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package org.rosuda.REngine ;
/**
* Utility class to wrap an Object into a REXP object.
*
* This facilitates wrapping native java objects and arrays
* into REXP objects that can be pushed to R
*
* @author Romain Francois <francoisromain@free.fr>
*/
public class REXPWrapper {
/* various classes */
private static Class byte_ARRAY ;
private static Class short_ARRAY ;
private static Class int_ARRAY ;
private static Class long_ARRAY ;
private static Class float_ARRAY ;
private static Class double_ARRAY ;
private static Class boolean_ARRAY ;
private static Class String_ARRAY ;
private static Class Byte_ARRAY ;
private static Class Short_ARRAY;
private static Class Integer_ARRAY ;
private static Class Long_ARRAY ;
private static Class Float_ARRAY ;
private static Class Double_ARRAY ;
private static Class Boolean_ARRAY ;
static{
try{
byte_ARRAY = Class.forName("[B") ;
short_ARRAY = Class.forName("[S" );
int_ARRAY = Class.forName("[I" );
long_ARRAY = (new long[1]).getClass() ; /* FIXME */
float_ARRAY = Class.forName("[F" ) ;
double_ARRAY = Class.forName("[D" );
boolean_ARRAY = Class.forName("[Z" ) ;
String_ARRAY = Class.forName( "[Ljava.lang.String;") ;
Byte_ARRAY = Class.forName( "[Ljava.lang.Byte;" ) ;
Short_ARRAY = Class.forName( "[Ljava.lang.Short;" ) ;
Integer_ARRAY = Class.forName( "[Ljava.lang.Integer;" ) ;
Long_ARRAY = Class.forName( "[Ljava.lang.Long;" ) ;
Float_ARRAY = Class.forName( "[Ljava.lang.Float;" ) ;
Double_ARRAY = Class.forName( "[Ljava.lang.Double;" ) ;
Boolean_ARRAY = Class.forName( "[Ljava.lang.Boolean;" ) ;
} catch( Exception e){
// should never happen
e.printStackTrace();
System.err.println( "problem while initiating the classes" ) ;
}
}
/**
* Wraps an Object into a REXP
*
* <p>Conversion :</p>
*
* <ul>
* <li>Byte (byte) : REXPRaw </li>
* <li>Short (short) : REXPInteger </li>
* <li>Integer (int) : REXPInteger </li>
* <li>Long (long) : REXPInteger</li>
* <li>Float (float) : REXPDouble</li>
* <li>Double (double) : REXPDouble </li>
* <li>Boolean (boolean) : REXPLogical</li>
* <li>--</li>
* <li>String : REXPString </li>
* <li>String[] : REXPString </li>
* <li>--</li>
* <li>byte[] or Byte[] : REXPRaw</li>
* <li>short[] or Short[] : REXPInteger</li>
* <li>int[] or Integer[] : REXPInteger</li>
* <li>long[] or Long[] : REXPInteger</li>
* <li>float[] or Float[] : REXPDouble</li>
* <li>double[] or Double[] : REXPDouble </li>
* <li>boolean[] or Boolean[]: REXPLogical</li>
* <li>--</li>
* <li>null for anything else</li>
* </ul>
*
* @param o object to wrap
* @return REXP object that represents o or null if the conversion is not possible
*/
public static REXP wrap( Object o ) {
/* nothing to do in that case */
if( o instanceof REXP){
return (REXP)o;
}
Class clazz = o.getClass() ;
/* primitives */
if( clazz == Byte.class ){
byte[] load = new byte[1];
load[0] = ((Byte)o).byteValue() ;
return new REXPRaw( load );
}
if( clazz == Short.class ){
return new REXPInteger( ((Short)o).intValue() ) ;
}
if( clazz == Integer.class ){
return new REXPInteger( ((Integer)o).intValue() ) ;
}
if( clazz == Long.class ){
return new REXPInteger( ((Long)o).intValue() ) ;
}
if( clazz == Float.class ){
return new REXPDouble( ((Float)o).doubleValue() ) ;
}
if( clazz == Double.class ){
return new REXPDouble( ((Double)o).doubleValue() ) ;
