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/** |
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$Id$ |
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Copyright (C) 2006 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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|
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.formatter; |
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|
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import java.util.HashMap; |
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import java.util.Map; |
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|
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import net.sf.basedb.util.excel.ExcelFormatter; |
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import net.sf.basedb.util.excel.ExcelValue; |
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|
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/** |
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A generic formatter that can be used to format objects of mixed classes. |
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To use it you register a formatter for each class you expect to use. |
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A default formatter is used for objects with unregistered classes. |
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<p> |
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Null values return the empty string. |
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|
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@author nicklas |
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@version 2.0 |
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@base.modified $Date$ |
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*/ |
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public class MultiFormatter |
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implements Formatter<Object>, ExcelFormatter<Object, Object> |
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{ |
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|
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private final Formatter<Object> defaultFormatter; |
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private final boolean checkSuperclass; |
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private final Map<Class<?>, Formatter<Object>> formatters; |
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private final boolean decideOnFirst; |
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private Formatter<Object> formatter; |
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|
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/** |
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Create a new multi formatter. |
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@param defaultFormatter The formatter to use if the object's class |
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isn't found among the registered formatters |
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@param checkSuperclass If the superclass and interfaces of the object should be |
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checked in case there is no exact match |
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*/ |
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public MultiFormatter(Formatter<Object> defaultFormatter, boolean checkSuperclass) |
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{ |
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this(defaultFormatter, checkSuperclass, false); |
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} |
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|
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/** |
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Create a new multi formatter. |
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@param defaultFormatter The formatter to use if the object's class |
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isn't found among the registered formatters |
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@param checkSuperclass If the superclass and interfaces of the object should be |
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checked in case there is no exact match |
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@param decideOnFirst If TRUE, the first non-null value decides which parent |
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formatter to use. All subsequent calls to {@link #format(Object)} uses |
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the same formatetter. This is useful when you know that the formatter will |
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only use the same class of objects, but not which class. |
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@since 2.7.2 |
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*/ |
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public MultiFormatter(Formatter<Object> defaultFormatter, boolean checkSuperclass, |
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boolean decideOnFirst) |
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{ |
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this.defaultFormatter = defaultFormatter; |
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this.formatters = new HashMap<Class<?>, Formatter<Object>>(); |
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this.checkSuperclass = checkSuperclass; |
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this.decideOnFirst = decideOnFirst; |
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} |
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|
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/* |
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From the Formatter interface |
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------------------------------------------- |
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*/ |
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@Override |
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public String format(Object value) |
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{ |
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if (value == null) return ""; |
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Formatter<Object> f = getFormatter(value); |
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return f.format(value); |
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} |
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@Override |
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public Number parseString(String value) |
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{ |
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throw new UnsupportedOperationException("parseString"); |
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} |
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// ------------------------------------------- |
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|
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private Formatter<Object> getFormatter(Object value) |
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{ |
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Class<?> c = value.getClass(); |
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Formatter<Object> f = formatter; |
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if (f == null) |
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{ |
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f = formatters.get(c); |
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if (f == null && checkSuperclass) |
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{ |
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c = c.getSuperclass(); |
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Class<?>[] interfaces = c.getInterfaces(); |
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while (f == null && c != null) |
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{ |
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f = formatters.get(c); |
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c = c.getSuperclass(); |
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} |
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if (f == null) |
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{ |
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for (Class<?> iface : interfaces) |
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{ |
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f = formatters.get(iface); |
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if (f != null) break; |
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} |
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} |
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} |
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if (f == null) f = defaultFormatter; |
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if (decideOnFirst) formatter = f; |
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} |
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return f; |
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} |
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|
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/** |
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Register a formatter for the specified class. |
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@param clazz The class of objects to format with the formatter |
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@param formatter The formatter |
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*/ |
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@SuppressWarnings({ "unchecked", "rawtypes" }) |
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public <T> void registerFormatter(Class<? extends T> clazz, Formatter<T> formatter) |
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{ |
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formatters.put((Class)clazz, (Formatter)formatter); |
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} |
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|
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@SuppressWarnings({ "rawtypes", "unchecked" }) |
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@Override |
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public ExcelValue<Object> toExcelValue(Object value) |
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{ |
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if (value == null) return null; |
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Formatter<Object> f = getFormatter(value); |
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ExcelValue ev = null; |
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if (f instanceof ExcelFormatter) |
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{ |
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ExcelFormatter ef = (ExcelFormatter)f; |
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ev = ef.toExcelValue(value); |
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} |
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else |
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{ |
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ev = ExcelValue.asString(f.format(value)); |
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} |
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return ev; |
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} |
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} |