org.apache.wink.common.internal.uritemplate.UriTemplateMatcher Maven / Gradle / Ivy
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package org.apache.wink.common.internal.uritemplate;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.PathSegment;
import org.apache.wink.common.internal.MultivaluedMapImpl;
import org.apache.wink.common.internal.i18n.Messages;
import org.apache.wink.common.internal.uri.UriEncoder;
import org.apache.wink.common.internal.uritemplate.UriTemplateProcessor.CapturingGroup;
public class UriTemplateMatcher {
protected UriTemplateProcessor parent;
protected String uri;
protected Matcher matcher;
protected boolean matches;
private MultivaluedMap variables;
private MultivaluedMap variablesStartIndices;
private MultivaluedMap> variablesPathSegments;
@Override
public String toString() {
return String.format("Parent: %s; URI: %s; Matcher: %s; Matches: %b", //$NON-NLS-1$
parent,
uri,
matcher,
matches);
}
/* package */UriTemplateMatcher(UriTemplateProcessor parent) {
this.parent = parent;
this.uri = null;
this.matcher = null;
this.matches = false;
this.variables = null;
this.variablesStartIndices = null;
this.variablesPathSegments = null;
}
/**
* Get the {@link UriTemplateProcessor} that this matcher was created from
*
* @return UriTemplateProcessor instance
*/
public UriTemplateProcessor getProcessor() {
return parent;
}
/**
* Try to match a URI and return the variable values or null if it
* does not match. Same as calling match(uri, false)
*
* @param uri the URI
* @return variable values or null if it does not match
*/
public MultivaluedMap match(String uri) {
return match(uri, false);
}
/**
* Try to match a URI and return the variable values or null if it
* does not match.
*
* @param uri the URI
* @param decode indicates whether to decode the values before returning
* them
* @return variable values or null if it does not match
*/
public MultivaluedMap match(String uri, boolean decode) {
if (!matches(uri)) {
return null;
}
return getVariables(decode);
}
/**
* Match the provided uri against the uri template of this processor. If the
* match was successful, then it is possible to get the variable values from
* the matched uri.
*
* @param uri the uri to match against the processor template
* @return true if the uri matches the pattern, false otherwise
*/
public boolean matches(String uri) {
if (uri == null) {
throw new NullPointerException(Messages.getMessage("variableIsNull", "uri")); //$NON-NLS-1$ //$NON-NLS-2$
}
this.uri = uri;
this.variables = null;
this.variablesStartIndices = null;
this.variablesPathSegments = null;
this.matcher = parent.getPattern().matcher(uri);
return (this.matches = this.matcher.matches());
}
/**
* Returns whether the last successful match was an exact match, that is, if
* the matched tail part is empty.
*
* @return true if the match was exact, false otherwise.
*/
public boolean isExactMatch() {
assertMatchState();
String tail = getTail();
return (tail == null || tail.length() == 0 || tail.equals("/")); //$NON-NLS-1$
}
/**
* Get the decoded tail (literal) part of the last uri that matched the
* template. This is mainly used for searching of sub-resources during
* request dispatching. Same as calling getTail(true).
*
* @return the decoded tail part of the last matched uri
*/
public String getTail() {
return getTail(true);
}
/**
* Get the tail (literal) part of the last uri that matched the template.
* This is mainly used for searching of sub-resources during request
* dispatching.
*
* @param decode indicates whether the tail should be decoded before
* returning
* @return the tail part of the last matched uri
*/
public String getTail(boolean decode) {
assertMatchState();
if (parent.tail == null) {
return ""; //$NON-NLS-1$
}
String value = matcher.group(parent.tail.getCapturingGroupId());
if (decode) {
value = UriEncoder.decodeString(value);
}
return value;
}
/**
* Get the decoded head part of the last uri that matched the template. Same
* as calling getHead(true).
*
* @return the decoded head part of the last matched uri
*/
public String getHead() {
return getHead(true);
}
/**
* Get the head part of the last uri that matched the template.
