org.netxilia.api.impl.format.NumberFormatter.java Source code

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Here is the source code for org.netxilia.api.impl.format.NumberFormatter.java

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/*******************************************************************************
 * 
 * Copyright 2010 Alexandru Craciun, and individual contributors as indicated
 * by the @authors tag. 
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 * 
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 ******************************************************************************/
package org.netxilia.api.impl.format;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.util.Locale;

import org.apache.commons.lang.LocaleUtils;
import org.netxilia.api.display.StyleAttribute;
import org.netxilia.api.display.StyleDefinition;
import org.netxilia.api.value.GenericValueType;
import org.netxilia.api.value.IGenericValue;

/**
 * This class formats the numbers. A format pattern can be given.
 * 
 * @author sa
 * 
 */
public class NumberFormatter extends AbstractStyleFormatter {

    private final String pattern;
    private String locale;

    private Locale localeObject;

    private final ThreadLocal<NumberFormat> formatHolder = new ThreadLocal<NumberFormat>() {
        @Override
        protected NumberFormat initialValue() {
            return buildFormat();
        };
    };

    public NumberFormatter(StyleDefinition definition) {
        super(definition);
        this.pattern = definition.getAttribute(StyleAttribute.PATTERN);
        // Assert.notNull(this.pattern);
    }

    public GenericValueType getValueType() {
        return GenericValueType.NUMBER;
    }

    protected NumberFormat buildFormat() {
        if (localeObject == null) {
            throw new IllegalStateException("The init method was not called");
        }
        return new DecimalFormat(getPattern(), new DecimalFormatSymbols(localeObject));
    }

    private NumberFormat getFormat() {
        return formatHolder.get();
    }

    public void setLocale(String locale) {
        this.locale = locale;
    }

    public void setLocaleObject(Locale localeObject) {
        this.localeObject = localeObject;
    }

    public String getPattern() {
        return pattern;
    }

    public String getLocale() {
        return locale;
    }

    /**
     * this should be called before using the formatter!
     */
    public void init() {
        this.localeObject = locale != null ? LocaleUtils.toLocale(locale) : Locale.getDefault();
    }

    public Locale getLocaleObject() {
        return localeObject;
    }

    @Override
    public String format(IGenericValue value) {
        if (value == null) {
            return "";
        }
        Double n = value.getNumberValue();
        if (n == null) {
            return "";
        }
        return getFormat().format(n);
    }

}