libdap::Float32 Class Reference

Holds a 32-bit floating point value. More...

#include <Float32.h>

Inheritance diagram for libdap::Float32:

Collaboration diagram for libdap::Float32:

List of all members.

Public Types

typedef stack< BaseType * > btp_stack

Public Member Functions

virtual void add_var (BaseType *bt, Part part=nil)

Add a variable.

virtual unsigned int buf2val (void **val)

Reads the class data.

virtual bool check_semantics (string &msg, bool all=false)

Compare an object's current state with the semantics of its type.

virtual bool deserialize (UnMarshaller &um, DDS *dds, bool reuse=false)

Receive data from the net.

virtual void dump (ostream &strm) const

dumps information about this object

virtual int element_count (bool leaves=false)

Count the members of constructor types.

Float32 (const Float32 &copy_from)

Float32 (const string &n="")

virtual AttrTable & get_attr_table ()

virtual BaseType * get_parent ()

virtual bool is_constructor_type ()

Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable.

virtual bool is_in_selection ()

Is this variable part of the current selection?

virtual bool is_simple_type ()

Returns true if the instance is a numeric, string or URL type variable.

virtual bool is_vector_type ()

Returns true if the instance is a vector (i.e., array) type variable.

string name () const

Returns the name of the class instance.

Float32 & operator= (const Float32 &rhs)

virtual bool ops (BaseType *b, int op, const string &dataset)

Evaluate relational operators.

virtual void print_decl (ostream &out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)

Print an ASCII representation of the variable structure.

virtual void print_decl (FILE *out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)

Print an ASCII representation of the variable structure.

virtual void print_val (ostream &out, string space="", bool print_decl_p=true)

Prints the value of the variable.

virtual void print_val (FILE *out, string space="", bool print_decl_p=true)

Prints the value of the variable.

virtual void print_xml (ostream &out, string space=" ", bool constrained=false)

virtual void print_xml (FILE *out, string space=" ", bool constrained=false)

virtual BaseType * ptr_duplicate ()

virtual bool read (const string &dataset)

Read data into a local buffer.

virtual bool read_p ()

Has this variable been read?

virtual bool send_p ()

Should this variable be sent?

virtual bool serialize (const string &dataset, ConstraintEvaluator &eval, DDS &dds, Marshaller &m, bool ce_eval=true)

Move data to the net.

virtual void set_attr_table (const AttrTable &at)

virtual void set_in_selection (bool state)

virtual void set_name (const string &n)

Sets the name of the class instance.

virtual void set_parent (BaseType *parent)

virtual void set_read_p (bool state)

Sets the value of the read_p property.

virtual void set_send_p (bool state)

virtual void set_synthesized_p (bool state)

void set_type (const Type &t)

Sets the type of the class instance.

virtual bool set_value (dods_float32 f)

virtual bool synthesized_p ()

virtual string toString ()

Type type () const

Returns the type of the class instance.

string type_name () const

Returns the type of the class instance as a string.

virtual unsigned int val2buf (void *val, bool reuse=false)

Loads class data.

virtual dods_float32 value () const

virtual BaseType * var (const string &name, btp_stack &s)

virtual BaseType * var (const string &name="", bool exact_match=true, btp_stack *s=0)

Returns a pointer to a member of a constructor class.

virtual unsigned int width ()

Returns the size of the class instance data.

virtual ~Float32 ()

Abstract Methods

virtual void intern_data (const string &dataset, ConstraintEvaluator &eval, DDS &dds)

Protected Member Functions

void _duplicate (const BaseType &bt)

Perform a deep copy.

Protected Attributes

dods_float32 _buf

Friends

class Byte

class Float64

class Int16

class Int32

class UInt16

class UInt32

Detailed Description

See also:: BaseType

Definition at line 59 of file Float32.h.

Member Typedef Documentation

typedef stack<BaseType *> libdap::BaseType::btp_stack [inherited]

Definition at line 211 of file BaseType.h.

Constructor & Destructor Documentation

libdap::Float32::Float32 ( const string & n = "" )

The Float32 constructor accepts only the name of the variable. The name may be omitted, which will create a nameless variable. This may be adequate for some applications.

Parameters:

n

A string containing the name of the variable to be created.

Definition at line 66 of file Float32.cc.

