/*
* Copyright 2012 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Eclipse Public License version 1.0, available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.jboss.forge.shell.command.convert;
import static java.lang.String.valueOf;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.mvel2.ConversionException;
import org.mvel2.ConversionHandler;
import org.mvel2.conversion.Converter;
/**
* User: christopherbrock Date: 31-Aug-2010 Time: 10:58:26 PM
*/
public class BooleanConverter implements ConversionHandler
{
private static final Map<Class<?>, Converter> CNV =
new HashMap<Class<?>, Converter>();
private static final Set<Object> TRUE = new HashSet<Object>();
private static final Set<Object> FALSE = new HashSet<Object>();
static
{
TRUE.add("true");
TRUE.add("yes");
TRUE.add("y");
TRUE.add("on");
FALSE.add("false");
FALSE.add("no");
FALSE.add("n");
FALSE.add("off");
}
private static Converter stringConverter = new Converter()
{
@Override
public Object convert(final Object o)
{
final String s = ((String) o).toLowerCase();
if (TRUE.contains(s))
{
return true;
}
else if (FALSE.contains(s))
{
return false;
}
throw new IllegalArgumentException("not a valid boolean: '" + s + "'");
}
};
@Override
public Object convertFrom(final Object in)
{
if (!CNV.containsKey(in.getClass()))
{
throw new ConversionException("cannot convert type: "
+ in.getClass().getName() + " to: " + Boolean.class.getName());
}
return CNV.get(in.getClass()).convert(in);
}
@Override
@SuppressWarnings("rawtypes")
public boolean canConvertFrom(final Class cls)
{
return CNV.containsKey(cls);
}
static
{
CNV.put(String.class,
stringConverter
);
CNV.put(Object.class,
new Converter()
{
@Override
public Object convert(final Object o)
{
return stringConverter.convert(valueOf(o));
}
}
);
CNV.put(Boolean.class,
new Converter()
{
@Override
public Object convert(final Object o)
{
return o;
}
}
);
CNV.put(Integer.class,
new Converter()
{
@Override
public Boolean convert(final Object o)
{
return (((Integer) o) > 0);
}
}
);
CNV.put(Float.class,
new Converter()
{
@Override
public Boolean convert(final Object o)
{
return (((Float) o) > 0);
}
}
);
CNV.put(Double.class,
new Converter()
{
@Override
public Boolean convert(final Object o)
{
return (((Double) o) > 0);
}
}
);
CNV.put(Short.class,
new Converter()
{
@Override
public Boolean convert(final Object o)
{
return (((Short) o) > 0);
}
}
);
CNV.put(Long.class,
new Converter()
{
@Override
public Boolean convert(final Object o)
{
return (((Long) o) > 0);
}
}
);
CNV.put(boolean.class,
new Converter()
{
@Override
public Boolean convert(final Object o)
{
return Boolean.valueOf((Boolean) o);
}
}
);
CNV.put(BigDecimal.class,
new Converter()
{
@Override
public Boolean convert(final Object o)
{
return Boolean.valueOf(((BigDecimal) o).doubleValue() > 0);
}
}
);
}
}