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

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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)

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package im.aop.loggers.messageinterpolation;

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

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

  @Autowired private ObjectToStringStrategy objectToStringStrategy;

  @Override
  public boolean supports(Object object) {
    return object != null && object.getClass().isArray();
  }

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

  private String toString(final Object[] array) {
    final int maxIndex = array.length - 1;
    if (maxIndex == -1) {
      return "[]";
    }

    final StringBuilder builder = new StringBuilder("[");
    for (int index = 0; ; index++) {
      builder.append(toStringOrNullString(array[index]));
      if (index == maxIndex) {
        return builder.append("]").toString();
      }

      builder.append(", ");
    }
  }

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