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com.draagon.meta.util.DataConverter Maven / Gradle / Ivy
MetaObjects for Model-driven development - MetaData Libraries
package com.draagon.meta.util;
import com.draagon.meta.DataTypes;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
/**
* Util class to convert from one data type to another
*
* @author Douglas Mealing
*/
public final class DataConverter
{
private static Log log = LogFactory.getLog( DataConverter.class );
/** Private constructor */
private DataConverter() {}
/** Converts the object to the specified MetaFieldType */
public static Object toType( DataTypes dataType, Object val ) {
if ( val == null ) return null;
switch( dataType ) {
case BOOLEAN: return toBoolean( val );
case BYTE: return toByte( val );
case SHORT: return toShort( val );
case INT: return toInt( val );
case LONG: return toLong( val );
case FLOAT: return toFloat( val );
case DOUBLE: return toDouble( val );
case STRING: return toString( val );
case DATE: return toDate( val );
case OBJECT: return toObject( val );
case BOOLEAN_ARRAY: //return toBooleanArray( val );
case BYTE_ARRAY://return toByteArray( val );
case SHORT_ARRAY: //return toShortArray( val );
case INT_ARRAY: //return toIntArray( val );
case LONG_ARRAY: //return toLongArray( val );
case FLOAT_ARRAY: //return toFloatArray( val );
case DOUBLE_ARRAY: //return toDoubleArray( val );
case DATE_ARRAY: //toDateArray( val );
return unsupported(dataType,val);
case STRING_ARRAY: return toStringArray( val );
case OBJECT_ARRAY: return toObjectArray( val );
case CUSTOM: throw new IllegalStateException( "Cannot convert to a custom type, value passed: [" + val + "]" );
default: throw new IllegalStateException( "Unknown type (" + dataType + "), cannot convert object [" + val + "]" );
}
}
/** Convert to an Object, if a list returns null if empty, or object if length of 1, otherwise an exception */
public static List toStringArray( Object val ) {
if ( val == null ) {
return null;
}
else if (val instanceof List) {
// TODO: Fix this to map to an actual object array
return (List) val;
}
else if ( val instanceof String ) {
List list = new ArrayList<>();
if ( !((String) val).isEmpty()) {
String s= (String) val;
if (s.contains(",")) {
Collections.addAll(list, ((String) val).split(","));
} else {
list.add( s );
}
}
return list;
}
else {
List l = new ArrayList();
l.add( toString( val ));
return l;
}
}
/** Convert to an Object, if a list returns null if empty, or object if length of 1, otherwise an exception */
public static List toObjectArray( Object val ) {
if ( val == null ) {
return null;
}
else if (val instanceof List) {
// TODO: Fix this to map to an actual object array
return (List) val;
}
else {
List l = new ArrayList();
l.add( val );
return l;
}
}
protected static Object unsupported( DataTypes dataType, Object val ) {
if ( val == null ) return null;
throw new UnsupportedOperationException( "Cannot currently support converting an Object ["+val+"] to type ("+dataType+")" );
}
/** Convert to an Object, if a list returns null if empty, or object if length of 1, otherwise an exception */
public static Object toObject( Object val ) {
if (val instanceof List) {
List l = (List) val;
if ( l.size() == 0 ) return null;
else if ( l.size() == 1 ) return l.get(0);
else throw new IllegalStateException( "Cannot convert List to to Object as it contains more than 1 value" );
}
else {
return val;
}
}
/**
* Converts the object value to double value
*
* @param val Value
* @return Double value
*/
public static Boolean toBoolean( Object val )
{
if ( val == null ) return null;
if ( val instanceof String && ((String) val).isEmpty()) return null;
if ( val instanceof Boolean ) {
return (Boolean) val;
}
else if ( val instanceof Byte ) {
return (Byte) val != 0;
}
else if ( val instanceof Short ) {
return (Short) val != 0;
}
else if ( val instanceof Integer ) {
return (Integer) val != 0;
}
else if ( val instanceof Long ) {
return (Long) val != 0;
}
else if ( val instanceof Float ) {
return (Float) val != 0;
}
else if ( val instanceof Double ) {
return (Double) val != 0;
}
else if ( val instanceof Date ) {
return ((Date) val).getTime() != 0;
}
else {
return val.toString().length() > 0 && (val.toString().charAt(0) == 't'
|| val.toString().charAt(0) == 'T');
}
} // toDouble
/**
* Converts the object value to double value
*
* @param val Value
* @return Double value
*/
public static Double toDouble( Object val )
{
if ( val == null ) return null;
