| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.jclouds.http.functions; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.jclouds.http.HttpUtils.closeClientButKeepContentStream; |
| import static org.jclouds.util.Closeables2.closeQuietly; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.StringReader; |
| import java.nio.charset.StandardCharsets; |
| |
| import javax.annotation.Resource; |
| |
| import org.jclouds.http.HttpRequest; |
| import org.jclouds.http.HttpResponse; |
| import org.jclouds.javax.annotation.Nullable; |
| import org.jclouds.logging.Logger; |
| import org.jclouds.rest.InvocationContext; |
| import org.jclouds.rest.internal.GeneratedHttpRequest; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.SAXParseException; |
| import org.xml.sax.XMLReader; |
| import org.xml.sax.helpers.DefaultHandler; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Throwables; |
| import org.jclouds.util.Closeables2; |
| |
| /** |
| * This object will parse the body of an HttpResponse and return the result of type <T> back to the |
| * caller. |
| */ |
| public class ParseSax<T> implements Function<HttpResponse, T>, InvocationContext<ParseSax<T>> { |
| |
| @Resource |
| private Logger logger = Logger.NULL; |
| |
| private final XMLReader parser; |
| private final HandlerWithResult<T> handler; |
| private HttpRequest request; |
| |
| public interface Factory { |
| <T> ParseSax<T> create(HandlerWithResult<T> handler); |
| } |
| |
| public ParseSax(XMLReader parser, HandlerWithResult<T> handler) { |
| this.parser = checkNotNull(parser, "parser"); |
| this.handler = checkNotNull(handler, "handler"); |
| } |
| |
| public T apply(HttpResponse from) { |
| try { |
| checkNotNull(from, "http response"); |
| checkNotNull(from.getPayload(), "payload in " + from); |
| } catch (NullPointerException e) { |
| return addDetailsAndPropagate(from, e); |
| } |
| InputStream is = null; |
| try { |
| // debug is more normally set, so trace is more appropriate for |
| // something heavy like this |
| if (from.getStatusCode() >= 300 || logger.isTraceEnabled()) |
| return convertStreamToStringAndParse(from); |
| is = from.getPayload().getInput(); |
| return parse(new InputSource(is)); |
| } catch (RuntimeException e) { |
| return addDetailsAndPropagate(from, e); |
| } finally { |
| Closeables2.closeQuietly(is); |
| from.getPayload().release(); |
| } |
| } |
| |
| private T convertStreamToStringAndParse(HttpResponse response) { |
| String from = null; |
| try { |
| byte[] fromBytes = closeClientButKeepContentStream(response); |
| from = new String(fromBytes, StandardCharsets.UTF_8); |
| validateXml(from); |
| // Use InputStream to skip over byte order mark. |
| return doParse(new InputSource(new ByteArrayInputStream(fromBytes))); |
| } catch (Exception e) { |
| return addDetailsAndPropagate(response, e, from); |
| } |
| } |
| |
| public T parse(String from) { |
| try { |
| validateXml(from); |
| return doParse(new InputSource(new StringReader(from))); |
| } catch (Exception e) { |
| return addDetailsAndPropagate(null, e, from); |
| } |
| } |
| |
| private void validateXml(String from) { |
| checkNotNull(from, "xml string"); |
| checkArgument(from.indexOf('<') >= 0, "not an xml document [%s] ", from); |
| } |
| |
| public T parse(InputStream from) { |
| try { |
| return parse(new InputSource(from)); |
| } finally { |
| closeQuietly(from); |
| } |
| } |
| |
| public T parse(InputSource from) { |
| try { |
| return doParse(from); |
| } catch (Exception e) { |
| return addDetailsAndPropagate(null, e); |
| } |
| } |
| |
| protected T doParse(InputSource from) throws IOException, SAXException { |
| checkNotNull(from, "xml inputsource"); |
| from.setEncoding(StandardCharsets.UTF_8.name()); |
| parser.setContentHandler(getHandler()); |
| // This method should accept documents with a BOM (Byte-order mark) |
| parser.parse(from); |
| return getHandler().getResult(); |
| } |
| |
| public T addDetailsAndPropagate(HttpResponse response, Exception e) { |
| return addDetailsAndPropagate(response, e, null); |
| } |
| |
| public T addDetailsAndPropagate(HttpResponse response, Exception e, @Nullable String text) { |
| StringBuilder message = new StringBuilder(); |
| if (request != null) { |
| message.append("request: ").append(request.getRequestLine()); |
| } |
| if (response != null) { |
| if (message.length() != 0) |
| message.append("; "); |
| message.append("response: ").append(response.getStatusLine()); |
| } |
| if (e instanceof SAXParseException) { |
| SAXParseException parseException = (SAXParseException) e; |
| String systemId = parseException.getSystemId(); |
| if (systemId == null) { |
| systemId = ""; |
| } |
| if (message.length() != 0) |
| message.append("; "); |
| message.append(String.format("error at %d:%d in document %s", parseException.getColumnNumber(), parseException |
| .getLineNumber(), systemId)); |
| } |
| if (text != null) |
| message.append("; source:\n").append(text); |
| if (message.length() != 0) { |
| message.append("; cause: ").append(e.toString()); |
| throw new RuntimeException(message.toString(), e); |
| } else { |
| throw Throwables.propagate(e); |
| } |
| |
| } |
| |
| public HandlerWithResult<T> getHandler() { |
| return handler; |
| } |
| |
| /** |
| * Handler that produces a useable domain object accessible after parsing completes. |
| * |
| */ |
| public abstract static class HandlerWithResult<T> extends DefaultHandler implements |
| InvocationContext<HandlerWithResult<T>> { |
| private HttpRequest request; |
| |
| protected HttpRequest getRequest() { |
| return request; |
| } |
| |
| public abstract T getResult(); |
| |
| @Override |
| public HandlerWithResult<T> setContext(HttpRequest request) { |
| this.request = request; |
| return this; |
| } |
| } |
| |
| public abstract static class HandlerForGeneratedRequestWithResult<T> extends HandlerWithResult<T> { |
| |
| @Override |
| public HandlerForGeneratedRequestWithResult<T> setContext(HttpRequest request) { |
| checkArgument(checkNotNull(request, "request") instanceof GeneratedHttpRequest, "note this handler requires a GeneratedHttpRequest"); |
| super.setContext(request); |
| return this; |
| } |
| |
| @Override |
| protected GeneratedHttpRequest getRequest() { |
| return (GeneratedHttpRequest) super.getRequest(); |
| } |
| } |
| |
| @Override |
| public ParseSax<T> setContext(HttpRequest request) { |
| handler.setContext(request); |
| this.request = request; |
| return this; |
| } |
| } |