Java tutorial
/* * ==================================================================== * * Frame2 Open Source License * * Copyright (c) 2004-2007 Megatome Technologies. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. 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. * * 3. The end-user documentation included with the redistribution, if * any, must include the following acknowlegement: * "This product includes software developed by * Megatome Technologies." * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "The Frame2 Project", and "Frame2", * must not be used to endorse or promote products derived * from this software without prior written permission. For written * permission, please contact iamthechad@sourceforge.net. * * 5. Products derived from this software may not be called "Frame2" * nor may "Frame2" appear in their names without prior written * permission of Megatome Technologies. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 MEGATOME TECHNOLOGIES OR * ITS 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 org.megatome.frame2.introspector; import java.math.BigDecimal; import java.math.BigInteger; import java.util.HashMap; import java.util.Map; import org.apache.commons.fileupload.FileItem; import org.megatome.frame2.log.Logger; import org.megatome.frame2.log.LoggerFactory; /** * The Converter class encapsulates the conversion of types for the purpose of * the introspector's setting of properties. */ final class Converter { private static final Logger LOGGER = LoggerFactory.instance(Converter.class.getName()); static private Map<Class<?>, TypeConverter> converterMap = new HashMap<Class<?>, TypeConverter>(); static { converterMap.put(BigDecimal.class, new BigDecimalConverter()); converterMap.put(BigDecimal[].class, new BigDecimalConverter()); converterMap.put(BigInteger.class, new BigIntegerConverter()); converterMap.put(BigInteger[].class, new BigIntegerConverter()); converterMap.put(Boolean.TYPE, new BooleanConverter()); converterMap.put(Boolean.class, new BooleanConverter()); converterMap.put(Boolean[].class, new BooleanConverter()); converterMap.put(Byte.TYPE, new ByteConverter()); converterMap.put(Byte.class, new ByteConverter()); converterMap.put(Byte[].class, new ByteConverter()); converterMap.put(Character.TYPE, new CharacterConverter()); converterMap.put(Character.class, new CharacterConverter()); converterMap.put(Character[].class, new CharacterConverter()); converterMap.put(Double.TYPE, new DoubleConverter()); converterMap.put(Double.class, new DoubleConverter()); converterMap.put(Double[].class, new DoubleConverter()); converterMap.put(Float.TYPE, new FloatConverter()); converterMap.put(Float.class, new FloatConverter()); converterMap.put(Float[].class, new FloatConverter()); converterMap.put(Integer.TYPE, new IntegerConverter()); converterMap.put(Integer.class, new IntegerConverter()); converterMap.put(Integer[].class, new IntegerConverter()); converterMap.put(Long.TYPE, new LongConverter()); converterMap.put(Long.class, new LongConverter()); converterMap.put(Long[].class, new LongConverter()); converterMap.put(Short.TYPE, new ShortConverter()); converterMap.put(Short.class, new ShortConverter()); converterMap.put(Short[].class, new ShortConverter()); converterMap.put(StringBuffer.class, new StringBufferConverter()); converterMap.put(StringBuffer[].class, new StringBufferConverter()); converterMap.put(String.class, new StringConverter()); converterMap.put(String[].class, new StringConverter()); } private Converter() { // Non-public ctor } static Object convertValueToType(Object value, Class<?> type) throws Exception { if ((value == null) || (type == null)) { return null; } if (value.getClass() == type) { return value; } if (value instanceof FileItem) { return value; } String strValue = null; if (value instanceof String) { strValue = (String) value; } else { strValue = String.valueOf(value); LOGGER.warn("Trying to convert from a non String type. Results may be varied."); //$NON-NLS-1$ } TypeConverter converter = converterMap.get(type); if (type.isEnum()) { converter = new EnumConverter(); } if (converter != null) { if (type.isEnum()) { ((EnumConverter) converter).setType(type); } return converter.convert(strValue); } return null; } static Object convertValueToArrayType(Object value, Class<?> type) throws Exception { if ((value == null) || (type == null)) { return null; } if (value.getClass() == type) { return value; } if (value instanceof FileItem) { return new FileItem[] { (FileItem) value }; } String strValue = null; if (value instanceof String) { strValue = (String) value; } else { throw new IllegalArgumentException("Conversion from non-string types not supported"); //$NON-NLS-1$ } TypeConverter converter = converterMap.get(type); if (converter != null) { return converter.convertToArray(strValue); } return null; } static class StringConverter implements TypeConverter { public Object convert(String fromString) { return fromString; } public Object[] convertToArray(String fromString) { return new String[] { fromString }; } } static class IntegerConverter implements TypeConverter { public Object convert(String fromString) { return new Integer(fromString.trim()); } public Object[] convertToArray(String fromString) { return new Integer[] { new Integer(fromString.trim()) }; } } static class StringBufferConverter implements TypeConverter { public Object convert(String fromString) { return new StringBuffer(fromString); } public Object[] convertToArray(String fromString) { return new StringBuffer[] { new StringBuffer(fromString) }; } } static class FloatConverter implements TypeConverter { public Object convert(String fromString) { return new Float(fromString.trim()); } public Object[] convertToArray(String fromString) { return new Float[] { new Float(fromString.trim()) }; } } static class DoubleConverter implements TypeConverter { public Object convert(String fromString) { return new Double(fromString.trim()); } public Object[] convertToArray(String fromString) { return new Double[] { new Double(fromString.trim()) }; } } static class ByteConverter implements TypeConverter { public Object convert(String fromString) { return new Byte(fromString); } public Object[] convertToArray(String fromString) { return new Byte[] { new Byte(fromString) }; } } static class CharacterConverter implements TypeConverter { public Object convert(String fromString) { return Character.valueOf(fromString.charAt(0)); } public Object[] convertToArray(String fromString) { return new Character[] { Character.valueOf(fromString.charAt(0)) }; } } static class ShortConverter implements TypeConverter { public Object convert(String fromString) { return new Short(fromString.trim()); } public Object[] convertToArray(String fromString) { return new Short[] { new Short(fromString.trim()) }; } } static class BooleanConverter implements TypeConverter { public Object convert(String fromString) { return Boolean.valueOf(fromString.trim()); } public Object[] convertToArray(String fromString) { return new Boolean[] { Boolean.valueOf(fromString.trim()) }; } } static class LongConverter implements TypeConverter { public Object convert(String fromString) { return new Long(fromString.trim()); } public Object[] convertToArray(String fromString) { return new Long[] { new Long(fromString.trim()) }; } } static class BigIntegerConverter implements TypeConverter { public Object convert(String fromString) { return new BigInteger(fromString.trim()); } public Object[] convertToArray(String fromString) { return new BigInteger[] { new BigInteger(fromString.trim()) }; } } static class BigDecimalConverter implements TypeConverter { public Object convert(String fromString) { return new BigDecimal(fromString.trim()); } public Object[] convertToArray(String fromString) { return new BigDecimal[] { new BigDecimal(fromString.trim()) }; } } }