}
if( clazz == Boolean.class ){
return new REXPLogical( ((Boolean)o).booleanValue() ) ;
}
/* Strings -> REXPString */
if( clazz == String.class ){
return new REXPString( (String)o ) ;
}
if( clazz == String_ARRAY ){ /* String[] */
return new REXPString( (String[])o );
}
/* array of byte or Bytes -> REXPRaw */
if( clazz == byte_ARRAY ){ /* byte[] */
return new REXPRaw( (byte[])o ) ;
}
if( clazz == Byte_ARRAY ){ /* Byte[] */
Byte[] b = (Byte[])o;
int n = b.length ;
byte[] bytes = new byte[b.length];
for( int i=0; i<n; i++){
bytes[i] = b[i].byteValue() ;
}
return new REXPRaw( bytes );
}
/* arrays of short or Short -> REXPInteger */
if( clazz == short_ARRAY ){ /* short[] */
short[] shorts = (short[])o ;
int[] ints = new int[ shorts.length ];
int n = ints.length;
for( int i=0; i<n; i++ ){
ints[i] = shorts[i];
}
return new REXPInteger( ints ) ;
}
if( clazz == Short_ARRAY ){ /* Short[] */
Short[] shorts = (Short[])o;
int n = shorts.length ;
int[] ints = new int[shorts.length];
for( int i=0; i<n; i++){
ints[i] = shorts[i].intValue() ;
}
return new REXPInteger( ints );
}
/* arrays of int or Integer -> REXPInteger */
if( clazz == int_ARRAY ){ /* int[] */
return new REXPInteger( (int[])o ) ;
}
if( clazz == Integer_ARRAY ){ /* Integer[] */
Integer[] integers = (Integer[])o;
int n = integers.length ;
int[] ints = new int[integers.length];
for( int i=0; i<n; i++){
ints[i] = integers[i].intValue() ;
}
return new REXPInteger( ints );
}
/* arrays of long or Long -> REXPInteger */
if( clazz == long_ARRAY ){ /* long[] */
long[] longs = (long[])o;
int n = longs.length ;
int[] ints = new int[longs.length];
for( int i=0; i<n; i++){
ints[i] = (int)longs[i] ;
}
return new REXPInteger( ints );
}
if( clazz == Long_ARRAY ){ /* Long[] */
Long[] longs = (Long[])o;
int n = longs.length ;
int[] ints = new int[longs.length];
for( int i=0; i<n; i++){
ints[i] = longs[i].intValue() ;
}
return new REXPInteger( ints );
}
/* float or Float arrays -> REXPDouble */
if( clazz == float_ARRAY ){ /* float[] */
float[] floats = (float[])o;
int n = floats.length ;
double[] doubles = new double[floats.length];
for( int i=0; i<n; i++){
doubles[i] = (double)floats[i] ;
}
return new REXPDouble( doubles );
}
if( clazz == Float_ARRAY ){ /* Float[] */
Float[] floats = (Float[])o;
int n = floats.length ;
double[] doubles = new double[floats.length];
for( int i=0; i<n; i++){
doubles[i] = floats[i].doubleValue() ;
}
return new REXPDouble( doubles );
}
/* double or Double arrays -> REXPDouble */
if(clazz == double_ARRAY ) { /* double[] */
return new REXPDouble( (double[])o ) ;
}
if( clazz == Double_ARRAY ){ /* Double[] */
Double[] doubles = (Double[])o;
double n = doubles.length ;
double[] d = new double[doubles.length];
for( int i=0; i<n; i++){
d[i] = doubles[i].doubleValue() ;
}
return new REXPDouble( d );
}
/* boolean arrays -> REXPLogical */
if( clazz == boolean_ARRAY ){ /* boolean[] */
return new REXPLogical( (boolean[])o ) ;
}
if( clazz == Boolean_ARRAY ){ /* Boolean[] */
Boolean[] booleans = (Boolean[])o;
int n = booleans.length ;
boolean[] b = new boolean[booleans.length];
for( int i=0; i<n; i++){
b[i] = booleans[i].booleanValue() ;
}
return new REXPLogical( b );
}
/* give up and return null */
return null ;
}
}
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