teca_array_collection.h

#ifndef teca_array_collection_h
#define teca_array_collection_h
 
#include "teca_config.h"
#include "teca_dataset.h"
#include "teca_shared_object.h"
#include "teca_variant_array.h"
#include <map>
#include <vector>
#include <string>
 
TECA_SHARED_OBJECT_FORWARD_DECL(teca_array_collection)
 
/// A collection of named arrays.
/**
 * The array collection is used internally in other mesh based datasets. It
 * can also be used to process more general data where the arrays have
 * differing lengths or a non-geometric association.
 */
class TECA_EXPORT teca_array_collection : public teca_dataset
{
public:
    TECA_DATASET_STATIC_NEW(teca_array_collection)
    TECA_DATASET_NEW_INSTANCE()
    TECA_DATASET_NEW_COPY()
 
    // set/get temporal metadata
    TECA_DATASET_METADATA(time, double, 1)
    TECA_DATASET_METADATA(calendar, std::string, 1)
    TECA_DATASET_METADATA(time_units, std::string, 1)
    TECA_DATASET_METADATA(time_step, unsigned long, 1)
 
    // set/get attribute metadata
    TECA_DATASET_METADATA(attributes, teca_metadata, 1)
 
    /// reset to empty state
    void clear();
 
    /** declare a set of arrays. requires name,type pairs for ex.
     * define("c1",int(),"c2",float()) creates 2 arrays in the collection the
     * first storing int the second storing float.
     */
    template<typename nT, typename aT, typename... oT>
    void declare_set(nT &&a_name, aT a_type, oT &&...args);
 
    /// declare a single array
    template<typename nT, typename aT>
    void declare(nT &&a_name, aT a_type);
 
    /// set the allocator to use with ::declare
    void set_default_allocator(allocator alloc)
    { this->default_allocator = alloc; }
 
    /** add, return the index of the new entry,  or -1 if the array name already
     * exists.
     */
    int append(p_teca_variant_array array);
 
    /** add, return the index of the new entry,  or -1 if the array name already
     * exists.
     */
    int append(const std::string &name, p_teca_variant_array array);
 
    /** replace the ith array, return 0 on success.  the name of the array is
     * not changed.
     */
    int set(unsigned int i, p_teca_variant_array array);
 
    /// add or replace the named array, returns 0 on success.
    int set(const std::string &name, p_teca_variant_array array);
 
    /// remove the ith array
    int remove(unsigned int i);
 
    /// remove the named array
    int remove(const std::string &name);
 
    /// Return the number of arrays
    unsigned int size() const noexcept
    { return m_arrays.size(); }
 
    /// access an array by its by id
    p_teca_variant_array get(unsigned int i)
    { return m_arrays[i]; }
 
    /// access an array by its by id
    const_p_teca_variant_array get(unsigned int i) const
    { return m_arrays[i]; }
 
    /// test for array
    bool has(const std::string &name) const;
 
    /// access an array by name
    p_teca_variant_array get(const std::string &name);
 
    /// access an array by name
    const_p_teca_variant_array get(const std::string &name) const;
 
    /// access an array by name
    p_teca_variant_array operator[](const std::string &name)
    { return this->get(name); }
 
    /// access an array by name
    const_p_teca_variant_array operator[](const std::string &name) const
    { return this->get(name); }
 
    // Get the name of the ith array
    std::string &get_name(unsigned int i)
    { return m_names[i]; }
 
    // Get the name of the ith array
    const std::string &get_name(unsigned int i) const
    { return m_names[i]; }
 
    // Get the list of names
    std::vector<std::string> &get_names()
    { return m_names; }
 
    // Get the list of names
    const std::vector<std::string> &get_names() const
    { return m_names; }
 
    /// Return the name of the class
    std::string get_class_name() const override
    { return "teca_array_collection"; }
 
    /// return an integer identifier uniquely naming the dataset type
    int get_type_code() const override;
 
    /// @copydoc teca_dataset::copy(const const_p_teca_dataset &,allocator)
    void copy(const const_p_teca_dataset &other,
        allocator alloc = allocator::malloc) override;
 
    /// @copydoc teca_dataset::shallow_copy(const p_teca_dataset &)
    void shallow_copy(const p_teca_dataset &other) override;
 
    /// append
    int append(const const_p_teca_array_collection &other);
 
    /// shallow append
    int shallow_append(const p_teca_array_collection &other);
 
    /// swap
    void swap(const p_teca_dataset &other) override;
 
    /// serialize the data to the given stream for I/O or communication
    int to_stream(teca_binary_stream &s) const override;
 
    /// serialize the data from the given stream for I/O or communication
    int from_stream(teca_binary_stream &s) override;
 
    /// stream to a human readable representation
    int to_stream(std::ostream &) const override;
    using teca_dataset::from_stream;
 
#if defined(SWIG)
protected:
#else
public:
#endif
    // NOTE: constructors are public to enable std::make_shared. do not use.
    teca_array_collection() = default;
 
protected:
    teca_array_collection(const teca_array_collection &) = delete;
    teca_array_collection(const teca_array_collection &&) = delete;
    void operator=(const teca_array_collection &) = delete;
    void operator=(const teca_array_collection &&) = delete;
    void declare_set(){}
 
private:
    using name_vector_t = std::vector<std::string>;
    using array_vector_t = std::vector<p_teca_variant_array>;
    using name_array_map_t = std::map<std::string,unsigned int>;
 
    name_vector_t m_names;
    array_vector_t m_arrays;
    name_array_map_t m_name_array_map;
    allocator default_allocator;
};
 
// --------------------------------------------------------------------------
template<typename nT, typename aT, typename... oT>
void teca_array_collection::declare_set(nT &&a_name, aT a_type, oT &&... args)
{
    this->declare(std::forward<nT>(a_name), a_type);
    this->declare_set(args...);
}
 
// --------------------------------------------------------------------------
template<typename nT, typename aT>
void teca_array_collection::declare(nT &&a_name, aT)
{
    unsigned int id = m_arrays.size();
    m_names.emplace_back(std::forward<nT>(a_name));
    m_arrays.emplace_back(teca_variant_array_impl<aT>::New(this->default_allocator));
    m_name_array_map.emplace(std::forward<nT>(a_name), id);
}
 
#endif