X-Git-Url: https://git.pterodactylus.net/?p=arachne.git;a=blobdiff_plain;f=src%2Fnet%2Fpterodactylus%2Farachne%2Fcore%2FPage.java;fp=src%2Fnet%2Fpterodactylus%2Farachne%2Fcore%2FPage.java;h=2651de0d70075d0b724677a4d807825c114abda4;hp=0a94be7346ed2a2f1d6c1aadfaf3293ef0a05961;hb=c85307a32e0957c15233b4d9ead5f58d8d167244;hpb=cb88a7c9368c4bc32ba5c6caf32c5c51110fde35

diff --git a/src/net/pterodactylus/arachne/core/Page.java b/src/net/pterodactylus/arachne/core/Page.java
index 0a94be7..2651de0 100644
--- a/src/net/pterodactylus/arachne/core/Page.java
+++ b/src/net/pterodactylus/arachne/core/Page.java
@@ -3,6 +3,11 @@
  */
 package net.pterodactylus.arachne.core;
 
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import de.ina.util.validation.Validation;
+
 /**
  * Container for a page. A page consists of an {@link Edition} and a path within
  * the edition.
@@ -48,6 +53,100 @@ public class Page {
 		return path;
 	}
 
+	/**
+	 * Creates a URL from the given page.
+	 *
+	 * @param host
+	 *            The host of the URL
+	 * @param port
+	 *            The port number of the URL
+	 * @return The created URL, or <code>null</code> if the URL could not be
+	 *         created
+	 */
+	public URL toURL(String host, int port) {
+		try {
+			return new URL("http://" + host + ":" + port + "/SSK@" + getEdition().getSite().getKey() + "/" + getEdition().getSite().getBasename() + "-" + getEdition().getNumber() + "/" + getPath());
+		} catch (MalformedURLException mue1) {
+			/* nearly impossible. */
+		}
+		return null;
+	}
+
+	//
+	// STATIC METHODS
+	//
+
+	/**
+	 * Creates a page from the given URL.
+	 *
+	 * @param url
+	 *            The URL to create a page from
+	 * @return The created page, or <code>null</code> if the page could not be
+	 *         created
+	 */
+	public static Page fromURL(URL url) {
+		String path = url.getPath();
+		if (path.length() == 0) {
+			path = "/";
+		}
+		String[] pathComponents = path.split("/");
+		if (pathComponents.length < 2) {
+			throw new IllegalArgumentException("URL “" + url + "” is not a valid freenet page.");
+		}
+		String siteName = pathComponents[1];
+		String[] siteComponents = siteName.split("@");
+		if (siteComponents.length != 2) {
+			throw new IllegalArgumentException("siteName “" + siteName + "” is not a valid freenet page.");
+		}
+		if (!"USK".equals(siteComponents[0]) && !"SSK".equals(siteComponents[0]) && !"CHK".equals(siteComponents[0])) {
+			throw new IllegalArgumentException("siteName “" + siteName + "” is not a valid freenet page.");
+		}
+		if ("USK".equals(siteComponents[0])) {
+			Site site = new Site(siteComponents[1], pathComponents[2]);
+			Edition edition = new Edition(site, Integer.parseInt(pathComponents[3]));
+			Page page = new Page(edition, createPath(pathComponents, 4));
+			return page;
+		}
+		if ("SSK".equals(siteComponents[0])) {
+			int lastDash = pathComponents[2].lastIndexOf('-');
+			String basename = pathComponents[2].substring(0, lastDash);
+			int editionNumber = Integer.parseInt(pathComponents[2].substring(lastDash + 1));
+			Site site = new Site(siteComponents[1], basename);
+			Edition edition = new Edition(site, editionNumber);
+			Page page = new Page(edition, createPath(pathComponents, 3));
+			return page;
+		}
+		/* TODO: handle CHK */
+		return null;
+	}
+
+	//
+	// PRIVATE METHODS
+	//
+
+	/**
+	 * Creates a path from the given String array, starting at the given index.
+	 * The path is created by joining all Strings from the array, separating
+	 * them with a slash (‘/’).
+	 *
+	 * @param pathComponents
+	 *            The array of path components
+	 * @param index
+	 *            The index of the first path components
+	 * @return The joined path
+	 */
+	private static String createPath(String[] pathComponents, int index) {
+		Validation.begin().isNotNull("pathComponents", pathComponents).check().isLessOrEqual("index", index, pathComponents.length).check();
+		StringBuilder path = new StringBuilder();
+		for (int pathComponentIndex = index; pathComponentIndex < pathComponents.length; pathComponentIndex++) {
+			if (path.length() > 0) {
+				path.append('/');
+			}
+			path.append(pathComponents[pathComponentIndex]);
+		}
+		return path.toString();
+	}
+
 	//
 	// OBJECT METHODS
 	//