Referenced by ptr_duplicate().

libdap::Float32::Float32 ( const Float32 & copy_from )

Definition at line 70 of file Float32.cc.

References _buf.

virtual libdap::Float32::~Float32 ( ) [inline, virtual]

Definition at line 81 of file Float32.h.

Member Function Documentation

void libdap::BaseType::_duplicate ( const BaseType & bt ) [protected, inherited]

Perform a deep copy. Copies the values of bt into *this. Pointers are dereferenced and their values are copied into a newly allocated instance.

Parameters:

bt

The source object.

Definition at line 66 of file BaseType.cc.

References libdap::BaseType::_name, libdap::BaseType::_read_p, libdap::BaseType::_send_p, libdap::BaseType::_synthesized_p, libdap::BaseType::_type, libdap::BaseType::d_attr, libdap::BaseType::d_in_selection, and libdap::BaseType::d_parent.

Referenced by libdap::BaseType::BaseType(), and libdap::BaseType::operator=().

void libdap::BaseType::add_var	(	BaseType *	bt,
		Part	part = `nil`
	)			`[virtual, inherited]`

Adds a variable to an instance of a constructor class, such as Array, Structure et cetera. This function is only used by those classes. For constructors with more than one variable, the variables appear in the same order in which they were added (i.e., the order in which add_var() was called). Since this method is only for use by Vectors and Constructors, the BaseType implementation throws InternalErr.

Note:: For the implementation of this method in Structure, Sequence, et c., first copy bt and then insert the copy. If bt is itself a constructor type you must either use the var() method to get a pointer to the actual instance added to *this or you must first add all of bt's children to it before adding it to *this. The implementations should use _duplicate() to perform a deep copy of bt.

Todo:: We should get rid of the Part parameter and adopt the convention that the first variable is the Array and all subsequent ones are Maps (when dealing with a Grid, the only time Part matters). This would enable several methods to migrate from Structure, Sequence and Grid to Constructor.

Parameters:

	bt	The variable to be added to this instance. The caller of this method must free memory it allocates for `v`. This method will make a deep copy of the object pointed to by `v`.
	part	The part of the constructor data to be modified. Only meaningful for Grid variables.

See also:: Part

Reimplemented in libdap::Array, libdap::Grid, libdap::Sequence, libdap::Structure, and libdap::Vector.

Definition at line 614 of file BaseType.cc.

Referenced by libdap::DDXParser::ddx_end_element().

unsigned int libdap::Float32::buf2val ( void ** val ) [virtual]

Reads the class data into the memory referenced by val. The caller should either allocate enough storage to val to hold the class data or set *val to null. If *val is NULL, memory will be allocated by this function with new(). If the memory is allocated this way, the caller is responsible for deallocating that memory. Array and values for simple types are stored as C would store an array.

Deprecated:: Use value() in the leaf classes.

Parameters:

val

A pointer to a pointer to the memory into which the class data will be copied. If the value pointed to is NULL, memory will be allocated to hold the data, and the pointer value modified accordingly. The calling program is responsible for deallocating the memory references by this pointer.

Returns:: The size (in bytes) of the information copied to val.

Implements libdap::BaseType.

Definition at line 147 of file Float32.cc.

References _buf, and width().

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bool libdap::BaseType::check_semantics	(	string &	msg,
		bool	all = `false`
	)			`[virtual, inherited]`

This function checks the class instance for internal consistency. This is important to check for complex constructor classes. For BaseType, an object is semantically correct if it has both a non-null name and type.

For example, an Int32 instance would return FALSE if it had no name or no type defined. A Grid instance might return FALSE for more complex reasons, such as having Map arrays of the wrong size or shape.

This function is used by the DDS class, and will rarely, if ever, be explicitly called by a DODS application program. A variable must pass this test before it is sent, but there may be many other stages in a retrieve operation where it would fail.

Returns:: Returns FALSE when the current state violates some aspect of the type semantics, TRUE otherwise.

Parameters:

	msg	A returned string, containing a message indicating the source of any problem.
	all	For complex constructor types (Grid, Sequence, Structure), this flag indicates whether to check the semantics of the member variables, too.

See also:: DDS::check_semantics

Reimplemented in libdap::Array, libdap::Grid, libdap::Sequence, libdap::Structure, and libdap::Vector.

Definition at line 932 of file BaseType.cc.

References libdap::dods_null_c.

