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From morg...@apache.org
Subject cvs commit: jakarta-commons/collections/src/java/org/apache/commons/collections/comparators ComparableComparator.java NumericStringComparator.java PackageNameComparator.java ReverseComparator.java UrlComparator.java
Date Tue, 26 Feb 2002 22:42:31 GMT
morgand     02/02/26 14:42:31

  Added:       collections/src/java/org/apache/commons/collections/comparators
                        ComparableComparator.java
                        NumericStringComparator.java
                        PackageNameComparator.java ReverseComparator.java
                        UrlComparator.java
  Log:
  comparators moved from the commons-sandbox/util component
  
  Revision  Changes    Path
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/comparators/ComparableComparator.java
  
  Index: ComparableComparator.java
  ===================================================================
  package org.apache.commons.collections.comparators;
  
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Commons" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Turbine", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.util.Comparator;
  import java.lang.Comparable;
  
  /**
   * A Comparator that compares Comparable objects.
   * Throws ClassCastExceptions if the objects are not 
   * Comparable, or if they are null.
   * Throws ClassCastException if the compareTo of both 
   * objects do not provide an inverse result of each other 
   * as per the Comparable javadoc.
   *
   * @author bayard@generationjava.com
   * @version $Id: ComparableComparator.java,v 1.1 2002/02/26 22:42:31 morgand Exp $
   */
  public class ComparableComparator implements Comparator {
  
      public ComparableComparator() {
      }
  
      public int compare(Object o1, Object o2) {
          if( (o1 == null) || (o2 == null) ) {
              throw new ClassCastException(
                  "There were nulls in the arguments for this method: "+
                  "compare("+o1 + ", " + o2 + ")"
                  );
          }
          
          if(o1 instanceof Comparable) {
              if(o2 instanceof Comparable) {
                  int result1 = ((Comparable)o1).compareTo(o2);
                  int result2 = ((Comparable)o2).compareTo(o1);
  
                  // enforce comparable contract
                  if(result1 == 0 && result2 == 0) {
                      return 0;
                  } else
                  if(result1 < 0 && result2 > 0) {
                      return result1;
                  } else
                  if(result1 > 0 && result2 < 0) {
                      return result1;
                  } else {
                      // results inconsistent
                      throw new ClassCastException("o1 not comparable to o2");
                  }
              } else {
                  // o2 wasn't comparable
                  throw new ClassCastException(
                      "The first argument of this method was not a Comparable: " +
                      o2.getClass().getName()
                      );
              }
          } else 
          if(o2 instanceof Comparable) {
              // o1 wasn't comparable
              throw new ClassCastException(
                  "The second argument of this method was not a Comparable: " +
                  o1.getClass().getName()
                  );
          } else {
              // neither were comparable
              throw new ClassCastException(
                  "Both arguments of this method were not Comparables: " +
                  o1.getClass().getName() + " and " + o2.getClass().getName()
                  );
          }
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/comparators/NumericStringComparator.java
  
  Index: NumericStringComparator.java
  ===================================================================
  package org.apache.commons.collections.comparators;
  
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Commons" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Turbine", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.util.Comparator;
  
  /**
   * A Comparator which deals with alphabet characters 'naturally', but 
   * deals with numerics numerically. Leading 0's are ignored numerically,
   * but do come into play if the number is equal. Thus aaa119yyyy comes before 
   * aaa0119xxxx regardless of x or y.
   *
   * The comparison should be very performant as it only ever deals with 
   * issues at a character level and never tries to consider the 
   * numerics as numbers.
   *
   * @author bayard@generationjava.com
   * @version $Id: NumericStringComparator.java,v 1.1 2002/02/26 22:42:31 morgand Exp $
   */
  public class NumericStringComparator implements Comparator {
  
      public NumericStringComparator() {
      }
  
      public int compare(Object o1, Object o2) {
          if(o1 == null) {
              return 1;
          } else
          if(o2 == null) {
              return -1;
          }
  
          String s1 = o1.toString();
          String s2 = o2.toString();
  
