Blame DMR.cc

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// -*- mode: c++; c-basic-offset:4 -*-
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// This file is part of libdap, A C++ implementation of the OPeNDAP Data
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// Access Protocol.
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// Copyright (c) 2013 OPeNDAP, Inc.
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// Author: James Gallagher <jgallagher@opendap.org>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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//
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// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
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#include "config.h"
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#ifdef WIN32
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#include <io.h>
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#include <process.h>
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#include <fstream>
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#else
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#include <unistd.h>    // for alarm and dup
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#include <sys/wait.h>
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#endif
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#include <cassert>
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#include <iostream>
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#include <sstream>
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//#define DODS_DEBUG
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//#define DODS_DEBUG2
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#include "D4Group.h"
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#include "BaseType.h"
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#include "Array.h"
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#include "Grid.h"
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#include "DMR.h"
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#include "XMLWriter.h"
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#include "D4BaseTypeFactory.h"
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#include "D4Attributes.h"
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#include "DDS.h"	// Included so DMRs can be built using a DDS for 'legacy' handlers
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#include "debug.h"
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/**
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 * DapXmlNamespaces
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 *
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 * TODO  Replace all uses of the following variables with calls to DapXmlNamespaces
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 */
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const string c_xml_xsi = "http://www.w3.org/2001/XMLSchema-instance";
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const string c_xml_namespace = "http://www.w3.org/XML/1998/namespace";
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const string c_default_dap40_schema_location = "http://xml.opendap.org/dap/dap4.0.xsd";
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const string c_dap40_namespace = "http://xml.opendap.org/ns/DAP/4.0#";
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const string c_dap_40_n_sl = c_dap40_namespace + " " + c_default_dap40_schema_location;
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using namespace std;
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namespace libdap {
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void
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DMR::m_duplicate(const DMR &dmr)
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{
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    // This is needed because we use the factory to make a new instance of the root group
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    assert(dmr.OK());
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    d_factory = dmr.d_factory; // Shallow copy here
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    d_name = dmr.d_name;
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    d_filename = dmr.d_filename;
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    d_dap_major = dmr.d_dap_major;
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    d_dap_minor = dmr.d_dap_minor;
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    d_dap_version = dmr.d_dap_version;       // String version of the protocol
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    d_dmr_version = dmr.d_dmr_version;
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    d_request_xml_base = dmr.d_request_xml_base;
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    d_namespace = dmr.d_namespace;
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    d_max_response_size = dmr.d_max_response_size;
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    // Deep copy, using ptr_duplicate()
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    // d_root can only be a D4Group, so the thing returned by ptr_duplicate() must be a D4Group.
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    d_root = static_cast<D4Group*>(dmr.d_root->ptr_duplicate());
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    DBG(cerr << "dmr.d_root: " << dmr.d_root << endl);
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    DBG(cerr << "d_root (from ptr_dup(): " << d_root << endl);
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    //d_root = static_cast<D4Group*>(dmr.d_factory->NewVariable(dods_group_c, dmr.d_root->name()));
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}
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/**
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 * Make a DMR which uses the given BaseTypeFactory to create variables.
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 *
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 * @note The default DAP version is 4.0 - use the DDS class to make DAP2
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 * things. The default DMR version is 1.0
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 *
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 * @param factory The D4BaseTypeFactory to use when creating instances of
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 * DAP4 variables. The caller must ensure the factory's lifetime is at least
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 * that of the DMR instance.
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 * @param name The name of the DMR - usually derived from the name of the
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 * pathname or table name of the dataset.
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 */
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DMR::DMR(D4BaseTypeFactory *factory, const string &name)
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        : d_factory(factory), d_name(name), d_filename(""),
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          d_dap_major(4), d_dap_minor(0),
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          d_dmr_version("1.0"), d_request_xml_base(""),
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          d_namespace(c_dap40_namespace), d_max_response_size(0), d_root(0)
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{
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    // sets d_dap_version string and the two integer fields too
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    set_dap_version("4.0");
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}
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/** @brief Build a DMR using a DAP2 DDS.
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 *
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 * Given a DDS from code written for DAP2, build a DAP4 DMR object. This
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 * works because DAP4 subsumes DAP2, but there are a few quirks... For
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 * each variable in the DDS, transform it to the equivalent DAP4 variable
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 * type and then copy the variable's attributes. Most types convert easily.
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 * Types that need special treatment are:
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 * Array: DAP2 array dimensions must be morphed to DAP4
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 * Sequence: Make a D4Sequence
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 * Grid: Make a coverage; assume Grids with the same dimension names
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 * have 'shared dimensions' and that maps with the same names are shared too.
