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The AceQL Java Client SDK allows to wrap the AceQL HTTP APIs and eliminate the tedious works of handling communications errors and parsing JSON results.
Android and Java Desktop application developers can access remote SQL databases and/or SQL databases in the cloud by simply including standard JDBC calls in their code, just like they would for a local database.
/*
* This file is part of AceQL Client SDK.
* AceQL Client SDK: Remote JDBC access over HTTP with AceQL HTTP.
* Copyright (C) 2017, KawanSoft SAS
* (http://www.kawansoft.com). All rights reserved.
*
* 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.aceql.client.jdbc.http;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.ProtocolException;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.io.IOUtils;
import com.aceql.client.jdbc.AceQLException;
/**
* @author Nicolas de Pomereu
*
* AceQL Rest wrapper for AceQL http/REST apis that take care of all
* http calls and operations.
*
* All Exceptions are trapped with a {#link AceQLException} that allows
* to retrieve the detail of the Exceptions
*/
public class AceQLHttpApi {
public static boolean DEBUG = false;
private static boolean TRACE_ON = false;
// Says if session is stateless
private static boolean stateless = false;
// private values
private String serverUrl;
private String username;
private char[] password;
private String database;
/** Proxy to use with HttpUrlConnection */
private Proxy proxy = null;
/** For authenticated proxy */
private PasswordAuthentication passwordAuthentication = null;
private static int connectTimeout = 0;
private static int readTimeout = 0;
private boolean prettyPrinting = false;
private boolean gzipResult = true;
private String url = null;
private int httpStatusCode = HttpURLConnection.HTTP_OK;
private String httpStatusMessage;
private AtomicBoolean cancelled;
private AtomicInteger progress;
/**
* Says if session is stateless.
*
* @return {@code true} if session is stateless, else {@code false}.
*/
public static boolean isStateless() {
return stateless;
}
/**
* Sets the session mode
*
* @param stateless
* if true, the session will be stateless, else stateful.
*/
public static void setStateless(boolean stateless) {
AceQLHttpApi.stateless = stateless;
}
/**
* Sets the read timeout.
*
* @param readTimeout
* an int that specifies the read timeout value, in
* milliseconds, to be used when an http connection is
* established to the remote server. See
* {@link URLConnection#setReadTimeout(int)}
*/
public static void setReadTimeout(int readTimeout) {
AceQLHttpApi.readTimeout = readTimeout;
}
/**
* Sets the connect timeout.
*
* @param connectTimeout
* Sets a specified timeout value, in milliseconds, to be used
* when opening a communications link to the remote server. If
* the timeout expires before the connection can be established,
* a java.net.SocketTimeoutException is raised. A timeout of zero
* is interpreted as an infinite timeout. See
* {@link URLConnection#setConnectTimeout(int)}
*/
public static void setConnectTimeout(int connectTimeout) {
AceQLHttpApi.connectTimeout = connectTimeout;
}
/**
* Login on the AceQL server and connect to a database
*
* @param serverUrl
* the url of the AceQL server. Example:
* http://localhost:9090/aceql
* @param database
* the server database to connect to.
* @param username
* the login
* @param password
* the password
* @param proxy
* the proxy to use. null if none.
* @param passwordAuthentication
* the username and password holder to use for authenticated
* proxy. Null if no proxy or if proxy
* @throws AceQLException
* if any Exception occurs
*/
public AceQLHttpApi(String serverUrl, String database, String username,
char[] password, Proxy proxy,
PasswordAuthentication passwordAuthentication) throws AceQLException {
try {
if (database == null) {
throw new NullPointerException("database is null!");
}
if (serverUrl == null) {
throw new NullPointerException("serverUrl is null!");
}
if (username == null) {
throw new NullPointerException("username is null!");
}
if (password == null) {
throw new NullPointerException("password is null!");
}
this.serverUrl = serverUrl;
this.username = username;
this.password = password;
this.database = database;
this.proxy = proxy;
this.passwordAuthentication = passwordAuthentication;
setProxyCredentials();
String url = serverUrl + "/database/" + database + "/username/"
+ username + "/connect" + "?password=" + new String(password)
+ "&stateless=" + stateless;
String result = callWithGet(url);
trace("result: " + result);
ResultAnalyzer resultAnalyzer = new ResultAnalyzer(result,
httpStatusCode, httpStatusMessage);
if (!resultAnalyzer.isStatusOk()) {
throw new AceQLException(resultAnalyzer.getErrorMessage(),
resultAnalyzer.getErrorType(), null,
resultAnalyzer.getStackTrace(), httpStatusCode);
}
trace("Ok. Connected! ");
String sessionId = resultAnalyzer.getValue("session_id");
trace("sessionId: " + sessionId);
this.url = serverUrl + "/session/" + sessionId + "/";
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
/**
* Login on the AceQL server and connect to a database
*
* @param serverUrl
* the url of the AceQL server. Example:
* http://localhost:9090/aceql
* @param username
* the login
* @param password
* the password
* @param database
* the server database to connect to.
