Java tutorial
/** * Copyright (C) cedarsoft GmbH. * * Licensed under the GNU General Public License version 3 (the "License") * with Classpath Exception; you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.cedarsoft.org/gpl3ce * (GPL 3 with Classpath Exception) * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 3 only, as * published by the Free Software Foundation. cedarsoft GmbH designates this * particular file as subject to the "Classpath" exception as provided * by cedarsoft GmbH in the LICENSE file that accompanied this code. * * This code 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 * version 3 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 3 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact cedarsoft GmbH, 72810 Gomaringen, Germany, * or visit www.cedarsoft.com if you need additional information or * have any questions. */ package com.cedarsoft.couchdb.io; import com.cedarsoft.couchdb.core.ActionFailedException; import com.cedarsoft.couchdb.core.ActionResponse; import com.cedarsoft.couchdb.core.DocId; import com.cedarsoft.couchdb.core.Revision; import com.cedarsoft.couchdb.core.UniqueId; import com.cedarsoft.serialization.jackson.JacksonParserWrapper; import com.cedarsoft.serialization.jackson.JacksonSupport; import com.cedarsoft.version.VersionException; import com.fasterxml.jackson.core.JsonFactory; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.core.JsonToken; import com.sun.jersey.api.client.ClientResponse; import org.apache.commons.io.input.TeeInputStream; import javax.annotation.Nonnull; import javax.annotation.WillClose; import javax.annotation.WillNotClose; import javax.ws.rs.core.MediaType; import java.io.IOException; import java.io.InputStream; public class ActionResponseSerializer { /** * Creates a new action response based on the given client response * * @param response the client response * @return the action response * * @throws ActionFailedException if there has been an error */ @Nonnull public static ActionResponse create(@WillClose @Nonnull ClientResponse response) throws ActionFailedException { try { verifyNoError(response); return new ActionResponseSerializer().deserialize(response); } finally { response.close(); } } /** * Throws an exception if the response contains a value * * @param response the response * @throws ActionFailedException */ public static void verifyNoError(@WillNotClose @Nonnull ClientResponse response) throws ActionFailedException { if (!ActionResponse.isNotSuccessful(response)) { return; } if (!response.hasEntity()) { throw new ActionFailedException(response.getStatus(), "unknown", "unknown", null); } try { try (InputStream inputStream = response.getEntityInputStream()) { throw new ActionFailedExceptionSerializer().deserialize(response.getStatus(), inputStream); } } catch (IOException e) { throw new RuntimeException(e); } } public static final String PROPERTY_ID = "id"; public static final String PROPERTY_REV = "rev"; public static final String PROPERTY_OK = "ok"; @Nonnull public ActionResponse deserialize(@Nonnull ClientResponse response) throws VersionException { if (!MediaType.APPLICATION_JSON_TYPE.equals(response.getType())) { throw new IllegalStateException("Invalid media type: " + response.getType()); } InputStream entityInputStream = response.getEntityInputStream(); try { //Wrap the input stream try (MaxLengthByteArrayOutputStream teedOut = new MaxLengthByteArrayOutputStream(); TeeInputStream teeInputStream = new TeeInputStream(entityInputStream, teedOut)) { UniqueId uniqueId = deserialize(teeInputStream); return new ActionResponse(uniqueId, response.getStatus(), response.getLocation(), teedOut.toByteArray()); } } catch (IOException e) { throw new RuntimeException(e); } } @Nonnull public UniqueId deserialize(@Nonnull InputStream in) throws VersionException, IOException { JsonFactory jsonFactory = JacksonSupport.getJsonFactory(); JsonParser parser = jsonFactory.createJsonParser(in); JacksonParserWrapper parserWrapper = new JacksonParserWrapper(parser); parserWrapper.nextToken(JsonToken.START_OBJECT); UniqueId deserialized = deserialize(parser); parserWrapper.ensureObjectClosed(); return deserialized; } @Nonnull public UniqueId deserialize(@Nonnull JsonParser deserializeFrom) throws VersionException, IOException { JacksonParserWrapper parser = new JacksonParserWrapper(deserializeFrom); String id = null; String rev = null; while (parser.nextToken() == JsonToken.FIELD_NAME) { String currentName = parser.getCurrentName(); if (currentName.equals(PROPERTY_OK)) { parser.nextToken(JsonToken.VALUE_TRUE); //we don't need that value continue; } if (currentName.equals(PROPERTY_ID)) { parser.nextToken(JsonToken.VALUE_STRING); id = deserializeFrom.getText(); continue; } if (currentName.equals(PROPERTY_REV)) { parser.nextToken(JsonToken.VALUE_STRING); rev = deserializeFrom.getText(); continue; } throw new IllegalStateException("Unexpected field reached <" + currentName + ">"); } parser.verifyDeserialized(id, PROPERTY_ID); parser.verifyDeserialized(rev, PROPERTY_REV); assert rev != null; assert id != null; parser.ensureObjectClosed(); return new UniqueId(new DocId(id), new Revision(rev)); // AbstractJacksonSerializer.nextToken( deserializeFrom, JsonToken.FIELD_NAME ); // if ( deserializeFrom.getCurrentName().equals( PROPERTY_OK ) ) { // } else { // AbstractJacksonSerializer.nextToken( deserializeFrom, JsonToken.VALUE_STRING ); // String error = deserializeFrom.getText(); // AbstractJacksonSerializer.nextFieldValue( deserializeFrom, PROPERTY_REASON ); // String reason = deserializeFrom.getText(); // AbstractJacksonSerializer.closeObject( deserializeFrom ); // return new ActionResponse( new ActionResponse.Error( error, reason ) ); // } } }