Introduced yaml parser as common lib

Introduced parser with capability of search for given json paths.
Introduced cucumber tests for gab service

Change-Id: I154d71085ee82c1ead7c4e002a488524f60c5d8d
Issue-ID: SDC-2094
Signed-off-by: Tomasz Golabek <tomasz.golabek@nokia.com>

8 files changed, 612 insertions, 0 deletions

diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/GABService.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/GABService.java
new file mode 100644
index 0000000000..0ac976a18a
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/GABService.java
@@ -0,0 +1,57 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab;
+
+import java.io.IOException;
+import org.onap.sdc.gab.model.GABQuery;
+import org.onap.sdc.gab.model.GABResults;
+
+/**
+ * <pre>
+ *     SDC/DCAE-DS FM/PM artifact browser service.
+ * </pre>
+ *
+ * Currently the artifact browser is able to parse VES_EVENT_REGISTRATION action (registering of all VES events -
+ * including alarms/faults) to serve required data from the given document.
+ *
+ * @version %I%, %G%
+ * @since 1.4.0-SNAPSHOT
+ */
+public interface GABService {
+
+    /**
+     * Extracting event data based on given YAML paths. As an output, a list of results is returned.
+     *
+     * @param gabQuery the parameter should contain three entries:
+     * <br>* JSON paths for querying specific data
+     * <br>* path/content of YAML document containing faults/measurements data
+     * <br>* type of the query - can be defined as a PATH or CONTENT depends of document-parameter type
+     *
+     * @exception IOException thrown in case of file/content problem.
+     * @return Result of search the query inside the given document.
+     *
+     * @see GABResults
+     * @see GABQuery
+     */
+    GABResults searchFor(GABQuery gabQuery) throws IOException;
+
+}
+
diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/GABServiceImpl.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/GABServiceImpl.java
new file mode 100644
index 0000000000..7f6c3539e2
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/GABServiceImpl.java
@@ -0,0 +1,42 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab;
+
+import java.io.IOException;
+import org.onap.sdc.gab.model.GABQuery;
+import org.onap.sdc.gab.model.GABQuery.GABQueryType;
+import org.onap.sdc.gab.model.GABResults;
+import org.onap.sdc.gab.yaml.GABYamlParser;
+import org.onap.sdc.gab.yaml.YamlParser;
+
+public class GABServiceImpl implements GABService {
+
+    public GABResults searchFor(GABQuery gabQuery) throws IOException {
+        try (GABYamlParser gabYamlParser = new GABYamlParser(new YamlParser())) {
+            return parse(gabQuery, gabYamlParser).filter(gabQuery.getFields()).collect();
+        }
+    }
+
+    private GABYamlParser parse(GABQuery gabQuery, GABYamlParser gabYamlParser){
+        return gabQuery.getType() == GABQueryType.PATH ?
+            gabYamlParser.parseFile(gabQuery.getDocument()) : gabYamlParser.parseContent(gabQuery.getDocument());
+    }
+}
diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABQuery.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABQuery.java
new file mode 100644
index 0000000000..f306e09665
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABQuery.java
@@ -0,0 +1,60 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab.model;
+
+import java.util.Set;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+/**
+ * See GABQuery.{@link #fields}, GABQuery.{@link #document}
+ */
+@AllArgsConstructor
+@Getter
+public class GABQuery {
+
+    /**
+     * PATH - when provided path to the yaml file
+     * CONTENT - when provided yaml file content
+     */
+    public enum GABQueryType{
+        PATH, CONTENT
+    }
+
+    /**
+     * JSON paths for querying specific data (this will be the definition of a "column").
+     */
+    private Set<String> fields;
+
+    /**
+     * An YAML document path/content
+     */
+    private String document;
+
+    /**
+     * Used for query type checking.
+     *
+     * @see GABQueryType
+     *
+     */
+    private GABQueryType type;
+
+}
diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResult.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResult.java
new file mode 100644
index 0000000000..3338024db8
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResult.java
@@ -0,0 +1,48 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab.model;
+
+import com.google.common.base.MoreObjects;
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+/**
+ * See GABResults.{@link #entries}
+ */
+@Getter
+@AllArgsConstructor
+public class GABResult {
+
+    /**
+     * Result entries list of the executed GABQuery.
+     *
+     * @see GABQuery
+     * @see GABResultEntry
+     */
+    private List<GABResultEntry> entries;
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this).add("entries", entries).toString();
+    }
+
+}
diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResultEntry.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResultEntry.java
new file mode 100644
index 0000000000..45b2412c1e
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResultEntry.java
@@ -0,0 +1,52 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab.model;
+
+import com.google.common.base.MoreObjects;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.onap.sdc.gab.GABService;
+
+/**
+ * See GABResultEntry.{@link #path}, GABResultEntry.{@link #data}
+ */
+@Getter
+@AllArgsConstructor
+public class GABResultEntry {
+    /**
+     * Path of queried data.