*
* @param decode indicates whether the head should be decoded before
* returning
* @return the head part of the last matched uri
*/
public String getHead(boolean decode) {
assertMatchState();
if (parent.head == null) {
return uri;
}
String head = matcher.group(parent.head.getCapturingGroupId());
if (decode) {
head = UriEncoder.decodeString(head);
}
// if the template ends with a "/" and the tail is "/",
// then add it to the head because the tail has caught it but it
// should be part of the head
String tail = getTail(false);
if (parent.template.endsWith("/") && tail != null && tail.equals("/")) { //$NON-NLS-1$ //$NON-NLS-2$
head += tail;
}
return head;
}
/**
* Get the decoded value of the specified template variable from the last
* matched uri. If there is more than one value, then the first value is
* returned. Same as calling getVariableValue(name, true)
*
* @param name the name of the template variable to get the value for
* @return the variable value or null if it does not exist in the template
* @throws IllegalStateException if the last match failed
*/
public String getVariableValue(String name) throws IllegalStateException {
return getVariableValue(name, true);
}
/**
* Get the value of the specified template variable from the last matched
* uri. If there is more than one value, then the first value is returned.
*
* @param name the name of the template variable to get the value for
* @param decode indicates whether the value should be decoded
* @return the variable value or null if it does not exist in
* the template
* @throws IllegalStateException if the last match failed
*/
public String getVariableValue(String name, boolean decode) throws IllegalStateException {
List list = getVariableValues(name, decode);
if (list.size() == 0) {
return null;
}
return list.get(0);
}
/**
* Get the decoded values of the specified template variable from the last
* matched uri. Same as calling getVariableValues(name, true)
*
* @param name the name of the template variable to get the value for
* @return a list of variable values
* @throws IllegalStateException if the last match failed
*/
public List getVariableValues(String name) throws IllegalStateException {
return getVariableValues(name, true);
}
/**
* Get the values of the specified template variable from the last matched
* uri.
*
* @param name the name of the template variable to get the value for
* @param decode indicates whether the values should be decoded
* @return a list of variable values
* @throws IllegalStateException if the last match failed
*/
public List getVariableValues(String name, boolean decode) throws IllegalStateException {
if (name == null) {
return new ArrayList();
}
MultivaluedMap variables = getVariables(decode);
List values = variables.get(name);
if (values == null) {
return new ArrayList();
}
return values;
}
/**
* Get a multivalued map of the template variables and their values from the
* last matched uri. Same as calling getVariables(false)
*
* @return a map of variables and their values from the last matched uri
* @throws IllegalStateException if the last match failed
*/
public MultivaluedMap getVariables() throws IllegalStateException {
return getVariables(false);
}
/**
* Get a multivalued map of the template variables and their values from the
* last matched uri.
*
* @param decode indicates whether the values should be decoded
* @return a map of variables and their values from the last matched uri
* @throws IllegalStateException if the last match failed
*/
public MultivaluedMap getVariables(boolean decode) throws IllegalStateException {
return storeVariables(null, decode);
}
/**
* Get a multivalued map of the template variables and their values from the
* last matched uri
*
* @param out an output multivalued map to receive the values of variables.
* If null, a new instance is created. This map is also the
* return value.
* @param decode indicates whether the values should be decoded
* @return the multivalued map of variables and their values from the last
* matched uri
* @throws IllegalStateException if the last match failed
*/
public MultivaluedMap storeVariables(MultivaluedMap out,
boolean decode)
throws IllegalStateException {
assertMatchState();
buildVariables();
if (out == null) {
out = new MultivaluedMapImpl();
}
MultivaluedMapImpl.addAll(variables, out);
if (decode) {
decodeValues(out);
}
return out;
}
/**
* Store the path segments that are associated with each matched variable
* into the output map
*
* @param uriSegments the full list of the original request uri segments
* (including any matrix parameters)
* @param offset the offset into the segments list to take the matched
* variable segments from
* @param count the number of segments from the specified offset
* @param out an output multivalued map to receive the path segments of the
* variables. If null, a new instance is created. This map is
* also the return value.