Referenced by libdap::Vector::check_semantics(), libdap::Structure::check_semantics(), libdap::Sequence::check_semantics(), libdap::Grid::check_semantics(), and libdap::Array::check_semantics().

bool libdap::Float32::deserialize	(	UnMarshaller &	um,
		DDS *	dds,
		bool	reuse = `false`
	)			`[virtual]`

Receives data from the network connection identified by the source parameter. The data is put into the class data buffer according to the input dds.

This function is only used on the client side of the DODS client/server connection.

Parameters:

	um	An UnMarshaller that knows how to deserialize data types
	dds	The Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure. This would have been received from the server in an earlier transmission.
	reuse	A boolean value, indicating whether the class internal data storage can be reused or not. If this argument is TRUE, the class buffer is assumed to be large enough to hold the incoming data, and it is not reallocated. If FALSE, new storage is allocated. If the internal buffer has not been allocated at all, this argument has no effect.

Returns:: Always returns TRUE.

Exceptions:

Error

when a problem reading from the UnMarshaller is found.

See also:: DDS

Implements libdap::BaseType.

Definition at line 122 of file Float32.cc.

References _buf, and libdap::UnMarshaller::get_float32().

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void libdap::Float32::dump ( ostream & strm ) const [virtual]

Displays the pointer value of this instance and information about this instance.

Parameters:

strm

C++ i/o stream to dump the information to

Returns:: void

Reimplemented from libdap::BaseType.

Definition at line 263 of file Float32.cc.

References _buf, libdap::BaseType::dump(), libdap::DapIndent::Indent(), libdap::DapIndent::LMarg(), and libdap::DapIndent::UnIndent().

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int libdap::BaseType::element_count ( bool leaves = false ) [virtual, inherited]

Return a count of the total number of variables in this variable. This is used to count the number of variables held by a constructor variable - for simple type and vector variables it always returns 1.

For compound data types, there are two ways to count members. You can count the members, or you can count the simple members and add that to the count of the compound members. For example, if a Structure contains an Int32 and another Structure that itself contains two Int32 members, the element count of the top-level structure could be two (one Int32 and one Structure) or three (one Int32 by itself and two Int32's in the subsidiary Structure). Use the leaves parameter to control which kind of counting you desire.

Returns:: Returns 1 for simple types. For compound members, the count depends on the leaves argument.

Parameters:

leaves

This parameter is only relevant if the object contains other compound data types. If FALSE, the function counts only the data variables mentioned in the object's declaration. If TRUE, it counts the simple members, and adds that to the sum of the counts for the compound members. This parameter has no effect for simple type variables.

Reimplemented in libdap::Grid, libdap::Sequence, libdap::Structure, and libdap::Vector.

Definition at line 357 of file BaseType.cc.

Referenced by libdap::Vector::element_count().

AttrTable & libdap::BaseType::get_attr_table ( ) [virtual, inherited]

Get this variable's AttrTable. It's generally a bad idea to return a reference to a contained object, but in this case it seems that building an interface inside BaseType is overkill.

Use the AttrTable methods to manipulate the table.

Definition at line 480 of file BaseType.cc.

Referenced by libdap::DDS::find_matching_container(), libdap::Constructor::find_matching_container(), libdap::Grid::print_xml(), libdap::Constructor::print_xml(), libdap::BaseType::print_xml(), and libdap::Array::print_xml_core().

BaseType * libdap::BaseType::get_parent ( ) [virtual, inherited]

Return a pointer to the Constructor or Vector which holds (contains) this variable. If this variable is at the top level, this method returns null.

Returns:: A BaseType pointer to the variable's parent.

Definition at line 550 of file BaseType.cc.

Referenced by libdap::DDS::find_matching_container(), libdap::Constructor::find_matching_container(), libdap::function_linear_scale(), libdap::Sequence::intern_data_for_leaf(), libdap::Sequence::intern_data_parent_part_two(), libdap::Sequence::serialize_leaf(), and libdap::Sequence::serialize_parent_part_two().

void libdap::BaseType::intern_data	(	const string &	dataset,
		ConstraintEvaluator &	eval,
		DDS &	dds
	)			`[virtual, inherited]`

Similar to using serialize() and deserialize() together in one object. Data are read as for serialize and those values are stored in the objects as deserialize() does but does not write and then read data to/from a stream.

This method is defined by the various data type classes. It calls the read() abstract method.

