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package org.glassfish.jersey.uri;
import java.util.Comparator;
/**
* A path pattern that is a regular expression generated from a URI path
* template.
*
* The path pattern is normalized by removing a terminating "/" if present.
*
* The path pattern is post-fixed with a right hand pattern that consists of either
* a matching group that matches zero or more path segments,
* see {@link RightHandPath#capturingZeroOrMoreSegments}, or zero path
* segments, see {@link RightHandPath#capturingZeroSegments}.
*
* @author Paul Sandoz
*/
public final class PathPattern extends PatternWithGroups {
/**
* Empty path pattern matching only empty string.
*/
public static final PathPattern EMPTY_PATTERN = new PathPattern();
/**
* Path pattern matching the end of a URI path. Can be either empty {@code ""}
* or contain a trailing slash {@code "/"}.
*/
public static final PathPattern END_OF_PATH_PATTERN = new PathPattern("", PathPattern.RightHandPath.capturingZeroSegments);
/**
* Path pattern matching the any URI path.
*/
public static final PathPattern OPEN_ROOT_PATH_PATTERN = new PathPattern("", RightHandPath.capturingZeroOrMoreSegments);
/**
* Path pattern comparator that defers to {@link UriTemplate#COMPARATOR comparing
* the templates} associated with the patterns.
*/
public static final Comparator COMPARATOR = new Comparator() {
@Override
public int compare(PathPattern o1, PathPattern o2) {
return UriTemplate.COMPARATOR.compare(o1.template, o2.template);
}
};
/**
* The set of right hand path patterns that may be appended to a path
* pattern.
*/
public static enum RightHandPath {
/**
* A capturing group that matches zero or more path segments and
* keeps the matching path template open.
*/
capturingZeroOrMoreSegments("(/.*)?"),
/**
* A capturing group that matches zero segments and effectively
* closes the matching path template.
*/
capturingZeroSegments("(/)?");
//
private final String regex;
private RightHandPath(String regex) {
this.regex = regex;
}
private String getRegex() {
return regex;
}
}
/**
* Return a new path pattern with a same path template but
* a {@link RightHandPath#capturingZeroSegments closed} right hand path.
*
* @param pattern an (open) path pattern to convert to a closed pattern.
* @return closed path pattern for the same path template.
*/
public static PathPattern asClosed(PathPattern pattern) {
return new PathPattern(pattern.getTemplate().getTemplate(), RightHandPath.capturingZeroSegments);
}
//
private final UriTemplate template;
private PathPattern() {
super();
this.template = UriTemplate.EMPTY;
}
/**
* Create a path pattern and post fix with
* {@link RightHandPath#capturingZeroOrMoreSegments}.
*
* @param template the path template.
* @see #PathPattern(String, PathPattern.RightHandPath)
*/
public PathPattern(String template) {
this(new PathTemplate(template));
}
/**
* Create a path pattern and post fix with
* {@link RightHandPath#capturingZeroOrMoreSegments}.
*
* @param template the path template
* @see #PathPattern(PathTemplate, PathPattern.RightHandPath)
*/
public PathPattern(PathTemplate template) {
super(postfixWithCapturingGroup(template.getPattern().getRegex()),
addIndexForRightHandPathCapturingGroup(template.getNumberOfRegexGroups(),
template.getPattern().getGroupIndexes()));
this.template = template;
}
/**
* Create a path pattern and post fix with a right hand path pattern.
*
* @param template the path template.
* @param rhpp the right hand path pattern postfix.
*/
public PathPattern(String template, RightHandPath rhpp) {
this(new PathTemplate(template), rhpp);
}
/**
* Create a path pattern and post fix with a right hand path pattern.
*
* @param template the path template.
* @param rhpp the right hand path pattern postfix.
*/
public PathPattern(PathTemplate template, RightHandPath rhpp) {
super(postfixWithCapturingGroup(template.getPattern().getRegex(), rhpp),
addIndexForRightHandPathCapturingGroup(template.getNumberOfRegexGroups(),
template.getPattern().getGroupIndexes()));
this.template = template;
}
public UriTemplate getTemplate() {
return template;
}
private static String postfixWithCapturingGroup(String regex) {
return postfixWithCapturingGroup(regex, RightHandPath.capturingZeroOrMoreSegments);
}
private static String postfixWithCapturingGroup(String regex, RightHandPath rhpp) {
if (regex.endsWith("/")) {
regex = regex.substring(0, regex.length() - 1);
}
return regex + rhpp.getRegex();
}
private static int[] addIndexForRightHandPathCapturingGroup(int numberOfGroups, int[] indexes) {
if (indexes.length == 0) {
return indexes;
}
int[] cgIndexes = new int[indexes.length + 1];
System.arraycopy(indexes, 0, cgIndexes, 0, indexes.length);
cgIndexes[indexes.length] = numberOfGroups + 1;
return cgIndexes;
}
}