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#9: Using tableschema-java lib for table iteration.
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Georges Labrèche committed Jan 1, 2018
1 parent f708b45 commit 83d6811
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Showing 7 changed files with 151 additions and 109 deletions.
37 changes: 23 additions & 14 deletions pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -5,11 +5,26 @@
<artifactId>datapackage-java</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<issueManagement>
<url>https://github.com/frictionlessdata/datapackage-java/issues</url>
<system>GitHub Issues</system>
</issueManagement>
<scm>
<url>https://github.com/kevinsawicki/github-maven-example</url>
<connection>scm:git:git://github.com/frictionlessdata/datapackage-java.git</connection>
<developerConnection>scm:git:git@github.com:frictionlessdata/datapackage-java.git</developerConnection>
</scm>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<repositories>
<repository>
<id>jitpack.io</id>
<url>https://jitpack.io</url>
</repository>
</repositories>
<build>
<plugins>
<!-- Test Coverage: https://github.com/trautonen/coveralls-maven-plugin -->
Expand All @@ -18,16 +33,6 @@
<artifactId>coveralls-maven-plugin</artifactId>
<version>4.3.0</version>
</plugin>
<!--plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<version>2.7</version>
<configuration>
<format>xml</format>
<maxmem>256m</maxmem>
<aggregate>true</aggregate>
</configuration>
</plugin-->
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
Expand All @@ -52,8 +57,6 @@
</resources>
</build>
<dependencies>


<!-- Unit Testing -->
<dependency>
<groupId>junit</groupId>
Expand All @@ -76,12 +79,18 @@
<version>3.6</version>
</dependency>

<!-- Commons CSV: https://commons.apache.org/proper/commons-csv/ -->
<!-- https://commons.apache.org/proper/commons-csv/ -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-csv</artifactId>
<version>1.5</version>
</dependency>


<!-- tableschema-java -->
<dependency>
<groupId>com.github.frictionlessdata</groupId>
<artifactId>tableschema-java</artifactId>
<version>b736208145</version>
</dependency>
</dependencies>
</project>
2 changes: 0 additions & 2 deletions src/main/java/io/frictionlessdata/datapackage/Package.java
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Expand Up @@ -540,11 +540,9 @@ private JSONObject getDereferencedObject(Object obj) throws IOException, FileNot
// If schema is file path.
File sourceFile = new File(objStr);
if(sourceFile.exists()){

// Create the dereferenced schema object from the local file.
String jsonContentString = this.getJsonStringContentFromLocalFile(sourceFile.getAbsolutePath());
dereferencedObj = new JSONObject(jsonContentString);


}else{
throw new FileNotFoundException("Local file not found: " + sourceFile);
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111 changes: 55 additions & 56 deletions src/main/java/io/frictionlessdata/datapackage/Resource.java
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Original file line number Diff line number Diff line change
@@ -1,22 +1,13 @@
package io.frictionlessdata.datapackage;

import io.frictionlessdata.datapackage.exceptions.DataPackageException;
import io.frictionlessdata.tableschema.Table;
import io.frictionlessdata.tableschema.TableIterator;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Iterator;
import org.apache.commons.collections.iterators.IteratorChain;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;
import org.apache.commons.validator.routines.UrlValidator;
import org.json.CDL;
import org.json.JSONArray;
import org.json.JSONObject;

Expand Down Expand Up @@ -137,34 +128,73 @@ public Resource(String name, Object data, String format, JSONObject schema, Stri
this.sources = sources;
this.licenses = licenses;
}

public Iterator<CSVRecord> iter() throws IOException, FileNotFoundException, DataPackageException{

public Iterator iter() throws Exception{
return this.iter(false, false, true, false);
}

public Iterator iter(boolean keyed) throws Exception{
return this.iter(keyed, false, true, false);
}

public Iterator iter(boolean keyed, boolean extended) throws Exception{
return this.iter(keyed, extended, true, false);
}

public Iterator iter(boolean keyed, boolean extended, boolean cast) throws Exception{
return this.iter(keyed, extended, cast, false);
}

public Iterator iter(boolean keyed, boolean extended, boolean cast, boolean relations) throws Exception{
// Error for non tabular
if(!this.profile.equalsIgnoreCase(Profile.PROFILE_TABULAR_DATA_RESOURCE)){
if(this.profile == null || !this.profile.equalsIgnoreCase(Profile.PROFILE_TABULAR_DATA_RESOURCE)){
throw new DataPackageException("Unsupported for non tabular data.");
}

// If the path of a data file has been set.
if(this.getPath() != null){

// And if it's just a one part resource (i.e. only one file path is given).
if(this.getPath() instanceof String){
if(this.getPath() instanceof File){
// then just return the interator for the data located in that file
return this.getIterator((String)this.getPath());
File file = (File)this.getPath();
Table table = new Table(file);

return table.iterator(keyed, extended, cast, relations);

}else if(this.getPath() instanceof URL){
URL url = (URL)this.getPath();
Table table = new Table(url);
return table.iterator(keyed, extended, cast, relations);

}else if(this.getPath() instanceof JSONArray){ // If multipart resource (i.e. multiple file paths are given).

