rzo1 commented on code in PR #775:
URL: https://github.com/apache/opennlp/pull/775#discussion_r2066593502


##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelLoader.java:
##########
@@ -59,4 +66,75 @@ public ClassPathModel load(ClassPathModelEntry entry) throws 
IOException {
 
     return new ClassPathModel(properties, model);
   }
+
+  /**
+   * Restores a {@link T model} among a set {@link ClassPathModelEntry 
classpath entries}
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param classPathEntries A non-empty set of {@link ClassPathModelEntry 
candidates} to find a matching
+   *                         model in. Must not be {@code null}. If it is 
empty, the result will
+   *                         be {@code null}.
+   * @param lang      The language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The {@link ModelType} to select the model variant.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.
+   *
+   * @return An model instance of type {@link T}, or {@code null} if no match 
was found
+   *         for the specified parameters.
+   *         
+   * @throws IllegalArgumentException Thrown if parameters were invalid.
+   * @throws ClassPathLoaderException Thrown if {@link T} could not be 
instantiated correctly.
+   * @throws IOException Thrown if something went wrong during reading 
resources from the classpath.
+   */
+  <T extends BaseModel> T load(Set<ClassPathModelEntry> classPathEntries, 
String lang,
+                               ModelType type, Class<T> modelType) throws 
IOException {
+    return load(classPathEntries, lang, type.getName(), modelType);

Review Comment:
   Possible NPE. `type` needs a check because `getName()` would be invoked on 
NULL.



##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelLoader.java:
##########
@@ -59,4 +66,75 @@ public ClassPathModel load(ClassPathModelEntry entry) throws 
IOException {
 
     return new ClassPathModel(properties, model);
   }
+
+  /**
+   * Restores a {@link T model} among a set {@link ClassPathModelEntry 
classpath entries}
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param classPathEntries A non-empty set of {@link ClassPathModelEntry 
candidates} to find a matching
+   *                         model in. Must not be {@code null}. If it is 
empty, the result will
+   *                         be {@code null}.
+   * @param lang      The language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The {@link ModelType} to select the model variant.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.
+   *
+   * @return An model instance of type {@link T}, or {@code null} if no match 
was found
+   *         for the specified parameters.
+   *         
+   * @throws IllegalArgumentException Thrown if parameters were invalid.
+   * @throws ClassPathLoaderException Thrown if {@link T} could not be 
instantiated correctly.
+   * @throws IOException Thrown if something went wrong during reading 
resources from the classpath.
+   */
+  <T extends BaseModel> T load(Set<ClassPathModelEntry> classPathEntries, 
String lang,
+                               ModelType type, Class<T> modelType) throws 
IOException {
+    return load(classPathEntries, lang, type.getName(), modelType);
+  }
+
+  /**
+   * Restores a {@link T model} among a set {@link ClassPathModelEntry 
classpath entries}
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param classPathEntries A non-empty set of {@link ClassPathModelEntry 
candidates} to find a matching
+   *                         model in. Must not be {@code null}. If it is 
empty, the result will
+   *                         be {@code null}.
+   * @param lang      The language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns
+   *                  can be applied here, as the {@code type} fragment will 
be used for a 'contains'
+   *                  check internally.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.
+   *
+   * @return An model instance of type {@link T}, or {@code null} if no match 
was found
+   *         for the specified parameters.
+   *         
+   * @throws IllegalArgumentException Thrown if parameters were invalid.
+   * @throws ClassPathLoaderException Thrown if {@link T} could not be 
instantiated correctly.
+   * @throws IOException Thrown if something went wrong during reading 
resources from the classpath.
+   */
+  <T extends BaseModel> T load(Set<ClassPathModelEntry> classPathEntries, 
String lang,
+                               String type, Class<T> modelType) throws 
IOException {
+    if (classPathEntries == null) {
+      throw new IllegalArgumentException("The provided ClassPath entries must 
not be null!");
+    }
+    T result = null;
+    if (classPathEntries.isEmpty()) {
+      return result;
+    }
+    try {
+      for (ClassPathModelEntry entry : classPathEntries) {
+        final ClassPathModel cpm = load(entry);
+        if (cpm != null && cpm.getModelLanguage().equals(lang) && 
cpm.getModelName().contains(type)) {
+          try (InputStream is = new BufferedInputStream(new 
ByteArrayInputStream(cpm.model()))) {
+            result = 
modelType.getConstructor(InputStream.class).newInstance(is);