+     */
+    private String path;
+
+    /**
+     * Specific events-template data served by the GABService
+     * @see GABService
+     */
+    private Object data;
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+            .add("path", path)
+            .add("data", data)
+            .toString();
+    }
+}
diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResults.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResults.java
new file mode 100644
index 0000000000..23d026b2f4
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/model/GABResults.java
@@ -0,0 +1,47 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab.model;
+
+import com.google.common.base.MoreObjects;
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+/**
+ * See GABResults.{@link #rows}
+ */
+@Getter
+@AllArgsConstructor
+public class GABResults {
+
+    /**
+     * Results list of the executed GABQuery.
+     *
+     * @see GABQuery
+     * @see GABResult
+     */
+    private List<GABResult> rows;
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this).add("rows", rows).toString();
+    }
+}
diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/yaml/GABYamlParser.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/yaml/GABYamlParser.java
new file mode 100644
index 0000000000..fae94421ae
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/yaml/GABYamlParser.java
@@ -0,0 +1,118 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab.yaml;
+
+import java.io.IOException;
+import java.util.AbstractMap.SimpleEntry;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.onap.sdc.gab.model.GABResult;
+import org.onap.sdc.gab.model.GABResultEntry;
+import org.onap.sdc.gab.model.GABResults;
+
+/**
+ * Yaml parser and searcher for GAB. Requires 3 steps:
+ *
+ * <br>1. Load content of Yaml file using {@link #parseContent(String)} or {@link #parseFile(String)}
+ * <br>2. Provide keywords to search using {@link #filter(String)} or {@link #filter(Set)}
+ * <br>3. Collect the results using {@link #collect()}
+ */
+public class GABYamlParser implements AutoCloseable {
+
+    private YamlParser yamlParser;
+
+    public GABYamlParser(YamlParser yamlParser) {
+        this.yamlParser = yamlParser;
+    }
+
+    /**
+     * Provides yaml path for processing.
+     *
+     * @param path Yaml file path.
+     * @return Same parser with loaded source.
+     */
+    public GABYamlParser parseFile(String path) {
+        yamlParser.parseFile(path);
+        return this;
+    }
+
+    /**
+     * Provides yaml content for processing.
+     *
+     * @param content Yaml file content.
+     * @return Same parser with loaded source.
+     */
+    public GABYamlParser parseContent(String content) {
+        yamlParser.parseContent(content);
+        return this;
+    }
+
+    /**
+     * Adds set of filters for processing.
+     *
+     * @param filters correct json paths for searching resources.
+     * @return Same parser with loaded filters.
+     */
+    public GABYamlParser filter(Set<String> filters) {
+        yamlParser.filter(filters);
+        return this;
+    }
+
+    /**
+     * Adds single filter for processing.
+     *
+     * @param filter correct json path for searching resource.
+     * @return Same parser with loaded filter.
+     */
+    public GABYamlParser filter(String filter) {
+        yamlParser.filter(filter);
+        return this;
+    }
+
+    /**
+     * Collects the results from parsed yaml file and applied filters.
+     *
+     * @exception IOException Means that yaml file has invalid content.
+     * @return {@link GABResults}
+     */
+    public GABResults collect() throws IOException {
+        return new GABResults(yamlParser.collect().stream()
+            .map(results -> new GABResult(createGabResultEntryList(results)))
+            .collect(Collectors.toList()));
+    }
+
+    private List<GABResultEntry> createGabResultEntryList(List<SimpleEntry<String, ? extends Collection<Object>>> parsedContent) {
+        return Objects.isNull(parsedContent) ? Collections.emptyList() : parsedContent.stream()
+                .map(result -> result.getValue().stream()
+                    .map(entry -> new GABResultEntry(result.getKey(), entry))
+                    .collect(Collectors.toList())).flatMap(Collection::stream)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public void close() throws IOException {
+        yamlParser.close();
+    }
+}
diff --git a/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/yaml/YamlParser.java b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/yaml/YamlParser.java
new file mode 100644
index 0000000000..0d3575920c
--- /dev/null
+++ b/common/onap-generic-artifact-browser/onap-generic-artifact-browser-service/src/main/java/org/onap/sdc/gab/yaml/YamlParser.java
@@ -0,0 +1,188 @@
+/*
+ * ============LICENSE_START=======================================================
+ * GAB
+ * ================================================================================
+ * Copyright (C) 2019 Nokia Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.gab.yaml;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.AbstractMap.SimpleEntry;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
+import org.antlr.v4.runtime.misc.ParseCancellationException;
+import org.apache.commons.io.IOUtils;
+import org.jsfr.json.JsonSurfer;
+import org.jsfr.json.JsonSurferGson;
+import org.yaml.snakeyaml.Yaml;
+
+/**
+ * Yaml parser and searcher which requires 3 steps:
+ *
+ * <br>1. Load content of Yaml file using {@link #parseContent(String)} or {@link #parseFile(String)}
+ * <br>2. Provide keywords to search using {@link #filter(String)} or {@link #filter(Set)}
+ * <br>3. Collect the results using {@link #collect()}
+ */
+public class YamlParser implements AutoCloseable {
+
+    private static Logger LOGGER = Logger.getLogger(YamlParser.class.getName());
+
+    private Stream<Object> parsedYamlContent;
+    private InputStream inputStream;
+    private Set<String> filters;
+
+    public YamlParser() {
+        this.parsedYamlContent = Stream.empty();
+        filters = new HashSet<>();
+    }
+
+    /**
+     * Provides yaml path for processing.
