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public LDAPVirtualListControl( int startIndex, int beforeCount, int afterCount, int contentCount ) { super( VIRTUALLIST, true, null ); m_listSize = contentCount; setRange( startIndex, beforeCount, afterCount ); }
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The parameters of the LDAPControl constructor used in this case are the OID of the control, a boolean isCritical (if it is true, a request containing the control will be rejected if the server does not support the control; if false, the server will ignore the control if it is not recognized), and a byte array containing an arbitrary value of the control The value is passed as null in this case because the control creates a BERencoded byte array from the constructor parameters in the setRange method The contents of the control are de ned in ASN1 notation as follows:
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VirtualListViewRequest ::= SEQUENCE { beforeCount INTEGER (0 maxInt), afterCount INTEGER (0 maxInt), CHOICE { byIndex [0] SEQUENCE { index INTEGER, contentCount INTEGER } byFilter [1] jumpTo Substring }, contextID OCTET STRING OPTIONAL }
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Note that there is an optional nal STRING eld The control includes a CHOICE statement, so there are two possible data contents The number in brackets after the name of each option is the tag that identi es which case is implemented in an instance of the control LDAPVirtualListControl constructs the rst option as follows:
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private final static int TAG_BYINDEX = 0; private final static int TAG_BYFILTER = 1; private byte[] createPageSpecification( int int int int listIndex, listSize, beforeCount, afterCount ) {
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/* A sequence */ BERSequence seq = new BERSequence(); seqaddElement( new BERInteger( beforeCount ) ); seqaddElement( new BERInteger( afterCount ) ); /* A sequence of list index and list size */ BERSequence indexSeq = new BERSequence(); indexSeqaddElement( new BERInteger(listIndex) ); indexSeqaddElement( new BERInteger(listSize) ); seqaddElement( new BERTag( BERTagCONTEXT|BERTagCONSTRUCTED| TAG_BYINDEX, indexSeq, true) ); if ( _context != null ) { seqaddElement( new BEROctetString(_context) ); } /* Suck out the data and return it */ return flattenBER( seq ); }
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We create the required BER-encoded byte array by instantiating various basic BER objects (BERInteger in this case), adding them to sequence elements (BERSequence) as dictated by the ASN1 for the particular control, and then streaming the outermost element to a byte array Since the VLV request control contains a CHOICE eld, it must also include a tag (BERTag) that indicates which of the options is present The flattenBER method in LDAPControl (which is the superclass for all control classes) converts the results into a byte array appropriate for transmission in an LDAP request When a string rather than an index is used to identify the rst result, the following code constructs the byte array
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private byte[] createPageSpecification( String subFilter, int beforeCount, int afterCount ) { /* A sequence */ BERSequence seq = new BERSequence(); seqaddElement( new BERInteger( beforeCount ) ); seqaddElement( new BERInteger( afterCount ) ); seqaddElement( new BERTag( BERTagCONTEXT|TAG_BYFILTER, new BEROctetString(subFilter), true) ); /* Optional context cookie */ if ( _context != null ) { seqaddElement( new BEROctetString(_context) );
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} /* Suck out the data and return it */ return flattenBER( seq ); }
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The string option uses a BEROctetString to encode the value and sets the tag for the CHOICE eld to 1 (TAG_BY_FILTER) The BERTagCONTEXT constant, which is OR ed with the tag number, indicates that the tag number is speci c to this control; it is not a global tag number shared with other BER elements The netscapeldapberstream package includes the classes listed in Table 16-1 for encoding basic data types Of these classes, the ones you are most likely to use in writing new controls are BERInteger, BEROctetString, BERBoolean, and BEREnumerated The classes listed in Table 16-2 provide the constructs for grouping and tagging the data elements The BERTag element always contains another element, which may be a basic type or another BERTag
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