| /******************************************************************************* |
| * Copyright (c) 2000, 2015 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.help.internal.search; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.net.URLEncoder; |
| |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.help.IHelpResource; |
| import org.eclipse.help.internal.base.HelpBaseResources; |
| import org.eclipse.help.search.ISearchEngine; |
| import org.eclipse.help.search.ISearchEngineResult; |
| import org.eclipse.help.search.ISearchEngineResultCollector; |
| import org.eclipse.help.search.ISearchScope; |
| |
| /** |
| * This implementation of <code>ISearchEngine</code> interface performs search |
| * by running a query on the remote web site using the provided query URL. |
| * Instances of this engine type are required to supply the URL template with |
| * the query string replaced with the substitution string |
| * <code>{expression}</code>. |
| * <p> |
| * This class is made public in order to be instantiated and parametrized |
| * directly in the extensions. Clients are required to supply the URL template |
| * string as a parameter <code>url</code>. |
| * |
| * <p> |
| * This class is not expected to be subclassed or otherwise accessed |
| * programmatically. |
| * |
| * @since 3.1 |
| */ |
| public final class WebSearch implements ISearchEngine { |
| private static final char C_START = '{'; |
| |
| private static final char C_STOP = '}'; |
| |
| public static class Scope implements ISearchScope { |
| private String urlTemplate; |
| |
| public Scope(String urlTemplate) { |
| this.urlTemplate = urlTemplate; |
| } |
| |
| public String getURLTemplate() { |
| return urlTemplate; |
| } |
| } |
| |
| private static class SearchResult implements ISearchEngineResult { |
| private String query; |
| |
| private String urlTemplate; |
| |
| public SearchResult(String query, String urlTemplate) { |
| this.query = query; |
| this.urlTemplate = urlTemplate; |
| } |
| |
| @Override |
| public String getDescription() { |
| return HelpBaseResources.WebSearch_click; |
| } |
| |
| @Override |
| public String getHref() { |
| String href = null; |
| String equery; |
| try { |
| equery = URLEncoder.encode(query, "UTF-8"); //$NON-NLS-1$ |
| |
| } catch (UnsupportedEncodingException e) { |
| equery = query; |
| } |
| href = composeURL(equery, urlTemplate); |
| return href; |
| } |
| |
| @Override |
| public String getLabel() { |
| return HelpBaseResources.WebSearch_label; |
| } |
| |
| @Override |
| public float getScore() { |
| return 1; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.help.internal.search.federated.ISearchEngineResult#getCategory() |
| */ |
| @Override |
| public IHelpResource getCategory() { |
| return null; |
| } |
| |
| @Override |
| public boolean getForceExternalWindow() { |
| return true; |
| } |
| |
| @Override |
| public String toAbsoluteHref(String href, boolean frames) { |
| return href; |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.help.internal.search.federated.ISearchEngine#run(java.lang.String, |
| * org.eclipse.help.internal.search.ISearchScope, |
| * org.eclipse.help.internal.search.federated.ISearchEngineResultCollector, |
| * org.eclipse.core.runtime.IProgressMonitor) |
| */ |
| @Override |
| public void run(String query, ISearchScope scope, |
| ISearchEngineResultCollector collector, IProgressMonitor monitor) |
| throws CoreException { |
| |
| collector |
| .accept(new SearchResult(query, ((Scope) scope).getURLTemplate())); |
| } |
| |
| private static String composeURL(String query, String urlTemplate) { |
| StringBuilder result = new StringBuilder(); |
| boolean inSubstitution = false; |
| int varStart = -1; |
| for (int i = 0; i < urlTemplate.length(); i++) { |
| char c = urlTemplate.charAt(i); |
| if (c == C_START && !inSubstitution) { |
| if (i < urlTemplate.length() - 1) { |
| // look ahead |
| char c2 = urlTemplate.charAt(i + 1); |
| if (c2 == C_START) { |
| result.append(c); |
| i++; |
| continue; |
| } |
| } |
| inSubstitution = true; |
| varStart = i; |
| continue; |
| } else if (c == C_STOP && inSubstitution) { |
| if (i < urlTemplate.length() - 1) { |
| // look ahead |
| char c2 = urlTemplate.charAt(i + 1); |
| if (c2 == C_STOP) { |
| result.append(c); |
| i++; |
| continue; |
| } |
| } |
| if (varStart != -1) { |
| String key = urlTemplate.substring(varStart + 1, i); |
| String value = getVariable(key, query); |
| result.append(value); |
| } |
| inSubstitution = false; |
| } else if (!inSubstitution) { |
| result.append(c); |
| } |
| } |
| return result.toString(); |
| } |
| |
| private static String getVariable(String key, String query) { |
| if (key.equals("expression")) //$NON-NLS-1$ |
| return query; |
| return key; |
| } |
| } |