edu.cmu.sphinx.alignment.tokenizer

Class Item

java.lang.Object

edu.cmu.sphinx.alignment.tokenizer.Item

public class Item
extends java.lang.Object

Represents a node in a Relation. Items can have shared contents but each item has its own set of Daughters. The shared contents of an item (represented by ItemContents) includes the feature set for the item and the set of all relations that this item is contained in. An item can be contained in a number of relations and as daughters to other items. This class is used to keep track of all of these relationships. There may be many instances of item that reference the same shared ItemContents.

Constructor Summary

Constructors

Constructor and Description
Item(Relation relation, ItemContents sharedContents) Creates an item.

Method Summary

Modifier and Type	Method and Description
Item	addDaughter(Item item) Adds the given item as a daughter to this item.
Item	appendItem(Item originalItem) Appends an item in this list after this item.
Item	createDaughter() Creates a new Item, adds it as a daughter to this item and returns the new item.
boolean	equalsShared(Item otherItem) Determines if the shared contents of the two items are the same.
java.lang.Object	findFeature(java.lang.String pathAndFeature) Finds the feature by following the given path.
Item	findItem(java.lang.String path) Finds the item specified by the given path.
Item	getDaughter() Retrieves the first daughter of this item.
FeatureSet	getFeatures() Returns the feature set of this item.
Item	getItemAs(java.lang.String relationName) Finds the item in the given relation that has the same shared contents.
Item	getLastDaughter() Retrieves the last daughter of this item.
Item	getNext() Gets the next item in this list.
Item	getNthDaughter(int which) Retrieves the Nth daughter of this item.
Relation	getOwnerRelation() Retrieves the owning Relation.
Item	getParent() Returns the parent of this item.
Item	getPrevious() Gets the previous item in this list.
ItemContents	getSharedContents() Retrieves the shared contents for this item.
Utterance	getUtterance() Returns the utterance associated with this item.
boolean	hasDaughters() Determines if this item has daughters.
Item	prependItem(Item originalItem) Prepends an item in this list before this item.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Item

public Item(Relation relation,
            ItemContents sharedContents)

Creates an item. The item is coupled to a particular Relation. If shared contents is null a new sharedContents is created.

Parameters:

relation - the relation that owns this item

sharedContents - the contents that is shared with others. If null, a new sharedContents is created.

Method Detail

getItemAs

public Item getItemAs(java.lang.String relationName)

Finds the item in the given relation that has the same shared contents.

Parameters:

relationName - the relation of interest

Returns:

the item as found in the given relation or null if not found

getOwnerRelation

public Relation getOwnerRelation()

Retrieves the owning Relation.

Returns:

the relation that owns this item

getSharedContents

public ItemContents getSharedContents()

Retrieves the shared contents for this item.

Returns:

the shared item contents

hasDaughters

public boolean hasDaughters()

Determines if this item has daughters.

Returns:

true if this item has daughters

getDaughter

public Item getDaughter()

Retrieves the first daughter of this item.

Returns:

the first daughter or null if none

getNthDaughter

public Item getNthDaughter(int which)

Retrieves the Nth daughter of this item.

Parameters:

which - the index of the daughter to return

Returns:

the Nth daughter or null if none at the given index

getLastDaughter

public Item getLastDaughter()

Retrieves the last daughter of this item.

Returns:

the last daughter or null if none at the given index

addDaughter

public Item addDaughter(Item item)

Adds the given item as a daughter to this item.

Parameters:

item - for the new daughter

Returns:

created item

createDaughter

public Item createDaughter()

Creates a new Item, adds it as a daughter to this item and returns the new item.

Returns:

the newly created item that was added as a daughter

getParent

public Item getParent()

Returns the parent of this item.

Returns:

the parent of this item

getUtterance

public Utterance getUtterance()

Returns the utterance associated with this item.

Returns:

the utterance that contains this item

getFeatures

public FeatureSet getFeatures()

Returns the feature set of this item.

Returns:

the feature set of this item

findFeature

public java.lang.Object findFeature(java.lang.String pathAndFeature)

Finds the feature by following the given path. Path is a string of ":" or "." separated strings with the following interpretations:

• n - next item
• p - previous item
• parent - the parent
• daughter - the daughter
• daughter1 - same as daughter
• daughtern - the last daughter
• R:relname - the item as found in the given relation 'relname'

The last element of the path will be interpreted as a voice/language specific feature function (if present) or an item feature name. If the feature function exists it will be called with the item specified by the path, otherwise, a feature will be retrieved with the given name. If neither exist than a String "0" is returned.

Parameters:

pathAndFeature - the path to follow

Returns:

created object

findItem

public Item findItem(java.lang.String path)

Finds the item specified by the given path. Path is a string of ":" or "." separated strings with the following interpretations:

• n - next item
• p - previous item
• parent - the parent
• daughter - the daughter
• daughter1 - same as daughter
• daughtern - the last daughter
• R:relname - the item as found in the given relation 'relname'

If the given path takes us outside of the bounds of the item graph, then list access exceptions will be thrown.

Parameters:

path - the path to follow

Returns:

the item at the given path

getNext

public Item getNext()

Gets the next item in this list.

Returns:

the next item or null

getPrevious

public Item getPrevious()

Gets the previous item in this list.

Returns:

the previous item or null

appendItem

public Item appendItem(Item originalItem)

Appends an item in this list after this item.

Parameters:

originalItem - new item has shared contents with this item (or * null)

Returns:

the newly appended item

prependItem

public Item prependItem(Item originalItem)

Prepends an item in this list before this item.

Parameters:

originalItem - new item has shared contents with this item (or * null)

Returns:

the newly appended item

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equalsShared

public boolean equalsShared(Item otherItem)

Determines if the shared contents of the two items are the same.

Parameters:

otherItem - the item to compare

Returns:

true if the shared contents are the same