Java tutorial
/** * OpenSpotLight - Open Source IT Governance Platform * * Copyright (c) 2009, CARAVELATECH CONSULTORIA E TECNOLOGIA EM INFORMATICA LTDA * or third-party contributors as indicated by the @author tags or express * copyright attribution statements applied by the authors. All third-party * contributions are distributed under license by CARAVELATECH CONSULTORIA E * TECNOLOGIA EM INFORMATICA LTDA. * * This copyrighted material is made available to anyone wishing to use, modify, * copy, or redistribute it subject to the terms and conditions of the GNU * Lesser General Public License, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * See the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this distribution; if not, write to: * Free Software Foundation, Inc. * 51 Franklin Street, Fifth Floor * Boston, MA 02110-1301 USA * *********************************************************************** * OpenSpotLight - Plataforma de Governana de TI de Cdigo Aberto * * Direitos Autorais Reservados (c) 2009, CARAVELATECH CONSULTORIA E TECNOLOGIA * EM INFORMATICA LTDA ou como contribuidores terceiros indicados pela etiqueta * @author ou por expressa atribuio de direito autoral declarada e atribuda pelo autor. * Todas as contribuies de terceiros esto distribudas sob licena da * CARAVELATECH CONSULTORIA E TECNOLOGIA EM INFORMATICA LTDA. * * Este programa software livre; voc pode redistribu-lo e/ou modific-lo sob os * termos da Licena Pblica Geral Menor do GNU conforme publicada pela Free Software * Foundation. * * Este programa distribudo na expectativa de que seja til, porm, SEM NENHUMA * GARANTIA; nem mesmo a garantia implcita de COMERCIABILIDADE OU ADEQUAO A UMA * FINALIDADE ESPEC?FICA. Consulte a Licena Pblica Geral Menor do GNU para mais detalhes. * * Voc deve ter recebido uma cpia da Licena Pblica Geral Menor do GNU junto com este * programa; se no, escreva para: * Free Software Foundation, Inc. * 51 Franklin Street, Fifth Floor * Boston, MA 02110-1301 USA */ package org.openspotlight.common.util; import java.lang.reflect.Field; import java.math.BigDecimal; import java.math.BigInteger; import java.text.MessageFormat; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.apache.commons.beanutils.Converter; 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.CharacterConverter; import org.apache.commons.beanutils.converters.DoubleConverter; 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.openspotlight.common.exception.SLException; import org.openspotlight.common.exception.SLRuntimeException; /** * Utility conversion class based on PrimitiveOrWrapperConverter from Dozer project http://dozer.sourceforge.net/ * * @author Luiz Fernando Teston - feu.teston@caravelatech.com */ public class Conversion { /** * Internal map of types and converters. */ private static final Map<Class<?>, Converter> CONVERTERS = new HashMap<Class<?>, Converter>(); private static final Map<String, Class<?>> PRIMITIVE_TYPES = new HashMap<String, Class<?>>(); /** * Should not be instantiated */ private Conversion() { Exceptions.logAndThrow(new IllegalStateException(Messages.getString("invalidConstructor"))); //$NON-NLS-1$ } static { Conversion.PRIMITIVE_TYPES.put("int", int.class); Conversion.PRIMITIVE_TYPES.put("double", double.class); Conversion.PRIMITIVE_TYPES.put("short", short.class); Conversion.PRIMITIVE_TYPES.put("char", char.class); Conversion.PRIMITIVE_TYPES.put("long", long.class); Conversion.PRIMITIVE_TYPES.put("boolean", boolean.class); Conversion.PRIMITIVE_TYPES.put("byte", byte.class); Conversion.PRIMITIVE_TYPES.put("float", float.class); } static { Conversion.CONVERTERS.put(Integer.class, new IntegerConverter()); Conversion.CONVERTERS.put(Double.class, new DoubleConverter()); Conversion.CONVERTERS.put(Short.class, new ShortConverter()); Conversion.CONVERTERS.put(Character.class, new