Java tutorial
/* * Copyright (C) 2009 University of Washington * * Licensed 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 com.amarinfingroup.net.tasks; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.IOException; import java.util.HashMap; import java.util.Map; import org.apache.commons.io.IOUtils; import org.javarosa.core.model.FormDef; import org.javarosa.core.model.FormIndex; import org.javarosa.core.model.instance.InstanceInitializationFactory; import org.javarosa.core.model.instance.TreeElement; import org.javarosa.core.model.instance.TreeReference; import org.javarosa.core.model.instance.utils.DefaultAnswerResolver; import org.javarosa.core.reference.ReferenceManager; import org.javarosa.core.reference.RootTranslator; import org.javarosa.core.util.externalizable.DeserializationException; import org.javarosa.core.util.externalizable.ExtUtil; import org.javarosa.debug.Event; import org.javarosa.debug.EventNotifier; import org.javarosa.form.api.FormEntryController; import org.javarosa.form.api.FormEntryModel; import org.javarosa.xform.parse.XFormParseException; import org.javarosa.xform.parse.XFormParser; import org.javarosa.xform.util.XFormUtils; import org.javarosa.xpath.XPathTypeMismatchException; import com.amarinfingroup.net.R; import com.amarinfingroup.net.application.Collect; import com.amarinfingroup.net.database.ItemsetDbAdapter; import com.amarinfingroup.net.external.ExternalAnswerResolver; import com.amarinfingroup.net.external.ExternalDataHandler; import com.amarinfingroup.net.external.ExternalDataManager; import com.amarinfingroup.net.external.ExternalDataManagerImpl; import com.amarinfingroup.net.external.ExternalDataReader; import com.amarinfingroup.net.external.ExternalDataReaderImpl; import com.amarinfingroup.net.external.handler.ExternalDataHandlerPull; import com.amarinfingroup.net.listeners.FormLoaderListener; import com.amarinfingroup.net.logic.FileReferenceFactory; import com.amarinfingroup.net.logic.FormController; import com.amarinfingroup.net.preferences.AdminPreferencesActivity; import com.amarinfingroup.net.utilities.FileUtils; import com.amarinfingroup.net.utilities.ZipUtils; import android.content.Intent; import android.database.Cursor; import android.os.AsyncTask; import android.util.Log; import au.com.bytecode.opencsv.CSVReader; /** * Background task for loading a form. * * @author Carl Hartung (carlhartung@gmail.com) * @author Yaw Anokwa (yanokwa@gmail.com) */ public class FormLoaderTask extends AsyncTask<String, String, FormLoaderTask.FECWrapper> { private final static String t = "FormLoaderTask"; private static final String ITEMSETS_CSV = "itemsets.csv"; private FormLoaderListener mStateListener; private String mErrorMsg; private String mInstancePath; private final String mXPath; private final String mWaitingXPath; private boolean pendingActivityResult = false; private int requestCode = 0; private int resultCode = 0; private Intent intent = null; private ExternalDataManager externalDataManager; protected class FECWrapper { FormController controller; boolean usedSavepoint; protected FECWrapper(FormController controller, boolean usedSavepoint) { this.controller = controller; this.usedSavepoint = usedSavepoint; } protected FormController getController() { return controller; } protected boolean hasUsedSavepoint() { return usedSavepoint; } protected void free() { controller = null; } } FECWrapper data; public FormLoaderTask(String instancePath, String XPath, String waitingXPath) { mInstancePath = instancePath; mXPath = XPath; mWaitingXPath = waitingXPath; } /** * Initialize {@link FormEntryController} with {@link FormDef} from binary or * from XML. If given an instance, it will be used to fill the {@link FormDef} * . */ @Override protected FECWrapper doInBackground(String... path) { FormEntryController fec = null; FormDef fd = null; FileInputStream fis = null; mErrorMsg = null; String formPath = path[0]; File formXml = new File(formPath); String formHash = FileUtils.getMd5Hash(formXml); File formBin = new File(Collect.CACHE_PATH + File.separator + formHash + ".formdef"); publishProgress(Collect.getInstance().getString(R.string.survey_loading_reading_form_message)); FormDef.EvalBehavior mode = AdminPreferencesActivity .getConfiguredFormProcessingLogic(Collect.getInstance()); FormDef.setEvalBehavior(mode); // FormDef.setDefaultEventNotifier(new