org.jboss.dna.graph.property.basic
Class RootPath

java.lang.Object
  org.jboss.dna.graph.property.basic.AbstractPath
      org.jboss.dna.graph.property.basic.RootPath

All Implemented Interfaces:

Serializable, Comparable<Path>, Iterable<Path.Segment>, Path, Readable

@Immutable
public class RootPath
extends AbstractPath

Optimized implementation of Path that serves as the root path.

Author:

Randall Hauch

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.jboss.dna.graph.property.Path

Path.Segment

Field Summary

static Path

INSTANCE

Fields inherited from class org.jboss.dna.graph.property.basic.AbstractPath

SELF_PATH

Fields inherited from interface org.jboss.dna.graph.property.Path

DEFAULT_DECODER, DEFAULT_ENCODER, DEFAULT_INDEX, DELIMITER, DELIMITER_STR, JSR283_DECODER, JSR283_ENCODER, NO_OP_DECODER, NO_OP_ENCODER, PARENT, PARENT_NAME, PARENT_SEGMENT, SELF, SELF_NAME, SELF_SEGMENT, URL_DECODER, URL_ENCODER

Method Summary

int	compareTo(Path other)
boolean	equals(Object obj)
Path	getAncestor(int degree) Return the path to the ancestor of the supplied degree.
Path	getCanonicalPath() Get the canonical form of this path. A canonical path has is absolute and Path.isNormalized().
Path	getCommonAncestor(Path that) Find the lowest common ancestor of this path and the supplied path.
Path.Segment	getLastSegment() Get the last segment in this path.
Path	getNormalizedPath() Get a normalized path with as many ".." segments and all "." resolved. The relative path ".", however, will return itself as the normalized path, since it cannot be resolved any further.
Path	getParent() Return the path to the parent, or this path if it is the root. This is an efficient operation that does not require copying any data.
Path.Segment	getSegment(int index) Get the segment at the supplied index.
Path.Segment[]	getSegmentsArray() Obtain a copy of the segments in this path. None of the segments are encoded.
List<Path.Segment>	getSegmentsList() Get an unmodifiable list of the path segments.
String	getString() Get the string form of the object. A default encoder is used to encode characters.
String	getString(NamespaceRegistry namespaceRegistry) Get the string form of the object, using the supplied namespace registry to convert any namespace URIs to prefixes. A default encoder is used to encode characters.
String	getString(NamespaceRegistry namespaceRegistry, TextEncoder encoder) Get the encoded string form of the object, using the supplied namespace registry to convert the any namespace URIs to prefixes.
String	getString(NamespaceRegistry namespaceRegistry, TextEncoder encoder, TextEncoder delimiterEncoder) Get the encoded string form of the object, using the supplied namespace registry to convert the names' namespace URIs to prefixes and the supplied encoder to encode characters, and using the second delimiter to encode (or convert) the delimiter used between the namespace prefix and the local part of any names.
String	getString(TextEncoder encoder) Get the encoded string form of the object, using the supplied encoder to encode characters.
boolean	hasSameAncestor(Path that) Determine whether this path and the supplied path have the same immediate ancestor. In other words, this method determines whether the node represented by this path is a sibling of the node represented by the supplied path.
boolean	isAbsolute() Return whether this path is an absolute path.
boolean	isAncestorOf(Path decendant) Determine whether this path is an ancestor of the supplied path. A path is considered an ancestor of another path if the the ancestor path appears in its entirety at the beginning of the decendant path, and where the decendant path contains at least one additional segment.
boolean	isAtOrAbove(Path other) Determine whether this path is the same as to or a ancestor of the supplied path. This method is equivalent to (but may be more efficient than) calling isSame(other) || isAncestor(other), and is a convenience method that is identical to calling other.isAtOrBelow(this).
boolean	isAtOrBelow(Path other) Determine whether this path is the same as to or a decendant of the supplied path. This method is equivalent to (but may be more efficient than) calling isSame(other) || isAncestor(other).
boolean	isDecendantOf(Path ancestor) Determine whether this path is an decendant of the supplied path. A path is considered a decendant of another path if the the decendant path starts exactly with the entire ancestor path but contains at least one additional segment.
boolean	isNormalized() Return whether this path is normalized and contains no "." segments and as few ".." segments as possible.
boolean	isRoot() Return whether this path represents the root path.
boolean	isSameAs(Path other) Determine whether this path represents the same as the supplied path. This is equivalent to calling this.compareTo(other) == 0 .
Iterator<Path.Segment>	iterator()
Iterator<Path>	pathsFromRoot() Return an iterator that walks the paths from the root path down to this path. This method always returns at least one path (the root returns an iterator containing itself).
Path	resolve(Path relativePath) Get the absolute path by resolving the supplied relative (non-absolute) path against this absolute path.
int	size() Return the number of segments in this path.
Path	subpath(int beginIndex) Return a new path consisting of the segments starting at beginIndex index (inclusive). This is equivalent to calling path.subpath(beginIndex,path.size()-1).
Path	subpath(int beginIndex, int endIndex) Return a new path consisting of the segments between the beginIndex index (inclusive) and the endIndex index (exclusive).

