Java tutorial
/* Pandoroid Radio - open source pandora.com client for android * Copyright (C) 2011 Andrew Regner <andrew@aregner.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package com.aregner.pandora; import java.io.BufferedInputStream; import java.io.InputStreamReader; import java.io.Reader; import java.net.URI; import java.util.AbstractCollection; import java.util.Iterator; import java.util.Map; import java.util.Vector; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.entity.StringEntity; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserFactory; import org.xmlrpc.android.Tag; import org.xmlrpc.android.XMLRPCException; import org.xmlrpc.android.XMLRPCFault; public class XmlRpc extends org.xmlrpc.android.XMLRPCClient { public XmlRpc(String url) { super(url); } /* This method is extracted from the parent class with slight modifications * for sending a request with a predetermined body content. */ @SuppressWarnings("unchecked") public Object callWithBody(String url, String body) throws XMLRPCException { postMethod.setURI(URI.create(url)); try { // set POST body HttpEntity entity = new StringEntity(body); postMethod.setEntity(entity); //Log.d(Tag.LOG, "ros HTTP POST"); // execute HTTP POST request HttpResponse response = client.execute(postMethod); //Log.d(Tag.LOG, "ros HTTP POSTed"); // check status code int statusCode = response.getStatusLine().getStatusCode(); //Log.d(Tag.LOG, "ros status code:" + statusCode); if (statusCode != HttpStatus.SC_OK) { throw new XMLRPCException("HTTP status code: " + statusCode + " != " + HttpStatus.SC_OK); } // parse response stuff // // setup pull parser XmlPullParser pullParser = XmlPullParserFactory.newInstance().newPullParser(); entity = response.getEntity(); Reader reader = new InputStreamReader(new BufferedInputStream(entity.getContent())); // for testing purposes only // reader = new StringReader("<?xml version='1.0'?><methodResponse><params><param><value>\n\n\n</value></param></params></methodResponse>"); pullParser.setInput(reader); // lets start pulling... pullParser.nextTag(); pullParser.require(XmlPullParser.START_TAG, null, Tag.METHOD_RESPONSE); pullParser.nextTag(); // either Tag.PARAMS (<params>) or Tag.FAULT (<fault>) String tag = pullParser.getName(); if (tag.equals(Tag.PARAMS)) { // normal response pullParser.nextTag(); // Tag.PARAM (<param>) pullParser.require(XmlPullParser.START_TAG, null, Tag.PARAM); pullParser.nextTag(); // Tag.VALUE (<value>) // no parser.require() here since its called in XMLRPCSerializer.deserialize() below // deserialize result Object obj = iXMLRPCSerializer.deserialize(pullParser); entity.consumeContent(); return obj; } else if (tag.equals(Tag.FAULT)) { // fault response pullParser.nextTag(); // Tag.VALUE (<value>) // no parser.require() here since its called in XMLRPCSerializer.deserialize() below // deserialize fault result Map<String, Object> map = (Map<String, Object>) iXMLRPCSerializer.deserialize(pullParser); String faultString = (String) map.get(Tag.FAULT_STRING); int faultCode = (Integer) map.get(Tag.FAULT_CODE); entity.consumeContent(); throw new XMLRPCFault(faultString, faultCode); } else { entity.consumeContent(); throw new XMLRPCException( "Bad tag <" + tag + "> in XMLRPC response - neither <params> nor <fault>"); } } catch (XMLRPCException e) { e.printStackTrace(); // catch & propagate XMLRPCException/XMLRPCFault throw e; } catch (Exception e) { e.printStackTrace(); // wrap any other Exception(s) around XMLRPCException throw new XMLRPCException(e); } } public void addHeader(String header, String value) { postMethod.addHeader(header, value); } public static String value(String v) { return "<value><string>" + v.replace("&", "&").replace("<", "<").replace(">", ">") + "</string></value>"; } public static String value(boolean v) { return v ? "<value><boolean>1</boolean></value>" : "<value><boolean>0</boolean></value>"; } public static String value(int v) { return "<value><int>" + String.valueOf(v) + "</int></value>"; } public static String value(Number v) { return value(v.intValue()); } public static String value(String[] list) { StringBuilder result = new StringBuilder("<value><array><data>"); for (int i = 0; i < list.length; i++) { result.append(value(list[i])); } return result.append("</data></array></value>").toString(); } public static String value(int[] list) { StringBuilder result = new StringBuilder("<value><array><data>"); for (int i = 0; i < list.length; i++) { result.append(value(list[i])); } return result.append("</data></array></value>").toString(); } public static String value(AbstractCollection<?> list) { StringBuilder result = new StringBuilder("<value><array><data>"); Iterator<?> listIter = list.iterator(); while (listIter.hasNext()) { result.append(valueGuess(listIter.next())); } return result.append("</data></array></value>").toString(); } public static String valueGuess(Object v) { if (v instanceof Number) return value((Number) v); else if (v instanceof Boolean) return value((Boolean) v); else if (v instanceof String) return value((String) v); else if (v instanceof AbstractCollection<?>) return value((AbstractCollection<?>) v); else return value(v.toString()); } public static String makeCall(String method, Vector<Object> args) { StringBuilder argsStr = new StringBuilder(); Iterator<Object> argsIter = args.iterator(); while (argsIter.hasNext()) { Object item = argsIter.next(); argsStr.append("<param>").append(valueGuess(item)).append("</param>"); } return "<?xml version=\"1.0\"?><methodCall><methodName>" + method + "</methodName><params>" + argsStr.toString() + "</params></methodCall>"; } }