Class FileLoader

java.lang.Object
io.pebbletemplates.pebble.loader.FileLoader
All Implemented Interfaces:
Loader<String>

public class FileLoader extends Object implements Loader<String>
This loader searches for a file located anywhere on the filesystem. It uses java.io.File to perform the lookup.
  • Field Details

    • logger

      private static final org.slf4j.Logger logger
    • prefix

      private String prefix
    • suffix

      private String suffix
    • charset

      private String charset
  • Constructor Details

    • FileLoader

      public FileLoader()
  • Method Details

    • getReader

      public Reader getReader(String templateName)
      Description copied from interface: Loader
      The reader which will be used by Pebble to read the contents of the template.
      Specified by:
      getReader in interface Loader<String>
      Parameters:
      templateName - the cache key to use to load create the reader.
      Returns:
      A reader object
    • getFile

      private File getFile(String templateName)
    • getSuffix

      public String getSuffix()
    • setSuffix

      public void setSuffix(String suffix)
      Description copied from interface: Loader
      Optional suffix to help find templates, ex ".html", ".peb"
      Specified by:
      setSuffix in interface Loader<String>
      Parameters:
      suffix - Suffix to attach to template names
    • getPrefix

      public String getPrefix()
    • setPrefix

      public void setPrefix(String prefix)
      Description copied from interface: Loader
      Optional prefix to help find templates, ex "/WEB-INF/templates/" or "database_schema."
      Specified by:
      setPrefix in interface Loader<String>
      Parameters:
      prefix - Prefix to help find templates
    • getCharset

      public String getCharset()
    • setCharset

      public void setCharset(String charset)
      Description copied from interface: Loader
      A method for end users to change the charset used by the loader.
      Specified by:
      setCharset in interface Loader<String>
      Parameters:
      charset - Character set used by the loader when building a reader object
    • resolveRelativePath

      public String resolveRelativePath(String relativePath, String anchorPath)
      Description copied from interface: Loader
      Resolves the given relativePath based on the given anchorPath.

      A path is considered as relative when it starts either with '..' or '.' and followed either by a '/' or '\\' otherwise the assumption is that the provided path is an absolute path.

      Specified by:
      resolveRelativePath in interface Loader<String>
      Parameters:
      relativePath - the relative path which should be resolved.
      anchorPath - the anchor path based on which the relative path should be resolved on.
      Returns:
      the resolved path or null when the path could not be resolved.
    • createCacheKey

      public String createCacheKey(String templateName)
      Description copied from interface: Loader
      This method resolves the given template name to a unique object which can be used as the key within the PebbleEngine.getTemplateCache(). The returned object will be passed with Loader.getReader(Object).

      The resolve method can eventually add information to the cache key from the context (e.g. user session information, servlet request etc.).

      As a concrete example if the loader loads a template created by a user form the database the template name itself is not uniquely identify the template. The identification of the template requires also the user which created the template. Hence for the key the user id and the template name should be used. So the cache key is enhanced by some contextual information.

      The implementor of the method can add as many additional contextual information to the returned object. However the following things needs to be considered:

      • This method will be called on each PebbleEngine.getTemplate(String). Hence the implementation needs to be fast and eventually use some caching for the lookup process.
      • The returned object is used within a cache and hence needs to implement Object.equals(Object) and Object.hashCode().
      • The object is kept in memory and hence it should not be to memory heavy.

      Depending on this implementation the PebbleEngine.getTemplateCache() should be tuned in a way it can operate optimal. E.g. when the number of potential templates is infinite the cache should evict some templates at some point in time otherwise the stability of the memory is not given anymore.

      Specified by:
      createCacheKey in interface Loader<String>
      Parameters:
      templateName - The name of the template
      Returns:
      Returns the cache key
    • resourceExists

      public boolean resourceExists(String templateName)
      Specified by:
      resourceExists in interface Loader<String>