Methods inherited from class org.jboss.dna.graph.property.basic.AbstractPath

hashCode, relativeTo, resolveAgainst, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final Path INSTANCE

Method Detail

getAncestor

public Path getAncestor(int degree)

Return the path to the ancestor of the supplied degree. An ancestor of degree x is the path that is x levels up along the path. For example, degree = 0 returns this path, while degree = 1 returns the parent of this path, degree = 2 returns the grandparent of this path, and so on. Note that the result may be unexpected if this path is not normalized, as a non-normalized path contains ".." and "." segments.

Returns:

the ancestor of the supplied degree

See Also:

Path.getAncestor(int)

getCanonicalPath

public Path getCanonicalPath()

Get the canonical form of this path. A canonical path has is absolute and Path.isNormalized().

Specified by:

getCanonicalPath in interface Path

Overrides:

getCanonicalPath in class AbstractPath

Returns:

the canonical path, or this object if it is already in its canonical form

See Also:

Path.getCanonicalPath()

getCommonAncestor

public Path getCommonAncestor(Path that)

Find the lowest common ancestor of this path and the supplied path.

Specified by:

getCommonAncestor in interface Path

Overrides:

getCommonAncestor in class AbstractPath

Parameters:

that - the other path

Returns:

the lowest common ancestor, which may be the root path if there is no other.

See Also:

Path.getCommonAncestor(org.jboss.dna.graph.property.Path)

getLastSegment

public Path.Segment getLastSegment()

Get the last segment in this path.

Specified by:

getLastSegment in interface Path

Overrides:

getLastSegment in class AbstractPath

Returns:

the last segment, or null if the path is empty

See Also:

Path.getLastSegment()

getNormalizedPath

public Path getNormalizedPath()

Get a normalized path with as many ".." segments and all "." resolved. The relative path ".", however, will return itself as the normalized path, since it cannot be resolved any further.

Specified by:

getNormalizedPath in interface Path

Overrides:

getNormalizedPath in class AbstractPath

Returns:

the normalized path, or this object if this path is already normalized

See Also:

Path.getNormalizedPath()

resolve

public Path resolve(Path relativePath)

Get the absolute path by resolving the supplied relative (non-absolute) path against this absolute path.

Specified by:

resolve in interface Path

Overrides:

resolve in class AbstractPath

Parameters:

relativePath - the relative path that is to be resolved against this path

Returns:

the absolute and normalized path resolved from this path and the supplied absolute path

See Also:

AbstractPath.resolve(org.jboss.dna.graph.property.Path)

getParent

public Path getParent()

Return the path to the parent, or this path if it is the root. This is an efficient operation that does not require copying any data.

Specified by:

getParent in interface Path

Overrides:

getParent in class AbstractPath

Returns:

the parent path, or this null if it is already the root

See Also:

Path.getParent()

getSegment

public Path.Segment getSegment(int index)

Get the segment at the supplied index.

Specified by:

getSegment in interface Path

Overrides:

getSegment in class AbstractPath

Parameters:

index - the index

Returns:

the segment

See Also:

Path.getSegment(int)

getSegmentsArray

public Path.Segment[] getSegmentsArray()

Obtain a copy of the segments in this path. None of the segments are encoded.

Specified by:

getSegmentsArray in interface Path

Overrides:

getSegmentsArray in class AbstractPath

Returns:

the array of segments as a copy

See Also:

Path.getSegmentsArray()

getSegmentsList

public List<Path.Segment> getSegmentsList()

Get an unmodifiable list of the path segments.