EventNotifier() { // // @Override // public void publishEvent(Event event) { // Log.d("FormDef", event.asLogLine()); // } // }); if (formBin.exists()) { // if we have binary, deserialize binary Log.i(t, "Attempting to load " + formXml.getName() + " from cached file: " + formBin.getAbsolutePath()); fd = deserializeFormDef(formBin); if (fd == null) { // some error occured with deserialization. Remove the file, and make a // new .formdef // from xml Log.w(t, "Deserialization FAILED! Deleting cache file: " + formBin.getAbsolutePath()); formBin.delete(); } } if (fd == null) { // no binary, read from xml try { Log.i(t, "Attempting to load from: " + formXml.getAbsolutePath()); fis = new FileInputStream(formXml); fd = XFormUtils.getFormFromInputStream(fis); if (fd == null) { mErrorMsg = "Error reading XForm file"; } else { serializeFormDef(fd, formPath); } } catch (FileNotFoundException e) { e.printStackTrace(); mErrorMsg = e.getMessage(); } catch (XFormParseException e) { mErrorMsg = e.getMessage(); e.printStackTrace(); } catch (Exception e) { mErrorMsg = e.getMessage(); e.printStackTrace(); } finally { IOUtils.closeQuietly(fis); } } if (mErrorMsg != null || fd == null) { return null; } // set paths to /sdcard/odk/forms/formfilename-media/ String formFileName = formXml.getName().substring(0, formXml.getName().lastIndexOf(".")); File formMediaDir = new File(formXml.getParent(), formFileName + "-media"); externalDataManager = new ExternalDataManagerImpl(formMediaDir); // add external data function handlers ExternalDataHandler externalDataHandlerPull = new ExternalDataHandlerPull(externalDataManager); fd.getEvaluationContext().addFunctionHandler(externalDataHandlerPull); try { loadExternalData(formMediaDir); } catch (Exception e) { mErrorMsg = e.getMessage(); e.printStackTrace(); return null; } if (isCancelled()) { // that means that the user has cancelled, so no need to go further return null; } // create FormEntryController from formdef FormEntryModel fem = new FormEntryModel(fd); fec = new FormEntryController(fem); boolean usedSavepoint = false; try { // import existing data into formdef if (mInstancePath != null) { File instance = new File(mInstancePath); File shadowInstance = SaveToDiskTask.savepointFile(instance); if (shadowInstance.exists() && (shadowInstance.lastModified() > instance.lastModified())) { // the savepoint is newer than the saved value of the instance. // use it. usedSavepoint = true; instance = shadowInstance; Log.w(t, "Loading instance from shadow file: " + shadowInstance.getAbsolutePath()); } if (instance.exists()) { // This order is important. Import data, then initialize. try { importData(instance, fec); fd.initialize(false, new InstanceInitializationFactory()); } catch (RuntimeException e) { Log.e(t, e.getMessage(), e); // SCTO-633 if (usedSavepoint && !(e.getCause() instanceof XPathTypeMismatchException)) { // this means that the .save file is corrupted or 0-sized, so // don't use it. usedSavepoint = false; mInstancePath = null; fd.initialize(true, new InstanceInitializationFactory()); } else { // this means that the saved instance is corrupted. throw e; } } } else { fd.initialize(true, new InstanceInitializationFactory()); } } else { fd.initialize(true, new InstanceInitializationFactory()); } } catch (RuntimeException e) { Log.e(t, e.getMessage(), e); if (e.getCause() instanceof XPathTypeMismatchException) { // this is a case of // https://bitbucket.org/m.sundt/javarosa/commits/e5d344783e7968877402bcee11828fa55fac69de // the data are imported, the survey will be unusable // but we should give the option to the user to edit the form // otherwise the survey will be TOTALLY inaccessible. Log.w(t, "We have a syntactically correct instance, but the data threw an exception inside JR. We should allow editing."); } else { mErrorMsg = e.getMessage(); return null; } } // Remove previous forms ReferenceManager._().clearSession(); // for itemsets.csv, we only check to see if the itemset file has been // updated File csv = new File(formMediaDir.getAbsolutePath() + "/" + ITEMSETS_CSV); String csvmd5 = null; if (csv.exists()) { csvmd5 = FileUtils.getMd5Hash(csv); boolean readFile = false; ItemsetDbAdapter ida = new ItemsetDbAdapter(); ida.open(); // get the database entry (if exists) for this itemsets.csv, based // on the path Cursor c = ida.getItemsets(csv.getAbsolutePath()); if (c != null) { if (c.getCount() == 1) { c.moveToFirst(); // should be only one, ever, if any String oldmd5 = c.getString(c.getColumnIndex("hash")); if (oldmd5.equals(csvmd5)) { // they're equal, do nothing } else { // the csv has been updated, delete the old entries ida.dropTable(ItemsetDbAdapter.getMd5FromString(csv.getAbsolutePath()), csv.getAbsolutePath()); // and read the new readFile = true; } } else { // new csv, add it readFile = true; } c.close(); } ida.close(); if (readFile) { readCSV(csv, csvmd5, ItemsetDbAdapter.getMd5FromString(csv.getAbsolutePath())); } } // This should get moved to the Application Class if (ReferenceManager._().getFactories().length == 0) { // this is /sdcard/odk ReferenceManager._().addReferenceFactory(new FileReferenceFactory(Collect.ODK_ROOT)); } // Set jr://... to point to /sdcard/odk/forms/filename-media/ ReferenceManager._().addSessionRootTranslator( new RootTranslator("jr://images/", "jr://file/forms/" + formFileName + "-media/")); ReferenceManager._().addSessionRootTranslator( new RootTranslator("jr://image/", "jr://file/forms/" + formFileName + "-media/")); ReferenceManager._().addSessionRootTranslator( new RootTranslator("jr://audio/", "jr://file/forms/" + formFileName + "-media/")); ReferenceManager._().addSessionRootTranslator( new RootTranslator("jr://video/", "jr://file/forms/" + formFileName + "-media/")); // clean up vars fis = null; fd = null; formBin = null; formXml = null; formPath = null; FormController fc = new FormController(formMediaDir, fec, mInstancePath == null ? null : new File(mInstancePath)); if (mXPath != null) { // we are resuming after having terminated -- set index to this // position... FormIndex idx = fc.getIndexFromXPath(mXPath); fc.jumpToIndex(idx); } if (mWaitingXPath != null) { FormIndex idx = fc.getIndexFromXPath(mWaitingXPath); fc.setIndexWaitingForData(idx); } data = new FECWrapper(fc, usedSavepoint); return data; } @SuppressWarnings("unchecked") private void loadExternalData(File mediaFolder) { // SCTO-594 File[] zipFiles = mediaFolder.listFiles(new FileFilter() { @Override public boolean accept(File file) { return file.getName().toLowerCase().endsWith(".zip"); } }); if (zipFiles != null) { ZipUtils.unzip(zipFiles); for (File zipFile : zipFiles) { boolean deleted = zipFile.delete(); if (!deleted) { Log.w(t, "Cannot delete " + zipFile + ". It will be re-unzipped next time. :("); } } } File[] csvFiles = mediaFolder.listFiles(new FileFilter() { @Override public boolean accept(File file) { String lowerCaseName = file.getName().toLowerCase(); return lowerCaseName.endsWith(".csv") && !lowerCaseName.equalsIgnoreCase(ITEMSETS_CSV); } }); Map<String, File> externalDataMap = new HashMap<String, File>(); if (csvFiles != null) { for (File csvFile : csvFiles) { String dataSetName = csvFile.getName().substring(0, csvFile.getName().lastIndexOf(".")); externalDataMap.put(dataSetName, csvFile); } if (externalDataMap.size() > 0) { publishProgress(Collect.getInstance().getString(R.string.survey_loading_reading_csv_message)); ExternalDataReader externalDataReader = new ExternalDataReaderImpl(this); externalDataReader.doImport(externalDataMap); } } } public void publishExternalDataLoadingProgress(String message) { publishProgress(message); } @Override protected void onProgressUpdate(String... values) { synchronized (this) { if (mStateListener != null && values != null) { if (values.length == 1) { mStateListener.onProgressStep(values[0]); } } } } public boolean importData(File instanceFile, FormEntryController fec) { publishProgress(Collect.getInstance().getString(R.string.survey_loading_reading_data_message)); // convert files into a byte array byte[] fileBytes = FileUtils.getFileAsBytes(instanceFile); // get the root of the saved and template instances TreeElement savedRoot = XFormParser.restoreDataModel(fileBytes, null).getRoot(); TreeElement templateRoot = fec.getModel().getForm().getInstance().getRoot().deepCopy(true); // weak check for matching forms if (!savedRoot.getName().equals(templateRoot.getName()) || savedRoot.getMult() != 0) { Log.e(t, "Saved form instance does not match template form definition"); return false; } else { // populate the data model TreeReference tr = TreeReference.rootRef(); tr.add(templateRoot.getName(), TreeReference.INDEX_UNBOUND); // Here we set the Collect's implementation