PainterUtil.java 文件源码

@Override
protected Expression instantiate( Object oldInstance, Encoder out ) {
    Class type = oldInstance.getClass();
    if ( !Modifier.isPublic( type.getModifiers() ) )
        throw new IllegalArgumentException( "Could not instantiate instance of non-public class: " + oldInstance );

    for ( Field field : type.getFields() ) {
        int mod = field.getModifiers();
        if ( Modifier.isPublic( mod ) && Modifier.isStatic( mod ) && Modifier.isFinal( mod ) && ( type == field.getDeclaringClass() ) ) {
            try {
                if ( oldInstance == field.get( null ) )
                    return new Expression( oldInstance, field, "get", new Object[]{null} );
            } catch ( IllegalAccessException exception ) {
                throw new IllegalArgumentException( "Could not get value of the field: " + field, exception );
            }
        }
    }
    throw new IllegalArgumentException( "Could not instantiate value: " + oldInstance );
}