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An add operation will fail if the entry already exists (that is, if the DN exists) To avoid this situation you can execute the add method, and if an exception of LDAPExceptionENTRY_ALREADY_EXISTS is caught, then use a modify Modify is for changing values in the directory for entries that already exist; it will be covered in the next section If the duplicate entry is an error condition and you do not want to overwrite an existing entry, then you can handle the exception in some other way, such as reporting an error and aborting You will need to identify and process other exception types as well, in particular LDAPExceptionINSUFFICIENT_ACCESS_RIGHTS

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(short)0x12345678==0x5678 (byte)255==-1 (int)1e20f==2147483647 (int)NaN==0 (float)-1e100==-Infinity (float)1e-50==00

Whenever we parsed an empty block we returned 0 to the parser s results list; whenever we parsed new rows we returned the number of rows; and whenever we encountered a node_data, we created a Block to represent it In the case of Blocks they always have an empty child list (ie, the children attribute is set to []), since at this point we don t know if the block will have children or not So here the outer list represents the root block, the 0s represent empty blocks, the other integers (all 2s in this case) represent new rows, and the []s are empty child lists since none of the hierarchyblk le s blocks contain other blocks

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The preceding section outlined the steps necessary to add a new entry to the directory This section will focus on altering entries that are already in the directory To modify a single attribute of an entry, we use an LDAPModification object We modify multiple attributes by using an LDAPModificationSet Once the LDAPModification object has been built, the changes are written back via the modify method of LDAPConnection

514 Widening and Narrowing Primitive Conversions The following conversion combines both widening and narrowing primitive convesions:

The messageboxblk example s items list (pretty printed to reveal its structure, and again using Block for clarity) is:

// A NaN converted to int yields zero: Systemoutprintln("(int)NaN==" + (int)FloatNaN);

[Block, [Block, [0, Block, [], 2, Block, [], 0, Block, [], 1, 0] ] ]

Modifying an attribute value can include adding a new value, changing a value, and/ or removing a value After a brief look at the general procedure for modifying an entry, we will examine each of these cases

// A double value too large for float yields in nity: Systemoutprintln("(float)-1e100==" + (float)-1e100); // A double value too small for float under ows to zero: Systemoutprintln("(float)1e-50==" + (float)1e-50);

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Here we can see that the outer list (representing the root block) contains a block that has a child list of one block that contains its own child list, and where these children are blocks (with their own empty child lists), new rows (2 and 1), and empty blocks (0s) One problem with the list results representation is that every Block s children list is empty each block s children are in a list that follows the block in the parser s results list We need to convert this structure into a single root block with child blocks To this end we have created a stack a list containing a single root Block We then call the populate_children() function that takes the list of items returned by the parser and a list with a root block, and populates the root block s children (and their children, and so on, as appropriate) with the items

Modifying an entry in the directory requires the following steps: 1 Instantiate an LDAPAttribute object for each attribute you want to modify 2 Instantiate an LDAPModificationSet object and use the add method, specifying LDAPModificationADD, REPLACE, or DELETE for each LDAPAttribute object from step 1, or construct a single LDAPModification if only one attribute is to be updated 3 Call the LDAPConnectionmodify method with the DN and the LDAPModificationSet or LDAPModification object from step 2

class Test { public static void main(String[] args) { // A narrowing of int to short loses high bits: Systemoutprintln("(short)0x12345678==0x" + IntegertoHexString((short)0x12345678));

Pythonic Parsing with PyParsing The populate_children() function is quite short, but also rather subtle

A value may be added to an attribute, making the attribute a multivalued attribute Attributes such as telephoneNumber are de ned in the schema as multivalued and can therefore have multiple values The following code snippet adds an additional e-mail address for an entry This code will add a mail attribute to the indicated entry if the attribute does not already exist If the attribute does exist, the new value is appended to the existing values

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