| /******************************************************************************* |
| * Copyright (c) 2006, 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.base.remote; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.StringReader; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Stack; |
| |
| import javax.xml.parsers.ParserConfigurationException; |
| import javax.xml.parsers.SAXParser; |
| import javax.xml.parsers.SAXParserFactory; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.help.internal.search.SearchHit; |
| import org.xml.sax.Attributes; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.helpers.DefaultHandler; |
| |
| /* |
| * Converts search results serialized by the SearchServlet on remote help server |
| * back into model objects. |
| */ |
| public class RemoteSearchParser extends DefaultHandler { |
| |
| private SAXParser parser; |
| private Stack<SearchHit> stack; |
| private List<SearchHit> hits; |
| private StringBuffer summary; |
| |
| /* |
| * Parses the given serialized search hits and returns generated model |
| * objects (SearchHit objects). |
| */ |
| public List<SearchHit> parse(InputStream in, IProgressMonitor monitor) throws ParserConfigurationException, SAXException, IOException { |
| monitor.beginTask("", 1); //$NON-NLS-1$ |
| init(); |
| parser.parse(in, this); |
| monitor.worked(1); |
| monitor.done(); |
| return hits; |
| } |
| |
| /* |
| * Initializes the parser's state for a new search. Must be called |
| * before each parse. |
| */ |
| private void init() throws ParserConfigurationException, SAXException { |
| if (hits == null) { |
| hits = new ArrayList<SearchHit>(); |
| } |
| else if (!hits.isEmpty()) { |
| hits.clear(); |
| } |
| if (stack == null) { |
| stack = new Stack<SearchHit>(); |
| } |
| else if (!stack.isEmpty()) { |
| stack.clear(); |
| } |
| summary = null; |
| if (parser == null) { |
| parser = SAXParserFactory.newInstance().newSAXParser(); |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes) |
| */ |
| @Override |
| public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { |
| if (qName.equals("hit")) { //$NON-NLS-1$ |
| handleHit(attributes); |
| } |
| else if (qName.equals("summary")) { //$NON-NLS-1$ |
| handleSummary(attributes); |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, java.lang.String) |
| */ |
| @Override |
| public void endElement(String uri, String localName, String qName) throws SAXException { |
| if (qName.equals("hit")) { //$NON-NLS-1$ |
| stack.pop(); |
| } |
| else if (qName.equals("summary") && summary != null) { //$NON-NLS-1$ |
| // collect the summary from the buffer |
| SearchHit hit = stack.peek(); |
| hit.setSummary(summary.toString()); |
| summary = null; |
| } |
| } |
| |
| @Override |
| public void characters(char[] ch, int start, int length) throws SAXException { |
| // are we in <summary></summary> elements? |
| if (summary != null) { |
| // if so, add to the buffer |
| summary.append(ch, start, length); |
| } |
| } |
| |
| private void handleHit(Attributes attr) { |
| String href = attr.getValue("href"); //$NON-NLS-1$ |
| String label = attr.getValue("label"); //$NON-NLS-1$ |
| boolean isPotentialHit = (String.valueOf(true).equalsIgnoreCase(attr.getValue("isPotentialHit"))); //$NON-NLS-1$ |
| float score; |
| try { |
| score = Float.parseFloat(attr.getValue("score")); //$NON-NLS-1$ |
| } |
| catch (NumberFormatException e) { |
| // score was probably missing; default to 0 |
| score = 0; |
| } |
| SearchHit hit = new SearchHit(href, label, null, score, null, null, null, isPotentialHit); |
| hits.add(hit); |
| stack.push(hit); |
| } |
| |
| private void handleSummary(Attributes attr) { |
| // prepare the buffer to receive text summary |
| summary = new StringBuffer(); |
| } |
| |
| /* |
| * Note: throws clause does not declare IOException due to a bug in |
| * sun jdk: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6327149 |
| * |
| * @see org.xml.sax.helpers.DefaultHandler#resolveEntity(java.lang.String, java.lang.String) |
| */ |
| @Override |
| public InputSource resolveEntity(String publicId, String systemId) throws SAXException { |
| return new InputSource(new StringReader("")); //$NON-NLS-1$ |
| } |
| } |