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/*******************************************************************************
 * Copyright (c) 2015 Sierra Wireless and others.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 * 
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *    http://www.eclipse.org/org/documents/edl-v10.html.
 * 
 * Contributors:
 *     Sierra Wireless - initial API and implementation
 *******************************************************************************/
package org.eclipse.leshan.client.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.leshan.Link;
import org.eclipse.leshan.LwM2mId;
import org.eclipse.leshan.client.resource.LwM2mObjectEnabler;
import org.eclipse.leshan.core.model.LwM2mModel;
import org.eclipse.leshan.core.model.ObjectModel;
import org.eclipse.leshan.core.model.ResourceModel;

/**
 * An Utility class which help to generate @{link Link} from {@link LwM2mObjectEnabler} and {@link LwM2mModel}.
* Used for register and discover payload. */ public final class LinkFormatHelper { private LinkFormatHelper() { } public static Link[] getClientDescription(Collection objectEnablers, String rootPath) { List links = new ArrayList<>(); // clean root path String root = rootPath == null ? "" : rootPath; // create links for "object" String rootURL = getPath("/", root); Map attributes = new HashMap<>(); attributes.put("rt", "oma.lwm2m"); links.add(new Link(rootURL, attributes)); // sort resources List objEnablerList = new ArrayList<>(objectEnablers); Collections.sort(objEnablerList, new Comparator() { @Override public int compare(LwM2mObjectEnabler o1, LwM2mObjectEnabler o2) { return o1.getId() - o2.getId(); } }); for (LwM2mObjectEnabler objectEnabler : objEnablerList) { // skip the security Object if (objectEnabler.getId() == LwM2mId.SECURITY) continue; List availableInstance = objectEnabler.getAvailableInstanceIds(); if (availableInstance.isEmpty()) { String objectInstanceUrl = getPath("/", root, Integer.toString(objectEnabler.getId())); links.add(new Link(objectInstanceUrl)); } else { for (Integer instanceId : objectEnabler.getAvailableInstanceIds()) { String objectInstanceUrl = getPath("/", root, Integer.toString(objectEnabler.getId()), instanceId.toString()); links.add(new Link(objectInstanceUrl)); } } } return links.toArray(new Link[] {}); } public static Link[] getObjectDescription(ObjectModel objectModel, String root) { List links = new ArrayList<>(); // clean root path String rootPath = root == null ? "" : root; // create link for "object" String objectURL = getPath("/", rootPath, Integer.toString(objectModel.id)); links.add(new Link(objectURL)); // sort resources List resources = new ArrayList<>(objectModel.resources.values()); Collections.sort(resources, new Comparator() { @Override public int compare(ResourceModel o1, ResourceModel o2) { return o1.id - o2.id; } }); // create links for resource for (ResourceModel resourceModel : resources) { String resourceURL = getPath("/", rootPath, Integer.toString(objectModel.id), "0", Integer.toString(resourceModel.id)); links.add(new Link(resourceURL)); } return links.toArray(new Link[] {}); } public static Link getInstanceDescription(ObjectModel objectModel, int instanceId, String root) { // clean root path String rootPath = root == null ? "" : root; // create link for "instance" String objectURL = getPath("/", rootPath, Integer.toString(objectModel.id), Integer.toString(instanceId)); return new Link(objectURL); } public static Link getResourceDescription(int objectId, int instanceId, ResourceModel resourceModel, String root) { // clean root path String rootPath = root == null ? "" : root; // create link for "resource" String objectURL = getPath("/", rootPath, Integer.toString(objectId), Integer.toString(instanceId), Integer.toString(resourceModel.id)); return new Link(objectURL); } private static final String getPath(String first, String... more) { String path; if (more.length == 0) { path = first; } else { StringBuilder sb = new StringBuilder(); sb.append(first); for (String segment : more) { if (segment.length() > 0) { if (sb.length() > 0) sb.append('/'); sb.append(segment); } } path = sb.toString(); } return normalizeAndCheck(path); } private static String normalizeAndCheck(String input) { int n = input.length(); char prevChar = 0; for (int i = 0; i < n; i++) { char c = input.charAt(i); if ((c == '/') && (prevChar == '/')) return normalize(input, n, i - 1); checkNotNul(c); prevChar = c; } if (prevChar == '/') return normalize(input, n, n - 1); return input; } private static void checkNotNul(char c) { if (c == '\u0000') throw new IllegalArgumentException("Nul character not allowed in path"); } private static String normalize(String input, int len, int off) { if (len == 0) return input; int n = len; while ((n > 0) && (input.charAt(n - 1) == '/')) n--; if (n == 0) return "/"; StringBuilder sb = new StringBuilder(input.length()); if (off > 0) sb.append(input.substring(0, off)); char prevChar = 0; for (int i = off; i < n; i++) { char c = input.charAt(i); if ((c == '/') && (prevChar == '/')) continue; checkNotNul(c); sb.append(c); prevChar = c; } return sb.toString(); } }




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