ISO2709RecordSetArray Class Reference

Inheritance diagram for ISO2709RecordSetArray:

Public Member Functions
	__construct ( $input, $numCache=10)
	offsetExists ( $offset)
	offsetGet ( $offset)
	offsetSet ( $offset, $value)
	offsetUnset ( $offset)

Protected Attributes
	$input
	$records
	$numRecords
	$cache
	$recordOffsets
	$numCache
	$recordClass

Detailed Description

Definition at line 51 of file ISO2709.php.

Constructor & Destructor Documentation

__construct()

ISO2709RecordSetArray::__construct	(		$input,
			$numCache = 10
	)

Definition at line 54 of file ISO2709.php.

                                                   {

        if( is_string( $input ) ) $input = fopen( $input, "rb" );

        if( !is_resource( $input ) ) throw new Exception("ISO2709RecordSetArray requires a file resource, filename, or URL to be created");

        $this->input = $input;

        $this->records = array();

        $this->cache = array();

        $this->recordOffsets = array();

        $this->recordOffsets[0] = 0;

        $this->numCache = $numCache;

        $this->recordClass = "ISO2709Record";

    }

References $input, and $numCache.

Member Function Documentation

offsetExists()

ISO2709RecordSetArray::offsetExists

(

$offset

)

Definition at line 66 of file ISO2709.php.

                                            {

        if(!is_int($offset) or $offset < 0 or ($this->numRecords !== null and $this->numRecords <= $offset))

            return false;

        return $this->offsetGet( $offset ) === false;

    }

References offsetGet().

offsetGet()

ISO2709RecordSetArray::offsetGet

(

$offset

)

Definition at line 72 of file ISO2709.php.

                                          {

        # Update cache


        foreach( array_keys( $this->cache, $offset ) as $k ) { unset($this->cache[$k]); }

        $this->cache = array_values( $this->cache );

        array_push( $this->cache, $offset );

        while( count( $this->cache ) > $this->numCache ) {

            $k = array_shift( $this->cache );

            unset( $this->records[$k] );

        }

        # Now get the record


        if( !isset( $this->records[ $offset ] ) ) {

            if( !isset( $this->recordOffsets[$offset] ) ) {

                for( $i = $offset - 1 ; $i > 0 ; $i-- ) {

                    if( isset( $this->recordOffsets[$i] ) ) break;

                }

                fseek( $this->input, $this->recordOffsets[$i], SEEK_SET );

                while( $i < $offset ) {

                    stream_get_line( $this->input, 99999, ISO2709::RecordTerminator );

                    $i++;

                    $this->recordOffsets[ $i ] = ftell( $this->input );

                }

            } else {

                fseek( $this->input, $this->recordOffsets[$offset], SEEK_SET );

            }

            $this->records[ $offset ] = new $this->recordClass();

            $this->records[ $offset ]->loadFromBinaryStream( $this->input );

            if(feof($this->input)) {

                $this->numRecords = $offset+1;

            } else {

                $this->recordOffsets[$offset+1] = ftell( $this->input );

            }

        }

        return $this->records[ $offset ];

    }

References ISO2709\RecordTerminator.

Referenced by offsetExists().

offsetSet()

ISO2709RecordSetArray::offsetSet	(		$offset,
			$value
	)

Definition at line 107 of file ISO2709.php.

                                                  {

        throw new Exception( "This type of record set is read-only, sorry" );

    }

offsetUnset()

ISO2709RecordSetArray::offsetUnset

(

$offset

)

Definition at line 111 of file ISO2709.php.

                                            {

        throw new Exception( "This type of record set is read-only, sorry" );

    }

Member Data Documentation

$cache

ISO2709RecordSetArray::$cache

protected

Definition at line 52 of file ISO2709.php.

$input

ISO2709RecordSetArray::$input

protected

Definition at line 52 of file ISO2709.php.

Referenced by MARC21RecordSetArray\__construct(), and __construct().

$numCache

ISO2709RecordSetArray::$numCache

protected

Definition at line 52 of file ISO2709.php.

Referenced by __construct().

$numRecords

ISO2709RecordSetArray::$numRecords

protected

Definition at line 52 of file ISO2709.php.

$recordClass

ISO2709RecordSetArray::$recordClass

protected

Definition at line 52 of file ISO2709.php.

$recordOffsets

ISO2709RecordSetArray::$recordOffsets

protected

Definition at line 52 of file ISO2709.php.

$records

ISO2709RecordSetArray::$records

protected

Definition at line 52 of file ISO2709.php.

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The documentation for this class was generated from the following file:

• grimas/ISO2709.php