* Constraints: The subject is of type {@code Long},
* values written to the converter are of type {@code Integer}.
*
* @param longSubject a Long ValueModel
* @return a ValueModel that converts Longs to Integer
*
* @throws NullPointerException if the subject is {@code null}
*/
public static ValueModel createLongToIntegerConverter(ValueModel longSubject) {
return createLongToIntegerConverter(longSubject, 1);
}
/**
* Creates and returns a ValueModel that converts Longs to Integer
* and vice versa.
*
* Constraints: The subject is of type {@code Long},
* values written to the converter are of type {@code Integer}.
*
* @param longSource a Long ValueModel
* @param multiplier used to multiply the Long when converting to Integer
* @return a ValueModel that converts Longs to Integer
*
* @throws NullPointerException if {@code longSource} is {@code null}
*/
public static ValueModel createLongToIntegerConverter(
ValueModel longSource, int multiplier) {
return new ConverterValueModel(
longSource,
new LongToIntegerConverter(multiplier));
}
/**
* Creates and returns a ValueModel that converts objects to Strings
* and vice versa. The conversion is performed by a {@code Format}.
*
* Constraints: The source is of type {@code Object};
* it must be formattable and parsable via the given {@code Format}.
*
* @param source the underlying ValueModel.
* @param format the {@code Format} used to format and parse
*
* @return a ValueModel that converts objects to Strings and vice versa
*
* @throws NullPointerException if {@code source} or {@code format}
* is {@code null}
*/
public static ValueModel createStringConverter(ValueModel source, Format format) {
return new ConverterValueModel(
source, new StringConverter(format));
}
// Converter Implementations **********************************************
/**
* Negates Booleans leaving null unchanged. Maps Boolean.TRUE
* to Boolean.FALSE, Boolean.FALSE to Boolean.TRUE, and null to null.
*/
public static final class BooleanNegator
implements BindingConverter {
/**
* Returns the negated source Boolean leaving null unchanged.
*/
@Override
public Boolean targetValue(Boolean sourceValue) {
return negate(sourceValue);
}
/**
* Returns the negated target Boolean leaving null unchanged.
*/
@Override
public Boolean sourceValue(Boolean targetValue) {
return negate(targetValue);
}
/**
* Negates Booleans leaving null unchanged.
* Maps Boolean.TRUE to Boolean.FALSE ,
* Boolean.FALSE to Boolean.TRUE, and null to null.
*
* @param value the value to invert
* @return the inverted Boolean value, or null if value is null
*/
private static Boolean negate(Boolean value) {
return value == null
? null
: Boolean.valueOf(!value.booleanValue());
}
}
/**
* Converts Booleans to Strings and vice-versa using given texts for
* true, false, and null.
*/
public static final class BooleanToStringConverter
implements BindingConverter {
private final String trueText;
private final String falseText;
private final String nullText;
BooleanToStringConverter(
String trueText,
String falseText,
String nullText) {
this.trueText = checkNotNull(trueText, "The trueText must not be null.");
this.falseText = checkNotNull(falseText, "The falseText must not be null.");
this.nullText = checkNotNull(nullText, "The nullText must not be null.");
checkArgument(!trueText.equals(falseText),
"The trueText and falseText must be different.");
}
/**
* Returns the source value's associated text representation.
*/
@Override
public String targetValue(Boolean sourceValue) {
if (sourceValue == null) {
return nullText;
}
return sourceValue.booleanValue()
? trueText
: falseText;
}
/**
* Converts the given String and sets the associated Boolean as
* the subject's new value. In case the new value equals neither
* this class' trueText, nor the falseText, nor the nullText,
* an IllegalArgumentException is thrown.
*
* @throws IllegalArgumentException if the new value does neither match
* the trueText nor the falseText nor the nullText
*/
@Override
public Boolean sourceValue(String targetValue) {
if (trueText.equalsIgnoreCase(targetValue)) {
return Boolean.TRUE;
} else if (falseText.equalsIgnoreCase(targetValue)) {
return Boolean.FALSE;
} else if (nullText.equalsIgnoreCase(targetValue)) {
return null;
} else {
throw new IllegalArgumentException(
"The new value must be one of: "
+ trueText + '/'
+ falseText + '/'
+ nullText);
}
}
}
/**
* Converts Doubles using a given multiplier.
*/
public static final class DoubleConverter
implements BindingConverter {
private final double multiplier;
DoubleConverter(double multiplier) {
this.multiplier = multiplier;
}
/**
* Converts the subject's value and returns a
* corresponding {@code Double} using the multiplier.
*
* @param sourceValue the subject's value
* @return the converted subjectValue
*/
@Override
public Double targetValue(Double sourceValue) {
return Double.valueOf(sourceValue.doubleValue() * multiplier);
}
/**
* Converts a {@code Double} using the multiplier
* and sets it as new value.
*
* @param targetValue the {@code Double} object that shall be converted
*/
@Override
public Double sourceValue(Double targetValue) {
return Double.valueOf(targetValue.doubleValue() / multiplier);
}
}
/**
* Converts Doubles to Integers and vice-versa.
*/
public static final class DoubleToIntegerConverter
implements BindingConverter {
private final int multiplier;
DoubleToIntegerConverter(int multiplier) {
this.multiplier = multiplier;
}
/**
* Converts the source value and returns a
* corresponding {@code Integer} value using the multiplier.
*
* @param sourceValue the subject's value
* @return the converted subjectValue
*/
@Override
public Integer targetValue(Double sourceValue) {
double doubleValue = sourceValue.doubleValue();
if (multiplier != 1) {
doubleValue *= multiplier;
}
return Integer.valueOf((int) Math.round(doubleValue));
}
/**
* Converts a {@code Double} using the multiplier
* and sets it as new value.
