Feed

java.lang.Object
- com.google.gdata.model.Element
- - com.google.gdata.model.atom.Source
  - - com.google.gdata.model.atom.Feed

All Implemented Interfaces:

IAtom, IFeed

Direct Known Subclasses:

EventFeed, MessageFeed
```
public class Feed
extends Source
implements IFeed
```
The Feed class is a base class that represents a generic GData feed object, based primarily on the data model for an <atom:feed> element. It is extended to represent OpenSearch RSS channel elements and other gdata standard elements.
The Feed Class contains all the necessary parsing and generation code for feed data, but can be subclassed to create subtypes that contain convenience APIs for accessing additional elements and entries.
An instance can be initialized by directly initializing its component elements.
Here is the Relax-NG schema that represents an Atom 1.0 feed:
```
 AtomFeed =
  element atom:feed {
    atomCommonAttributes,
    (atomAuthor*
     atomCategory*
     atomContributor*
     atomGenerator?
     atomIcon?
     atomId
     atomLink*
     atomLogo?
     atomRights?
     atomSubtitle?
     atomTitle
     atomUpdated
     extensionElement*),
     atomEntry*
   }
 
```
Because the Feed schema differs from the Source schema only by the presence of the entries, the Feed class derives its base property model from the Source class.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`protected static class`	`Feed.FeedState` The FeedState class provides a simple structure that encapsulates the attributes of an Atom feed that should be shared with a shallow copy if the feed is adapted to a more specific Feed subtypes.

Nested classes/interfaces inherited from class com.google.gdata.model.atom.Source
Source.Generator

Field Summary

Fields
Modifier and Type	Field and Description
`protected Feed.FeedState`	`feedState` Basic state for this feed.
`static ElementKey<java.lang.Integer,Element>`	`ITEMS_PER_PAGE` The opensearch:itemsPerPage element.
`static ElementKey<java.lang.Void,Feed>`	`KEY` The key for this element.
`static ElementKey<java.lang.Integer,Element>`	`START_INDEX` The opensearch:startIndex element.
`static ElementKey<java.lang.Integer,Element>`	`TOTAL_RESULTS` The opensearch:totalResults element.
`static AttributeKey<java.net.URI>`	`XML_BASE` The xml:base attribute.

Fields inherited from class com.google.gdata.model.atom.Source
CONSTRUCT, ICON, ID, LOGO, RIGHTS, SUBTITLE, TITLE, UPDATED