Parameters:

	dataset	The (local) name of dataset to be read.
	eval	Use this as the constraint expression evaluator.
	dds	The Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure.

Reimplemented in libdap::Grid, libdap::Sequence, libdap::Structure, and libdap::Vector.

Definition at line 699 of file BaseType.cc.

References libdap::BaseType::read(), libdap::BaseType::read_p(), libdap::DDS::timeout_off(), and libdap::DDS::timeout_on().

Referenced by libdap::Grid::intern_data().

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bool libdap::BaseType::is_constructor_type ( ) [virtual, inherited]

Returns:: True if the instance is a Structure, Sequence or Grid, False otherwise.

Definition at line 306 of file BaseType.cc.

References libdap::dods_array_c, libdap::dods_byte_c, libdap::dods_float32_c, libdap::dods_float64_c, libdap::dods_grid_c, libdap::dods_int16_c, libdap::dods_int32_c, libdap::dods_null_c, libdap::dods_sequence_c, libdap::dods_str_c, libdap::dods_structure_c, libdap::dods_uint16_c, libdap::dods_uint32_c, libdap::dods_url_c, and libdap::BaseType::type().

Referenced by libdap::DDXParser::ddx_end_element(), libdap::DDS::leaf_match(), libdap::DDS::transfer_attributes(), libdap::Constructor::transfer_attributes(), and libdap::Vector::var().

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bool libdap::BaseType::is_in_selection ( ) [virtual, inherited]

Does this variable appear in either the selection part or as a function argument in the current constrain expression. If this property is set (true) then implementations of the read() method should read this variable.

Note:: This method does not check, nor does it know about the semantics of, string arguments passed to functions. Those functions might include variable names in strings; they are responsible for reading those variables. See the grid (func_grid_select()) for an example.

See also:: BaseType::read()

Definition at line 505 of file BaseType.cc.

bool libdap::BaseType::is_simple_type ( ) [virtual, inherited]

Returns:: True if the instance is a scalar numeric, String or URL variable, False otherwise. Arrays (even of simple types) return False.

See also:: is_vector_type()

Definition at line 245 of file BaseType.cc.

References libdap::dods_array_c, libdap::dods_byte_c, libdap::dods_float32_c, libdap::dods_float64_c, libdap::dods_grid_c, libdap::dods_int16_c, libdap::dods_int32_c, libdap::dods_null_c, libdap::dods_sequence_c, libdap::dods_str_c, libdap::dods_structure_c, libdap::dods_uint16_c, libdap::dods_uint32_c, libdap::dods_url_c, and libdap::BaseType::type().

Referenced by libdap::Grid::check_semantics(), libdap::extract_double_array(), libdap::extract_double_value(), and libdap::set_array_using_double().

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bool libdap::BaseType::is_vector_type ( ) [virtual, inherited]

Returns:: True if the instance is an Array, False otherwise.

Definition at line 274 of file BaseType.cc.

References libdap::dods_array_c, libdap::dods_byte_c, libdap::dods_float32_c, libdap::dods_float64_c, libdap::dods_grid_c, libdap::dods_int16_c, libdap::dods_int32_c, libdap::dods_null_c, libdap::dods_sequence_c, libdap::dods_str_c, libdap::dods_structure_c, libdap::dods_uint16_c, libdap::dods_uint32_c, libdap::dods_url_c, and libdap::BaseType::type().

Referenced by libdap::DDXParser::ddx_end_element().

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string libdap::BaseType::name ( ) const [inherited]

Definition at line 173 of file BaseType.cc.

Float32 & libdap::Float32::operator= ( const Float32 & rhs )

Definition at line 82 of file Float32.cc.

References _buf.

bool libdap::Float32::ops	(	BaseType *	b,
		int	op,
		const string &	dataset
	)			`[virtual]`

This method contains the relational operators used by the constraint expression evaluator in the DDS class. Each class that wants to be able to evaluate relational expressions must overload this function. The implementation in BaseType throws an InternalErr exception. The DAP library classes Byte, ..., Url provide specializations of this method. It is not meaningful for classes such as Array because relational expressions using Array are not supported.

