org.apache.cayenne.util.ConversionUtil Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
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package org.apache.cayenne.util;
import java.math.BigDecimal;
import java.math.BigInteger;
import org.apache.cayenne.exp.ExpressionException;
/**
* A collection of static conversion utility methods.
*
* @since 1.1
*/
public class ConversionUtil {
public static int toInt(Object object, int defaultValue) {
if (object == null) {
return defaultValue;
}
else if (object instanceof Number) {
return ((Number) object).intValue();
}
else if (object instanceof String) {
try {
return Integer.parseInt((String) object);
}
catch (NumberFormatException ex) {
return defaultValue;
}
}
return defaultValue;
}
/**
* @since 3.1
*/
public static long toLong(Object object, long defaultValue) {
if (object == null) {
return defaultValue;
}
else if (object instanceof Number) {
return ((Number) object).longValue();
}
else if (object instanceof String) {
try {
return Long.parseLong((String) object);
}
catch (NumberFormatException ex) {
return defaultValue;
}
}
return defaultValue;
}
public static boolean toBoolean(Object object) {
if (object instanceof Boolean) {
return ((Boolean) object).booleanValue();
}
if (object instanceof Number) {
return ((Number) object).intValue() != 0;
}
return object != null;
}
public static BigDecimal toBigDecimal(Object object) {
if (object == null) {
return null;
}
else if (object instanceof BigDecimal) {
return (BigDecimal) object;
}
else if (object instanceof BigInteger) {
return new BigDecimal((BigInteger) object);
}
else if (object instanceof Number) {
return new BigDecimal(((Number) object).doubleValue());
}
throw new ExpressionException("Can't convert to BigDecimal: " + object);
}
/**
* Attempts to convert an object to Comparable instance.
*/
public static Comparable toComparable(Object object) {
if (object == null) {
return null;
}
else if (object instanceof Comparable) {
return (Comparable) object;
}
else if (object instanceof StringBuffer) {
return object.toString();
}
else if (object instanceof char[]) {
return new String((char[]) object);
}
else {
throw new ClassCastException(
"Invalid Comparable class:" + object.getClass().getName());
}
}
/**
* Attempts to convert an object to Comparable instance.
*/
public static String toString(Object object) {
if (object == null) {
return null;
}
else if (object instanceof String) {
return (String) object;
}
else if (object instanceof StringBuffer) {
return object.toString();
}
else if (object instanceof char[]) {
return new String((char[]) object);
}
else {
throw new ClassCastException(
"Invalid class for String conversion:" + object.getClass().getName());
}
}
/**
* Attempts to convert an object to an uppercase string.
*/
public static Object toUpperCase(Object object) {
if ((object instanceof String) || (object instanceof StringBuffer)) {
return object.toString().toUpperCase();
}
else if (object instanceof char[]) {
return new String((char[]) object).toUpperCase();
}
else {
return object;
}
}
private ConversionUtil() {
}
}