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ebean core module

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package io.ebeaninternal.server.el;

import io.ebean.bean.EntityBean;

import java.util.Comparator;

/**
 * Comparator based on a ElGetValue.
 */
public final class ElComparatorProperty implements Comparator, ElComparator {

  private static final long serialVersionUID = -2735738237263956073L;

  private final ElPropertyValue elGetValue;
  private final int nullOrder;
  private final int asc;

  public ElComparatorProperty(ElPropertyValue elGetValue, boolean ascending, boolean nullsHigh) {
    this.elGetValue = elGetValue;
    this.asc = ascending ? 1 : -1;
    this.nullOrder = asc * (nullsHigh ? 1 : -1);
  }

  @Override
  public int compare(T o1, T o2) {
    Object val1 = elGetValue.pathGet(o1);
    Object val2 = elGetValue.pathGet(o2);
    return compareValues(val1, val2);
  }

  @Override
  public int compareValue(Object value, T o2) {
    Object val2 = elGetValue.pathGet(o2);
    return compareValues(value, val2);
  }

  @SuppressWarnings({"unchecked", "rawtypes"})
  public int compareValues(Object val1, Object val2) {
    if (val1 == null) {
      return val2 == null ? 0 : nullOrder;
    }
    if (elGetValue.isAssocId()) {
      val1 = elGetValue.assocIdValues((EntityBean) val1)[0]; // TODO: compound key not yet supported
    }
    if (val2 == null) {
      return -1 * nullOrder;
    }
    if (elGetValue.isAssocId()) {
      val2 = elGetValue.assocIdValues((EntityBean) val2)[0];
    }
    Comparable c = (Comparable) val1;
    return asc * c.compareTo(val2);
  }

}