Constructor Summary

Constructors
Modifier	Constructor and Description
	`Feed()` Constructs a new Feed instance, using default metadata.
`protected`	`Feed(ElementKey<?,? extends Feed> key)` Creates a new feed instance using the specified metadata.
`protected`	`Feed(ElementKey<?,? extends Feed> key, Feed source)` Copy constructor that initializes a new Feed instance to have identical contents to another instance, using a shared reference to the same `Feed.FeedState`.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addEntry(Entry entry)` Adds an entry to this feed.
`void`	`clearEntries()` Clears the list of entries on this feed.
`Entry`	`createEntry()` Creates a new entry for the feed.
`<E extends Entry> E`	`createEntry(ElementKey<?,E> entryKey)` Creates a new entry for the feed.
`boolean`	`getCanPost()` Gets the property that indicates if it is possible to post new entries to the feed.
`java.util.List<? extends Entry>`	`getEntries()` Returns the list of entries in this feed
`<T extends Entry> java.util.List<T>`	`getEntries(java.lang.Class<T> returnClass)` Gets a list of entries of a particular kind.
`protected <T extends Entry> java.util.List<T>`	`getEntries(ElementKey<?,T> key)` Returns a list of entries matching the given entry key.
`Link`	`getEntryPostLink()` Returns the entry post link for the feed.
`java.lang.String`	`getEtag()` Returns the `GdAttributes.ETAG` value for this feed.
`Link`	`getFeedBatchLink()` Returns the link that provides the URI that can be used to batch operations to query, insert, update and delete entries on this feed.
`int`	`getItemsPerPage()` Gets the number of items that will be returned per page for paged feeds.
`java.lang.String`	`getKind()` Returns the `GdAttributes.KIND` value for this feed.
`Link`	`getNextLink()` Returns the link that provides the URI of next page in a paged feed.
`Link`	`getPreviousLink()` Returns the link that provides the URI of previous page in a paged feed.
`java.lang.String`	`getSelectedFields()` Returns the `GdAttributes.FIELDS` value for this feed.
`Feed`	`getSelf()` Returns the current representation of the feed by requesting it from the associated service using the feed's self link.
`Link`	`getSelfLink()` Returns the self link for the feed.
`Service`	`getService()` Returns that GData `Service` instance tassociated with this feed.
`int`	`getStartIndex()` Gets the starting index of the contained entries for paged feeds.
`int`	`getTotalResults()` Gets the total number of results associated with this feed.
`java.lang.String`	`getVersionId()` Returns the resource version id for this feed.
`java.net.URI`	`getXmlBase()` Returns the current xml:base attribute for this feed.
`<T extends Entry> T`	`insert(T newEntry)` Inserts a new Entry into the feed, if the feed is currently associated with a Service.
`protected Element`	`narrow(ElementMetadata<?,?> meta, ValidationContext vc)` Narrows this feed using categories with an appropriate kind value.
`static void`	`registerMetadata(MetadataRegistry registry)` Registers the metadata for this element.
`boolean`	`removeEntry(Entry entry)` Removes a single entry from this feed.
`void`	`removeLinks()` Removes all links.
`Element`	`resolve(ElementMetadata<?,?> metadata, ValidationContext vc)` Resolve this element's state against the metadata.
`void`	`setCanPost(boolean v)` Sets the property that indicates if it is possible to post new entries to the feed.
`void`	`setEntries(java.util.Collection<? extends Entry> entries)` Sets the entries in this feed to the given entries.
`void`	`setEtag(java.lang.String v)` Sets the `GdAttributes.ETAG` value for this feed.
`void`	`setItemsPerPage(int v)` Sets the number of items that will be returned per page for paged feeds.
`void`	`setKind(java.lang.String v)` Sets the `GdAttributes.KIND` value for this feed.
`void`	`setSelectedFields(java.lang.String v)` Sets the`GdAttributes.FIELDS` value for this feed.
`void`	`setService(Service v)` Sets that GData `Service` instance associated with this feed.
`void`	`setStartIndex(int v)` Sets the starting index of the contained entries for paged feeds.
`void`	`setTotalResults(int v)` Sets the total number of results associated with this feed.
`void`	`setVersionId(java.lang.String v)` Set the resource version id for this feed.
`void`	`setXmlBase(java.net.URI v)` Sets the current xml:base attribute for this feed.

Methods inherited from class com.google.gdata.model.atom.Source
addAuthor, addAuthors, addCategory, addContributor, addContributors, addHtmlLink, addLink, addLink, clearAuthors, clearCategories, clearContributors, clearLinks, getAuthors, getCategories, getContributors, getGenerator, getHtmlLink, getIcon, getIconUri, getId, getLink, getLinks, getLinks, getLogo, getLogoUri, getRights, getSubtitle, getTitle, getUpdated, removeAuthor, removeContributor, removeLink, removeLinks, setGenerator, setGenerator, setIcon, setIcon, setId, setLogo, setLogo, setRights, setSubtitle, setTitle, setUpdated

Methods inherited from class com.google.gdata.model.Element
adapt, adapt, addElement, addElement, addElement, clear, createElement, createElement, eq, equals, getAttributeCount, getAttributeIterator, getAttributeIterator, getAttributeValue, getAttributeValue, getDefaultKey, getElement, getElement, getElementCount, getElementId, getElementIterator, getElementIterator, getElementKey, getElements, getElements, getElementSet, getElementSet, getElementValue, getElementValue, getTextValue, getTextValue, hasAttribute, hasAttribute, hasElement, hasElement, hashCode, hasTextValue, isLocked, lock, removeAttribute, removeAttribute, removeAttributeValue, removeAttributeValue, removeElement, removeElement, removeElement, removeElement, replaceElement, resolve, sameClassAs, setAttributeValue, setAttributeValue, setElement, setElement, setElement, setTextValue, toString, validate, visit

