Str.cc

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// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
 
// Copyright (c) 2002,2003 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 
// (c) COPYRIGHT URI/MIT 1994-1999
// Please read the full copyright statement in the file COPYRIGHT_URI.
//
// Authors:
//      jhrg,jimg       James Gallagher <jgallagher@gso.uri.edu>
 
// Implementation for Str.
//
// jhrg 9/7/94
 
#include "config.h"
 
#include <sstream>
 
#include "Byte.h"
#if 0
#include "Float32.h"
#include "Float64.h"
#include "Int16.h"
#include "Int32.h"
#include "UInt16.h"
#include "UInt32.h"
#endif
#include "Str.h"
#include "Url.h"
 
#if 0
#include "Array.h"
#include "Grid.h"
#include "Sequence.h"
#include "Structure.h"
#endif
 
#include "DDS.h"
#include "Marshaller.h"
#include "UnMarshaller.h"
 
#include "D4StreamMarshaller.h"
#include "D4StreamUnMarshaller.h"
#include "DMR.h"
 
#include "util.h"
 
#if 0
#include "parser.h"
#endif
#include "DapIndent.h"
#include "InternalErr.h"
#include "Operators.h"
#include "debug.h"
#include "escaping.h"
 
using std::cerr;
using std::endl;
 
namespace libdap {

Str::Str(const string &n) : BaseType(n, dods_str_c), d_buf("") {}

Str::Str(const string &n, const string &d) : BaseType(n, d, dods_str_c), d_buf("") {}
 
Str::Str(const Str &copy_from) : BaseType(copy_from) { d_buf = copy_from.d_buf; }
 
BaseType *Str::ptr_duplicate() { return new Str(*this); }
 
Str &Str::operator=(const Str &rhs) {
    if (this == &rhs)
        return *this;
    BaseType::operator=(rhs);
    d_buf = rhs.d_buf;
    return *this;
}
 
int Str::length() const { return (int)d_buf.length(); }
 
int64_t Str::length_ll() const { return (int64_t)d_buf.length(); }
 
bool Str::serialize(ConstraintEvaluator &eval, DDS &dds, Marshaller &m, bool ce_eval) {
 
    DBG(cerr << "Entering (" << this->name() << " [" << this << "])" << endl);
#if USE_LOCAL_TIMEOUT_SCHEME
    dds.timeout_on();
#endif
    if (!read_p())
        read();
 
    if (ce_eval && !eval.eval_selection(dds, dataset()))
        return true;
#if USE_LOCAL_TIMEOUT_SCHEME
    dds.timeout_off();
#endif
    m.put_str(d_buf);
 
    DBG(cerr << "Exiting: buf = " << d_buf << endl);
 
    return true;
}
 
// deserialize the string on stdin and put the result in BUF.
 
bool Str::deserialize(UnMarshaller &um, DDS *, bool) {
    um.get_str(d_buf);
 
    return false;
}
 
void Str::compute_checksum(Crc32 &checksum) {
    checksum.AddData(reinterpret_cast<const uint8_t *>(d_buf.data()), d_buf.length());
}

void Str::serialize(D4StreamMarshaller &m, DMR &, /*ConstraintEvaluator &,*/ bool) {
    if (!read_p())
        read(); // read() throws Error
 
    m.put_str(d_buf);
}
 
void Str::deserialize(D4StreamUnMarshaller &um, DMR &) { um.get_str(d_buf); }

unsigned int Str::buf2val(void **val) {
    // Jose Garcia
    // The same comment justifying throwing an Error in val2buf applies here.
    if (!val)
        throw InternalErr(__FILE__, __LINE__, "No place to store a reference to the data.");
    // If *val is null, then the caller has not allocated storage for the
    // value; we must. If there is storage there, assume it is a string and
    // assign d_buf's value to that storage.
    if (!*val)
        *val = new string(d_buf);
    else
        *static_cast<string *>(*val) = d_buf;
 
    return sizeof(string *);
}

unsigned int Str::val2buf(void *val, bool) {
    // Jose Garcia
    // This method is public therefore and I believe it has being designed
    // to be use by read which must be implemented on the surrogated library,
    // thus if the pointer val is NULL, is an Internal Error.
    if (!val)
        throw InternalErr(__FILE__, __LINE__, "NULL pointer.");
 
    d_buf = *static_cast<string *>(val);
 
    return sizeof(string *);
}

bool Str::set_value(const string &value) {
    d_buf = value;
    set_read_p(true);
 
    return true;
}

string Str::value() const { return d_buf; }
 
void Str::print_val(FILE *out, string space, bool print_decl_p) {
    ostringstream oss;
    print_val(oss, space, print_decl_p);
    fwrite(oss.str().data(), sizeof(char), oss.str().length(), out);
}

string Str::esc_string_variable_value(const string &s) { return escattr(s); }
 
void Str::print_val(ostream &out, string space, bool print_decl_p) {
    if (print_decl_p) {
        print_decl(out, space, false);
        out << " = \"" << esc_string_variable_value(d_buf) << "\";" << endl;
    } else {
        out << "\"" << esc_string_variable_value(d_buf) << "\"";
    }
}
 
bool Str::ops(BaseType *b, int op) {
    // Extract the Byte arg's value.
    if (!read_p() && !read()) {
        // Jose Garcia
        // Since the read method is virtual and implemented outside
        // libdap++ if we cannot read the data that is the problem
        // of the user or of whoever wrote the surrogate library
        // implementing read therefore it is an internal error.
        throw InternalErr(__FILE__, __LINE__, "This value was not read!");
    }
 
    // Extract the second arg's value.
    if (!b || !(b->read_p() || b->read())) {
        // Jose Garcia
        // Since the read method is virtual and implemented outside
        // libdap++ if we cannot read the data that is the problem
        // of the user or of whoever wrote the surrogate library
        // implementing read therefore it is an internal error.
        throw InternalErr(__FILE__, __LINE__, "Argument value was not read!");
    }
 
    return d4_ops(b, op);
}

bool Str::d4_ops(BaseType *b, int op) {
    switch (b->type()) {
    case dods_byte_c:
    case dods_int8_c:
    case dods_int16_c:
    case dods_uint16_c:
    case dods_int32_c:
    case dods_uint32_c:
    case dods_int64_c:
    case dods_uint64_c:
    case dods_float32_c:
    case dods_float64_c:
        throw Error(malformed_expr, "Relational operators can only compare compatible types (string, number).");
    case dods_str_c:
        return StrCmp<string, string>(op, d_buf, static_cast<Str *>(b)->value());
    case dods_url_c:
        return StrCmp<string, string>(op, d_buf, static_cast<Url *>(b)->value());
    default:
        throw Error(malformed_expr, "Relational operators only work with scalar types.");
    }
}

void Str::dump(ostream &strm) const {
    strm << DapIndent::LMarg << "Str::dump - (" << (void *)this << ")" << endl;
    DapIndent::Indent();
    BaseType::dump(strm);
    strm << DapIndent::LMarg << "value: " << d_buf << endl;
    DapIndent::UnIndent();
}
 
} // namespace libdap