org.elasticsearch.hadoop.util.IOUtils Maven / Gradle / Ivy
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* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.hadoop.util;
import org.elasticsearch.hadoop.EsHadoopIllegalArgumentException;
import org.elasticsearch.hadoop.serialization.EsHadoopSerializationException;
import org.elasticsearch.hadoop.thirdparty.codehaus.jackson.map.ObjectMapper;
import org.elasticsearch.hadoop.thirdparty.codehaus.jackson.map.SerializationConfig;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.lang.reflect.Field;
import java.net.JarURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Properties;
/**
* Utility class used internally for the Pig support.
*/
public abstract class IOUtils {
private final static Field BYTE_ARRAY_BUFFER;
static {
BYTE_ARRAY_BUFFER = ReflectionUtils.findField(ByteArrayInputStream.class, "buf");
ReflectionUtils.makeAccessible(BYTE_ARRAY_BUFFER);
}
private static final ObjectMapper mapper = new ObjectMapper().configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false);
/**
* This method serializes object into a json String using jackson. The object must support jackson serialization.
*/
public static String serializeToJsonString(Object object) {
if (object == null) {
return StringUtils.EMPTY;
}
final String json;
try {
json = mapper.writeValueAsString(object);
} catch (IOException ex) {
throw new EsHadoopSerializationException("Cannot serialize object: " + object, ex);
}
return json;
}
/**
* This method deserializes a String that was created by serializeToJsonString
*/
public static T deserializeFromJsonString(String data, Class clazz) {
if (!StringUtils.hasLength(data)) {
return null;
}
final T object;
try {
object = mapper.readValue(data, clazz);
} catch (IOException e) {
throw new EsHadoopSerializationException("Cannot deserialize string: [" + data + "]", e);
}
return object;
}
public static String propsToString(Properties props) {
StringWriter sw = new StringWriter();
if (props != null) {
try {
props.store(sw, "");
} catch (IOException ex) {
throw new EsHadoopIllegalArgumentException(ex);
}
}
return sw.toString();
}
public static Properties propsFromString(String source) {
Properties copy = new Properties();
if (source != null) {
try {
copy.load(new StringReader(source));
} catch (IOException ex) {
throw new EsHadoopIllegalArgumentException(ex);
}
}
return copy;
}
public static BytesArray asBytes(InputStream in) throws IOException {
BytesArray ba = unwrapStreamBuffer(in);
if (ba != null) {
return ba;
}
return asBytes(new BytesArray(in.available()), in);
}
public static BytesArray asBytes(BytesArray ba, InputStream in) throws IOException {
BytesArray buf = unwrapStreamBuffer(in);
if (buf != null) {
ba.bytes(buf);
return ba;
}
FastByteArrayOutputStream bos = new FastByteArrayOutputStream(ba);
byte[] buffer = new byte[1024];
int read = 0;
try {
while ((read = in.read(buffer)) != -1) {
bos.write(buffer, 0, read);
}
} finally {
try {
in.close();
} catch (IOException ex) {
// ignore
}
// non needed but used to avoid the warnings
bos.close();
}
return bos.bytes();
}
public static String asString(InputStream in) throws IOException {
return asBytes(in).toString();
}
public static String asStringAlways(InputStream in) {
if (in == null) {
return StringUtils.EMPTY;
}
try {
return asBytes(in).toString();
} catch (IOException ex) {
return StringUtils.EMPTY;
}
}
public static InputStream open(String resource, ClassLoader loader) {
if (loader == null) {
loader = Thread.currentThread().getContextClassLoader();
}
if (loader == null) {
loader = IOUtils.class.getClassLoader();
}
try {
// no prefix means classpath
if (!resource.contains(":")) {
return loader.getResourceAsStream(resource);
}
return new URL(resource).openStream();
} catch (IOException ex) {
throw new EsHadoopIllegalArgumentException(String.format("Cannot open stream for resource %s", resource), ex);
}
}
public static InputStream open(String location) {
return open(location, null);
}
public static void close(Closeable closable) {
if (closable != null) {
try {
closable.close();
} catch (IOException e) {
// silently ignore
}
}
}
private static byte[] byteArrayInputStreamInternalBuffer(ByteArrayInputStream bais) {
return ReflectionUtils.getField(BYTE_ARRAY_BUFFER, bais);
}
private static BytesArray unwrapStreamBuffer(InputStream in) {
if (in instanceof FastByteArrayInputStream) {
return ((FastByteArrayInputStream) in).data;
}
if (in instanceof ByteArrayInputStream) {
return new BytesArray(byteArrayInputStreamInternalBuffer((ByteArrayInputStream) in));
}
return null;
}
/**
* Convert either a file or jar url into a local canonical file, or null if the file is a different scheme.
* @param fileURL the url to resolve to a canonical file.
* @return null if given URL is null, not using the jar scheme, or not using the file scheme. Otherwise, returns the
* String path to the local canonical file.
* @throws URISyntaxException If the given URL cannot be transformed into a URI
* @throws IOException If the jar cannot be read or if the canonical file cannot be determined
*/
public static String toCanonicalFilePath(URL fileURL) throws URISyntaxException, IOException {
if (fileURL == null) {
return null;
}
// Only handle jar: and file: schemes
if (!"jar".equals(fileURL.getProtocol()) && !"file".equals(fileURL.getProtocol())) {
return null;
}
// Parse the jar file location from the jar url. Doesn't open any resources.
if ("jar".equals(fileURL.getProtocol())) {
JarURLConnection jarURLConnection = (JarURLConnection) fileURL.openConnection();
fileURL = jarURLConnection.getJarFileURL();
}
URI fileURI = fileURL.toURI();
File file = new File(fileURI);
// Use filesystem to resolve any sym links or dots in the path to
// a singular unique file path
File canonicalFile = file.getCanonicalFile();
return canonicalFile.toURI().toString();
}
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