+     *
+     * @param path Yaml file path.
+     * @return Same parser with loaded source.
+     */
+    YamlParser parseFile(String path) {
+        filters = new HashSet<>();
+        InputStream newInputStream = this.getClass().getClassLoader().getResourceAsStream(path);
+        parse(path, newInputStream);
+        return this;
+    }
+
+    /**
+     * Provides yaml content for processing.
+     *
+     * @param content Yaml file content.
+     * @return Same parser with loaded source.
+     */
+    YamlParser parseContent(String content) {
+        filters = new HashSet<>();
+        InputStream newInputStream = IOUtils.toInputStream(content);
+        parse(content, newInputStream);
+        return this;
+    }
+
+    /**
+     * Adds set of filters for processing.
+     *
+     * @param filters correct json paths for searching resources.
+     * @return Same parser with loaded filters.
+     */
+    YamlParser filter(Set<String> filters) {
+        this.filters.addAll(filters);
+        return this;
+    }
+
+    /**
+     * Adds single filter for processing.
+     *
+     * @param filter correct json path for searching resource.
+     * @return Same parser with loaded filter.
+     */
+    YamlParser filter(String filter) {
+        filters.add(filter);
+        return this;
+    }
+
+    /**
+     * Collects the results from parsed yaml file and applied filters.
+     *
+     * @exception IOException Means that yaml file has invalid content.
+     * @return List of List of simple entry 'key: collection of data'
+     */
+    List<List<SimpleEntry<String, ? extends Collection<Object>>>> collect() throws IOException {
+        try {
+            return parsedYamlContent.map(containsKeys).filter(notEmptyListPredicate()).collect(Collectors.toList());
+        } catch(Exception e){
+            LOGGER.log(Level.WARNING, "Unexpected document content. Please check body of the yaml file.", e);
+            throw new IOException("Unexpected document content");
+        }
+    }
+
+    private void parse(String yaml, InputStream newInputStream) {
+        try {
+            closeStream(inputStream);
+            inputStream = newInputStream;
+            if (Objects.isNull(inputStream) || inputStream.available() <= 0) {
+                throw new IOException("Empty input stream of yaml content.");
+            }
+            parsedYamlContent = StreamSupport.stream(new Yaml().loadAll(inputStream).spliterator(), false);
+        } catch (IOException e) {
+            LOGGER.log(Level.WARNING, "Cannot parse yaml: " + yaml, e);
+            parsedYamlContent = Stream.empty();
+        }
+    }
+
+    private Function<Object, List<SimpleEntry<String, ? extends Collection<Object>>>> containsKeys = parsedYamlSingleDocument -> {
+        JsonElement jsonElement = new Gson().toJsonTree(parsedYamlSingleDocument);
+        return findInJson(filters, jsonElement);
+    };
+
+    private List<SimpleEntry<String, ? extends Collection<Object>>> findInJson(Set<String> keys,
+        JsonElement document) {
+        return keys.stream()
+            .map(getEntryForKeyFunction(document))
+            .filter(notEmptyEntryPredicate())
+            .collect(Collectors.toList());
+    }
+
+    private Predicate<? super List<SimpleEntry<String, ? extends Collection<Object>>>> notEmptyListPredicate() {
+        return list -> !list.isEmpty();
+    }
+
+    private Predicate<SimpleEntry<String, ? extends Collection<Object>>> notEmptyEntryPredicate() {
+        return entry -> !entry.getValue().isEmpty();
+    }
+
+    private Function<String, SimpleEntry<String, ? extends Collection<Object>>> getEntryForKeyFunction(
+        JsonElement document) {
+        return key -> {
+            JsonSurfer surfer = JsonSurferGson.INSTANCE;
+            try {
+                return new SimpleEntry<>(key, surfer.collectAll(document.toString(), "$." + key));
+            } catch (ParseCancellationException e) {
+                LOGGER.log(Level.WARNING, "Invalid filter key: " + key, e);
+                return new SimpleEntry<>(key, Collections.emptyList());
+            }
+        };
+    }
+
+    private void closeStream(InputStream stream) throws IOException {
+        if (!Objects.isNull(stream) && !(stream.available() > 0)) {
+            stream.close();
+        }
+    }
+
+    @Override
+    public void close() throws IOException {
+        closeStream(inputStream);
+    }
+}