Package org.apache.tapestry5.services

# Interface PersistentFieldBundle

All Known Implementing Classes:
  `PersistentFieldBundleImpl`

public interface PersistentFieldBundle
Encapsulates persisted property information for an entire page.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `containsValue(String componentId, String fieldName)`
  Checks to see if a persistent value has been stored for the indicated component and field.
  `Object`
  `getValue(String componentId, String fieldName)`

- ## Method Details

  - ### containsValue

    boolean containsValue(String componentId, String fieldName)
    Checks to see if a persistent value has been stored for the indicated component and field. TODO: This method can probably be removed; it doesn't look like its used (instead, we if check getValue() returns null).
    Parameters:
      `componentId` - the nested id of the component (within the page), may be null or blank for the root component of the page
      `fieldName` - the name of the field whose value was persisted
    Returns:
      true if a change has been stored

  - ### getValue

    Object getValue(String componentId, String fieldName)
    Parameters:
      `componentId` - the nested if of the component (within the page), may be null or blank for the root component of the page
      `fieldName` - the name of the field whose value was persisted
    Returns:
      the persisted value, possibly null