liquibase.util.ObjectMethods Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of liquibase-core Show documentation

Liquibase is a tool for managing and executing database changes.

The newest version!

package liquibase.util;

import static java.util.Locale.ROOT;
import static java.util.stream.Collectors.toMap;

import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BinaryOperator;

final class ObjectMethods {

  private static final BinaryOperator ignoreMultipleMethodsWithSameName = (first, second) -> first;
  private final Map writeMethods;
  private final Map readMethods;

  ObjectMethods(Class klass) {
    this(klass.getMethods());
  }

  ObjectMethods(Method[] methods) {
    readMethods = new HashMap<>(methods.length);
    readMethods.putAll(find(methods, 0, "get"));
    readMethods.putAll(find(methods, 0, "is"));
    writeMethods = find(methods, 1, "set");
  }

  private Map find(Method[] methods, int parametersCount, String prefix) {
    return Arrays.stream(methods)
      .filter(m -> m.getParameterTypes().length == parametersCount)
      .filter(m -> m.getName().startsWith(prefix))
      .collect(toMap(m -> propertyName(m.getName(), prefix), m -> m, ignoreMultipleMethodsWithSameName));
  }

  private String propertyName(String methodName, String prefix) {
    int length = prefix.length();
    return methodName.substring(length, length + 1).toLowerCase(ROOT) + methodName.substring(length + 1);
  }

  Method getReadMethod(String propertyName) {
    return readMethods.get(propertyName);
  }

  Method getWriteMethod(String propertyName) {
    return writeMethods.get(propertyName);
  }

}