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 *
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 * @note Assume that a DDS has only a root group. This is not actually
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 * true for a DDS from the HDF5 handler, because it has Groups encoded
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 * into the variable names. jhrg 3/18/14
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 *
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 * @param factory Factory class used to make new variables
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 * @param dds Get the variables to convert from this DAP2 DDS.
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 * @see BaseType::transform_to_dap4()
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 */
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DMR::DMR(D4BaseTypeFactory *factory, DDS &dds)
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        : d_factory(factory), d_name(dds.get_dataset_name()),
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          d_filename(dds.filename()), d_dap_major(4), d_dap_minor(0),
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          d_dmr_version("1.0"), d_request_xml_base(""),
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          d_namespace(c_dap40_namespace), d_max_response_size(0), d_root(0)
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{
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    // sets d_dap_version string and the two integer fields too
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    set_dap_version("4.0");
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    build_using_dds(dds);
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#if 0
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    for (DDS::Vars_iter i = dds.var_begin(), e = dds.var_end(); i != e; ++i) {
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    	BaseType *new_var = (*i)->transform_to_dap4(root() /*group*/, root() /*container*/);
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    	// If the variable being transformed is a Grid,
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    	// then Grid::transform_to_dap4() will add all the arrays to the
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    	// container (root() in this case) and return null, indicating that
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    	// this code does not need to do anything to add the transformed variable.
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    	if (new_var)
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    		root()->add_var_nocopy(new_var);
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    }
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    // Now copy the global attributes
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    root()->attributes()->transform_to_dap4(dds.get_attr_table());
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#endif
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}
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/**
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 * Make a DMR which uses the given BaseTypeFactory to create variables.
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 *
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 * @note The default DAP version is 4.0 - use the DDS class to make DAP2
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 * things. The default DMR version is 1.0
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 */
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DMR::DMR()
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        : d_factory(0), d_name(""), d_filename(""), d_dap_major(4), d_dap_minor(0),
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          d_dap_version("4.0"), d_dmr_version("1.0"), d_request_xml_base(""),
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          d_namespace(c_dap40_namespace), d_max_response_size(0), d_root(0)
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{
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    // sets d_dap_version string and the two integer fields too
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    set_dap_version("4.0");
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}
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/** The DMR copy constructor. */
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DMR::DMR(const DMR &rhs) : DapObj()
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{
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    m_duplicate(rhs);
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}
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/** Delete a DMR. The BaseType factory is not freed, while the contained
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 * group is.
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 */
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DMR::~DMR()
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{
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#if 1
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    delete d_root;
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#endif
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}
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DMR &
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DMR::operator=(const DMR &rhs)
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{
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    if (this == &rhs)
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        return *this;
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    m_duplicate(rhs);
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    return *this;
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}
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/**
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 * If we have a DDS that includes Attributes, use it to build the DMR. This
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 * will copy all of the variables in the DDS into the DMR using BaseType::transform_to_dap4(),
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 * so the actual types added can be controlled by code that specializes
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 * the various type classes.
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 *
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 * @param dds Read variables and Attributes from this DDS
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 */
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void DMR::build_using_dds(DDS &dds)
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{
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    set_name(dds.get_dataset_name());
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    set_filename(dds.filename());
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    D4Group *root_grp = root();
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    for (DDS::Vars_iter i = dds.var_begin(), e = dds.var_end(); i != e; ++i) {
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        BaseType *d4_var = root()->var((*i)->name());
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        // Don't add duplicate variables. We have to make this check
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        // because some of the child variables may add arrays
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        // to the root object. For example, this happens in
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        // Grid with the Map Arrays - ndp - 05/08/17
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        if(!d4_var){
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            // no variable of this name is in the root group at this point. Add it.
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            DBG(cerr << __func__ << "() - Transforming top level variable: " <<
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                " (" << (*i)->type_name() << ":'" << (*i)->name() << "':"<<(void *)(*i) <<
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                ") (root:"<< root_grp << ")"<< endl; );
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            (*i)->transform_to_dap4(root_grp, root_grp);
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            DBG(cerr << __func__ << "() - top level variable: '" <<
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                (*i)->name() << "' (type:" << (*i)->type_name() << ") Transformed"<< endl; );
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        }
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        else {
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            DBG(cerr << __func__ << "() - Skipping variable: " <<
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                d4_var->type_name() << " " << d4_var->name() << " because a variable with" <<
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                " this name already exists in the root group." << endl; );
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        }
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    }
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    // Now copy the global attributes
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    root()->attributes()->transform_to_dap4(dds.get_attr_table());
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}
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#if 1
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/**
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 * If we have a DMR that includes Attributes, use it to build the DDS. This
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 * will copy all of the variables in the DMR into the DDS using
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 * BaseType::transform_to_dap2(), so the actual types added can be
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 * controlled by code that specializes the various type classes.
