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## org.modeshape.sequencer.ddl
Class DdlTokenStream

    java.lang.Object
      org.modeshape.common.text.TokenStream
          org.modeshape.sequencer.ddl.DdlTokenStream

    public class DdlTokenStream

extends TokenStream

A TokenStream implementation designed around requirements for tokenizing and parsing DDL statements.

Because of the complexity of DDL, it was necessary to extend `TokenStream` in order to override the basic tokenizer to tokenize the in-line comments prefixed with "--". In addition, because there is not a default ddl command (or statement) terminator, an override method was added to `TokenStream` to allow re-tokenizing the initial tokens to re-type the tokens, remove tokens, or any other operation to simplify parsing.

In this case, both reserved words (or key words) and statement start phrases can be registered prior to the `TokenStream` 's start() method. Any resulting tokens that match the registered string values will be re-typed to identify them as key words (DdlTokenizer.KEYWORD) or statement start phrases (DdlTokenizer.STATEMENT_KEY).

Nested Class Summary
`static class` | `DdlTokenStream.DdlTokenizer`

Nested classes/interfaces inherited from class org.modeshape.common.text.TokenStream
`TokenStream.BasicTokenizer, TokenStream.CaseInsensitiveToken, TokenStream.CaseInsensitiveTokenFactory, TokenStream.CaseSensitiveToken, TokenStream.CaseSensitiveTokenFactory, TokenStream.CharacterArrayStream, TokenStream.CharacterStream, TokenStream.Token, TokenStream.TokenFactory, TokenStream.Tokenizer, TokenStream.Tokens`

Field Summary
`protected Set<String>` | `registeredKeyWords`
`protected List<String[]>` | `registeredStatementStartPhrases`

Fields inherited from class org.modeshape.common.text.TokenStream
`ANY_TYPE, ANY_VALUE, inputString, inputUppercased`

Constructor Summary
`DdlTokenStream(String content, TokenStream.Tokenizer tokenizer, boolean caseSensitive)`

Method Summary
`static DdlTokenStream.DdlTokenizer` | `ddlTokenizer(boolean includeComments)` Obtain a ddl `DdlTokenStream.DdlTokenizer` implementation that ignores whitespace but includes tokens for individual symbols, the period ('.'), single-quoted strings, double-quoted strings, whitespace-delimited words, and optionally comments.
`String` | `getMarkedContent()` Returns the string content for characters bounded by the previous marked position and the position of the currentToken (inclusive).
`protected List<TokenStream.Token>` | `initializeTokens(List<TokenStream.Token> tokens)` Method to allow subclasses to preprocess the set of tokens and return the correct tokens to use.
`protected boolean` | `isKeyWord(String word)`
`boolean` | `isNextKeyWord()` Method to determine if the next token is of type `DdlTokenStream.DdlTokenizer` KEYWORD.
`boolean` | `isNextStatementStart()` Method to determine if next tokens match a registered statement start phrase.
`void` | `mark()` Marks the current position (line & column number) of the currentToken
`void` | `registerKeyWord(String keyWord)` Register a single key word.
`void` | `registerKeyWords(List<String> keyWords)` Register an `List` of key words.
`void` | `registerKeyWords(String[] keyWords)` Register an array of key words.
`void` | `registerStatementStartPhrase(String[] phrase)` Register a phrase representing the start of a DDL statement Examples would be: {"CREATE", "TABLE"} {"CREATE", "OR", "REPLACE", "VIEW"} see `DdlConstants` for the default SQL 92 representations.
`void` | `registerStatementStartPhrase(String[][] phrases)`

Methods inherited from class org.modeshape.common.text.TokenStream
`basicTokenizer, canConsume, canConsume, canConsume, canConsume, canConsume, canConsume, canConsumeAnyOf, canConsumeAnyOf, canConsumeAnyOf, canConsumeAnyOf, canConsumeAnyOf, consume, consume, consume, consume, consume, consume, consume, consumeBoolean, consumeInteger, consumeLong, getContentBetween, hasNext, matches, matches, matches, matches, matches, matches, matches, matches, matchesAnyOf, matchesAnyOf, matchesAnyOf, matchesAnyOf, matchesAnyOf, nextPosition, previousPosition, rewind, start, throwNoMoreContent, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### registeredStatementStartPhrases

    protected List<String[]> registeredStatementStartPhrases

### registeredKeyWords

    protected Set<String> registeredKeyWords

Constructor Detail

### DdlTokenStream

    public DdlTokenStream(String content,
                          TokenStream.Tokenizer tokenizer,
                          boolean caseSensitive)

Parameters:
  `content` -
  `tokenizer` -
  `caseSensitive` -

Method Detail

### initializeTokens

    protected List<TokenStream.Token> initializeTokens(List<TokenStream.Token> tokens)

  Method to allow subclasses to preprocess the set of tokens and return the correct tokens to use. The default behavior is to simply return the supplied tokens.

  Overrides:
    `initializeTokens` in class `TokenStream`
  Returns:
    list of tokens.
  See Also:
    `TokenStream.initializeTokens(java.util.List)`

### registerStatementStartPhrase

    public void registerStatementStartPhrase(String[] phrase)

  Register a phrase representing the start of a DDL statement

  Examples would be: {"CREATE", "TABLE"} {"CREATE", "OR", "REPLACE", "VIEW"}

  see `DdlConstants` for the default SQL 92 representations.

  Parameters:
    `phrase` -

### registerStatementStartPhrase

    public void registerStatementStartPhrase(String[][] phrases)

### registerKeyWord

    public void registerKeyWord(String keyWord)

  Register a single key word.

  Parameters:
    `keyWord` -

### registerKeyWords

    public void registerKeyWords(List<String> keyWords)

  Register an `List` of key words.

  Parameters:
    `keyWords` -

### registerKeyWords

    public void registerKeyWords(String[] keyWords)

  Register an array of key words.

  Parameters:
    `keyWords` -

### isKeyWord

    protected boolean isKeyWord(String word)

  Parameters:
    `word` -
  Returns:
    is Key Word

### isNextKeyWord

    public boolean isNextKeyWord()

  Method to determine if the next token is of type `DdlTokenStream.DdlTokenizer` KEYWORD.

  Returns:
    is Key Word

### isNextStatementStart

    public boolean isNextStatementStart()

  Method to determine if next tokens match a registered statement start phrase.

  Returns:
    true if next tokens match a registered statement start phrase

### mark

    public void mark()

  Marks the current position (line & column number) of the currentToken

### getMarkedContent

    public String getMarkedContent()

  Returns the string content for characters bounded by the previous marked position and the position of the currentToken (inclusive). Method also marks() the new position the the currentToken.

  Returns:
    the string content for characters bounded by the previous marked position and the position of the currentToken (inclusive).

### ddlTokenizer

    public static DdlTokenStream.DdlTokenizer ddlTokenizer(boolean includeComments)

  Obtain a ddl `DdlTokenStream.DdlTokenizer` implementation that ignores whitespace but includes tokens for individual symbols, the period ('.'), single-quoted strings, double-quoted strings, whitespace-delimited words, and optionally comments.

  Note that the resulting Tokenizer may not be appropriate in many situations, but is provided merely as a convenience for those situations that happen to be able to use it.

  Parameters:
    `includeComments` - true if the comments should be retained and be included in the token stream, or false if comments should be stripped and not included in the token stream
  Returns:
    the tokenizer; never null

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