TemplateParseUtil (Sakai Entity Broker API 21.0 API)

java.lang.Object
- org.sakaiproject.entitybroker.util.TemplateParseUtil

```
public class TemplateParseUtil
extends Object
```
Utility class to handle the URL template parsing (entity template parsing)

Author:

Aaron Zeckoski (aaron@caret.cam.ac.uk)

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`TemplateParseUtil.PreProcessedTemplate` Contains the data for templates, each template must have a template key and the template itself
`static class`	`TemplateParseUtil.ProcessedTemplate` Contains the processed template with the values from the processed input string that was determined to be related to this template
`static class`	`TemplateParseUtil.Template` Represents a parseable template (which is basically a key and the template string), the array which defines the set of template keys is `PARSE_TEMPLATE_KEYS` Rules for parse templates: 1) "{","}", and `SEPARATOR` are special characters and must be used as indicated only 2) Must begin with a `SEPARATOR`, must not end with a `SEPARATOR` 3) must begin with "/{prefix}" (use the `SEPARATOR` and `PREFIX` constants) 3) each {var} can only be used once in a template 4) {var} can never touch each other (i.e /{var1}{var2}/{id} is invalid) 5) each {var} can only have the chars from `VALID_VAR_CHARS` 6) parse templates can only have the chars from `VALID_TEMPLATE_CHARS` 7) Empty braces ({}) cannot appear in the template

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`BRACES`
`static Set<String>`	`commonExtensions` Contains a set of all the common extensions
`static List<TemplateParseUtil.PreProcessedTemplate>`	`defaultPreprocessedTemplates` Stores the preloaded processed default templates
`static List<TemplateParseUtil.Template>`	`defaultTemplates` Stores the preloaded default templates
`static String`	`DIRECT_PREFIX`
`static String`	`DIRECT_PREFIX_SLASH`
`static String`	`DOT_EXTENSION` The extension with a period in front marker (Example value: ".xml")
`static String`	`EXTENSION` The entity extension (format) marker (Example value: "xml")
`static String`	`ID` The entity ID marker (Example value: "123")
`static String[]`	`PARSE_TEMPLATE_KEYS` Defines the order that parse templates will be processed in and the set of parse template types (keys) which must be defined, the first one to match will be used when parsing in a path
`static char`	`PERIOD`
`static String`	`PREFIX` The entity prefix marker (Example value: "myprefix")
`static String`	`PREFIX_VARIABLE`
`static String`	`QUERY_STRING` The value in the query string (without a leading ?)
`static String`	`QUESTION_QUERY_STRING` The value in the query string (with a leading ?)
`static char`	`SEPARATOR`
`static String`	`TEMPLATE_DELETE` Defines the parse template for the "delete" operation, access the data to remove a record, typically /{prefix}/{id}/delete
`static String`	`TEMPLATE_EDIT` Defines the parse template for the "edit" operation, access the data to modify a record, typically /{prefix}/{id}/edit
`static String`	`TEMPLATE_LIST` Defines the parse template for the "list" operation, return a list of all records, typically /{prefix}
`static String`	`TEMPLATE_NEW` Defines the parse template for the "new" operation, return a form for creating a new record, typically /{prefix}/new
`static String`	`TEMPLATE_PREFIX`
`static String`	`TEMPLATE_SHOW` Defines the parse template for the "show" operation, access a record OR POST operations related to a record, typically /{prefix}/{id}
`static String`	`VALID_INPUT_CHARS` Defines the valid chars for a parser input (e.g. entity reference)
`static String`	`VALID_TEMPLATE_CHARS` Defines the valid chars for a template
`static String`	`VALID_TEMPLATE_CHARS_OUTGOING` Defines the valid template chars for an outgoing template (allows ?)
`static String`	`VALID_VAR_CHARS` Defines the valid chars for a replacement variable

Constructor Summary

Constructors
Constructor and Description

TemplateParseUtil()

Constructors
Constructor and Description
`TemplateParseUtil()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static String[]`	`findExtension(String input)` Find the extension from a string and return the string without the extension and the extension, an extension is a period (".") followed by any number of non-periods, the original input is returned as the 0th item in the array returned array contains 3 strings: 0 = the original input string 1 = the string without the extension or the original if it has none 2 = the extension OR null if there is no extension
`static String`	`getDefaultTemplate(String templateKey)` Get a default template for a specific template key
`static String`	`mergeTemplate(String template, Map<String,String> segments)` Takes a template and replaces the segment keys with the segment values, keys should not have {} around them yet as these will be added around each key in the segments map
`static TemplateParseUtil.ProcessedTemplate`	`parseTemplate(String input, List<TemplateParseUtil.PreProcessedTemplate> preprocessed)` Parse a string and attempt to match it to a template and then return the match information along with all the parsed out keys and values
`static TemplateParseUtil.PreProcessedTemplate`	`preprocessTemplate(TemplateParseUtil.Template t)` process a template into a preprocessed template which can be cached
`static List<TemplateParseUtil.PreProcessedTemplate>`	`preprocessTemplates(List<TemplateParseUtil.Template> templates)` Process the templates before attempting to match them, this is here so we can reduce the load of reprocessing the same templates over and over
`static String`	`validateOutgoingTemplate(String template)` Validates an outgoing template to make sure it is valid
`static void`	`validateTemplate(String template)` Validate a template, if invalid then an exception is thrown
`static void`	`validateTemplateKey(String templateKey)` Check if a templateKey is valid, if not then throws `IllegalArgumentException`