* @throws AceQLException
* if any Exception occurs
*/
public AceQLHttpApi(String serverUrl, String database, String username,
char[] password) throws AceQLException {
this(serverUrl, database, username, password, null, null);
}
public void trace() {
if (TRACE_ON) {
System.out.println();
}
}
public void trace(String s) {
if (TRACE_ON) {
System.out.println(s);
}
}
private void callApiNoResult(String commandName, String commandOption)
throws AceQLException {
try {
if (commandName == null) {
throw new NullPointerException("commandName is null!");
}
String result = callWithGet(commandName, commandOption);
ResultAnalyzer resultAnalyzer = new ResultAnalyzer(result,
httpStatusCode, httpStatusMessage);
if (!resultAnalyzer.isStatusOk()) {
throw new AceQLException(resultAnalyzer.getErrorMessage(),
resultAnalyzer.getErrorType(), null,
resultAnalyzer.getStackTrace(), httpStatusCode);
}
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
private String callApiWithResult(String commandName, String commandOption)
throws AceQLException {
try {
if (commandName == null) {
throw new NullPointerException("commandName is null!");
}
String result = callWithGet(commandName, commandOption);
ResultAnalyzer resultAnalyzer = new ResultAnalyzer(result,
httpStatusCode, httpStatusMessage);
if (!resultAnalyzer.isStatusOk()) {
throw new AceQLException(resultAnalyzer.getErrorMessage(),
resultAnalyzer.getErrorType(), null,
resultAnalyzer.getStackTrace(), httpStatusCode);
}
return resultAnalyzer.getResult();
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
private String callWithGet(String action, String actionParameter)
throws IOException {
String urlWithaction = url + action;
if (actionParameter != null && !actionParameter.isEmpty()) {
urlWithaction += "/" + actionParameter;
}
return callWithGet(urlWithaction);
}
private InputStream callWithGetReturnStream(String url)
throws MalformedURLException, IOException,
UnsupportedEncodingException {
/*
if (httpVersion == 1) {
return callWithGetInputStreamHttp11(url);
} else {
return callWithGetInputStreamHttp2(url);
}
*/
return callWithGetInputStreamHttp11(url);
}
// FUTUR USAGE
// private int httpVersion = 1;
// OkHttpClient client = new OkHttpClient();
//
// private InputStream callWithGetInputStreamHttp2(String url)
// throws MalformedURLException, IOException, ProtocolException {
//
// Request request = new Request.Builder().url(url).build();
//
// Response response = client.newCall(request).execute();
// return response.body().byteStream();
//
// }
private InputStream callWithGetInputStreamHttp11(String url)
throws MalformedURLException, IOException, ProtocolException {
URL theUrl = new URL(url);
HttpURLConnection conn = null;
if (this.proxy == null) {
conn = (HttpURLConnection) theUrl.openConnection();
} else {
conn = (HttpURLConnection) theUrl.openConnection(proxy);
}
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setReadTimeout(readTimeout);
conn.setRequestMethod("GET");
conn.setDoOutput(true);
trace();
trace("Executing request " + url);
httpStatusCode = conn.getResponseCode();
httpStatusMessage = conn.getResponseMessage();
InputStream in = null;
//if (httpStatusCode == HttpURLConnection.HTTP_OK || httpStatusCode == HttpURLConnection.HTTP_MOVED_TEMP) {
if (httpStatusCode == HttpURLConnection.HTTP_OK) {
in = conn.getInputStream();
} else {
in = conn.getErrorStream();
}
return in;
}
private String callWithGet(String url) throws MalformedURLException,
IOException, ProtocolException, UnsupportedEncodingException {
String responseBody;
InputStream in = null;
try {
in = callWithGetReturnStream(url);
if (in == null)
return null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
IOUtils.copy(in, out);
responseBody = out.toString("UTF-8");
if (responseBody != null) {
responseBody = responseBody.trim();
}
trace("----------------------------------------");
trace(responseBody);
trace("----------------------------------------");
return responseBody;
}
finally {
IOUtils.closeQuietly(in);
}
}
private InputStream callWithPost(String action,
Map parameters) throws MalformedURLException,
IOException, ProtocolException, UnsupportedEncodingException {
String urlWithaction = url + action;
URL theUrl = new URL(urlWithaction);
