From 8e58edd3a64e784f23f2582b32851a01d7905f47 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Mon, 9 Mar 2009 15:43:58 +0100
Subject: [PATCH] First implementation of the Arachne core.

---
 src/net/pterodactylus/arachne/core/Core.java | 137 +++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 src/net/pterodactylus/arachne/core/Core.java

diff --git a/src/net/pterodactylus/arachne/core/Core.java b/src/net/pterodactylus/arachne/core/Core.java
new file mode 100644
index 0000000..f3fd5de
--- /dev/null
+++ b/src/net/pterodactylus/arachne/core/Core.java
@@ -0,0 +1,137 @@
+/*
+ * © 2009 David ‘Bombe’ Roden
+ */
+package net.pterodactylus.arachne.core;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import de.ina.util.service.AbstractService;
+import de.ina.util.validation.Validation;
+
+/**
+ * Arachne’s core.
+ *
+ * @author David ‘Bombe’ Roden <bombe@pterodactylus.net>
+ */
+public class Core extends AbstractService {
+
+	//
+	// PROPERTIES
+	//
+
+	/** The host of the freenet node. */
+	private String nodeHost = "localhost";
+
+	/** The port of the freenet node. */
+	private int nodePort = 8888;
+
+	//
+	// INTERNAL MEMBERS
+	//
+
+	/** The current list of URLs to crawl. */
+	private final List<Page> pages = Collections.synchronizedList(new ArrayList<Page>());
+
+	//
+	// ACTIONS
+	//
+
+	/**
+	 * Adds the given URL to the list of pages to crawl.
+	 *
+	 * @param url
+	 *            The URL to add
+	 */
+	public void addPage(URL url) {
+		Validation.begin().isNotNull("url", url).check().isEqual("url.getHost()", url.getHost(), (Object) nodeHost).isEqual("url.getPort()", url.getPort(), nodePort).check();
+		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));
+			addPage(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));
+			addPage(page);
+		}
+		/* TODO: handle CHK */
+	}
+
+	/**
+	 * Adds the given URL to the list of pages to crawl.
+	 *
+	 * @param url
+	 *            The URL of the page to crawl
+	 * @throws MalformedURLException
+	 *             if the URL is not a valid URL
+	 */
+	public void addPage(String url) throws MalformedURLException {
+		Validation.begin().isNotNull("url", (Object) url).check();
+		addPage(new URL(url));
+	}
+
+	/**
+	 * Adds the given page to the list of pages to crawl.
+	 *
+	 * @param page
+	 *            The page to add
+	 */
+	public void addPage(Page page) {
+		Validation.begin().isNotNull("page", page).check();
+		pages.add(page);
+		notifySyncObject();
+	}
+
+	//
+	// 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 String createPath(String[] pathComponents, int index) {
+		Validation.begin().isNotNull("pathComponents", pathComponents).check().isLess("index", pathComponents.length, index).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();
+	}
+
+}
-- 
2.7.4