Review Comment:
   `modelType` needs a check for != null (also in Javadoc)



##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelProvider.java:
##########
@@ -0,0 +1,77 @@
+/*
+ * 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 opennlp.tools.models;
+
+import java.io.IOException;
+
+import opennlp.tools.util.model.BaseModel;
+
+/**
+ * A provider for obtaining pre-trained OpenNLP {@link BaseModel models} from
+ * an application's classpath.
+ * <p>
+ * Providing models available in the classpath requires a {@link 
ClassPathModelFinder finder}
+ * and a {@link ClassPathModelLoader} at runtime. Depending on the environment,
+ * a custom {@code finder} can be used.
+ *
+ * @see BaseModel
+ * @see ClassPathModelFinder
+ * @see ClassPathModelLoader
+ */
+public interface ClassPathModelProvider {
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns
+   *                  can be applied here, as the {@code type} fragment will 
be used for a 'contains'
+   *                  check internally.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.

Review Comment:
   `It must not be {@code null}.`



##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelProvider.java:
##########
@@ -0,0 +1,77 @@
+/*
+ * 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 opennlp.tools.models;
+
+import java.io.IOException;
+
+import opennlp.tools.util.model.BaseModel;
+
+/**
+ * A provider for obtaining pre-trained OpenNLP {@link BaseModel models} from
+ * an application's classpath.
+ * <p>
+ * Providing models available in the classpath requires a {@link 
ClassPathModelFinder finder}
+ * and a {@link ClassPathModelLoader} at runtime. Depending on the environment,
+ * a custom {@code finder} can be used.
+ *
+ * @see BaseModel
+ * @see ClassPathModelFinder
+ * @see ClassPathModelLoader
+ */
+public interface ClassPathModelProvider {
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns
+   *                  can be applied here, as the {@code type} fragment will 
be used for a 'contains'
+   *                  check internally.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.
+   *
+   * @return An model instance of type {@link T}, or {@code null} if no match 
was found
+   *         for the specified parameters.
+   * @throws IllegalArgumentException Thrown if parameters were invalid.
+   * @throws IOException Thrown if something went wrong during reading 
resources from the classpath.
+   */
+  <T extends BaseModel> T load(String lang, ModelType type, Class<T> modelType)
+          throws IOException;
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will

Review Comment:
   What happens if emptry string?



##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelProvider.java:
##########
@@ -0,0 +1,77 @@
+/*
+ * 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 opennlp.tools.models;
+
+import java.io.IOException;
+
+import opennlp.tools.util.model.BaseModel;
+
+/**
+ * A provider for obtaining pre-trained OpenNLP {@link BaseModel models} from
+ * an application's classpath.
+ * <p>
+ * Providing models available in the classpath requires a {@link 
ClassPathModelFinder finder}
+ * and a {@link ClassPathModelLoader} at runtime. Depending on the environment,
+ * a custom {@code finder} can be used.
+ *
+ * @see BaseModel
+ * @see ClassPathModelFinder
+ * @see ClassPathModelLoader
+ */
+public interface ClassPathModelProvider {
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will

Review Comment:
   What happens if empty string?