HttpURLConnection conn = null;
if (this.proxy == null) {
conn = (HttpURLConnection) theUrl.openConnection();
} else {
conn = (HttpURLConnection) theUrl.openConnection(proxy);
}
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setReadTimeout(readTimeout);
conn.setRequestMethod("POST");
conn.setDoOutput(true);
TimeoutConnector timeoutConnector = new TimeoutConnector(conn,
connectTimeout);
// try (OutputStream connOut = timeoutConnector.getOutputStream();) {
// BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
// connOut, "UTF-8"));
// writer.write(AceQLHttpApi.getPostDataString(parameters));
//
// // writer.flush();
// writer.close();
OutputStream connOut = null;
try {
connOut = timeoutConnector.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
connOut, "UTF-8"));
writer.write(AceQLHttpApi.getPostDataString(parameters));
// writer.flush();
writer.close();
}
finally {
IOUtils.closeQuietly(connOut);
}
trace();
trace("Executing request: " + urlWithaction);
if (parameters.containsKey("sql")) {
trace("sql..............: " + parameters.get("sql"));
}
trace("parameters.......: " + parameters);
// Analyze the error after request execution
httpStatusCode = conn.getResponseCode();
httpStatusMessage = conn.getResponseMessage();
InputStream in = null;
if (httpStatusCode == HttpURLConnection.HTTP_OK) {
in = conn.getInputStream();
} else {
in = conn.getErrorStream();
}
return in;
}
private void setProxyCredentials() {
if (proxy == null) {
return;
}
// Sets the credential for authentication
if (passwordAuthentication != null) {
final String proxyAuthUsername = passwordAuthentication
.getUserName();
final char[] proxyPassword = passwordAuthentication.getPassword();
Authenticator authenticator = new Authenticator() {
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(proxyAuthUsername,
proxyPassword);
}
};
if (DEBUG) {
System.out.println("passwordAuthentication: "
+ proxyAuthUsername + " " + new String(proxyPassword));
}
Authenticator.setDefault(authenticator);
}
}
// ////////////////////////////////////////////////////
// PUBLIC METHODS //
// ///////////////////////////////////////////////////
@Override
public AceQLHttpApi clone() {
AceQLHttpApi aceQLHttpApi;
try {
aceQLHttpApi = new AceQLHttpApi(serverUrl, database, username,
password, proxy, passwordAuthentication);
aceQLHttpApi.setPrettyPrinting(prettyPrinting);
aceQLHttpApi.setGzipResult(gzipResult);
} catch (SQLException e) {
throw new IllegalStateException(e);
}
return aceQLHttpApi;
}
/**
* Says if trace is on
*
* @return true if trace is on
*/
public static boolean isTraceOn() {
return TRACE_ON;
}
/**
* Sets the trace on/off
*
* @param TRACE_ON
* if true, trace will be on
*/
public static void setTraceOn(boolean traceOn) {
TRACE_ON = traceOn;
}
/**
* Returns the cancelled value set by the progress indicator
*
* @return the cancelled value set by the progress indicator
*/
public AtomicBoolean getCancelled() {
return cancelled;
}
/**
* Sets the shareable canceled variable that will be used by the progress
* indicator to notify this instance that the user has cancelled the current
* blob/clob upload or download.
*
* @param cancelled the
* shareable canceled variable that will be used by the progress
* indicator to notify this instance that the end user has
* cancelled the current blob/clob upload or download
*
*/
public void setCancelled(AtomicBoolean cancelled) {
this.cancelled = cancelled;
}
/**
* Returns the sharable progress variable that will store blob/clob upload
* or download progress between 0 and 100
*
* @return the sharable progress variable that will store blob/clob upload
* or download progress between 0 and 100
*
*/
public AtomicInteger getProgress() {
return progress;
}
/**
* Sets the sharable progress variable that will store blob/clob upload or
* download progress between 0 and 100. Will be used by progress indicators
* to show the progress.
*
* @param progress
* the sharable progress variable
*/
public void setProgress(AtomicInteger progress) {
this.progress = progress;
}
/**
* @return the prettyPrinting
*/
public boolean isPrettyPrinting() {
return prettyPrinting;
}
/**
* Says the query result is returned compressed with the GZIP file format.
