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org.apache.pig.parser.QueryParserUtils Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.pig.parser;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.antlr.runtime.tree.CommonTree;
import org.antlr.runtime.tree.Tree;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.RecognitionException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.pig.FuncSpec;
import org.apache.pig.StoreFuncInterface;
import org.apache.pig.backend.datastorage.ContainerDescriptor;
import org.apache.pig.backend.datastorage.DataStorage;
import org.apache.pig.backend.datastorage.ElementDescriptor;
import org.apache.pig.builtin.PigStorage;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.io.FileSpec;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.newplan.Operator;
import org.apache.pig.newplan.logical.relational.LOStore;
import org.apache.pig.newplan.logical.relational.LogicalPlan;
import org.apache.pig.tools.pigstats.ScriptState;
public class QueryParserUtils {
private static Log log = LogFactory.getLog( LogicalPlanGenerator.class );
public static String removeQuotes(String str) {
if (str.startsWith("\u005c'") && str.endsWith("\u005c'"))
return str.substring(1, str.length() - 1);
else
return str;
}
public static void attachStorePlan(LogicalPlan lp, String fileName, String func,
Operator input, String alias, PigContext pigContext) throws FrontendException {
if( func == null ) {
func = PigStorage.class.getName();
}
FuncSpec funcSpec = new FuncSpec( func );
StoreFuncInterface stoFunc = (StoreFuncInterface)PigContext.instantiateFuncFromSpec( funcSpec );
stoFunc.setStoreFuncUDFContextSignature( LOStore.constructSignature( alias, fileName, funcSpec ) );
fileName = removeQuotes( fileName );
FileSpec fileSpec = new FileSpec( fileName, funcSpec );
LOStore store = new LOStore( lp, fileSpec );
store.setAlias( alias );
try {
stoFunc.relToAbsPathForStoreLocation( fileName, getCurrentDir( pigContext ) );
} catch (IOException ioe) {
FrontendException e = new FrontendException( ioe.getMessage(), ioe );
throw e;
}
lp.add( store );
lp.connect( input, store );
}
static Path getCurrentDir(PigContext pigContext) throws IOException {
DataStorage dfs = pigContext.getDfs();
ContainerDescriptor desc = dfs.getActiveContainer();
ElementDescriptor el = dfs.asElement(desc);
return new Path(el.toString());
}
static void setHdfsServers(String absolutePath, PigContext pigContext) throws URISyntaxException {
// Get native host
String defaultFS = (String)pigContext.getProperties().get("fs.default.name");
if (defaultFS==null)
defaultFS = (String)pigContext.getProperties().get("fs.defaultFS");
URI defaultFSURI = new URI(defaultFS);
String defaultHost = defaultFSURI.getHost();
if (defaultHost == null) defaultHost = "";
defaultHost = defaultHost.toLowerCase();
Set remoteHosts = getRemoteHosts(absolutePath, defaultHost);
String hdfsServersString = (String)pigContext.getProperties().get("mapreduce.job.hdfs-servers");
if (hdfsServersString == null) hdfsServersString = "";
String hdfsServers[] = hdfsServersString.split(",");
for (String remoteHost : remoteHosts) {
boolean existing = false;
for (String hdfsServer : hdfsServers) {
if (hdfsServer.equals(remoteHost)) {
existing = true;
}
}
if (!existing) {
if (!hdfsServersString.isEmpty()) {
hdfsServersString = hdfsServersString + ",";
}
hdfsServersString = hdfsServersString + remoteHost;
}
}
if (!hdfsServersString.isEmpty()) {
pigContext.getProperties().setProperty("mapreduce.job.hdfs-servers", hdfsServersString);
}
}
static Set getRemoteHosts(String absolutePath, String defaultHost) {
String HAR_PREFIX = "hdfs-";
Set result = new HashSet();
String[] fnames = absolutePath.split(",");
for (String fname: fnames) {
// remove leading/trailing whitespace(s)
fname = fname.trim();
Path p = new Path(fname);
URI uri = p.toUri();
if(uri.isAbsolute()) {
String scheme = uri.getScheme();
if (scheme!=null && scheme.toLowerCase().equals("hdfs")||scheme.toLowerCase().equals("har")) {
if (uri.getHost()==null)
continue;
String thisHost = uri.getHost().toLowerCase();
if (scheme.toLowerCase().equals("har")) {
if (thisHost.startsWith(HAR_PREFIX)) {
thisHost = thisHost.substring(HAR_PREFIX.length());
}
}
if (!uri.getHost().isEmpty() &&
!thisHost.equals(defaultHost)) {
if (uri.getPort()!=-1)
result.add("hdfs://"+thisHost+":"+uri.getPort());
else
result.add("hdfs://"+thisHost);
}
}
}
}
return result;
}
static String constructFileNameSignature(String fileName, FuncSpec funcSpec) {
return fileName + "_" + funcSpec.toString();
}
static String constructSignature(String alias, String filename, FuncSpec funcSpec) {
return alias + "_" + filename + "_" + funcSpec.toString();
}
static String generateErrorHeader(RecognitionException ex, String filename) {
return new SourceLocation( filename, ex.line, ex.charPositionInLine ).toString();
}
@SuppressWarnings({ "unchecked", "rawtypes" })
static void replaceNodeWithNodeList(Tree oldNode, CommonTree newTree,
String fileName) {
int idx = oldNode.getChildIndex();
CommonTree parent = (CommonTree) oldNode.getParent();
int count = parent.getChildCount();
List childList = new ArrayList(parent.getChildren());
List macroList = newTree.getChildren();
while (parent.getChildCount() > 0) {
parent.deleteChild(0);
}
for (int i = 0; i < count; i++) {
if (i == idx) {
// add only there is something to add
if (macroList != null) {
parent.addChildren(macroList);
}
} else {
parent.addChild((Tree) childList.get(i));
}
}
}
static BufferedReader getImportScriptAsReader(String scriptPath)
throws FileNotFoundException {
File f = new File(scriptPath);
if (f.exists() || f.isAbsolute() || scriptPath.startsWith("./")
|| scriptPath.startsWith("../")) {
return new BufferedReader(new FileReader(f));
}
ScriptState state = ScriptState.get();
if (state != null && state.getPigContext() != null) {
String srchPath = state.getPigContext().getProperties()
.getProperty("pig.import.search.path");
if (srchPath != null) {
String[] paths = srchPath.split(",");
for (String path : paths) {
File f1 = new File(path + File.separator + scriptPath);
if (f1.exists()) {
return new BufferedReader(new FileReader(f1));
}
}
}
}
throw new FileNotFoundException("Can't find the Specified file "
+ scriptPath);
}
static QueryParser createParser(CommonTokenStream tokens) {
return createParser(tokens, 0);
}
static QueryParser createParser(CommonTokenStream tokens, int lineOffset) {
QueryParser parser = new QueryParser(tokens);
PigParserNodeAdaptor adaptor = new PigParserNodeAdaptor(
tokens.getSourceName(), lineOffset);
parser.setTreeAdaptor(adaptor);
return parser;
}
}
