org.springframework.web.util.pattern

Class PathPattern

java.lang.Object

org.springframework.web.util.pattern.PathPattern

All Implemented Interfaces:

Comparable<PathPattern>

public class PathPattern
extends Object
implements Comparable<PathPattern>

Representation of a parsed path pattern. Includes a chain of path elements for fast matching and accumulates computed state for quick comparison of patterns.

PathPattern matches URL paths using the following rules:

• ? matches one character
• * matches zero or more characters within a path segment
• ** matches zero or more path segments until the end of the path
• {spring} matches a path segment and captures it as a variable named "spring"
• {spring:[a-z]+} matches the regexp [a-z]+ as a path variable named "spring"
• {*spring} matches zero or more path segments until the end of the path and captures it as a variable named "spring"

Note: In contrast to AntPathMatcher, ** is supported only at the end of a pattern. For example /pages/{**} is valid but /pages/{**}/details is not. The same applies also to the capturing variant {*spring}. The aim is to eliminate ambiguity when comparing patterns for specificity.

Examples

• /pages/t?st.html — matches /pages/test.html as well as /pages/tXst.html but not /pages/toast.html
• /resources/*.png — matches all .png files in the resources directory
• /resources/** — matches all files underneath the /resources/ path, including /resources/image.png and /resources/css/spring.css
• /resources/{*path} — matches all files underneath the /resources/, as well as /resources, and captures their relative path in a variable named "path"; /resources/image.png will match with "path" → "/image.png", and /resources/css/spring.css will match with "path" → "/css/spring.css"
• /resources/{filename:\\w+}.dat will match /resources/spring.dat and assign the value "spring" to the filename variable

Since:

5.0

Author:

Andy Clement, Rossen Stoyanchev

See Also:

PathContainer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PathPattern.PathMatchInfo Holder for URI variables and path parameters (matrix variables) extracted based on the pattern for a given matched path.
static class	PathPattern.PathRemainingMatchInfo Holder for the result of a match on the start of a pattern.

Field Summary

Fields

Modifier and Type	Field and Description
static Comparator<PathPattern>	SPECIFICITY_COMPARATOR Comparator that sorts patterns by specificity as follows: Null instances are last.

Method Summary

Modifier and Type	Method and Description
PathPattern	combine(PathPattern pattern2string) Combine this pattern with another.
int	compareTo(PathPattern otherPattern) Compare this pattern with a supplied pattern: return -1,0,+1 if this pattern is more specific, the same or less specific than the supplied pattern.
boolean	equals(Object other)
PathContainer	extractPathWithinPattern(PathContainer path) Determine the pattern-mapped part for the given path.
String	getPatternString() Return the original String that was parsed to create this PathPattern.
int	hashCode()
boolean	hasPatternSyntax() Whether the pattern string contains pattern syntax that would require use of matches(PathContainer), or if it is a regular String that could be compared directly to others.
PathPattern.PathMatchInfo	matchAndExtract(PathContainer pathContainer) Match this pattern to the given URI path and return extracted URI template variables as well as path parameters (matrix variables).
boolean	matches(PathContainer pathContainer) Whether this pattern matches the given path.
PathPattern.PathRemainingMatchInfo	matchStartOfPath(PathContainer pathContainer) Match the beginning of the given path and return the remaining portion not covered by this pattern.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SPECIFICITY_COMPARATOR

public static final Comparator<PathPattern> SPECIFICITY_COMPARATOR

Comparator that sorts patterns by specificity as follows:

1. Null instances are last.
2. Catch-all patterns are last.
3. If both patterns are catch-all, consider the length (longer wins).
4. Compare wildcard and captured variable count (lower wins).
5. Consider length (longer wins)

Method Detail

getPatternString

public String getPatternString()

Return the original String that was parsed to create this PathPattern.

hasPatternSyntax

public boolean hasPatternSyntax()

Whether the pattern string contains pattern syntax that would require use of matches(PathContainer), or if it is a regular String that could be compared directly to others.

Since:

5.2

matches

public boolean matches(PathContainer pathContainer)

Whether this pattern matches the given path.

Parameters:

pathContainer - the candidate path to attempt to match against

Returns:

true if the path matches this pattern

matchAndExtract

@Nullable
public PathPattern.PathMatchInfo matchAndExtract(PathContainer pathContainer)

Match this pattern to the given URI path and return extracted URI template variables as well as path parameters (matrix variables).

Parameters:

pathContainer - the candidate path to attempt to match against

Returns:

info object with the extracted variables, or null for no match

matchStartOfPath

@Nullable
public PathPattern.PathRemainingMatchInfo matchStartOfPath(PathContainer pathContainer)

Match the beginning of the given path and return the remaining portion not covered by this pattern. This is useful for matching nested routes where the path is matched incrementally at each level.

Parameters:

pathContainer - the candidate path to attempt to match against

Returns:

info object with the match result or null for no match

extractPathWithinPattern

public PathContainer extractPathWithinPattern(PathContainer path)

Determine the pattern-mapped part for the given path.

For example:

• '/docs/cvs/commit.html' and '/docs/cvs/commit.html → ''
• '/docs/*' and '/docs/cvs/commit' → 'cvs/commit'
• '/docs/cvs/*.html' and '/docs/cvs/commit.html → 'commit.html'
• '/docs/**' and '/docs/cvs/commit → 'cvs/commit'

Notes:

• Assumes that matches(org.springframework.http.server.PathContainer) returns true for the same path but does not enforce this.
• Duplicate occurrences of separators within the returned result are removed
• Leading and trailing separators are removed from the returned result

Parameters:

path - a path that matches this pattern

Returns:

the subset of the path that is matched by pattern or "" if none of it is matched by pattern elements

compareTo

public int compareTo(@Nullable
                     PathPattern otherPattern)

Compare this pattern with a supplied pattern: return -1,0,+1 if this pattern is more specific, the same or less specific than the supplied pattern. The aim is to sort more specific patterns first.

Specified by:

compareTo in interface Comparable<PathPattern>

combine

public PathPattern combine(PathPattern pattern2string)

Combine this pattern with another.

equals

public boolean equals(@Nullable
                      Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object