CharacterConverter()); Conversion.CONVERTERS.put(Long.class, new LongConverter()); Conversion.CONVERTERS.put(Boolean.class, new BooleanConverter()); Conversion.CONVERTERS.put(Byte.class, new ByteConverter()); Conversion.CONVERTERS.put(Float.class, new FloatConverter()); Conversion.CONVERTERS.put(Date.class, new Converter() { @Override public Object convert(final Class type, final Object value) { try { if (type.equals(Date.class) && value instanceof String && ((String) value).isEmpty() == false) { final String newValue = (String) value; return new Date(Long.parseLong(newValue)); } } catch (final Exception e) { throw Exceptions.logAndReturn(new IllegalStateException(e)); } throw Exceptions.logAndReturn(new IllegalArgumentException()); } }); Conversion.CONVERTERS.put(String.class, new Converter() { @Override public Object convert(final Class type, final Object value) { try { if (value == null) { return null; } if (type.equals(String.class) && value instanceof Date) { return Long.toString(((Date) value).getTime()); } if (type.equals(String.class) && value instanceof Class) { return ((Class) value).getName(); } if (type.equals(String.class) && value instanceof byte[]) { return new String((byte[]) value); } return value.toString(); } catch (final Exception e) { throw Exceptions.logAndReturn(new IllegalStateException(e)); } } }); Conversion.CONVERTERS.put(int.class, new IntegerConverter()); Conversion.CONVERTERS.put(double.class, new DoubleConverter()); Conversion.CONVERTERS.put(short.class, new ShortConverter()); Conversion.CONVERTERS.put(char.class, new CharacterConverter()); Conversion.CONVERTERS.put(long.class, new LongConverter()); Conversion.CONVERTERS.put(boolean.class, new BooleanConverter()); Conversion.CONVERTERS.put(byte.class, new ByteConverter()); Conversion.CONVERTERS.put(float.class, new FloatConverter()); Conversion.CONVERTERS.put(BigDecimal.class, new BigDecimalConverter()); Conversion.CONVERTERS.put(BigInteger.class, new BigIntegerConverter()); Conversion.CONVERTERS.put(Class.class, new Converter() { @Override public Object convert(final Class type, final Object value) { try { if (type.equals(Class.class) && value instanceof String) { String newValue = (String) value; if (newValue.startsWith("class ")) { newValue = Strings.removeBegginingFrom("class ", newValue); } return Class.forName(newValue); } } catch (final Exception e) { throw Exceptions.logAndReturn(new IllegalStateException(e)); } throw Exceptions.logAndReturn(new IllegalArgumentException()); } }); } /** * Returns a new converted type based on target type parameter. * * @param <E> * @param rawValue * @param targetType * @return a new value from a converted type * @throws SLException */ @SuppressWarnings("unchecked") public static <E> E convert(final Object rawValue, final Class<E> targetType) { Assertions.checkNotNull("targetType", targetType); //$NON-NLS-1$ Assertions.checkCondition("validTargetType:" + targetType.getName(), //$NON-NLS-1$ Conversion.CONVERTERS.containsKey(targetType) || targetType.isEnum()); if (rawValue == null) { return null; } try { if (targetType.isEnum()) { final String rawValueAsString = rawValue.toString(); final Field[] flds = targetType.getDeclaredFields(); for (final Field f : flds) { if (f.isEnumConstant()) { if (f.getName().equals(rawValueAsString)) { final Object value = f.get(null); return (E) value; } } } throw new IllegalStateException(MessageFormat.format("Invalid enum constant:{0} for type {1}", rawValueAsString, targetType)); } final Converter converter = Conversion.CONVERTERS.get(targetType); final E converted = (E) converter.convert(targetType, rawValue); return converted; } catch (final Exception e) { throw Exceptions.logAndReturnNew(e, SLRuntimeException.class); } } public static Class<?> getPrimitiveClass(final String name) { return Conversion.PRIMITIVE_TYPES.get(name); } }