          // find the first digit.
          int idx1 = getFirstDigitIndex(s1);
          int idx2 = getFirstDigitIndex(s2);
  
          if( ( idx1 == -1 )   || 
              ( idx2 == -1 ) ||
              ( !s1.substring(0,idx1).equals(s2.substring(0,idx2)) )
            )
          {
              return s1.compareTo(s2);
          }
  
          // find the last digit
          int edx1 = getLastDigitIndex(s1, idx1);
          int edx2 = getLastDigitIndex(s2, idx2);
  
          String sub1 = null;
          String sub2 = null;
  
          if(edx1 == -1) {
              sub1 = s1.substring(idx1);
          } else {
              sub1 = s1.substring(idx1, edx1);
          }
  
          if(edx2 == -1) {
              sub2 = s2.substring(idx2);
          } else {
              sub2 = s2.substring(idx2, edx2);
          }
  
          // deal with zeros at start of each number
          int zero1 = countZeroes(sub1);
          int zero2 = countZeroes(sub2);
  
          sub1 = sub1.substring(zero1);
          sub2 = sub2.substring(zero2);
  
          // if equal, then recurse with the rest of the string
          // need to deal with zeroes so that 00119 appears after 119
          if(sub1.equals(sub2)) {
              int ret = 0;
              if(zero1 > zero2) {
                  ret = 1;
              } else
              if(zero1 < zero2) {
                  ret = -1;
              }
              if(edx1 != -1) {
                  int comp = compare(s1.substring(edx1), s2.substring(edx2));
                  if(comp != 0) {
                      ret = comp;
                  }
              }
              return ret;
          } else {
              // if a numerical string is smaller in length than another
              // then it must be less. 
              if(sub1.length() != sub2.length()) {
                  return ( sub1.length() < sub2.length() ) ? -1 : 1;
              }
          }
  
  
          // now we get to do the string based numerical thing :)
          // going to assume that the individual character for the 
          // number has the right order. ie) '9' > '0'
          // possibly bad in i18n.
          char[] chr1 = sub1.toCharArray();
          char[] chr2 = sub2.toCharArray();
  
          int sz = chr1.length;
          for(int i=0; i<sz; i++) {
              // this should give better speed
              if(chr1[i] != chr2[i]) {
                  return (chr1[i] < chr2[i]) ? -1 : 1;
              }
          }
  
          return 0;
      }
  
      /// TODO: Consider moving these to a lang helper class.
      private int getFirstDigitIndex(String str) {
          return getFirstDigitIndex(str, 0);
      }
      private int getFirstDigitIndex(String str, int start) {
          return getFirstDigitIndex(str.toCharArray(), start);
      }
      // Get the index of the first digit (number) in the array 
      // of characters, starting at the specified digit.
      private int getFirstDigitIndex(char[] chrs, int start) {
          int sz = chrs.length;
  
          for(int i=start; i<sz; i++) {
              if(Character.isDigit(chrs[i])) {
                  return i;
              }
          }
  
          return -1;
      }
  
      private int getLastDigitIndex(String str, int start) {
          return getLastDigitIndex(str.toCharArray(), start);
      }
      // Get the index of the digit at the end of a collection 
      // of digit characters in a character array, starting 
      // at the provided start index.
      private int getLastDigitIndex(char[] chrs, int start) {
          int sz = chrs.length;
  
          for(int i=start; i<sz; i++) {
              if(!Character.isDigit(chrs[i])) {
                  return i;
              }
          }
  
          return -1;
      }
  
      public int countZeroes(String str) {
          int count = 0;
  
          // assuming str is small...
          for(int i=0; i<str.length(); i++) {
              if(str.charAt(i) == '0') {
                  count++;
              } else {
                  break;
              }
          }
  
          return count;
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/comparators/PackageNameComparator.java
  
  Index: PackageNameComparator.java
  ===================================================================
  package org.apache.commons.collections.comparators;
  
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Commons" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Turbine", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.util.Comparator;
  