of the IAnswerResolver. // We set it back to the default after select choices have been populated. XFormParser.setAnswerResolver(new ExternalAnswerResolver()); templateRoot.populate(savedRoot, fec.getModel().getForm()); XFormParser.setAnswerResolver(new DefaultAnswerResolver()); // populated model to current form fec.getModel().getForm().getInstance().setRoot(templateRoot); // fix any language issues // : // http://bitbucket.org/javarosa/main/issue/5/itext-n-appearing-in-restored-instances if (fec.getModel().getLanguages() != null) { fec.getModel().getForm().localeChanged(fec.getModel().getLanguage(), fec.getModel().getForm().getLocalizer()); } return true; } } /** * Read serialized {@link FormDef} from file and recreate as object. * * @param formDef * serialized FormDef file * @return {@link FormDef} object */ public FormDef deserializeFormDef(File formDef) { // TODO: any way to remove reliance on jrsp? FileInputStream fis = null; FormDef fd = null; try { // create new form def fd = new FormDef(); fis = new FileInputStream(formDef); DataInputStream dis = new DataInputStream(fis); // read serialized formdef into new formdef fd.readExternal(dis, ExtUtil.defaultPrototypes()); dis.close(); } catch (FileNotFoundException e) { e.printStackTrace(); fd = null; } catch (IOException e) { e.printStackTrace(); fd = null; } catch (DeserializationException e) { e.printStackTrace(); fd = null; } catch (Exception e) { e.printStackTrace(); fd = null; } return fd; } /** * Write the FormDef to the file system as a binary blog. * * @param filepath * path to the form file */ public void serializeFormDef(FormDef fd, String filepath) { // calculate unique md5 identifier String hash = FileUtils.getMd5Hash(new File(filepath)); File formDef = new File(Collect.CACHE_PATH + File.separator + hash + ".formdef"); // formdef does not exist, create one. if (!formDef.exists()) { FileOutputStream fos; try { fos = new FileOutputStream(formDef); DataOutputStream dos = new DataOutputStream(fos); fd.writeExternal(dos); dos.flush(); dos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } @Override protected void onCancelled() { super.onCancelled(); if (externalDataManager != null) { externalDataManager.close(); } } @Override protected void onPostExecute(FECWrapper wrapper) { synchronized (this) { try { if (mStateListener != null) { if (wrapper == null) { mStateListener.loadingError(mErrorMsg); } else { mStateListener.loadingComplete(this); } } } catch (Exception e) { e.printStackTrace(); } } } public void setFormLoaderListener(FormLoaderListener sl) { synchronized (this) { mStateListener = sl; } } public FormController getFormController() { return (data != null) ? data.getController() : null; } public ExternalDataManager getExternalDataManager() { return externalDataManager; } public boolean hasUsedSavepoint() { return (data != null) ? data.hasUsedSavepoint() : false; } public void destroy() { if (data != null) { data.free(); data = null; } } public boolean hasPendingActivityResult() { return pendingActivityResult; } public int getRequestCode() { return requestCode; } public int getResultCode() { return resultCode; } public Intent getIntent() { return intent; } public void setActivityResult(int requestCode, int resultCode, Intent intent) { this.pendingActivityResult = true; this.requestCode = requestCode; this.resultCode = resultCode; this.intent = intent; } private void readCSV(File csv, String formHash, String pathHash) { CSVReader reader; ItemsetDbAdapter ida = new ItemsetDbAdapter(); ida.open(); boolean withinTransaction = false; try { reader = new CSVReader(new FileReader(csv)); String[] nextLine; String[] columnHeaders = null; int lineNumber = 0; while ((nextLine = reader.readNext()) != null) { lineNumber++; if (lineNumber == 1) { // first line of csv is column headers columnHeaders = nextLine; ida.createTable(formHash, pathHash, columnHeaders, csv.getAbsolutePath()); continue; } // add the rest of the lines to the specified database // nextLine[] is an array of values from the line // System.out.println(nextLine[4] + "etc..."); if (lineNumber == 2) { // start a transaction for the inserts withinTransaction = true; ida.beginTransaction(); } ida.addRow(pathHash, columnHeaders, nextLine); } } catch (IOException e) { e.printStackTrace(); } finally { if (withinTransaction) { ida.commit(); } ida.close(); } } }