* @return the gzipResult
*/
public boolean isGzipResult() {
return gzipResult;
}
/**
* Says if JSON contents are to be pretty printed. Defaults to false.
*
* @param prettyPrinting
* if true, JSON contents are to be pretty printed
*/
public void setPrettyPrinting(boolean prettyPrinting) {
this.prettyPrinting = prettyPrinting;
}
/**
* Define if result sets are compressed before download. Defaults to true.
*
* @param gzipResult
* if true, sets are compressed before download
*/
public void setGzipResult(boolean gzipResult) {
this.gzipResult = gzipResult;
}
/**
* Calls /get_version API
*
* @throws AceQLException
* if any Exception occurs
*/
public String getServerVersion() throws AceQLException {
String result = callApiWithResult("get_version", null);
return result;
}
/**
* Gets the SDK version
*
* @throws AceQLException
* if any Exception occurs
*/
public String getClientVersion() {
return org.kawanfw.sql.version.Version.getVersion();
}
/**
* Calls /disconnect API
*
* @throws AceQLException
* if any Exception occurs
*/
public void disconnect() throws AceQLException {
callApiNoResult("disconnect", null);
}
/**
* Calls /commit API
*
* @throws AceQLException
* if any Exception occurs
*/
public void commit() throws AceQLException {
callApiNoResult("commit", null);
}
/**
* Calls /rollback API
*
* @throws AceQLException
* if any Exception occurs
*/
public void rollback() throws AceQLException {
callApiNoResult("rollback", null);
}
/**
* Calls /set_transaction_isolation_level API
*
* @param level
* the isolation level
* @throws AceQLException
* if any Exception occurs
*/
public void setTransactionIsolation(String level) throws AceQLException {
callApiNoResult("set_transaction_isolation_level", level);
}
/**
* Calls /set_holdability API
*
* @param holdability
* the holdability
* @throws AceQLException
* if any Exception occurs
*/
public void setHoldability(String holdability) throws AceQLException {
callApiNoResult("set_holdability", holdability);
}
/**
* Calls /set_auto_commit API
*
* @param autoCommit
* true to enable auto-commit mode;
* false to disable it
* @throws AceQLException
* if any Exception occurs
*/
public void setAutoCommit(boolean autoCommit) throws AceQLException {
callApiNoResult("set_auto_commit", autoCommit + "");
}
/**
* Calls /get_auto_commit API
*
* @param autoCommit
* true to enable auto-commit mode;
* false to disable it
* @return the current state of this Connection object's
* auto-commit mode
* @throws AceQLException
* if any Exception occurs
*/
public boolean getAutoCommit() throws AceQLException {
String result = callApiWithResult("get_auto_commit", null);
return Boolean.parseBoolean(result);
}
/**
* Calls /get_auto_commit API
*
* @return true if this Connection object is
* read-only; false otherwise
* @throws AceQLException
* if any Exception occurs
*/
public boolean isReadOnly() throws AceQLException {
String result = callApiWithResult("is_read_only", null);
return Boolean.parseBoolean(result);
}
/**
* Calls /set_read_only API
*
* @param readOnly
* {@code true} enables read-only mode; {@code false} disables it
* @throws AceQLException
* if any Exception occurs
*/
public void setReadOnly(boolean readOnly) throws AceQLException {
callApiNoResult("set_read_only", readOnly + "");
}
/**
* Calls /get_holdability API
*
* @return the holdability, one of hold_cursors_over_commit or
* close_cursors_at_commit
* @throws AceQLException
* if any Exception occurs
*/
public String getHoldability() throws AceQLException {
String result = callApiWithResult("get_holdability", null);
return result;
}
/**
* Calls /get_transaction_isolation_level API
*
* @return the current transaction isolation level, which will be one of the
* following constants: transaction_read_uncommitted,
* transaction_read_committed,
* transaction_repeatable_read,
* transaction_serializable, or
* transaction_none.
* @throws AceQLException
* if any Exception occurs
*/
public String getTransactionIsolation() throws AceQLException {
String result = callApiWithResult("get_transaction_isolation_level", null);
return result;
}
/**
* Calls /execute_update API
*
* @param sql
* an SQL INSERT, UPDATE or
* DELETE statement or an SQL statement that returns
* nothing
* @param isPreparedStatement
* if true, the server will generate a prepared statement, else a
* simple statement
* @param statementParameters
* the statement parameters in JSON format. Maybe null for simple
* statement call.