if ( val instanceof String && ((String) val).isEmpty()) return null;
if ( val instanceof Boolean ) {
if ((Boolean) val) return 1.0;
}
else if ( val instanceof Byte ) {
return (double) val;
}
else if ( val instanceof Short ) {
return (double) val;
}
else if ( val instanceof Integer ) {
return (double) val;
}
else if ( val instanceof Long ) {
return (double) val;
}
else if ( val instanceof Float ) {
return (double) val;
}
else if ( val instanceof Double ) {
return (Double) val;
}
else if ( val instanceof String ) {
try { return Double.parseDouble((String) val); } catch( Exception ignored) {}
}
else if ( val instanceof Date ) {
return (double) ((Date) val).getTime();
}
else {
try { return Double.parseDouble(val.toString()); } catch( Exception ignored) {}
}
return 0.0;
} // toDouble
/**
* Converts the object value to Float value
*
* @param val Value
* @return Float value
*/
public static Float toFloat( Object val )
{
if ( val == null ) {
return null;
}
else if ( val instanceof String ) {
if (((String) val).isEmpty()) return null;
else return Float.parseFloat((String) val);
}
else if ( val instanceof Boolean ) {
if ((Boolean) val) return 1f;
}
else if ( val instanceof Byte ) {
return (float) (Byte) val;
}
else if ( val instanceof Short ) {
return (float) (Short) val;
}
else if ( val instanceof Integer ) {
return (float) (Integer) val;
}
else if ( val instanceof Long ) {
return (float) (Long) val;
}
else if ( val instanceof Float ) {
return (float) val;
}
else if ( val instanceof Double ) {
return (float) (double) val; // downScaleCheck( "double", "float", (double) val, (double) Float.MIN_VALUE+1f, (double) Float.MAX_VALUE-1f );
}
else if ( val instanceof Date ) {
return (float) ((Date) val).getTime();
}
else {
return Float.parseFloat(val.toString());
}
return (float) 0;
} // toFloat
/**
* Converts the object value to Long value
*
* @param val Value
* @return Long value
*/
public static Long toLong( Object val )
{
if ( val == null ) {
return null;
}
else if ( val instanceof String ) {
if (((String) val).isEmpty()) return null;
else return Long.parseLong((String) val);
}
else if ( val instanceof Boolean ) {
if ((Boolean) val) return 1L;
}
else if ( val instanceof Byte ) {
return (long) (Byte) val;
}
else if ( val instanceof Short ) {
return (long) (Short) val;
}
else if ( val instanceof Integer ) {
return (long) (Integer) val;
}
else if ( val instanceof Long ) {
return (long) val;
}
else if ( val instanceof Float ) {
return (long) (float) val;
}
else if ( val instanceof Double ) {
return (long) downScaleCheck( "double", "long", (double) val, (double) Long.MIN_VALUE, (double) Long.MAX_VALUE );
}
else if ( val instanceof Date ) {
return ((Date) val).getTime();
}
else {
return Long.parseLong(val.toString());
}
return 0L;
} // toLong
/**
* Converts the object value to Integer value
*
* @param val Value
* @return Integer Value
*/
public static Integer toInt( Object val )
{
if ( val == null ) {
return null;
}
else if ( val instanceof Integer ) {
return (int) val;
}
else if ( val instanceof String ) {
if (((String) val).isEmpty()) return null;
else return Integer.parseInt((String)val);
}
else if ( val instanceof Boolean ) {
if ((Boolean) val) return 1;
}
else if ( val instanceof Byte ) {
return (int) (byte) val;
}
else if ( val instanceof Short ) {
return (int) (short) val;
}
else if ( val instanceof Long ) {
return (int) downScaleCheck( "long", "int", (long) val, (long) Integer.MIN_VALUE, (long) Integer.MAX_VALUE );
}
else if ( val instanceof Float ) {
return (int) downScaleCheck( "float", "int", (double) (float) val, (double) Integer.MIN_VALUE, (double) Integer.MAX_VALUE );
}
else if ( val instanceof Double ) {
return (int) downScaleCheck( "double", "int", (double) val, (double) Integer.MIN_VALUE, (double) Integer.MAX_VALUE );
}
else if ( val instanceof Date ) {
return (int) downScaleCheck( "Date", "int", ((Date) val).getTime(), (long) Integer.MIN_VALUE, (long) Integer.MAX_VALUE );
}
else {
return Integer.parseInt(val.toString());
}
return 0;
} // toInt
/**
* Convert the object value to short value
*
* @param val Value
* @return Short value
*/
public static Short toShort( Object val )
{
if ( val == null ) {
return null;
}
else if ( val instanceof String ) {
if (((String) val).isEmpty()) return null;
else return Short.parseShort((String) val);
}
else if ( val instanceof Boolean ) {
if ((Boolean) val) return (short) 1;
}
else if ( val instanceof Byte ) {
return (short) (byte) val;
}
else if ( val instanceof Short ) {
