code: public void accumulate(Object workingMemoryContext,
                             Object context,
                             Tuple leftTuple,
                             InternalFactHandle handle,
                             Declaration[] declarations,
                             Declaration[] innerDeclarations,
                             WorkingMemory workingMemory) throws Exception {
          Object value = this.unwrapHandle ? ((LeftTuple) handle.getObject()).getFactHandle().getObject() : handle.getObject();
          ((CollectContext) context).result.add( value );
      }
docs: /* (non-Javadoc)
  @see org.kie.spi.Accumulator#accumulate(java.lang.Object, org.kie.spi.Tuple, org.kie.common.InternalFactHandle, org.kie.rule.Declaration[], org.kie.rule.Declaration[], org.kie.WorkingMemory)