im.aop.loggers.messageinterpolation.IterableToStringStrategy Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of im-aop-loggers Show documentation

A handy and configurable sets of annotation-based loggers for Spring Boot that can log every execution of a method when entering or exiting normally or abnormally, without you writing a single line of code using aspect-oriented programming (AOP)

There is a newer version: 1.1.3

Show newest version

package im.aop.loggers.messageinterpolation;

import java.util.Iterator;

import org.springframework.beans.factory.annotation.Autowired;

/**
 * {@link ToStringStrategy} implementation for {@link Iterable}, using {@link
 * ObjectToStringStrategy} to return a String representation of the element. Encloses element within
 * square brackets "[]".
 *
 * @author Andy Lian
 */
public class IterableToStringStrategy implements ToStringStrategy {

  @Autowired private ObjectToStringStrategy objectToStringStrategy;

  @Override
  public boolean supports(Object object) {
    return object instanceof Iterable;
  }

  @Override
  public String toString(Object object) {
    return toString((Iterable) object);
  }

  private String toString(final Iterable iterable) {
    final Iterator iterator = iterable.iterator();
    if (iterator.hasNext() == false) {
      return "[]";
    }

    final StringBuilder builder = new StringBuilder("[");
    builder.append(toStringOrNullString(iterator.next()));
    while (iterator.hasNext()) {
      builder.append(", ");
      builder.append(toStringOrNullString(iterator.next()));
    }

    return builder.append("]").toString();
  }

  private Object toStringOrNullString(Object element) {
    return element == null ? "null" : objectToStringStrategy.toString(element);
  }
}