Returns:

the unmodifiable list of path segments; never null

See Also:

Path.getSegmentsList()

getString

public String getString()

Get the string form of the object. A default encoder is used to encode characters.

Specified by:

getString in interface Readable

Overrides:

getString in class AbstractPath

Returns:

the encoded string

See Also:

Readable.getString()

getString

public String getString(TextEncoder encoder)

Get the encoded string form of the object, using the supplied encoder to encode characters.

Specified by:

getString in interface Readable

Overrides:

getString in class AbstractPath

Parameters:

encoder - the encoder to use, or null if the default encoder should be used

Returns:

the encoded string

See Also:

Readable.getString(org.jboss.dna.common.text.TextEncoder)

getString

public String getString(NamespaceRegistry namespaceRegistry)

Get the string form of the object, using the supplied namespace registry to convert any namespace URIs to prefixes. A default encoder is used to encode characters.

Specified by:

getString in interface Readable

Overrides:

getString in class AbstractPath

Parameters:

namespaceRegistry - the namespace registry that should be used to obtain the prefix for any namespace URIs

Returns:

the encoded string

See Also:

Readable.getString(org.jboss.dna.graph.property.NamespaceRegistry)

getString

public String getString(NamespaceRegistry namespaceRegistry,
                        TextEncoder encoder)

Get the encoded string form of the object, using the supplied namespace registry to convert the any namespace URIs to prefixes.

Specified by:

getString in interface Readable

Overrides:

getString in class AbstractPath

Parameters:

namespaceRegistry - the namespace registry that should be used to obtain the prefix for the namespace URIs

encoder - the encoder to use, or null if the default encoder should be used

Returns:

the encoded string

See Also:

Readable.getString(org.jboss.dna.graph.property.NamespaceRegistry, org.jboss.dna.common.text.TextEncoder)

getString

public String getString(NamespaceRegistry namespaceRegistry,
                        TextEncoder encoder,
                        TextEncoder delimiterEncoder)

Get the encoded string form of the object, using the supplied namespace registry to convert the names' namespace URIs to prefixes and the supplied encoder to encode characters, and using the second delimiter to encode (or convert) the delimiter used between the namespace prefix and the local part of any names.

Specified by:

getString in interface Readable

Overrides:

getString in class AbstractPath

Parameters:

namespaceRegistry - the namespace registry that should be used to obtain the prefix for the namespace URIs in the segment names

encoder - the encoder to use for encoding the local part and namespace prefix of any names, or null if the default encoder should be used

delimiterEncoder - the encoder to use for encoding the delimiter between the local part and namespace prefix of any names, or null if the standard delimiter should be used

Returns:

the encoded string

See Also:

Readable.getString(org.jboss.dna.graph.property.NamespaceRegistry, org.jboss.dna.common.text.TextEncoder, org.jboss.dna.common.text.TextEncoder)

hasSameAncestor

public boolean hasSameAncestor(Path that)

Determine whether this path and the supplied path have the same immediate ancestor. In other words, this method determines whether the node represented by this path is a sibling of the node represented by the supplied path.

Specified by:

hasSameAncestor in interface Path

Overrides:

hasSameAncestor in class AbstractPath

Parameters:

that - the other path

Returns:

true if this path and the supplied path have the same immediate ancestor.

See Also:

Path.hasSameAncestor(org.jboss.dna.graph.property.Path)

isAbsolute

public boolean isAbsolute()

Return whether this path is an absolute path. A path is either relative or absolute. An absolute path starts with a "/".

Returns:

true if the path is absolute, or false otherwise

See Also:

Path.isAbsolute()

isAncestorOf

public boolean isAncestorOf(Path decendant)

Determine whether this path is an ancestor of the supplied path. A path is considered an ancestor of another path if the the ancestor path appears in its entirety at the beginning of the decendant path, and where the decendant path contains at least one additional segment.

Specified by:

isAncestorOf in interface Path

Overrides:

isAncestorOf in class AbstractPath

Parameters:

decendant - the path that may be the decendant; may be null

Returns:

true if this path is an ancestor of the supplied path, or false otherwise

See Also:

Path.isAncestorOf(org.jboss.dna.graph.property.Path)

isAtOrAbove

public boolean isAtOrAbove(Path other)

Determine whether this path is the same as to or a ancestor of the supplied path. This method is equivalent to (but may be more efficient than) calling isSame(other) || isAncestor(other), and is a convenience method that is identical to calling other.isAtOrBelow(this).