  /**
   * Sorts java package names.
   * Packages are grouped into java, javax, and other.
   * Inside each one they are alphabetical.
   *
   * @author bayard@generationjava.com
   * @version $Id: PackageNameComparator.java,v 1.1 2002/02/26 22:42:31 morgand Exp $
   */
  public class PackageNameComparator implements Comparator {
  
      static private int JAVA = 1;
      static private int JAVAX = 2;
      static private int OTHER = 3;
  
      public int compare(Object obj1, Object obj2) {
          if( (obj1 instanceof String) && (obj2 instanceof String) ) {
              String str1 = (String)obj1;
              String str2 = (String)obj2;
              int type1 = getType(str1);
              int type2 = getType(str2);
              
              if(type1 == JAVA) {
                  if(type2 == JAVA) {
                      str1 = str1.substring(4);
                      str2 = str2.substring(4);
                  } else {
                      return -1;
                  }
              } else
              if(type2 == JAVA) {
                  return 1;
              } else
              if(type1 == JAVAX) {
                  if(type2 == JAVAX) {
                      str1 = str1.substring(5);
                      str2 = str2.substring(5);
                  } else {
                      return -1;
                  }
              } else
              if(type2 == JAVAX) {
                  return 1;
              }
  
              return str1.compareTo(str2);
          } else {
              return 0;
          }
      }
  
      private static int getType(String str) {
          if(str.startsWith("java")) {
              if(str.charAt(4) == '.') {
                  return JAVA;
              } else 
              if( (str.charAt(4) == 'x') && (str.charAt(5) == '.') ) {
                  return JAVAX;
              }            
          }
          return OTHER;
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/comparators/ReverseComparator.java
  
  Index: ReverseComparator.java
  ===================================================================
  package org.apache.commons.collections.comparators;
  
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Commons" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Turbine", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.util.Comparator;
  
  /**
   * Reverses the order of another comparator.
   *
   * @author bayard@generationjava.com
   * @version $Id: ReverseComparator.java,v 1.1 2002/02/26 22:42:31 morgand Exp $
   */
  public class ReverseComparator implements Comparator {
  
      private Comparator comparator;
  
      /**
       * Creates a reverse comparator that will invert any list.
       */
      public ReverseComparator() {
      }
  
      /**
       * Creates a reverse comparator that inverts the comparison 
       * of the passed in comparator.
       */
      public ReverseComparator(Comparator comparator) {
          this.comparator = comparator;
      }
  
      public int compare(Object o1, Object o2) {
          if(comparator == null) {
              return -1;
          } else {
              return -1*comparator.compare(o1,o2);
          }
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/comparators/UrlComparator.java
  
  Index: UrlComparator.java
  ===================================================================
  package org.apache.commons.collections.comparators;
  
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Commons" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Turbine", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.util.Comparator;
  import java.net.URL;
  
  /**
   * Compares URLs. Initially ignores protocol, so 
   * ftp://sun.com and * http://sun.com will compare 
   * near each other. Also pays attention to ports last, so 
   * http://www:8080/index.html and http://www/index.html 
   * will sort near each other.
   *
   * @author bayard@generationjava.com
   * @version $Id: UrlComparator.java,v 1.1 2002/02/26 22:42:31 morgand Exp $
   */
  public class UrlComparator implements Comparator {
  
      public UrlComparator() {
      }
  
      public int compare(Object o1, Object o2) {
          if( (o1 instanceof URL) && (o2 instanceof URL)) {
              URL u1 = (URL)o1;
              URL u2 = (URL)o2;
              int ret = 0;
  
              ret = u1.getHost().compareTo(u2.getHost());
              if(ret != 0) {
                  return ret;
              }
  
              ret = u1.getPath().compareTo(u2.getPath());
              if(ret != 0) {
                  return ret;
              }
  
              ret = u1.getProtocol().compareTo(u2.getProtocol());
              if(ret != 0) {
                  return ret;
              }
  
              if(u1.getPort() < u2.getPort()) {
                  return -1;
              } else
              if(u1.getPort() < u2.getPort()) {
                  return 1;
              }
  
          }
  
          return 0;
      }
  
  }
  
  
  

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