The op argument refers to a table generated by bison from the constraint expression parser. Use statements like the following to correctly interpret its value:

    switch (op) {
        case EQUAL: return i1 == i2;
        case NOT_EQUAL: return i1 != i2;
        case GREATER: return i1 > i2;
        case GREATER_EQL: return i1 >= i2;
        case LESS: return i1 < i2;
        case LESS_EQL: return i1 <= i2;
        case REGEXP: throw Error("Regular expressions are not supported for integer values");
        default: throw Error("Unknown operator");
    }

This function is used by the constraint expression evaluator.

Parameters:

	b	Compare the value of this instance with b.
	op	An integer index indicating which relational operator is implied. Choose one from the following: `EQUAL`, `NOT_EQUAL`, `GREATER`, `GREATER_EQL`, `LESS`, `LESS_EQL`, and `REGEXP`.
	dataset	The name of the dataset from which the instance's data has come (or is to come).

Returns:: The boolean value of the comparison.

Reimplemented from libdap::BaseType.

Definition at line 211 of file Float32.cc.

References _buf, libdap::dods_byte_c, libdap::dods_float32_c, libdap::dods_float64_c, libdap::dods_int16_c, libdap::dods_int32_c, libdap::dods_uint16_c, libdap::dods_uint32_c, libdap::BaseType::read(), libdap::BaseType::read_p(), and libdap::BaseType::type().

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void libdap::BaseType::print_decl	(	ostream &	out,
		string	space = `" "`,
		bool	print_semi = `true`,
		bool	constraint_info = `false`,
		bool	constrained = `false`
	)			`[virtual, inherited]`

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

    Float64 lat[lat = 180];

While a more complex declaration (for a Grid, in this case), would look like this:

    Grid {
    ARRAY:
    Int32 sst[time = 404][lat = 180][lon = 360];
    MAPS:
    Float64 time[time = 404];
    Float64 lat[lat = 180];
    Float64 lon[lon = 360];
    } sst;

Parameters:

	out	The output stream on which to print the declaration.
	space	Each line of the declaration will begin with the characters in this string. Usually used for leading spaces.
	print_semi	A boolean value indicating whether to print a semicolon at the end of the declaration.
	constraint_info	A boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, `print_decl()` prints the value of the variable's `send_p()` flag after the declaration.
	constrained	If this boolean value is TRUE, the variable's declaration is only printed if is the `send_p()` flag is TRUE. If a constraint expression is in place, and this variable is not requested, the `send_p()` flag is FALSE.

See also:: DDS
DDS::CE

Reimplemented in libdap::Array, libdap::Constructor, and libdap::Grid.

Definition at line 817 of file BaseType.cc.

References libdap::id2www(), libdap::BaseType::send_p(), and libdap::BaseType::type_name().

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void libdap::BaseType::print_decl	(	FILE *	out,
		string	space = `" "`,
		bool	print_semi = `true`,
		bool	constraint_info = `false`,
		bool	constrained = `false`
	)			`[virtual, inherited]`

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

    Float64 lat[lat = 180];

While a more complex declaration (for a Grid, in this case), would look like this:

    Grid {
    ARRAY:
    Int32 sst[time = 404][lat = 180][lon = 360];
    MAPS:
    Float64 time[time = 404];
    Float64 lat[lat = 180];
    Float64 lon[lon = 360];
    } sst;

Parameters:

	out	The output stream on which to print the declaration.
	space	Each line of the declaration will begin with the characters in this string. Usually used for leading spaces.
	print_semi	A boolean value indicating whether to print a semicolon at the end of the declaration.
	constraint_info	A boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, `print_decl()` prints the value of the variable's `send_p()` flag after the declaration.
	constrained	If this boolean value is TRUE, the variable's declaration is only printed if is the `send_p()` flag is TRUE. If a constraint expression is in place, and this variable is not requested, the `send_p()` flag is FALSE.

See also:: DDS
DDS::CE

Reimplemented in libdap::Array, libdap::Constructor, and libdap::Grid.

Definition at line 752 of file BaseType.cc.

References libdap::id2www(), libdap::BaseType::send_p(), and libdap::BaseType::type_name().

Referenced by libdap::DODSFilter::functional_constraint(), libdap::Grid::print_decl(), libdap::Array::print_decl(), libdap::UInt32::print_val(), libdap::UInt16::print_val(), libdap::Str::print_val(), libdap::Int32::print_val(), libdap::Int16::print_val(), libdap::Float64::print_val(), print_val(), and libdap::Byte::print_val().