##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelProvider.java:
##########
@@ -0,0 +1,77 @@
+/*
+ * 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 opennlp.tools.models;
+
+import java.io.IOException;
+
+import opennlp.tools.util.model.BaseModel;
+
+/**
+ * A provider for obtaining pre-trained OpenNLP {@link BaseModel models} from
+ * an application's classpath.
+ * <p>
+ * Providing models available in the classpath requires a {@link 
ClassPathModelFinder finder}
+ * and a {@link ClassPathModelLoader} at runtime. Depending on the environment,
+ * a custom {@code finder} can be used.
+ *
+ * @see BaseModel
+ * @see ClassPathModelFinder
+ * @see ClassPathModelLoader
+ */
+public interface ClassPathModelProvider {
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns
+   *                  can be applied here, as the {@code type} fragment will 
be used for a 'contains'
+   *                  check internally.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.
+   *
+   * @return An model instance of type {@link T}, or {@code null} if no match 
was found
+   *         for the specified parameters.
+   * @throws IllegalArgumentException Thrown if parameters were invalid.
+   * @throws IOException Thrown if something went wrong during reading 
resources from the classpath.
+   */
+  <T extends BaseModel> T load(String lang, ModelType type, Class<T> modelType)
+          throws IOException;
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns
+   *                  can be applied here, as the {@code type} fragment will 
be used for a 'contains'
+   *                  check internally.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.

Review Comment:
   `It must not be {@code null}.`



##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelProvider.java:
##########
@@ -0,0 +1,77 @@
+/*
+ * 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 opennlp.tools.models;
+
+import java.io.IOException;
+
+import opennlp.tools.util.model.BaseModel;
+
+/**
+ * A provider for obtaining pre-trained OpenNLP {@link BaseModel models} from
+ * an application's classpath.
+ * <p>
+ * Providing models available in the classpath requires a {@link 
ClassPathModelFinder finder}
+ * and a {@link ClassPathModelLoader} at runtime. Depending on the environment,
+ * a custom {@code finder} can be used.
+ *
+ * @see BaseModel
+ * @see ClassPathModelFinder
+ * @see ClassPathModelLoader
+ */
+public interface ClassPathModelProvider {
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns
+   *                  can be applied here, as the {@code type} fragment will 
be used for a 'contains'
+   *                  check internally.
+   * @param modelType The class of model type parameter {@link T} to create an 
instance of.
+   *
+   * @return An model instance of type {@link T}, or {@code null} if no match 
was found
+   *         for the specified parameters.
+   * @throws IllegalArgumentException Thrown if parameters were invalid.
+   * @throws IOException Thrown if something went wrong during reading 
resources from the classpath.
+   */
+  <T extends BaseModel> T load(String lang, ModelType type, Class<T> modelType)
+          throws IOException;
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns

Review Comment:
   `type` is not a string here. Most likely a ref towards `ModelType` ?



##########
opennlp-tools-models/src/main/java/opennlp/tools/models/ClassPathModelProvider.java:
##########
@@ -0,0 +1,77 @@
+/*
+ * 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 opennlp.tools.models;
+
+import java.io.IOException;
+
+import opennlp.tools.util.model.BaseModel;
+
+/**
+ * A provider for obtaining pre-trained OpenNLP {@link BaseModel models} from
+ * an application's classpath.
+ * <p>
+ * Providing models available in the classpath requires a {@link 
ClassPathModelFinder finder}
+ * and a {@link ClassPathModelLoader} at runtime. Depending on the environment,
+ * a custom {@code finder} can be used.
+ *
+ * @see BaseModel
+ * @see ClassPathModelFinder
+ * @see ClassPathModelLoader
+ */
+public interface ClassPathModelProvider {
+
+  /**
+   * Restores a {@link T model} among all classpath models at runtime
+   * according to the specified parameters {@code lang} and {@code type}.
+   *
+   * @param lang      The ISO language code of the requested model. If {@code 
null}, the result will
+   *                  be {@code null} as well.
+   * @param type      The type string to narrow down the model variant. Note: 
Custom naming patterns

Review Comment:
   type is not a string here.



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