Java tutorial
/*
* Copyright 2004, 2005, 2006 Odysseus Software GmbH
*
* Licensed 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.
*/
import java.text.DateFormat;
import java.text.Format;
import java.text.ParseException;
import java.text.ParsePosition;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.math.BigDecimal;
import java.math.BigInteger;
/**
* Parse basic types.
*
* @author Christoph Beck
*/
public class ParseUtils {
private static Locale locale = Locale.US;
private static Object nullValue(Class type) {
if (type.isPrimitive()) {
if (type == boolean.class)
return Boolean.FALSE;
if (type == byte.class)
return new Byte((byte) 0);
if (type == char.class)
return new Character((char) 0);
if (type == short.class)
return new Short((short) 0);
if (type == int.class)
return new Integer(0);
if (type == long.class)
return new Long(0);
if (type == float.class)
return new Float(0);
if (type == double.class)
return new Double(0);
}
return null;
}
private static Class objectType(Class type) {
if (type.isPrimitive()) {
if (type == boolean.class)
return Boolean.class;
if (type == byte.class)
return Byte.class;
if (type == char.class)
return Character.class;
if (type == short.class)
return Short.class;
if (type == int.class)
return Integer.class;
if (type == long.class)
return Long.class;
if (type == float.class)
return Float.class;
if (type == double.class)
return Double.class;
}
return type;
}
private static Object parse(Format format, String value) throws ParseException {
ParsePosition pos = new ParsePosition(0);
Object result = format.parseObject(value, pos);
if (pos.getIndex() < value.length())
throw new ParseException("Cannot parse " + value + " (garbage suffix)!", pos.getIndex());
return result;
}
private static Date parseDate(String value) throws ParseException {
DateFormat format = DateFormat.getDateInstance(DateFormat.SHORT, locale);
format.setTimeZone(TimeZone.getTimeZone("GMT"));
return (Date) parse(format, value);
}
private static Boolean parseBoolean(String value) throws ParseException {
if ("true".equals(value)) {
return Boolean.TRUE;
} else if ("false".equals(value)) {
return Boolean.FALSE;
} else {
throw new ParseException("Cannot parse '" + value + "' as boolean", 0);
}
}
private static Character parseCharacter(String value) throws ParseException {
if (value.length() != 1) {
throw new ParseException("Cannot parse '" + value + "' as character", value.length());
}
return new Character(value.charAt(0));
}
/**
* Parse value of specified type. The string value has to be in
* standard notation for the specified type.
*/
public static Object parse(Class type, String value) throws Exception {
if (value == null) {
return nullValue(type);
} else if (value.length() == 0) {
return type == String.class ? value : nullValue(type);
}
type = objectType(type);
if (type == BigDecimal.class) {
return new BigDecimal(value);
} else if (type == BigInteger.class) {
return new BigInteger(value);
} else if (type == Boolean.class) {
return parseBoolean(value);
} else if (type == Byte.class) {
return Byte.valueOf(value);
} else if (type == Character.class) {
return parseCharacter(value);
} else if (type == Date.class) {
return parseDate(value);
} else if (type == Double.class) {
return Double.valueOf(value);
} else if (type == Float.class) {
return Float.valueOf(value);
} else if (type == Integer.class) {
return Integer.valueOf(value);
} else if (type == Long.class) {
return Long.valueOf(value);
} else if (type == Short.class) {
return Short.valueOf(value);
} else if (type == String.class) {
return value;
}
throw new ParseException("Cannot parse type " + type, 0);
}
}
///////////////////////
/*
* Copyright 2004, 2005, 2006 Odysseus Software GmbH
*
* Licensed 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 de.odysseus.calyxo.base.util;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Date;
import junit.framework.TestCase;
/**
* ParseUtils test case.
*
* @author Christoph Beck
*/
public class ParseUtilsTest extends TestCase {
/**
* Constructor for ParseUtilsTest.