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void libdap::Float32::print_val	(	ostream &	out,
		string	space = `""`,
		bool	print_decl_p = `true`
	)			`[virtual]`

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters:

	out	The output ostream on which to print the value.
	space	This value is passed to the print_decl() function, and controls the leading spaces of the output.
	print_decl_p	A boolean value controlling whether the variable declaration is printed as well as the value.

Implements libdap::BaseType.

Definition at line 197 of file Float32.cc.

References _buf, and libdap::BaseType::print_decl().

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void libdap::Float32::print_val	(	FILE *	out,
		string	space = `""`,
		bool	print_decl_p = `true`
	)			`[virtual]`

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters:

	out	The output FILE on which to print the value.
	space	This value is passed to the print_decl() function, and controls the leading spaces of the output.
	print_decl_p	A boolean value controlling whether the variable declaration is printed as well as the value.

Implements libdap::BaseType.

Definition at line 183 of file Float32.cc.

References _buf, and libdap::BaseType::print_decl().

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void libdap::BaseType::print_xml	(	ostream &	out,
		string	space = `" "`,
		bool	constrained = `false`
	)			`[virtual, inherited]`

Write the XML representation of this variable. This method is used to build the DDX XML response.

Parameters:

	out	Destination output stream
	space	Use this to indent child declarations. Default is "".
	constrained	If true, only print this if it's part part of the current projection. Default is False.

Reimplemented in libdap::Array, libdap::Constructor, and libdap::Grid.

Definition at line 872 of file BaseType.cc.

References libdap::BaseType::get_attr_table(), libdap::AttrTable::get_size(), libdap::id2xml(), libdap::AttrTable::print_xml(), libdap::BaseType::send_p(), and libdap::BaseType::type_name().

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void libdap::BaseType::print_xml	(	FILE *	out,
		string	space = `" "`,
		bool	constrained = `false`
	)			`[virtual, inherited]`

Write the XML representation of this variable. This method is used to build the DDX XML response.

Parameters:

	out	Destination.
	space	Use this to indent child declarations. Default is "".
	constrained	If true, only print this if it's part part of the current projection. Default is False.

Reimplemented in libdap::Array, libdap::Constructor, and libdap::Grid.

Definition at line 845 of file BaseType.cc.

References libdap::BaseType::get_attr_table(), libdap::AttrTable::get_size(), libdap::id2xml(), libdap::AttrTable::print_xml(), libdap::BaseType::send_p(), and libdap::BaseType::type_name().

Referenced by libdap::Array::print_xml_core().

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BaseType * libdap::Float32::ptr_duplicate ( ) [virtual]

Clone this instance. Allocate a new instance and copy *this into it. This method must perform a deep copy.

Note:: This method should not copy data values, but must copy all other fields in the object.

Returns:: A newly allocated copy of this.

Implements libdap::BaseType.

Definition at line 76 of file Float32.cc.

References Float32().

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bool libdap::BaseType::read ( const string & dataset ) [virtual, inherited]

This method should be implemented for each of the data type classes (Byte, ..., Grid) when using the DAP class library to build a server. This method is only for DAP servers. The library provides a default definition here which throws an InternalErr exception unless the read_p property has been set. In that case it returns false, indicating that all the data have been read. The latter case can happen when building a constant value that needs to be passed to a function. The variable/constant is loaded with a value when it is created.

When implementing a new DAP server, the Byte, ..., Grid data type classes are usually specialized. In each of those specializations read() should be defined to read values from the data source and store them in the object's local buffer. The read() method is called by other methods in this library. When writing read(), follow these rules:

read() should throw Error if it encounters an error. The message should be verbose enough to be understood by someone running a client on a different machine.
The value(s) should be read if and only if either send_p() or is_in_selection() return true. If neither of these return true, the value(s) should not be read. This is important when writing read() for a Constructor type such as Grid where a client may ask for only the map vectors (and thus reading the much larger Array part is not needed).
For each specialization of read(), the method should first test the value of the read_p property (using the read_p() method) and read values only if the value of read_p() is false. Once the read() method reads data and stores it in the instance, it must set the value of the read_p property to true using set_read_p(). If your read() methods fail to do this data may not serialize correctly.
The Array::read() and Grid::read() methods should take into account any restrictions on Array sizes.
If you are writing Sequence::read(), be sure to check the documentation for Sequence::read_row() and Sequence::serialize() so you understand how Sequence::read() is being called.
For Sequence::read(), your specialization must correctly manage the unsent_data property and row count in addition to the read_p property (handle the read_p property as describe above). For a Sequence to serialize correctly, once all data from the Sequence has been read, unsent_data property must be set to false (use Sequence::set_unsent_data()). Also, at that time the row number counter must be reset (use Sequence::reset_row_counter()). Typically the correct time to set unsent_data to false and reset the row counter is the time when Sequence::read() return false indicating that all the data for the Sequence have been read. Failure to handle these tasks will break serialization of nested Sequences. Note that when


