Examples of java.util.Comparator.compare()

java.util.Comparator.compare()
Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive.
The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)
The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.
Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.
It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." @param o1 the first object to be compared. @param o2 the second object to be compared. @return a negative integer, zero, or a positive integer as thefirst argument is less than, equal to, or greater than the second. @throws ClassCastException if the arguments' types prevent them frombeing compared by this comparator.

         */
        for ( Value<?> val : attr )
        {
            Value<?> normValue = normalizer.normalize( val );


            if ( 0 == comparator.compare( normValue.get(), filterValue.get() ) )
            {
                return true;
            }
        }

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        Comparator comparator = createComparator();


        if (null != comparator)
        {
            if (false == validateOperatorOnComparisonResult(operator, comparator.compare(value, foreignValue)))
            {
                throw new ValidatorException(MessageUtils.getMessage(FacesMessage.SEVERITY_ERROR, message, args));
            }
        }
        else if ( (value instanceof Comparable) && (foreignValue instanceof Comparable) )

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        Row previous = null;
        for (Iterator it = children.iterator(); it.hasNext();) {
          final Row row = (Row) it.next();
          it.remove();
          if (previous == null || cmprx.compare(previous, row) != 0) {
            //new group
            final List cells = row.getChildren();
            if (cells.size() < index)
              throw new IndexOutOfBoundsException(
                  "Index: "+index+" but size: "+ cells.size());

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        {
          Comparator comp = NodeLocationComparator.getInstance();
          // Currently the comparator deels with tags like taglib and
          // loadbundle particularly, comparasion result 0
          // means it didn't compare the tags.
          if (comp.compare(child, tag) < 0
              || (comp.compare(child, tag) == 0 && isSkippableChild(
                  headerContainer, child, COMMENT | EMPTY_TEXT
                      | HEADER))) {
            child = child.getNextSibling();
          } else {

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          Comparator comp = NodeLocationComparator.getInstance();
          // Currently the comparator deels with tags like taglib and
          // loadbundle particularly, comparasion result 0
          // means it didn't compare the tags.
          if (comp.compare(child, tag) < 0
              || (comp.compare(child, tag) == 0 && isSkippableChild(
                  headerContainer, child, COMMENT | EMPTY_TEXT
                      | HEADER))) {
            child = child.getNextSibling();
          } else {
            break;

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  public static void findHeaderInsertPosition(String uri, String tag,
      Node parent, Node[] ref) {
    Node child = parent.getFirstChild();
    while (child != null) {
      Comparator comp = NodeLocationComparator.getInstance();
      if (comp.compare(child, tag) < 0
          || (comp.compare(child, tag) == 0 && isSkippableChild(
              parent, child, COMMENT | EMPTY_TEXT | HEADER))) {
        child = child.getNextSibling();
      } else {
        break;

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      Node parent, Node[] ref) {
    Node child = parent.getFirstChild();
    while (child != null) {
      Comparator comp = NodeLocationComparator.getInstance();
      if (comp.compare(child, tag) < 0
          || (comp.compare(child, tag) == 0 && isSkippableChild(
              parent, child, COMMENT | EMPTY_TEXT | HEADER))) {
        child = child.getNextSibling();
      } else {
        break;
      }

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                final String versionString = 
                    projectFacetVersion.getVersionString();
                final Comparator comparator = 
                    projectFacetVersion.getProjectFacet().getVersionComparator();
                final int compareToMin = 
                    comparator.compare(versionString, minVersion);
                
                if (compareToMin >=0)
                {
                    return true;
                }

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                final String versionString = 
                    projectFacetVersion.getVersionString();
                final Comparator comparator = 
                    projectFacetVersion.getProjectFacet().getVersionComparator();
                final int compareToMin = 
                    comparator.compare(versionString, minVersion);
                
                if (compareToMin >=0)
                {
                    return true;
                }

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public class ToStringComparatorTests extends TestCase {


    public void testCompare() {
        Comparator comparator = new ToStringComparator();


        assertTrue(comparator.compare(new TestBean("a"), new TestBean("b")) < 0);
        assertTrue(comparator.compare(new TestBean("b"), new TestBean("a")) > 0);
        assertTrue(comparator.compare(new TestBean("a"), new TestBean("a")) == 0);
    }


}

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