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 *
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 * @param dds Read variables and Attributes from this DDS
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 */
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DDS *DMR::getDDS(DMR &dmr)
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{
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    DBG( cerr << __func__ << "() - BEGIN" << endl;);
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    D4Group *root = dmr.root();
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    BaseTypeFactory *btf = new BaseTypeFactory();
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    DDS *dds = new DDS(btf,dmr.name());
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    dds->filename(dmr.filename());
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    AttrTable *dds_at = &(dds->get_attr_table());
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    // Now copy the global attributes
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    // D4Attributes::load_AttrTable(dds_at,root->attributes());
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    vector<BaseType *> *top_vars = root->transform_to_dap2(dds_at,true);
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    vector<BaseType *>::iterator vIter = top_vars->begin();
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    vector<BaseType *>::iterator vEnd = top_vars->end();
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    for( ; vIter!=vEnd ; vIter++){
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        dds->add_var(*vIter);
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    }
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#if 0
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    set<string> shared_dim_candidates;
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    vector<BaseType *> dropped_vars;
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    for (D4Group::Vars_iter i = root->var_begin(), e = root->var_end(); i != e; ++i)
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    {
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        DBG( cerr << __func__ << "() - Processing top level variable '"<< (*i)->type_name() << " " <<  (*i)->name() << "' to DDS." << endl; );
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        vector<BaseType *> *new_vars = (*i)->transform_to_dap2(&(dds->get_attr_table()));
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        if(new_vars!=0){
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            vector<BaseType*>::iterator vIter = new_vars->begin();
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            vector<BaseType*>::iterator end = new_vars->end();
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            for( ; vIter!=end ; vIter++ ){
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                BaseType *new_var = (*vIter);
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                DBG( cerr << __func__ << "() - Adding variable name: '"<< new_var->name() << "' " <<
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                    "type: " <<  new_var->type() << " " <<
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                    "type_name: " << new_var->type_name() << " to DDS." << endl; );
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                dds->add_var_nocopy(new_var);
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                Grid *grid = dynamic_cast <Grid *>(new_var);
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                if(grid){
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                    Grid::Map_iter m = grid->map_begin();
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                    for( ; m != grid->map_end() ; m++){
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                        shared_dim_candidates.insert((*m)->name());
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                    }
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                }
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                (*vIter) = 0;
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            }
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            delete new_vars;
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        }
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        else {
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            DBG( cerr << __func__ << "Adding variable '"<< (*i)->type_name() << " " <<  (*i)->name() << "' to drop list." << endl; );
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            dropped_vars.push_back((*i));
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        }
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    }
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    AttrTable *dv_table = Constructor::make_dropped_vars_attr_table(&dropped_vars);
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    if(dv_table){
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        DBG( cerr << __func__ << "() - Adding dropped variable AttrTable." << endl;);
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        dds_at->append_container(dv_table,dv_table->get_name());
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    }
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    // Get all the child groups.
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    D4Group::groupsIter gIter = root->grp_begin();
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    D4Group::groupsIter gEnd = root->grp_end();
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    for( ; gIter!=gEnd ; gIter++){
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        D4Group *grp = *gIter;
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        DBG( cerr << __func__ << "() - Processing D4Group " << grp->name() << endl;);
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        vector<BaseType *> *d2_vars = grp->transform_to_dap2(dds_at);
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        if(d2_vars){
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            DBG( cerr << __func__ << "() - Processing " << grp->name() << " Member Variables." << endl;);
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            vector<BaseType *>::iterator vIter = d2_vars->begin();
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            vector<BaseType *>::iterator vEnd = d2_vars->end();
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            for( ; vIter!=vEnd; vIter++){
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                DBG( cerr << __func__ << "() - Processing " << grp->name() << " Member Variable: " << (*vIter)->name() << endl;);
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                dds->add_var(*vIter);
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            }
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        }
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    }
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#endif
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    DBG( cerr << __func__ << "() - END" << endl;);
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    return dds;
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}
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DDS *DMR::getDDS()
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{
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    return DMR::getDDS(*this);
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}
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#endif
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D4Group *
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DMR::root()
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{
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	if (!d_root) d_root = static_cast<D4Group*>(d_factory->NewVariable(dods_group_c, "/"));
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	return d_root;
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}
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/**
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 * Given the DAP protocol version, parse that string and set the DMR fields.