* @return either the row count for INSERT, UPDATE
* or DELETE statements, or 0 for SQL
* statements that return nothing
* @throws AceQLException
* if any Exception occurs
*/
public int executeUpdate(String sql, boolean isPreparedStatement,
Map statementParameters) throws AceQLException {
try {
if (sql == null) {
throw new NullPointerException("sql is null!");
}
String action = "execute_update";
Map parametersMap = new HashMap();
parametersMap.put("sql", sql);
parametersMap.put("prepared_statement", new Boolean(
isPreparedStatement).toString());
trace("sql: " + sql);
trace("statement_parameters: " + statementParameters);
// Add the statement parameters map
if (statementParameters != null) {
parametersMap.putAll(statementParameters);
}
// try (InputStream in = callWithPost(action, parametersMap);) {
//
// String result = null;
//
// if (in != null) {
// ByteArrayOutputStream out = new ByteArrayOutputStream();
// IOUtils.copy(in, out);
//
// result = out.toString("UTF-8");
// trace("result: " + result);
// }
InputStream in = null;
String result = null;
try {
in = callWithPost(action, parametersMap);
if (in != null) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
IOUtils.copy(in, out);
result = out.toString("UTF-8");
trace("result: " + result);
}
}
finally {
IOUtils.closeQuietly(in);
}
ResultAnalyzer resultAnalyzer = new ResultAnalyzer(result,
httpStatusCode, httpStatusMessage);
if (!resultAnalyzer.isStatusOk()) {
throw new AceQLException(resultAnalyzer.getErrorMessage(),
resultAnalyzer.getErrorType(), null,
resultAnalyzer.getStackTrace(), httpStatusCode);
}
int rowCount = resultAnalyzer.getIntvalue("row_count");
return rowCount;
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
/**
* Calls /execute_query API
*
* @param sql
* an SQL INSERT, UPDATE or
* DELETE statement or an SQL statement that returns
* nothing
* @param isPreparedStatement
* if true, the server will generate a prepared statement, else a
* simple statement
* @param statementParameters
* the statement parameters in JSON format. Maybe null for simple
* statement call.
* @return the input stream containing either an error, or the result set in
* JSON format. See user documentation.
* @throws AceQLException
* if any Exception occurs
*/
public InputStream executeQuery(String sql, boolean isPreparedStatement,
Map statementParameters) throws AceQLException {
try {
if (sql == null) {
throw new NullPointerException("sql is null!");
}
String action = "execute_query";
Map parametersMap = new HashMap();
parametersMap.put("sql", sql);
parametersMap.put("prepared_statement", new Boolean(
isPreparedStatement).toString());
parametersMap
.put("gzip_result", new Boolean(gzipResult).toString());
parametersMap.put("pretty_printing",
new Boolean(prettyPrinting).toString());
// Add the statement parameters map
if (statementParameters != null) {
parametersMap.putAll(statementParameters);
}
trace("sql: " + sql);
trace("statement_parameters: " + statementParameters);
InputStream in = callWithPost(action, parametersMap);
return in;
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
/**
* Calls /blob_upload API
*
* @param blobId
* the Blob/Clob Id
* @param inputStream
* the local Blob/Clob local file input stream
* @throws AceQLException
* if any Exception occurs
*/
public void blobUpload(String blobId, InputStream inputStream,
long totalLength) throws AceQLException {
try {
if (blobId == null) {
throw new NullPointerException("blobId is null!");
}
if (inputStream == null) {
throw new NullPointerException("inputStream is null!");
}
// if (file == null) {
// throw new NullPointerException("file is null!");
// }
//
// if (!file.exists()) {
// throw new FileNotFoundException("file does not exist: " + file);
// }
URL theURL = new URL(url + "blob_upload");
trace("request : " + theURL);
HttpURLConnection conn = null;
if (proxy == null) {
conn = (HttpURLConnection) theURL.openConnection();
} else {
conn = (HttpURLConnection) theURL.openConnection(proxy);
}
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setRequestMethod("POST");
conn.setReadTimeout(readTimeout);
conn.setDoOutput(true);
final MultipartUtility http = new MultipartUtility(theURL, conn,
connectTimeout, progress, cancelled, totalLength);
Map parameters = new HashMap();
parameters.put("blob_id", blobId);
