Data type conversion
/* * * The ObjectStyle Group Software License, version 1.1 * ObjectStyle Group - http://objectstyle.org/ * * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors * of the software. 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 independent contributors * and hosted on ObjectStyle Group web site (http://objectstyle.org/)." * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse * or promote products derived from this software without prior written * permission. For written permission, email * "andrus at objectstyle dot org". * * 5. Products derived from this software may not be called "ObjectStyle" * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their * names without prior written permission. * * 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 THE OBJECTSTYLE GROUP 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. * * * This software consists of voluntary contributions made by many * individuals and hosted on ObjectStyle Group web site. For more * information on the ObjectStyle Group, please see * <http://objectstyle.org/>. */ import java.math.BigDecimal; import java.math.BigInteger; /** * A collection of static conversion utility methods. * * @since 1.1 * @author Andrei Adamchik */ public final 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; } 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 Exception("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() { } }