* @param arg0
*/
public ParseUtilsTest(String arg0) {
super(arg0);
}
public void testNullPrimitive() throws Exception {
assertEquals(Boolean.FALSE, ParseUtils.parse(boolean.class, null));
assertEquals(new Character((char) 0), ParseUtils.parse(char.class, null));
assertEquals(new Byte((byte) 0), ParseUtils.parse(byte.class, null));
assertEquals(new Short((short) 0), ParseUtils.parse(short.class, null));
assertEquals(new Integer(0), ParseUtils.parse(int.class, null));
assertEquals(new Long(0), ParseUtils.parse(long.class, null));
assertEquals(new Float(0), ParseUtils.parse(float.class, null));
assertEquals(new Double(0), ParseUtils.parse(double.class, null));
}
public void testPrimitive() throws Exception {
assertEquals(Boolean.TRUE, ParseUtils.parse(boolean.class, "true"));
assertEquals(Boolean.FALSE, ParseUtils.parse(boolean.class, "false"));
assertEquals(new Character((char) 10), ParseUtils.parse(char.class, "\n"));
assertEquals(new Byte((byte) 10), ParseUtils.parse(byte.class, "10"));
assertEquals(new Short((short) 10), ParseUtils.parse(short.class, "10"));
assertEquals(new Integer(10), ParseUtils.parse(int.class, "10"));
assertEquals(new Long(10), ParseUtils.parse(long.class, "10"));
assertEquals(new Float(10), ParseUtils.parse(float.class, "10"));
assertEquals(new Double(10), ParseUtils.parse(double.class, "10"));
}
public void testNullObject() throws Exception {
assertNull(ParseUtils.parse(Boolean.class, null));
assertNull(ParseUtils.parse(Byte.class, null));
assertNull(ParseUtils.parse(Character.class, null));
assertNull(ParseUtils.parse(Short.class, null));
assertNull(ParseUtils.parse(Integer.class, null));
assertNull(ParseUtils.parse(Long.class, null));
assertNull(ParseUtils.parse(Float.class, null));
assertNull(ParseUtils.parse(Double.class, null));
assertNull(ParseUtils.parse(BigInteger.class, null));
assertNull(ParseUtils.parse(BigDecimal.class, null));
assertNull(ParseUtils.parse(Date.class, null));
assertNull(ParseUtils.parse(String.class, null));
}
public void testObject() throws Exception {
assertEquals(Boolean.TRUE, ParseUtils.parse(Boolean.class, "true"));
assertEquals(Boolean.FALSE, ParseUtils.parse(Boolean.class, "false"));
assertEquals(new Character((char) 10), ParseUtils.parse(Character.class, "\n"));
assertEquals(new Byte((byte) 10), ParseUtils.parse(Byte.class, "10"));
assertEquals(new Short((short) 10), ParseUtils.parse(Short.class, "10"));
assertEquals(new Integer(10), ParseUtils.parse(Integer.class, "10"));
assertEquals(new Long(10), ParseUtils.parse(Long.class, "10"));
assertEquals(new Float(10), ParseUtils.parse(Float.class, "10"));
assertEquals(new Double(10), ParseUtils.parse(Double.class, "10"));
assertEquals(new BigInteger("10"), ParseUtils.parse(BigInteger.class, "10"));
assertEquals(new BigDecimal(10), ParseUtils.parse(BigDecimal.class, "10"));
assertEquals(new Date(0), ParseUtils.parse(Date.class, "1/1/70"));
assertEquals("foo", ParseUtils.parse(String.class, "foo"));
}
public void testBadValues() throws Exception {
try {
ParseUtils.parse(Boolean.class, "no");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Character.class, "10");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Byte.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Short.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Integer.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Long.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Float.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Double.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(BigInteger.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(BigDecimal.class, "abc");
fail("Exception expected");
} catch (Exception e) {
}
try {
ParseUtils.parse(Date.class, "1.1.70");
fail("Exception expected");
} catch (Exception e) {
}
}
public void testBadType() throws Exception {
try {
ParseUtils.parse(Cloneable.class, "dolly");
fail("Exception expected");
} catch (Exception e) {
}
}
public static void main(String[] args) {
junit.textui.TestRunner.run(ParseUtilsTest.class);
}
}