for (Map.Entry entry : parameters.entrySet()) {
// trace(entry.getKey() + "/" + entry.getValue());
http.addFormField(entry.getKey(), entry.getValue());
}
// Server needs a unique file name to store the blob
String fileName = UUID.randomUUID().toString() + ".blob";
http.addFilePart("file", inputStream, fileName);
http.finish();
conn = http.getConnection();
// Analyze the error after request execution
httpStatusCode = conn.getResponseCode();
httpStatusMessage = conn.getResponseMessage();
trace("blob_id : " + blobId);
trace("httpStatusCode : " + httpStatusCode);
trace("httpStatusMessage: " + httpStatusMessage);
InputStream inConn = null;
String result;
try {
if (httpStatusCode == HttpURLConnection.HTTP_OK) {
inConn = conn.getInputStream();
} else {
inConn = conn.getErrorStream();
}
result = null;
if (inConn != null) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
IOUtils.copy(inConn, out);
result = out.toString("UTF-8");
}
} finally {
IOUtils.closeQuietly(inConn);
}
ResultAnalyzer resultAnalyzer = new ResultAnalyzer(result,
httpStatusCode, httpStatusMessage);
if (!resultAnalyzer.isStatusOk()) {
throw new AceQLException(resultAnalyzer.getErrorMessage(),
resultAnalyzer.getErrorType(), null,
resultAnalyzer.getStackTrace(), httpStatusCode);
}
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
/**
* Calls /get_blob_length API
*
* @param blobId
* the Blob/Clob Id
* @return the server Blob/Clob length
* @throws AceQLException
* if any Exception occurs
*/
public long getBlobLength(String blobId) throws AceQLException {
try {
if (blobId == null) {
throw new NullPointerException("blobId is null!");
}
String action = "get_blob_length";
Map parameters = new HashMap();
parameters.put("blob_id", blobId);
ByteArrayOutputStream out = new ByteArrayOutputStream();
String result = null;
// try (InputStream in = callWithPost(action, parameters);) {
//
// if (in != null) {
// IOUtils.copy(in, out);
// result = out.toString("UTF-8");
// }
// }
InputStream in = null;
try {
in = callWithPost(action, parameters);
if (in != null) {
IOUtils.copy(in, out);
result = out.toString("UTF-8");
}
}
finally {
IOUtils.closeQuietly(in);
}
ResultAnalyzer resultAnalyzer = new ResultAnalyzer(result,
httpStatusCode, httpStatusMessage);
if (!resultAnalyzer.isStatusOk()) {
throw new AceQLException(resultAnalyzer.getErrorMessage(),
resultAnalyzer.getErrorType(), null,
resultAnalyzer.getStackTrace(), httpStatusCode);
}
String lengthStr = resultAnalyzer.getValue("length");
long length = Long.parseLong(lengthStr);
return length;
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
/**
* Calls /blob_download API
*
* @param blobId
* the Blob/Clob Id
* @return the input stream containing either an error, or the result set in
* JSON format. See user documentation.
* @throws AceQLException
* if any Exception occurs
*/
public InputStream blobDownload(String blobId) throws AceQLException {
try {
if (blobId == null) {
throw new NullPointerException("blobId is null!");
}
String action = "blob_download";
Map parameters = new HashMap();
parameters.put("blob_id", blobId);
InputStream in = null;
in = callWithPost(action, parameters);
// if (httpStatusCode != HttpURLConnection.HTTP_OK) {
// throw new AceQLException("HTTP_FAILURE" + " " + httpStatusCode
// + " " + httpStatusMessage, 0, httpStatusCode,
// httpStatusMessage);
// }
return in;
} catch (Exception e) {
if (e instanceof AceQLException) {
throw (AceQLException) e;
} else {
throw new AceQLException(e.getMessage(), 0, e, null,
httpStatusCode);
}
}
}
/**
* Formats & URL encode the the post data for POST.
*
* @param params
* the parameter names and values
* @return the formated and URL encoded string for the POST.
* @throws UnsupportedEncodingException
*/
public static String getPostDataString(Map requestParams)
throws UnsupportedEncodingException {
StringBuilder result = new StringBuilder();
boolean first = true;
for (Map.Entry entry : requestParams.entrySet()) {
// trace(entry.getKey() + "/" + entry.getValue());
if (first)
first = false;
else
result.append("&");
if (entry.getValue() != null) {
result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
}
}
return result.toString();
}
public int getHttpStatusCode() {
return httpStatusCode;
}
/**
* @return the httpStatusMessage
*/
public String getHttpStatusMessage() {
return httpStatusMessage;
}
}