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UrlPath.java
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package act.route;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import act.app.App;
import org.osgl.util.S;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Encapsulate the logic to compare an incoming URL path with a route entry path.
* <p>
* Note we can't do simple String match as route entry path might contains the dynamic part
* </p>
*/
public class UrlPath {
static final String DYNA_PART = "";
private final List<String> parts = new ArrayList<>();
private UrlPath(CharSequence path) {
String s = path.toString();
String[] sa = s.split("/");
for (String item: sa) {
if (S.notBlank(item)) {
if (item.startsWith("{") || item.contains(":")) {
item = DYNA_PART;
}
parts.add(item);
}
}
}
public int size() {
return parts.size();
}
public String part(int index) {
return parts.get(index);
}
public String lastPart() {
return part(size() - 1);
}
/**
* Check if the URL path is a built-in service url.
*
* A built in service URL starts with `~`
* @return `true` if the URL represented by this `UrlPath` is a built-in service URL
*/
public boolean isBuiltIn() {
return !parts.isEmpty() && "~".equals(parts.get(0));
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof UrlPath) {
UrlPath that = (UrlPath) obj;
if (parts.size() != that.parts.size()) {
return false;
}
for (int i = parts.size() - 1; i >= 0; --i) {
if (!matches(parts.get(i), that.parts.get(i))) {
return false;
}
}
return true;
}
return false;
}
private static Map<String, UrlPath> paths;
public static void classInit(App app) {
paths = app.createMap();
}
public static void testClassInit() {
paths = new HashMap<>();
}
public static UrlPath of(CharSequence path) {
UrlPath urlPath = paths.get(path.toString());
if (null == urlPath) {
urlPath = new UrlPath(path);
paths.put(path.toString(), urlPath);
}
return urlPath;
}
private static boolean matches(CharSequence cs1, CharSequence cs2) {
if (DYNA_PART.equals(cs1)) {
return true;
}
int len = cs1.length();
if (len != cs2.length()) {
return false;
}
for (int i = len - 1; i >= 0; --i) {
if (cs1.charAt(i) != cs2.charAt(i)) {
return false;
}
}
return true;
}
}