* @return the multivalued map of variables path segments from the last
* matched uri
* @throws IllegalStateException if the last match failed
*/
public MultivaluedMap> storeVariablesPathSegments(List segments,
int offset,
int count,
MultivaluedMap> out)
throws IllegalStateException {
assertMatchState();
buildVariablesPathSegments(segments, offset, count);
if (out == null) {
out = new MultivaluedMapImpl>();
}
MultivaluedMapImpl.addAll(variablesPathSegments, out);
return out;
}
/**
* extract the values of the matched variables
*/
private void buildVariables() {
if (variables != null) {
return;
}
variables = new MultivaluedMapImpl();
variablesStartIndices = new MultivaluedMapImpl();
MultivaluedMap variableGroups = parent.getVariables();
// go over all the variables
for (String name : variableGroups.keySet()) {
// go over all of the template variables that have this name
List vars = variableGroups.get(name);
for (CapturingGroup var : vars) {
// retrieve the capturing group that is associated with this
// variable
int group = var.getCapturingGroupId();
// get the value that was captured during the last match and
// the start index of the matched string
String matched = matcher.group(group);
int startIndex = matcher.start(group);
// fire the 'onMatch' event for the variable
var.onMatch(matched, variables, startIndex, variablesStartIndices);
}
}
}
/**
* builds the list of path segments that are associated with every variable
*
* @param segments the list of path segments of the original uri used for
* the matching
* @param offset the offset into the segments list to take the matched
* variable segments from
* @param count the number of segments from the specified offset
*/
private void buildVariablesPathSegments(List segments, int offset, int count) {
if (variablesPathSegments != null) {
return;
}
buildVariables();
variablesPathSegments = new MultivaluedMapImpl>();
// this method finds the path segments that every variable is part of in
// the following way:
// for every value of every variable, use the start and end indices of
// the matched value
// to calculate in which segments the matched variable falls into.
// go over all of the variables
for (String name : variables.keySet()) {
// go over all of the values of each variable
for (int i = 0; i < variables.get(name).size(); ++i) {
String variableValue = variables.get(name).get(i);
if (variableValue == null) {
// aggressive safety
continue;
}
int variableValueStartIndex = variablesStartIndices.get(name).get(i);
List variableSegments = new LinkedList();
int pathLength = 0;
// go over all of the segments of the request uri that was
// matched
L1: for (int segmentIndex = offset; segmentIndex < offset + count; ++segmentIndex) {
pathLength += segments.get(segmentIndex).getPath().length();
if (variableValueStartIndex < pathLength) {
// found the segment that the variable value starts in.
// now we need to find how many segments this variable
// spans across.
int lastSegmentIndex = segmentIndex;
int variableValueEndIndex =
variableValueStartIndex + variableValue.length() - 1;
// find the segment that this matched variable value
// ends in
while (variableValueEndIndex > pathLength) {
++lastSegmentIndex;
// + 1 is to count for the '/' between the segments
pathLength += segments.get(lastSegmentIndex).getPath().length() + 1;
}
// copy all the segments that the variable spans across
// to the output list
for (; segmentIndex <= lastSegmentIndex; ++segmentIndex) {
variableSegments.add(segments.get(segmentIndex));
}
break L1; // found all the segments of this variable
// value
} else if (variableValueStartIndex == pathLength) {
// no PathParam was provided... only matrix params or
// empty
// just use what we have
variableSegments.add(segments.get(segmentIndex));
break L1;
} else {
pathLength += 1; // to count for the '/' between the
// segments
}
}
variablesPathSegments.add(name, variableSegments);
}
}
}
// private int getVariableStartIndex(String name) throws
// IllegalStateException {
// if (name == null) {
// throw new NullPointerException("name");
// }
// assertMatchState();
//
// MultivaluedMap variables = parent.getVariables();
// List vars = variables.get(name);
// if (vars == null || vars.size() == 0) {
// return -1;
// }
//
// CapturingGroup capGroup = vars.get(vars.size() - 1);
// return matcher.start(capGroup.getCapturingGroupId());
// }
//
protected MultivaluedMap decodeValues(MultivaluedMap values) {
for (List list : values.values()) {
for (int i = 0; i < list.size(); ++i) {
list.set(i, UriEncoder.decodeString(list.get(i)));
}
}
return values;
}
protected void assertMatchState() {
if (!matches) {
throw new IllegalStateException(Messages.getMessage("lastMatchWasUnsuccessful")); //$NON-NLS-1$
}
}
}
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