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

Methods inherited from interface com.google.gdata.data.IFeed
getGenerator, getLogo, getSubtitle, setGenerator, setLogo

Methods inherited from interface com.google.gdata.data.IAtom
addLink, getAuthors, getCategories, getId, getLink, getLinks, getTitle, getUpdated, removeLinks, setId, setUpdated

- Field Detail
  - KEY
```
public static final ElementKey<java.lang.Void,Feed> KEY
```
    The key for this element.
  - XML_BASE
```
public static final AttributeKey<java.net.URI> XML_BASE
```
    The xml:base attribute.
  - ITEMS_PER_PAGE
```
public static final ElementKey<java.lang.Integer,Element> ITEMS_PER_PAGE
```
    The opensearch:itemsPerPage element.
  - START_INDEX
```
public static final ElementKey<java.lang.Integer,Element> START_INDEX
```
    The opensearch:startIndex element.
  - TOTAL_RESULTS
```
public static final ElementKey<java.lang.Integer,Element> TOTAL_RESULTS
```
    The opensearch:totalResults element.
  - feedState
```
protected final Feed.FeedState feedState
```
    Basic state for this feed. May be shared across multiple adapted instances associated with the same logical feed.
- Constructor Detail
  - Feed
```
public Feed()
```
    Constructs a new Feed instance, using default metadata.
  - Feed
```
protected Feed(ElementKey<?,? extends Feed> key)
```
    Creates a new feed instance using the specified metadata.
    
    Parameters:
    key - the feed key.
  - Feed
```
protected Feed(ElementKey<?,? extends Feed> key,
    Feed source)
```
    Copy constructor that initializes a new Feed instance to have identical contents to another instance, using a shared reference to the same Feed.FeedState. Subclasses of Feed can use this constructor to create adaptor instances of a feed that share state with the original but use a different set of metadata.
- Method Detail
  - registerMetadata
```
public static void registerMetadata(MetadataRegistry registry)
```
    Registers the metadata for this element.
  - getService
```
public Service getService()
```
    Returns that GData Service instance tassociated with this feed.
  - setService
```
public void setService(Service v)
```
    Sets that GData Service instance associated with this feed.
    
    Specified by:
    
    setService in interface IAtom
  - getCanPost
```
public boolean getCanPost()
```
    Gets the property that indicates if it is possible to post new entries to the feed.
    
    Specified by:
    
    getCanPost in interface IFeed
  - setCanPost
```
public void setCanPost(boolean v)
```
    Sets the property that indicates if it is possible to post new entries to the feed.
    
    Specified by:
    
    setCanPost in interface IFeed
  - getVersionId
```
public java.lang.String getVersionId()
```
    Returns the resource version id for this feed. This will be used to generate an etag value on output. This is never set when the Feed has been parsed.
    
    Specified by:
    
    getVersionId in interface IAtom
  - setVersionId
```
public void setVersionId(java.lang.String v)
```
    Set the resource version id for this feed. This will be used to generate an etag value on output. If null, the updated time will be used instead to generate an etag.
    
    Specified by:
    
    setVersionId in interface IAtom
  - getEtag
```
public java.lang.String getEtag()
```
    Returns the GdAttributes.ETAG value for this feed. A value of null indicates the value is unknown.
    
    Specified by:
    
    getEtag in interface IAtom
  - setEtag
```
public void setEtag(java.lang.String v)
```
    Sets the GdAttributes.ETAG value for this feed. A value of null indicates the value is unknown.
    
    Specified by:
    
    setEtag in interface IAtom
  - getKind
```
public java.lang.String getKind()
```
    Returns the GdAttributes.KIND value for this feed. The kind attribute may be null if this feed does not have a kind.
    
    Specified by:
    
    getKind in interface IAtom
  - setKind
```
public void setKind(java.lang.String v)
```
    Sets the GdAttributes.KIND value for this feed. The kind may be set to null to remove the attribute value.
    