*
* @param targetValue the {@code Integer} object that shall
* be converted
*/
@Override
public Double sourceValue(Integer targetValue) {
double doubleValue = targetValue.doubleValue();
if (multiplier != 1) {
doubleValue /= multiplier;
}
return Double.valueOf(doubleValue);
}
}
/**
* Converts Floats using a given multiplier.
*/
public static final class FloatConverter
implements BindingConverter {
private final float multiplier;
FloatConverter(float multiplier) {
this.multiplier = multiplier;
}
/**
* Converts the subject's value and returns a
* corresponding {@code Float} using the multiplier.
*
* @param sourceValue the subject's value
* @return the converted subjectValue
*/
@Override
public Float targetValue(Float sourceValue) {
float floatValue = sourceValue.floatValue();
return Float.valueOf(floatValue * multiplier);
}
/**
* Converts a {@code Float} using the multiplier
* and sets it as new value.
*
* @param targetValue the {@code Float} object that shall be converted
*/
@Override
public Float sourceValue(Float targetValue) {
float floatValue = targetValue.floatValue();
return Float.valueOf(floatValue / multiplier);
}
}
/**
* Converts Floats to Integers and vice-versa.
*/
public static final class FloatToIntegerConverter
implements BindingConverter {
private final int multiplier;
FloatToIntegerConverter(int multiplier) {
this.multiplier = multiplier;
}
/**
* @return an Integer that is the Float source value
* multiplied with this converter's multiplier
*/
@Override
public Integer targetValue(Float sourceValue) {
float floatValue = sourceValue.floatValue();
if (multiplier != 1) {
floatValue *= multiplier;
}
return Integer.valueOf(Math.round(floatValue));
}
/**
* Converts a {@code Float} using the multiplier.
*/
@Override
public Float sourceValue(Integer sourceValue) {
float floatValue = sourceValue.floatValue();
if (multiplier != 1) {
floatValue /= multiplier;
}
return Float.valueOf(floatValue);
}
}
/**
* Converts Longs using a given multiplier.
*/
public static final class LongConverter
implements BindingConverter {
private final double multiplier;
LongConverter(double multiplier) {
this.multiplier = multiplier;
}
/**
* Converts the subject's value and returns a
* corresponding {@code Long} using the multiplier.
*/
@Override
public Long targetValue(Long sourceValue) {
double doubleValue = sourceValue.doubleValue();
return Long.valueOf((long) (doubleValue * multiplier));
}
/**
* Converts a {@code Long} using the multiplier
* and sets it as new value.
*/
@Override
public Long sourceValue(Long targetValue) {
double doubleValue = targetValue.doubleValue();
return Long.valueOf((long) (doubleValue / multiplier));
}
}
/**
* Converts Integers using a given multiplier.
*/
public static final class IntegerConverter
implements BindingConverter {
private final double multiplier;
IntegerConverter(double multiplier) {
this.multiplier = multiplier;
}
/**
* Returns an Integer that is the source Integer
* multiplied with this converters' multiplier.
*/
@Override
public Integer targetValue(Integer sourceValue) {
double doubleValue = sourceValue.doubleValue();
return Integer.valueOf((int) (doubleValue * multiplier));
}
/**
* Returns an Integer that is the target Integer
* divided by this converters' multiplier.
*/
@Override
public Integer sourceValue(Integer targetValue) {
double doubleValue = targetValue.doubleValue();
return Integer.valueOf((int) (doubleValue / multiplier));
}
}
/**
* Converts Longs to Integers and vice-versa.
*/
public static final class LongToIntegerConverter
implements BindingConverter {
private final int multiplier;
LongToIntegerConverter(int multiplier) {
this.multiplier = multiplier;
}
/**
* Returns an Integer that is the source Long
* multiplied with this converter's multiplier.
*/
@Override
public Integer targetValue(Long sourceValue) {
int intValue = sourceValue.intValue();
if (multiplier != 1) {
intValue *= multiplier;
}
return Integer.valueOf(intValue);
}
/**
* Returns a Long that is the target Integer
* divided by this converter's multiplier.
*
* @param targetValue the {@code Integer} object that represents
* the percent value
*/
@Override
public Long sourceValue(Integer targetValue) {
long longValue = targetValue.longValue();
if (multiplier != 1) {
longValue /= multiplier;
}
return Long.valueOf(longValue);
}
}
/**
* Converts Values to Strings and vice-versa using a given Format.
*/
public static final class StringConverter
implements BindingConverter {
/**
* Holds the {@code Format} used to format and parse.
*/
private final Format format;
// Instance Creation **************************************************
/**
* Constructs a {@code StringConverter} using the specified {@code Format}.
*
* @param format the {@code Format} used to format and parse
* @throws NullPointerException if the format is {@code null}.
*/
StringConverter(Format format) {
this.format = checkNotNull(format, "The format must not be null.");
}
// Implementing Abstract Behavior *************************************
/**
* Formats the source value and returns a String representation.
*
* @param sourceValue the source value
* @return the formatted sourceValue
*/
@Override
public String targetValue(Object sourceValue) {
return format.format(sourceValue);
}
/**
* Parses the given String encoding and returns the parsed object.
* {@code ParseException}s are re-thrown as IllegalArgumentException.
*
* @param targetValue the value to be converted and set as new subject value
*/
@Override
public Object sourceValue(String targetValue) {
try {
return format.parseObject(targetValue);
} catch (ParseException e) {
throw new IllegalArgumentException("Cannot parse the target value " + targetValue, e);
}
}
}
}