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%w(1 2 3 4 5 6 7)in_groups(3, false) {|group| p group} ["1", "2", "3"] ["4", "5"] ["6", "7"]

In this section, we will not delve into the intricacies of working with JPA Rather, we concentrate on the speci cs of using JPA with SCA, and in particular stateless services, transaction policy, and conversational interactions

in groups of(number, fill with = nil) {|group| }

IF LPAREN ID(ret) RPAREN ID(mat) LBRACKET ID(x) RBRACKET LBRACKET ID(y) RBRACKET EQUAL ID(END_VAL) SEMI

Related to its sibling in_groups, the in_groups_of method splits an array into groups of the specified number size, padding any remaining slots The fill_with parameter is used for padding and defaults to nil If a block is provided, it is called with each group; otherwise, a two-dimensional array is returned

>> %w(1 2 3 4 5 6 7)in_groups_of(3) => [[1, 2, 3], [4, 5, 6], [7, nil, nil] >> %w(1 2 3)in_groups_of(2, ' ') {|group| puts group } => [[1, 2],[3, " "]]

>> %w(1 2 3)in_groups_of(2, false) {|group| puts group } => [[1, 2][3]]

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Notice that most tokens are represented entirely by their token type, but to be useful, the ID token requires an additional piece of information: the name of the identi er To enable useful error reporting later, tokens should carry at least one other kind of information with them: their position in the source text (usually a line number and a column number) For the simplest of static analysis tools, the job is nearly nished at this point If all the tool is going to do is match the names of dangerous functions, the analyzer can go through the token stream looking for identi ers,

This chapter assumes basic familiarity with JPA or an Object/Relational Mapping (O/R) tool such as Hibernate (wwwhibernateorg) If you are not familiar with JPA or want to learn more, we highly recommend the very thorough book by Christian Bauer and Gavin King, Java Persistence with Hibernate (Manning, 2006)

The in_groups_of method is particularly useful for batch-processing model objects and generating table rows in view templates

split(value = nil, &block)

match them against a list of dangerous function names, and report the results This is the approach taken by ITS4, RATS, and Flaw nder

Divides an array into one or more subarrays based on a delimiting value:

[1, 2, 3, 4, 5]split(3) #=> [[1, 2], [4, 5]]

if ( ) [ ] = ; /[ \t\n]+/ /\/\/*/ /[a-zA-Z][a-zA-Z0-9]*"/ { { { { { { { { { { return IF; } return LPAREN; } return RPAREN; } return LBRACKET; } return LBRACKET; } return EQUAL; } return SEMI; } /* ignore whitespace */ } /* ignore comments */ } return ID; }

or the result of an optional block:

The Basics: Object Lifecycles and the Persistence Context In JPA, an object that is persisted to a database such as a Loan Application is referred to as an entity The EntityManager API provides operations for querying, saving, updating, and deleting entities Similar to a DataSource, an EntityManager is injected on a component instance However, instead of using the @Resource annotation, the @PersistenceContext annotation from the javaxpersistence package is used (Why it is called PersistenceContext will become apparent later) Listing 116 demonstrates how the LoanComponent uses an EntityManager to persist a new LoanApplication, resulting in a database insert

(18)to_asplit { |i| i % 3 == 0 } # => [[1, 2], [4, 5], [7, 8]]

B15 active support/core ext/array/

Parsing A language parser uses a context-free grammar (CFG) to match the token stream The grammar consists of a set of productions that describe the symbols (elements) in the language Example 42 lists a set of productions that are capable of parsing the sample token stream (Note that the de nitions for these productions would be much more involved for a full-blown language parser)

Efficiently grabbing a random record from the database is covered under the heading, Random Ordering in 5, Working with Active Record

Returns an unique array based on the criteria given as a proc Can be used when you need to enhance or decorate Ruby s default uniq behavior

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