    Specified by:
    
    setKind in interface IAtom
  - getSelectedFields
```
public java.lang.String getSelectedFields()
```
    Returns the GdAttributes.FIELDS value for this feed. The fields attribute may be null if this feed contains a full representation.
  - setSelectedFields
```
public void setSelectedFields(java.lang.String v)
```
    Sets theGdAttributes.FIELDS value for this feed. The fields attribute may be set to null to remove the attribute value.
  - getXmlBase
```
public java.net.URI getXmlBase()
```
    Returns the current xml:base attribute for this feed. The base attribute may be null if this feed does not have an xml:base.
  - setXmlBase
```
public void setXmlBase(java.net.URI v)
```
    Sets the current xml:base attribute for this feed. The base may be set to null to remove the attribute value.
  - getTotalResults
```
public int getTotalResults()
```
    Gets the total number of results associated with this feed. The value may be larger than the number of contained entries for paged feeds. A value of Query.UNDEFINED indicates the total size is undefined.
    
    Specified by:
    
    getTotalResults in interface IFeed
  - setTotalResults
```
public void setTotalResults(int v)
```
    Sets the total number of results associated with this feed. The value may be larger than the number of contained entries for paged feeds. A value of Query.UNDEFINED indicates the total size is undefined.
    
    Specified by:
    
    setTotalResults in interface IFeed
  - getStartIndex
```
public int getStartIndex()
```
    Gets the starting index of the contained entries for paged feeds. A value of Query.UNDEFINED indicates the start index is undefined.
    
    Specified by:
    
    getStartIndex in interface IFeed
  - setStartIndex
```
public void setStartIndex(int v)
```
    Sets the starting index of the contained entries for paged feeds. A value of Query.UNDEFINED indicates the start index is undefined.
    
    Specified by:
    
    setStartIndex in interface IFeed
  - getItemsPerPage
```
public int getItemsPerPage()
```
    Gets the number of items that will be returned per page for paged feeds. A value of Query.UNDEFINED indicates the page item count is undefined.
    
    Specified by:
    
    getItemsPerPage in interface IFeed
  - setItemsPerPage
```
public void setItemsPerPage(int v)
```
    Sets the number of items that will be returned per page for paged feeds. A value of Query.UNDEFINED indicates the page item count is undefined.
    
    Specified by:
    
    setItemsPerPage in interface IFeed
  - getEntries
```
public java.util.List<? extends Entry> getEntries()
```
    Returns the list of entries in this feed
    
    Specified by:
    
    getEntries in interface IFeed
  - getEntries
```
protected <T extends Entry> java.util.List<T> getEntries(ElementKey<?,T> key)
```
    Returns a list of entries matching the given entry key.
  - setEntries
```
public void setEntries(java.util.Collection<? extends Entry> entries)
```
    Sets the entries in this feed to the given entries.
  - clearEntries
```
public void clearEntries()
```
    Clears the list of entries on this feed.
  - addEntry
```
public void addEntry(Entry entry)
```
    Adds an entry to this feed.
  - removeEntry
```
public boolean removeEntry(Entry entry)
```
    Removes a single entry from this feed.
  - createEntry
```
public Entry createEntry()
```
    Creates a new entry for the feed.
    
    Specified by:
    
    createEntry in interface IFeed
  - createEntry
```
public <E extends Entry> E createEntry(ElementKey<?,E> entryKey)
```
    Creates a new entry for the feed.
  - getEntryPostLink
```
public Link getEntryPostLink()
```
    Returns the entry post link for the feed.
    
    Specified by:
    
    getEntryPostLink in interface IFeed
  - getSelfLink
```
public Link getSelfLink()
```
    Returns the self link for the feed.
    
    Specified by:
    
    getSelfLink in interface IAtom
  - getNextLink
```
public Link getNextLink()
```
    Returns the link that provides the URI of next page in a paged feed.
    