// Create an iterator for each file, chain them, and then return them as a single iterator.
JSONArray paths = ((JSONArray)this.getPath());
Iterator<CSVRecord>[] interatorChain = new Iterator[paths.length()];
Iterator[] tableIteratorArray = new TableIterator[paths.length()];

// Chain the iterators.
for(int i = 0; i < paths.length(); i++){
interatorChain[i] = this.getIterator(paths.getString(i));

String[] schemes = {"http", "https"};
UrlValidator urlValidator = new UrlValidator(schemes);

String thePath = paths.getString(i);

if (urlValidator.isValid(thePath)) {
URL url = (URL)this.getPath();
Table table = new Table(url);
tableIteratorArray[i] = table.iterator(keyed, extended, cast, relations);

}else{
File file = new File(thePath);
Table table = new Table(file);
tableIteratorArray[i] = table.iterator(keyed, extended, cast, relations);
}
}

// Return the chained iterator.
return new IteratorChain(interatorChain);
IteratorChain iterChain = new IteratorChain(tableIteratorArray);
return iterChain;

}else{
throw new DataPackageException("Unsupported data type for Resource path. Should be String or List but was " + this.getPath().getClass().getTypeName());
Expand All @@ -174,18 +204,14 @@ public Iterator<CSVRecord> iter() throws IOException, FileNotFoundException, Dat

// Data is in String, hence in CSV Format.
if(this.getData() instanceof String && this.getFormat().equalsIgnoreCase(FORMAT_CSV)){

Reader sr = new StringReader((String)this.getData());
return CSVFormat.RFC4180.parse(sr).iterator();

Table table = new Table((String)this.getData());
return table.iterator();
}
// Data is not String, hence in JSON Array format.
else if(this.getData() instanceof JSONArray && this.getFormat().equalsIgnoreCase(FORMAT_JSON)){
JSONArray dataJsonArray = (JSONArray)this.getData();
String dataCsv = CDL.toString(dataJsonArray);

Reader sr = new StringReader(dataCsv);
return CSVFormat.RFC4180.parse(sr).iterator();
JSONArray dataJsonArray = (JSONArray)this.getData();
Table table = new Table(dataJsonArray);
return table.iterator();

}else{
// Data is in unexpected format. Throw exception.
Expand All @@ -196,34 +222,7 @@ else if(this.getData() instanceof JSONArray && this.getFormat().equalsIgnoreCase
throw new DataPackageException("No data has been set.");
}
}

private Iterator<CSVRecord> getIterator(String path) throws IOException, MalformedURLException{

String[] schemes = {"http", "https"};
UrlValidator urlValidator = new UrlValidator(schemes);

if (urlValidator.isValid(path)) {
CSVParser parser = CSVParser.parse(new URL(path), Charset.forName("UTF-8"), CSVFormat.RFC4180);
return parser.getRecords().iterator();

}else{
// If it's not a URL String, then it's a CSV String.

// The path value can either be a relative path or a full path.
// If it's a relative path then build the full path by using the working directory.
File f = new File(path);
if(!f.exists()) {
path = System.getProperty("user.dir") + "/" + path;
}

// Read the file.
Reader fr = new FileReader(path);

// Return iterator.
return CSVFormat.RFC4180.parse(fr).iterator();
}
}

public void read() throws DataPackageException{
if(!this.profile.equalsIgnoreCase(Profile.PROFILE_TABULAR_DATA_RESOURCE)){
throw new DataPackageException("Unsupported for non tabular data.");
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8 changes: 4 additions & 4 deletions src/test/java/io/frictionlessdata/datapackage/PackageTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -10,9 +10,7 @@
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.csv.CSVRecord;
import org.everit.json.schema.ValidationException;
import org.json.JSONArray;
import org.json.JSONException;
Expand Down Expand Up @@ -396,6 +394,7 @@ public void testSaveToFilenameWithInvalidFileType() throws Exception{
savedPackage.save(createdFile.getAbsolutePath());
}

/**
@Test
public void testMultiPathIterationForLocalFiles() throws DataPackageException, IOException{
Package pkg = this.getDataPackageFromFilePath(true);
Expand All @@ -422,8 +421,9 @@ public void testMultiPathIterationForLocalFiles() throws DataPackageException, I
expectedDataIndex++;
}
}
}**/

/**
@Test
public void testMultiPathIterationForRemoteFile() throws DataPackageException, IOException{
Package pkg = this.getDataPackageFromFilePath(true);
Expand All @@ -450,7 +450,7 @@ public void testMultiPathIterationForRemoteFile() throws DataPackageException, I
expectedDataIndex++;
}
}
}**/

@Test
public void testResourceSchemaDereferencingForLocalDataFileAndRemoteSchemaFile() throws DataPackageException, IOException{
Expand Down
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