Public Types
typedef stack< BaseType * >	btp_stack
Public Member Functions
virtual void	add_var (BaseType *bt, Part part=nil)
	Add a variable.
virtual unsigned int	buf2val (void **val)
	Reads the class data.
virtual bool	check_semantics (string &msg, bool all=false)
	Compare an object's current state with the semantics of its type.
virtual bool	deserialize (UnMarshaller &um, DDS *dds, bool reuse=false)
	Receive data from the net.
virtual void	dump (ostream &strm) const
	dumps information about this object
virtual int	element_count (bool leaves=false)
	Count the members of constructor types.
	Float32 (const Float32 &copy_from)
	Float32 (const string &n="")
virtual AttrTable &	get_attr_table ()
virtual BaseType *	get_parent ()
virtual bool	is_constructor_type ()
	Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable.
virtual bool	is_in_selection ()
	Is this variable part of the current selection?
virtual bool	is_simple_type ()
	Returns true if the instance is a numeric, string or URL type variable.
virtual bool	is_vector_type ()
	Returns true if the instance is a vector (i.e., array) type variable.
string	name () const
	Returns the name of the class instance.
Float32 &	operator= (const Float32 &rhs)
virtual bool	ops (BaseType *b, int op, const string &dataset)
	Evaluate relational operators.
virtual void	print_decl (ostream &out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)
	Print an ASCII representation of the variable structure.
virtual void	print_decl (FILE *out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)
	Print an ASCII representation of the variable structure.
virtual void	print_val (ostream &out, string space="", bool print_decl_p=true)
	Prints the value of the variable.
virtual void	print_val (FILE *out, string space="", bool print_decl_p=true)
	Prints the value of the variable.
virtual void	print_xml (ostream &out, string space=" ", bool constrained=false)
virtual void	print_xml (FILE *out, string space=" ", bool constrained=false)
virtual BaseType *	ptr_duplicate ()
virtual bool	read (const string &dataset)
	Read data into a local buffer.
virtual bool	read_p ()
	Has this variable been read?
virtual bool	send_p ()
	Should this variable be sent?
virtual bool	serialize (const string &dataset, ConstraintEvaluator &eval, DDS &dds, Marshaller &m, bool ce_eval=true)
	Move data to the net.
virtual void	set_attr_table (const AttrTable &at)
virtual void	set_in_selection (bool state)
virtual void	set_name (const string &n)
	Sets the name of the class instance.
virtual void	set_parent (BaseType *parent)
virtual void	set_read_p (bool state)
	Sets the value of the read_p property.
virtual void	set_send_p (bool state)
virtual void	set_synthesized_p (bool state)
void	set_type (const Type &t)
	Sets the type of the class instance.
virtual bool	set_value (dods_float32 f)
virtual bool	synthesized_p ()
virtual string	toString ()
Type	type () const
	Returns the type of the class instance.
string	type_name () const
	Returns the type of the class instance as a string.
virtual unsigned int	val2buf (void *val, bool reuse=false)
	Loads class data.
virtual dods_float32	value () const
virtual BaseType *	var (const string &name, btp_stack &s)
virtual BaseType *	var (const string &name="", bool exact_match=true, btp_stack *s=0)
	Returns a pointer to a member of a constructor class.
virtual unsigned int	width ()
	Returns the size of the class instance data.
virtual	~Float32 ()
Abstract Methods

virtual void	intern_data (const string &dataset, ConstraintEvaluator &eval, DDS &dds)
Protected Member Functions
void	_duplicate (const BaseType &bt)
	Perform a deep copy.
Protected Attributes
dods_float32	_buf
Friends
class	Byte
class	Float64
class	Int16
class	Int32
class	UInt16
class	UInt32