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

- Field Detail
  - SEPARATOR
```
public static final char SEPARATOR
```
    See Also:
    
    Constant Field Values
  - PERIOD
```
public static final char PERIOD
```
    See Also:
    
    Constant Field Values
  - BRACES
```
public static final String BRACES
```
    See Also:
    
    Constant Field Values
  - PREFIX
```
public static final String PREFIX
```
    The entity prefix marker (Example value: "myprefix")
    
    See Also:
    
    Constant Field Values
  - ID
```
public static final String ID
```
    The entity ID marker (Example value: "123")
    
    See Also:
    
    Constant Field Values
  - EXTENSION
```
public static final String EXTENSION
```
    The entity extension (format) marker (Example value: "xml")
    
    See Also:
    
    Constant Field Values
  - DOT_EXTENSION
```
public static final String DOT_EXTENSION
```
    The extension with a period in front marker (Example value: ".xml")
    
    See Also:
    
    Constant Field Values
  - QUERY_STRING
```
public static final String QUERY_STRING
```
    The value in the query string (without a leading ?), '' if non available (Example value: "auto=true")
    
    See Also:
    
    Constant Field Values
  - QUESTION_QUERY_STRING
```
public static final String QUESTION_QUERY_STRING
```
    The value in the query string (with a leading ?), '' if non available (Example value: "?auto=true")
    
    See Also:
    
    Constant Field Values
  - PREFIX_VARIABLE
```
public static final String PREFIX_VARIABLE
```
    See Also:
    
    Constant Field Values
  - TEMPLATE_PREFIX
```
public static final String TEMPLATE_PREFIX
```
    See Also:
    
    Constant Field Values
  - DIRECT_PREFIX
```
public static final String DIRECT_PREFIX
```
    See Also:
    
    Constant Field Values
  - DIRECT_PREFIX_SLASH
```
public static final String DIRECT_PREFIX_SLASH
```
    See Also:
    
    Constant Field Values
  - VALID_VAR_CHARS
```
public static final String VALID_VAR_CHARS
```
    Defines the valid chars for a replacement variable
    
    See Also:
    
    Constant Field Values
  - VALID_INPUT_CHARS
```
public static final String VALID_INPUT_CHARS
```
    Defines the valid chars for a parser input (e.g. entity reference)
    
    See Also:
    
    Constant Field Values
  - VALID_TEMPLATE_CHARS
```
public static final String VALID_TEMPLATE_CHARS
```
    Defines the valid chars for a template
    
    See Also:
    
    Constant Field Values
  - VALID_TEMPLATE_CHARS_OUTGOING
```
public static final String VALID_TEMPLATE_CHARS_OUTGOING
```
    Defines the valid template chars for an outgoing template (allows ?)
    
    See Also:
    
    Constant Field Values
  - TEMPLATE_LIST
```
public static final String TEMPLATE_LIST
```
    Defines the parse template for the "list" operation, return a list of all records, typically /{prefix}
    
    See Also:
    
    Constant Field Values
  - TEMPLATE_SHOW
```
public static final String TEMPLATE_SHOW
```
    Defines the parse template for the "show" operation, access a record OR POST operations related to a record, typically /{prefix}/{id}
    
    See Also:
    
    Constant Field Values
  - TEMPLATE_NEW
```
public static final String TEMPLATE_NEW
```
    Defines the parse template for the "new" operation, return a form for creating a new record, typically /{prefix}/new
    
    See Also:
    
    Constant Field Values
  - TEMPLATE_EDIT
```
public static final String TEMPLATE_EDIT
```
    Defines the parse template for the "edit" operation, access the data to modify a record, typically /{prefix}/{id}/edit
    
    See Also:
    
    Constant Field Values
  - TEMPLATE_DELETE
```
public static final String TEMPLATE_DELETE
```
    Defines the parse template for the "delete" operation, access the data to remove a record, typically /{prefix}/{id}/delete
    
    See Also:
    
