diff --git a/src/main/java/io/anserini/collection/ClueWeb12Collection.java b/src/main/java/io/anserini/collection/ClueWeb12Collection.java
index 65a51ef6c5..8d9b165bda 100644
--- a/src/main/java/io/anserini/collection/ClueWeb12Collection.java
+++ b/src/main/java/io/anserini/collection/ClueWeb12Collection.java
@@ -16,7 +16,6 @@
package io.anserini.collection;
-import org.apache.commons.io.input.ReaderInputStream;
import org.apache.logging.log4j.LogManager;
import java.io.BufferedReader;
diff --git a/src/main/java/io/anserini/collection/ClueWeb22Collection.java b/src/main/java/io/anserini/collection/ClueWeb22Collection.java
new file mode 100644
index 0000000000..4092d813e2
--- /dev/null
+++ b/src/main/java/io/anserini/collection/ClueWeb22Collection.java
@@ -0,0 +1,165 @@
+/*
+ * Anserini: A Lucene toolkit for reproducible information retrieval research
+ *
+ * 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 io.anserini.collection;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.MappingIterator;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.Set;
+import java.util.zip.GZIPInputStream;
+
+/**
+ * An instance of the ClueWeb22-B collection.
+ */
+public class ClueWeb22Collection extends DocumentCollection {
+ private static final Logger LOG = LogManager.getLogger(ClueWeb22Collection.class);
+
+ public ClueWeb22Collection(Path path) {
+ this.path = path;
+ this.allowedFileSuffix = Set.of(".json.gz");
+ }
+
+ public ClueWeb22Collection() {
+ }
+
+ @Override
+ public FileSegment createFileSegment(Path p) throws IOException {
+ return new Segment(p);
+ }
+
+ @Override
+ public FileSegment createFileSegment(BufferedReader bufferedReader) throws IOException {
+ return new Segment(bufferedReader);
+ }
+
+ /**
+ * A file segment in the ClueWeb22-B collection.
+ */
+ public static class Segment extends FileSegment {
+ private JsonNode node = null;
+ private MappingIterator iterator;
+
+ public Segment(Path path) throws IOException {
+ super(path);
+
+ if (path.toString().endsWith(".gz")) {
+ InputStream stream = new GZIPInputStream(Files.newInputStream(path, StandardOpenOption.READ), BUFFER_SIZE);
+ bufferedReader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8));
+ } else {
+ bufferedReader = new BufferedReader(new FileReader(path.toString()));
+ }
+
+ ObjectMapper mapper = new ObjectMapper();
+ iterator = mapper.readerFor(JsonNode.class).readValues(bufferedReader);
+ if (iterator.hasNext()) {
+ node = iterator.next();
+ }
+ }
+
+ public Segment(BufferedReader bufferedReader) throws IOException {
+ super(bufferedReader);
+ ObjectMapper mapper = new ObjectMapper();
+ iterator = mapper.readerFor(JsonNode.class).readValues(bufferedReader);
+ if (iterator.hasNext()) {
+ node = iterator.next();
+ }
+ }
+
+ @Override
+ public void readNext() throws NoSuchElementException {
+ if (node == null) {
+ throw new NoSuchElementException("JsonNode is empty");
+ } else if (node.isObject()) {
+ bufferedRecord = new Document(node);
+ if (iterator.hasNext()) {
+ node = iterator.next();
+ } else {
+ atEOF = true;
+ }
+ } else {
+ LOG.error("Error: invalid JsonNode type");
+ throw new NoSuchElementException("Invalid JsonNode type");
+ }
+ }
+ }
+
+ /**
+ * A document in the ClueWeb22-B collection.
+ */
+ public static class Document implements SourceDocument {
+ private String id;
+ private String contents;
+ private String raw;
+ private Map fields;
+
+ public Document(JsonNode json) {
+ this.raw = json.toString();
+ this.fields = new HashMap<>();
+
+ json.fields().forEachRemaining(e -> {
+ if ("ClueWeb22-ID".equals(e.getKey())) {
+ this.id = json.get("ClueWeb22-ID").asText();
+ } else if ("Clean-Text".equals(e.getKey())) {
+ this.contents = json.get("Clean-Text").asText();
+ } else {
+ this.fields.put(e.getKey(), e.getValue().asText());
+ }
+ });
+ }
+
+ @Override
+ public String id() {
+ if (id == null) {
+ throw new RuntimeException("Document does not have the required \"ClueWeb22-ID\" field!");
+ }
+ return id;
+ }
+
+ @Override
+ public String contents() {
+ if (contents == null) {
+ throw new RuntimeException("Document does not have the required \"Clean-Text\" field!");
+ }
+ return contents;
+ }
+
+ @Override
+ public String raw() {
+ return raw;
+ }
+
+ @Override
+ public boolean indexable() {
+ return true;
+ }
+ }
+}
diff --git a/src/test/java/io/anserini/collection/ClueWeb22CollectionTest.java b/src/test/java/io/anserini/collection/ClueWeb22CollectionTest.java
new file mode 100644
index 0000000000..d4dbeb23ff
--- /dev/null
+++ b/src/test/java/io/anserini/collection/ClueWeb22CollectionTest.java
@@ -0,0 +1,53 @@
+/*
+ * Anserini: A Lucene toolkit for reproducible information retrieval research
+ *
+ * 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 io.anserini.collection;
+
+import org.junit.Before;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Map;
+
+public class ClueWeb22CollectionTest extends DocumentCollectionTest {
+
+ @Before
+ public void setUp() throws Exception {
+ super.setUp();
+
+ collectionPath = Paths.get("src/test/resources/sample_docs/clueweb22/");
+ collection = new ClueWeb22Collection(collectionPath);
+
+ Path segment1 = Paths.get("src/test/resources/sample_docs/clueweb22/txt/en/en00/en0000/en0000-30.json.gz");
+
+ segmentPaths.add(segment1);
+ segmentDocCounts.put(segment1, 2);
+
+ totalSegments = 1;
+ totalDocs = 2;
+
+ expected.put("clueweb22-en0000-30-00000", Map.of("id", "clueweb22-en0000-30-00000"));
+ expected.put("clueweb22-en0000-30-00001", Map.of("id", "clueweb22-en0000-30-00001"));
+ }
+
+ @Override
+ void checkDocument(SourceDocument doc, Map expected) {
+ assertTrue(doc.indexable());
+ assertEquals(expected.get("id"), doc.id());
+ assertNotNull(doc.contents());
+ assertTrue(doc.contents().length() > 0);
+ }
+}
diff --git a/src/test/resources/sample_docs/clueweb22/txt/en/en00/en0000/en0000-30.json.gz b/src/test/resources/sample_docs/clueweb22/txt/en/en00/en0000/en0000-30.json.gz
new file mode 100644
index 0000000000..87824fa8e7
Binary files /dev/null and b/src/test/resources/sample_docs/clueweb22/txt/en/en00/en0000/en0000-30.json.gz differ