ConverterRegistry.java example

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/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 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.
 *
 * Copyright (c) 2001 - 2016 Object Refinery Ltd, Pentaho Corporation and Contributors..  All rights reserved.
 */

package org.pentaho.reporting.engine.classic.core.util.beans;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.TimeZone;

import org.pentaho.reporting.engine.classic.core.ElementAlignment;
import org.pentaho.reporting.engine.classic.core.imagemap.ImageMap;
import org.pentaho.reporting.engine.classic.core.style.BorderStyle;
import org.pentaho.reporting.engine.classic.core.style.BoxSizing;
import org.pentaho.reporting.engine.classic.core.style.FontSmooth;
import org.pentaho.reporting.engine.classic.core.style.TextDirection;
import org.pentaho.reporting.engine.classic.core.style.TextRotation;
import org.pentaho.reporting.engine.classic.core.style.TextWrap;
import org.pentaho.reporting.engine.classic.core.style.VerticalTextAlign;
import org.pentaho.reporting.engine.classic.core.style.WhitespaceCollapse;
import org.pentaho.reporting.engine.classic.core.util.StagingMode;

public final class ConverterRegistry {
  private static ConverterRegistry instance;
  private HashMap<Class, ValueConverter> registeredClasses;

  public static synchronized ConverterRegistry getInstance() {
    if ( instance == null ) {
      instance = new ConverterRegistry();
    }
    return instance;
  }

  private ConverterRegistry() {
    registeredClasses = new HashMap<Class, ValueConverter>();
    registeredClasses.put( BigDecimal.class, new BigDecimalValueConverter() );
    registeredClasses.put( BigInteger.class, new BigIntegerValueConverter() );
    registeredClasses.put( Boolean.class, new BooleanValueConverter() );
    registeredClasses.put( Boolean.TYPE, new BooleanValueConverter() );
    registeredClasses.put( Byte.class, new ByteValueConverter() );
    registeredClasses.put( Byte.TYPE, new ByteValueConverter() );
    registeredClasses.put( Character.class, new CharacterValueConverter() );
    registeredClasses.put( Character.TYPE, new CharacterValueConverter() );
    registeredClasses.put( Color.class, new ColorValueConverter() );
    registeredClasses.put( Double.class, new DoubleValueConverter() );
    registeredClasses.put( Double.TYPE, new DoubleValueConverter() );
    registeredClasses.put( Float.class, new FloatValueConverter() );
    registeredClasses.put( Float.TYPE, new FloatValueConverter() );
    registeredClasses.put( Integer.class, new IntegerValueConverter() );
    registeredClasses.put( Integer.TYPE, new IntegerValueConverter() );
    registeredClasses.put( ImageMap.class, new ImageMapValueConverter() );
    registeredClasses.put( Long.class, new LongValueConverter() );
    registeredClasses.put( Long.TYPE, new LongValueConverter() );
    registeredClasses.put( Short.class, new ShortValueConverter() );
    registeredClasses.put( Short.TYPE, new ShortValueConverter() );
    registeredClasses.put( String.class, new StringValueConverter() );
    registeredClasses.put( Number.class, new BigDecimalValueConverter() );
    registeredClasses.put( Class.class, new ClassValueConverter() );
    registeredClasses.put( Locale.class, new LocaleValueConverter() );
    registeredClasses.put( TimeZone.class, new TimeZoneValueConverter() );
    registeredClasses.put( Date.class, new DateValueConverter() );
    registeredClasses.put( Font.class, new FontValueConverter() );
    registeredClasses.put( ElementAlignment.class, new ElementAlignmentValueConverter() );
    registeredClasses.put( WhitespaceCollapse.class, new WhitespaceCollapseValueConverter() );
    registeredClasses.put( VerticalTextAlign.class, new VerticalTextAlignValueConverter() );
    registeredClasses.put( BoxSizing.class, new BoxSizingValueConverter() );
    registeredClasses.put( BorderStyle.class, new BorderStyleValueConverter() );
    registeredClasses.put( FontSmooth.class, new FontSmoothValueConverter() );
    registeredClasses.put( TextWrap.class, new TextWrapValueConverter() );
    registeredClasses.put( TextDirection.class, new TextDirectionValueConverter() );
    registeredClasses.put( java.sql.Date.class, new SQLDateValueConverter() );
    registeredClasses.put( Time.class, new SQLTimeValueConverter() );
    registeredClasses.put( Timestamp.class, new SQLTimestampValueConverter() );
    registeredClasses.put( StagingMode.class, new StagingModeValueConverter() );
    registeredClasses.put( BasicStroke.class, new BasicStrokeValueConverter() );
    registeredClasses.put( TextRotation.class, new TextRotationValueConverter() );
  }

  public ValueConverter getValueConverter( final Class c ) {
    final ValueConverter plain = registeredClasses.get( c );
    if ( plain != null ) {
      return plain;
    }
    if ( c.isArray() ) {
      final Class componentType = c.getComponentType();
      final ValueConverter componentConverter = getValueConverter( componentType );
      if ( componentConverter != null ) {
        return new ArrayValueConverter( componentType, componentConverter );
      }
    }
    if ( c.isEnum() ) {
      return new EnumValueConverter( c );
    }
    return null;
  }

  /**
   * Converts an object to an attribute value.
   *
   * @param o
   *          the object.
   * @return the attribute value.
   * @throws BeanException
   *           if there was an error during the conversion.
   */
  public static String toAttributeValue( final Object o ) throws BeanException {
    if ( o == null ) {
      return null;
    }
    final ValueConverter vc = ConverterRegistry.getInstance().getValueConverter( o.getClass() );
    if ( vc == null ) {
      return null;
    }
    return vc.toAttributeValue( o );
  }

  /**
   * Converts a string to a property value.
   *
   * @param s
   *          the string.
   * @param c
   *          the target class.
   * @return the object converted from the given string into a object of the target class.
   * @throws BeanException
   *           if there was an error during the conversion.
   */
  public static Object toPropertyValue( final String s, final Class c ) throws BeanException {
    if ( s == null ) {
      return null;
    }
    if ( c == null ) {
      return null;
    }
    final ValueConverter vc = ConverterRegistry.getInstance().getValueConverter( c );
    if ( vc == null ) {
      return null;
    }
    return vc.toPropertyValue( s );
  }

  public static Object convert( final Object o, final Class c, final Object defaultValue ) {
    if ( o == null ) {
      return defaultValue;
    }
    if ( c.isInstance( o ) ) {
      return o;
    }
    try {
      final String s = String.valueOf( o );
      return toPropertyValue( s, c );
    } catch ( BeanException e ) {
      return defaultValue;
    }
  }
}