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 *
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 * @param v The version string.
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 */
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void
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DMR::set_dap_version(const string &v)
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{
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    istringstream iss(v);
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    int major = -1, minor = -1;
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    char dot;
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    if (!iss.eof() && !iss.fail())
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        iss >> major;
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    if (!iss.eof() && !iss.fail())
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        iss >> dot;
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    if (!iss.eof() && !iss.fail())
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        iss >> minor;
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    if (major == -1 || minor == -1 or dot != '.')
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        throw InternalErr(__FILE__, __LINE__, "Could not parse dap version. Value given: " + v);
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    d_dap_version = v;
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    d_dap_major = major;
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    d_dap_minor = minor;
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    // Now set the related XML constants. These might be overwritten if
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    // the DMR instance is being built from a document parse, but if it's
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    // being constructed by a server the code to generate the XML document
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    // needs these values to match the DAP version information.
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    switch (d_dap_major) {
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        case 4:
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            d_namespace = c_dap40_namespace;
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            break;
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        default:
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            d_namespace = "";
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            break;
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    }
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}
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/** Get the size of a response, in kilobytes. This method looks at the
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 * variables in the DMR a computes the number of bytes in the response.
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 *
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 * @note This version of the method does a poor job with Arrays that
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 * have varying dimensions.
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 *
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 * @param constrained Should the size of the whole DMR be used or should the
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 * current constraint be taken into account?
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 * @return The size of the request in kilobytes
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 */
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long
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DMR::request_size(bool constrained)
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{
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    return d_root->request_size(constrained);
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}
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/**
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 * Print the DAP4 DMR object.
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 *
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 * @param xml use this XMLWriter to build the XML.
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 * @param constrained Should the DMR be subject to a constraint? Defaults to
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 * False
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 */
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void
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DMR::print_dap4(XMLWriter &xml, bool constrained)
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{
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    if (xmlTextWriterStartElement(xml.get_writer(), (const xmlChar*) "Dataset") < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write Dataset element");
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#if 0
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    // Reintroduce these if they are really useful. jhrg 4/15/13
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    if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "xmlns:xml",
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            (const xmlChar*) c_xml_namespace.c_str()) < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write attribute for xmlns:xml");
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    if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "xmlns:xsi", (const xmlChar*) c_xml_xsi.c_str())
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            < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write attribute for xmlns:xsi");
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    if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "xsi:schemaLocation",
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            (const xmlChar*) c_dap_40_n_sl.c_str()) < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write attribute for xmlns:schemaLocation");
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#endif
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    if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "xmlns", (const xmlChar*) get_namespace().c_str()) < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write attribute for xmlns");
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    if (!request_xml_base().empty()) {
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        if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "xml:base",
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                (const xmlChar*)request_xml_base().c_str()) < 0)
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            throw InternalErr(__FILE__, __LINE__, "Could not write attribute for xml:base");
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    }
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    if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "dapVersion",  (const xmlChar*)dap_version().c_str()) < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write attribute for dapVersion");
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    if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "dmrVersion", (const xmlChar*)dmr_version().c_str()) < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write attribute for dapVersion");
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    if (xmlTextWriterWriteAttribute(xml.get_writer(), (const xmlChar*) "name", (const xmlChar*)name().c_str()) < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not write attribute for name");
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    root()->print_dap4(xml, constrained);
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    if (xmlTextWriterEndElement(xml.get_writer()) < 0)
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        throw InternalErr(__FILE__, __LINE__, "Could not end the top-level Group element");
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}
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/** @brief dumps information about this object
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 *
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 * Displays the pointer value of this instance and then calls parent dump
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 *
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 * @param strm C++ i/o stream to dump the information to
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 * @return void
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 */
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void
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DMR::dump(ostream &strm) const
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{
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    strm << DapIndent::LMarg << "DMR::dump - ("
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    << (void *)this << ")" << endl ;
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    DapIndent::Indent() ;
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    strm << DapIndent::LMarg << "factory: " << (void *)d_factory << endl ;
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    strm << DapIndent::LMarg << "name: " << d_name << endl ;
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    strm << DapIndent::LMarg << "filename: " << d_filename << endl ;
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    strm << DapIndent::LMarg << "protocol major: " << d_dap_major << endl;
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    strm << DapIndent::LMarg << "protocol minor: " << d_dap_minor << endl;
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    DapIndent::UnIndent() ;
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}
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} // namespace libdap