return (short) val;
}
else if ( val instanceof Integer ) {
return (short) downScaleCheck( "int", "short", (long) (int) val, (long) Short.MIN_VALUE, (long) Short.MAX_VALUE );
}
else if ( val instanceof Long ) {
return (short) downScaleCheck( "long", "short", (long) val, (long) Short.MIN_VALUE, (long) Short.MAX_VALUE );
}
else if ( val instanceof Float ) {
return (short) downScaleCheck( "float", "short", (double) (float) val, (double) Short.MIN_VALUE, (double) Short.MAX_VALUE );
}
else if ( val instanceof Double ) {
return (short) downScaleCheck( "double", "short", (double) val, (double) Short.MIN_VALUE, (double) Short.MAX_VALUE );
}
else if ( val instanceof Date ) {
return (short) downScaleCheck( "Date", "short", (long) ((Date) val).getTime(), (long) Short.MIN_VALUE, (long) Short.MAX_VALUE );
}
else {
return Short.parseShort(val.toString());
}
return (short) 0;
} // toShort
/**
* Convert the object value to byte value
*
* @param val Value
* @return Short value
*/
public static Byte toByte( Object val )
{
if ( val == null ) {
return null;
}
else if ( val instanceof Byte ) {
return (Byte) val;
}
else if ( val instanceof String ) {
if (((String) val).isEmpty()) return null;
return Byte.parseByte((String) val);
}
else if ( val instanceof Boolean ) {
if ((Boolean) val) return (byte) 1;
}
else if ( val instanceof Short ) {
return (byte) downScaleCheck( "short", "byte", (long) (short) val, (long) Byte.MIN_VALUE, (long) Byte.MAX_VALUE );
}
else if ( val instanceof Integer ) {
return (byte) downScaleCheck( "int", "byte", (long) (int) val, (long) Byte.MIN_VALUE, (long) Byte.MAX_VALUE );
}
else if ( val instanceof Long ) {
return (byte) downScaleCheck( "long", "byte", (long) val, (long) Byte.MIN_VALUE, (long) Byte.MAX_VALUE );
}
else if ( val instanceof Float ) {
return (byte) downScaleCheck( "float", "byte", (double) (float) val, (double) Byte.MIN_VALUE, (double) Byte.MAX_VALUE );
}
else if ( val instanceof Double ) {
return (byte) downScaleCheck( "double", "byte", (double) val, (double) Byte.MIN_VALUE, (double) Byte.MAX_VALUE );
}
else if ( val instanceof Date ) {
return (byte) downScaleCheck( "Date", "byte", ((Date) val).getTime(), (long) Byte.MIN_VALUE, (long) Byte.MAX_VALUE );
}
else {
return Byte.parseByte(val.toString());
}
return (byte) 0;
} // toByte
/**
* Convert the object value to byte value
*
* @param val Value
* @return Short value
*/
public static String toString( Object val )
{
if ( val == null ) {
return null;
} else if ( val instanceof List ) {
return String.join(",", (List) val );
} else if ( val instanceof Date ) {
return String.valueOf(((Date) val ).getTime());
} else if ( val instanceof Class ) {
return String.valueOf(((Class) val ).getName());
} else {
return val.toString();
}
} // toString
/**
* Convert the object value to Date value
*
* @param val Value
* @return Short value
*/
public static Date toDate( Object val )
{
if ( val == null ) {
return null;
}
else if ( val instanceof Date ) {
return (Date) val;
}
else if ( val instanceof String ) {
if (((String)val).isEmpty()) return null;
else return new Date(Long.parseLong((String) val));
}
else if ( val instanceof Boolean ) {
if ((Boolean) val) return new Date();
else return new Date( 0 );
}
else if ( val instanceof Byte ) {
return new Date( (long) (Byte) val);
}
else if ( val instanceof Short ) {
return new Date( (long) (Short) val);
}
else if ( val instanceof Integer ) {
return new Date( (long) (Integer) val);
}
else if ( val instanceof Long ) {
return new Date( (long) val);
}
else if ( val instanceof Float ) {
return new Date( (long) ((Float) val ).floatValue() );
}
else if ( val instanceof Double ) {
return new Date( (long) downScaleCheck( "double", "long", (double) val, (double) Long.MIN_VALUE, (double) Long.MAX_VALUE ));
}
// Catch anything else
return new Date( Long.parseLong( val.toString() ));
} // toDate
/** Check down scaling for decimals */
private static double downScaleCheck( String from, String to, double val, double min, double max ) {
if ( val > max || val < min) {
throw new NumberFormatException( "Cannot convert "+from+" to "+to+" as it exceeds the max or min value: " + val );
}
return val;
}
/** Check down scaling for numbers */
private static long downScaleCheck( String from, String to, long val, long min, long max ) {
if ( val > max || val < min) {
throw new NumberFormatException( "Cannot convert "+from+" to "+to+" as it exceeds the max or min value: " + val );
}
return val;
}
} // Converter