Specified by:

isAtOrAbove in interface Path

Overrides:

isAtOrAbove in class AbstractPath

Parameters:

other - the other path to compare with this path; may be null

Returns:

true if the paths are equivalent or if this path is considered an ancestor of the other path, or false otherwise

See Also:

Path.isAtOrAbove(org.jboss.dna.graph.property.Path)

isAtOrBelow

public boolean isAtOrBelow(Path other)

Determine whether this path is the same as to or a decendant of the supplied path. This method is equivalent to (but may be more efficient than) calling isSame(other) || isAncestor(other).

Specified by:

isAtOrBelow in interface Path

Overrides:

isAtOrBelow in class AbstractPath

Parameters:

other - the other path to compare with this path; may be null

Returns:

true if the paths are equivalent or if this path is considered a decendant of the other path, or false otherwise

See Also:

Path.isAtOrBelow(org.jboss.dna.graph.property.Path)

isDecendantOf

public boolean isDecendantOf(Path ancestor)

Determine whether this path is an decendant of the supplied path. A path is considered a decendant of another path if the the decendant path starts exactly with the entire ancestor path but contains at least one additional segment.

Specified by:

isDecendantOf in interface Path

Overrides:

isDecendantOf in class AbstractPath

Parameters:

ancestor - the path that may be the ancestor; may be null

Returns:

true if this path is an decendant of the supplied path, or false otherwise

See Also:

Path.isDecendantOf(org.jboss.dna.graph.property.Path)

isNormalized

public boolean isNormalized()

Return whether this path is normalized and contains no "." segments and as few ".." segments as possible. For example, the path "../a" is normalized, while "/a/b/c/../d" is not normalized.

Returns:

true if this path is normalized, or false otherwise

See Also:

Path.isNormalized()

isRoot

public boolean isRoot()

Return whether this path represents the root path.

Returns:

true if this path is the root path, or false otherwise

See Also:

Path.isRoot()

isSameAs

public boolean isSameAs(Path other)

Determine whether this path represents the same as the supplied path. This is equivalent to calling this.compareTo(other) == 0 .

Specified by:

isSameAs in interface Path

Overrides:

isSameAs in class AbstractPath

Parameters:

other - the other path to compare with this path; may be null

Returns:

true if the paths are equivalent, or false otherwise

See Also:

Path.isSameAs(org.jboss.dna.graph.property.Path)

iterator

public Iterator<Path.Segment> iterator()

Specified by:

iterator in interface Iterable<Path.Segment>

Specified by:

iterator in interface Path

Overrides:

iterator in class AbstractPath

See Also:

Path.iterator()

pathsFromRoot

public Iterator<Path> pathsFromRoot()

Return an iterator that walks the paths from the root path down to this path. This method always returns at least one path (the root returns an iterator containing itself).

Specified by:

pathsFromRoot in interface Path

Overrides:

pathsFromRoot in class AbstractPath

Returns:

the path iterator; never null

See Also:

Path.pathsFromRoot()

size

public int size()

Return the number of segments in this path.

Returns:

the number of path segments

See Also:

Path.size()

subpath

public Path subpath(int beginIndex)

Return a new path consisting of the segments starting at beginIndex index (inclusive). This is equivalent to calling path.subpath(beginIndex,path.size()-1).

Specified by:

subpath in interface Path

Overrides:

subpath in class AbstractPath

Parameters:

beginIndex - the beginning index, inclusive.

Returns:

the specified subpath

See Also:

Path.subpath(int)

subpath

public Path subpath(int beginIndex,
                    int endIndex)

Return a new path consisting of the segments between the beginIndex index (inclusive) and the endIndex index (exclusive).

Specified by:

subpath in interface Path

Overrides:

subpath in class AbstractPath

Parameters:

beginIndex - the beginning index, inclusive.

endIndex - the ending index, exclusive.

Returns:

the specified subpath

See Also:

Path.subpath(int, int)

compareTo

public int compareTo(Path other)

Specified by:

compareTo in interface Comparable<Path>

Overrides:

compareTo in class AbstractPath

See Also:

Comparable.compareTo(java.lang.Object)

equals

public boolean equals(Object obj)

Overrides:

equals in class AbstractPath

See Also:

Object.equals(java.lang.Object)