    Constant Field Values
  - PARSE_TEMPLATE_KEYS
```
public static final String[] PARSE_TEMPLATE_KEYS
```
    Defines the order that parse templates will be processed in and the set of parse template types (keys) which must be defined, the first one to match will be used when parsing in a path
  - defaultTemplates
```
public static final List<TemplateParseUtil.Template> defaultTemplates
```
    Stores the preloaded default templates
  - defaultPreprocessedTemplates
```
public static final List<TemplateParseUtil.PreProcessedTemplate> defaultPreprocessedTemplates
```
    Stores the preloaded processed default templates
  - commonExtensions
```
public static Set<String> commonExtensions
```
    Contains a set of all the common extensions
- Constructor Detail
  - TemplateParseUtil
```
public TemplateParseUtil()
```
- Method Detail
  - validateTemplateKey
```
public static void validateTemplateKey(String templateKey)
```
    Check if a templateKey is valid, if not then throws IllegalArgumentException
    
    Parameters:
    
    templateKey - a key from the set of template keys PARSE_TEMPLATE_KEYS
  - getDefaultTemplate
```
public static String getDefaultTemplate(String templateKey)
```
    Get a default template for a specific template key
    
    Parameters:
    
    templateKey - a key from the set of template keys PARSE_TEMPLATE_KEYS
    
    Returns:
    
    the template
    
    Throws:
    
    IllegalArgumentException - if the template key is invalid
  - validateTemplate
```
public static void validateTemplate(String template)
```
    Validate a template, if invalid then an exception is thrown
    
    Parameters:
    
    template - a parse template
  - validateOutgoingTemplate
```
public static String validateOutgoingTemplate(String template)
```
    Validates an outgoing template to make sure it is valid
    
    Parameters:
    
    template - an outgoing template, if starts with / then it will be used as is and redirected to, otherwise it will have the direct URL prefixed and will be forwarded
    
    Returns:
    
    the template which should be completely valid
  - mergeTemplate
```
public static String mergeTemplate(String template,
                                   Map<String,String> segments)
```
    Takes a template and replaces the segment keys with the segment values, keys should not have {} around them yet as these will be added around each key in the segments map
    
    Parameters:
    
    template - a parse template with {variables} in it
    
    segments - a map of all possible segment keys and values, unused keys will be ignored
    
    Returns:
    
    the template with replacement values filled in
    
    Throws:
    
    IllegalArgumentException - if all template variables cannot be replaced or template is empty/null
  - findExtension
```
public static String[] findExtension(String input)
```
    Find the extension from a string and return the string without the extension and the extension, an extension is a period (".") followed by any number of non-periods, the original input is returned as the 0th item in the array
    returned array contains 3 strings:
    0 = the original input string
    1 = the string without the extension or the original if it has none
    2 = the extension OR null if there is no extension
    
    Parameters:
    
    input - any string
    
    Returns:
    
    an array with the string without the extension or the original if it has none in position 1 and the extension in the position 2 (or null if no extension), position 0 holds the original input string
  - parseTemplate
```
public static TemplateParseUtil.ProcessedTemplate parseTemplate(String input,
                                                                List<TemplateParseUtil.PreProcessedTemplate> preprocessed)
```
    Parse a string and attempt to match it to a template and then return the match information along with all the parsed out keys and values
    
    Parameters:
    
    input - a string which we want to attempt to match to one of the templates
    
    preprocessed - the analyzed templates to attempt to match in the order they should attempt the match, can be a single template or multiples, use preprocessTemplates(List) to create this (recommend caching the preprocessed templates to avoid reprocessing them over and over)
    
    Returns:
    
    a the processed template analysis object OR null if no matches
  - preprocessTemplates
```
public static List<TemplateParseUtil.PreProcessedTemplate> preprocessTemplates(List<TemplateParseUtil.Template> templates)
```
    Process the templates before attempting to match them, this is here so we can reduce the load of reprocessing the same templates over and over
    
    Parameters:
    
    templates - the templates to attempt to preprocess, can be a single template or multiples
    
    Returns:
    
    the list of preprocessed templates (in the same order as input)
  - preprocessTemplate
```
public static TemplateParseUtil.PreProcessedTemplate preprocessTemplate(TemplateParseUtil.Template t)
```
    process a template into a preprocessed template which can be cached
    
    Parameters:
    
    t - the template
    
    Returns:
    
    the preprocessed template

Class TemplateParseUtil

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SEPARATOR

PERIOD

BRACES

PREFIX

ID

EXTENSION

DOT_EXTENSION

QUERY_STRING

QUESTION_QUERY_STRING

PREFIX_VARIABLE

TEMPLATE_PREFIX

DIRECT_PREFIX

DIRECT_PREFIX_SLASH

VALID_VAR_CHARS

VALID_INPUT_CHARS

VALID_TEMPLATE_CHARS

VALID_TEMPLATE_CHARS_OUTGOING

TEMPLATE_LIST

TEMPLATE_SHOW

TEMPLATE_NEW

TEMPLATE_EDIT

TEMPLATE_DELETE

PARSE_TEMPLATE_KEYS

defaultTemplates

defaultPreprocessedTemplates

commonExtensions

Constructor Detail

TemplateParseUtil

Method Detail

validateTemplateKey

getDefaultTemplate

validateTemplate

validateOutgoingTemplate

mergeTemplate

findExtension

parseTemplate

preprocessTemplates

preprocessTemplate