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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.ling.tokensregex;

import edu.stanford.nlp.ling.AnnotationLookup;
import edu.stanford.nlp.ling.CoreAnnotations;
import edu.stanford.nlp.ling.tokensregex.types.Value;
import edu.stanford.nlp.pipeline.CoreMapAggregator;
import edu.stanford.nlp.pipeline.CoreMapAttributeAggregator;
import java.util.function.Function;

import java.util.List;
import java.util.Map;

/**
 * Provides lookup functions using an Env
 *
 * @author Angel Chang
 */
public class EnvLookup {

  private EnvLookup() {} // static methods

  // TODO: For additional keys, read map of name to Class from file???
  public static Class lookupAnnotationKey(Env env, String name)
  {
    if (env != null) {
      Object obj = env.get(name);
      if (obj != null) {
        if (obj instanceof Class) {
          return (Class) obj;
        } else if (obj instanceof Value) {
          obj = ((Value) obj).get();
          if (obj instanceof Class) {
            return (Class) obj;
          }
        }
      }
    }
    return AnnotationLookup.toCoreKey(name);
  }

  public static Class lookupAnnotationKeyWithClassname(Env env, String name) {
    Class annotationKey = lookupAnnotationKey(env, name);
    if (annotationKey == null) {
      try {
        Class clazz = Class.forName(name);
        return clazz;
      } catch (ClassNotFoundException ex) {
      }
      return null;
    } else {
      return annotationKey;
    }
  }

  public static Map getDefaultTokensAggregators(Env env)
  {
    if (env != null) {
      Map obj = env.getDefaultTokensAggregators();
      if (obj != null) {
        return obj;
      }
    }
    return CoreMapAttributeAggregator.DEFAULT_NUMERIC_TOKENS_AGGREGATORS;
  }

  public static CoreMapAggregator getDefaultTokensAggregator(Env env)
  {
    if (env != null) {
      CoreMapAggregator obj = env.getDefaultTokensAggregator();
      if (obj != null) {
        return obj;
      }
    }
    return CoreMapAggregator.DEFAULT_NUMERIC_TOKENS_AGGREGATOR;
  }

  public static List getDefaultTokensResultAnnotationKey(Env env)
  {
    if (env != null) {
      List obj = env.getDefaultTokensResultAnnotationKey();
      if (obj != null) {
        return obj;
      }
    }
    return null;
  }

  public static List getDefaultResultAnnotationKey(Env env)
  {
    if (env != null) {
      List obj = env.getDefaultResultAnnotationKey();
      if (obj != null) {
        return obj;
      }
    }
    return null;
  }

  public static Function getDefaultResultAnnotationExtractor(Env env)
  {
    if (env != null) {
      Function obj = env.getDefaultResultsAnnotationExtractor();
      if (obj != null) {
        return obj;
      }
    }
    return null;
  }

  public static Class getDefaultNestedResultsAnnotationKey(Env env)
  {
    if (env != null) {
      Class obj = env.getDefaultNestedResultsAnnotationKey();
      if (obj != null) {
        return obj;
      }
    }
    return null;
  }

  public static Class getDefaultTextAnnotationKey(Env env)
  {
    if (env != null) {
      Class obj = env.getDefaultTextAnnotationKey();
      if (obj != null) {
        return obj;
      }
    }
    return CoreAnnotations.TextAnnotation.class;
  }

  public static Class getDefaultTokensAnnotationKey(Env env)
  {
    if (env != null) {
      Class obj = env.getDefaultTokensAnnotationKey();
      if (obj != null) {
        return obj;
      }
    }
    return CoreAnnotations.TokensAnnotation.class;
  }

}