    Specified by:
    
    getNextLink in interface IFeed
    
    Returns:
    Link that provides the URI of next page in a paged feed or null for none.
  - getPreviousLink
```
public Link getPreviousLink()
```
    Returns the link that provides the URI of previous page in a paged feed.
    
    Specified by:
    
    getPreviousLink in interface IFeed
    
    Returns:
    Link that provides the URI of previous page in a paged feed or null for none.
  - getFeedBatchLink
```
public Link getFeedBatchLink()
```
    Returns the link that provides the URI that can be used to batch operations to query, insert, update and delete entries on this feed.
    
    Specified by:
    
    getFeedBatchLink in interface IFeed
    
    Returns:
    Link that provides the URI that can be used to batch operations to query, insert, update and delete entries on this feed or null for none.
  - getSelf
```
public Feed getSelf()
             throws java.io.IOException,
                    ServiceException
```
    Returns the current representation of the feed by requesting it from the associated service using the feed's self link.
    
    Returns:
    the current state of the feed.
    
    Throws:
    
    java.io.IOException
    
    ServiceException
  - removeLinks
```
public void removeLinks()
```
    Removes all links.
    
    Specified by:
    
    removeLinks in interface IAtom
  - insert
```
public <T extends Entry> T insert(T newEntry)
                       throws ServiceException,
                              java.io.IOException
```
    Inserts a new Entry into the feed, if the feed is currently associated with a Service.
    
    Returns:
    the inserted Entry returned by the Service.
    
    Throws:
    
    ServiceException - If there is no associated GData service or the service is unable to perform the insertion.
    
    java.lang.UnsupportedOperationException - If insert is not supported for the target feed.
    
    java.io.IOException - If there is an error communicating with the GData service.
  - narrow
```
protected Element narrow(ElementMetadata<?,?> meta,
             ValidationContext vc)
```
    Narrows this feed using categories with an appropriate kind value. This will loop through the categories, checking if they represent kinds, and adapting the feed to that kind if an appropriate adaptation was found. This will return the most specific subtype of the narrowed type.
    
    Overrides:
    
    narrow in class Element
    
    Parameters:
    meta - the element metadata to narrow to.
    vc - validation context
    
    Returns:
    element narrowed down to the most specific type
  - resolve
```
public Element resolve(ElementMetadata<?,?> metadata,
              ValidationContext vc)
```
    Description copied from class: Element
    
    Resolve this element's state against the metadata. Accumulates errors in caller's validation context.
    
    Overrides:
    
    resolve in class Element
    
    vc - validation context
    
    Returns:
    the narrowed element if narrowing took place.
  - getEntries
```
public <T extends Entry> java.util.List<T> getEntries(java.lang.Class<T> returnClass)
```
    Gets a list of entries of a particular kind. Will only return entries that match the expected return class.

Class Feed

Nested Class Summary

Nested classes/interfaces inherited from class com.google.gdata.model.atom.Source

Field Summary

Fields inherited from class com.google.gdata.model.atom.Source

Constructor Summary

Method Summary

Methods inherited from class com.google.gdata.model.atom.Source

Methods inherited from class com.google.gdata.model.Element

Methods inherited from class java.lang.Object

Methods inherited from interface com.google.gdata.data.IFeed

Methods inherited from interface com.google.gdata.data.IAtom

Field Detail

KEY

XML_BASE

ITEMS_PER_PAGE

START_INDEX

TOTAL_RESULTS

feedState

Constructor Detail

Feed

Feed

Feed

Method Detail

registerMetadata

getService

setService

getCanPost

setCanPost

getVersionId

setVersionId

getEtag

setEtag

getKind

setKind

getSelectedFields

setSelectedFields

getXmlBase

setXmlBase

getTotalResults

setTotalResults

getStartIndex

setStartIndex

getItemsPerPage

setItemsPerPage

getEntries

getEntries

setEntries

clearEntries

addEntry

removeEntry

createEntry

createEntry

getEntryPostLink

getSelfLink

getNextLink

getPreviousLink

getFeedBatchLink

getSelf

removeLinks

insert

narrow

resolve

getEntries