Coverage Report - org.mule.util.CollectionUtils
 
Classes in this File Line Coverage Branch Coverage Complexity
CollectionUtils
0%
0/59
0%
0/40
0
CollectionUtils$1
0%
0/2
0%
0/4
0
CollectionUtils$2
0%
0/2
0%
0/4
0
 
 1  
 /*
 2  
  * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 3  
  * The software in this package is published under the terms of the CPAL v1.0
 4  
  * license, a copy of which has been included with this distribution in the
 5  
  * LICENSE.txt file.
 6  
  */
 7  
 package org.mule.util;
 8  
 
 9  
 import java.lang.reflect.Array;
 10  
 import java.util.Collection;
 11  
 import java.util.Iterator;
 12  
 import java.util.LinkedList;
 13  
 import java.util.List;
 14  
 
 15  
 import org.apache.commons.collections.Predicate;
 16  
 
 17  
 
 18  
 // @ThreadSafe
 19  0
 public class CollectionUtils extends org.apache.commons.collections.CollectionUtils
 20  
 {
 21  
 
 22  
     /**
 23  
      * Creates an array of the given Collection's elements, but with the given
 24  
      * <code>Class</code> as element type. Useful for arrays of objects that
 25  
      * implement multiple interfaces and a "typed view" onto these objects is
 26  
      * required.
 27  
      * 
 28  
      * @param objects a Collection of objects
 29  
      * @param clazz the desired service type of the new array
 30  
      * @return <code>null</code> when objects is <code>null</code>, or a new
 31  
      *         array containing the elements of the source array which is typed to
 32  
      *         the given <code>clazz</code> parameter.
 33  
      * @throws IllegalArgumentException if the <code>clazz</code> argument is
 34  
      *             <code>null</code>.
 35  
      * @throws ArrayStoreException if the elements in <code>objects</code> cannot
 36  
      *             be cast to <code>clazz</code>.
 37  
      */
 38  
     public static <T>T[] toArrayOfComponentType(Collection objects, Class<T> clazz)
 39  
     {
 40  0
         if (objects == null)
 41  
         {
 42  0
             return null;
 43  
         }
 44  
 
 45  0
         if (clazz == null)
 46  
         {
 47  0
             throw new IllegalArgumentException("Array target class must not be null");
 48  
         }
 49  
 
 50  0
         if (objects.isEmpty())
 51  
         {
 52  0
             return (T[]) Array.newInstance(clazz, 0);
 53  
         }
 54  
 
 55  0
         int i = 0, size = objects.size();
 56  0
         T[] result = (T[]) Array.newInstance(clazz, size);
 57  0
         Iterator iter = objects.iterator();
 58  
 
 59  0
         while (i < size && iter.hasNext())
 60  
         {
 61  0
             result[i++] = (T)iter.next();
 62  
         }
 63  
 
 64  0
         return result;
 65  
     }
 66  
 
 67  
     /**
 68  
      * Creates a String representation of the given Collection, with optional
 69  
      * newlines between elements. Class objects are represented by their full names.
 70  
      * 
 71  
      * @param c the Collection to format
 72  
      * @param newline indicates whether elements are to be split across lines
 73  
      * @return the formatted String
 74  
      */
 75  
     public static String toString(Collection c, boolean newline)
 76  
     {
 77  0
         if (c == null || c.isEmpty())
 78  
         {
 79  0
             return "[]";
 80  
         }
 81  
 
 82  0
         return toString(c, c.size(), newline);
 83  
     }
 84  
 
 85  
     /**
 86  
      * Calls {@link #toString(Collection, int, boolean)} with <code>false</code>
 87  
      * for newline.
 88  
      */
 89  
     public static String toString(Collection c, int maxElements)
 90  
     {
 91  0
         return toString(c, maxElements, false);
 92  
     }
 93  
 
 94  
     /**
 95  
      * Creates a String representation of the given Collection, with optional
 96  
      * newlines between elements. Class objects are represented by their full names.
 97  
      * Considers at most <code>maxElements</code> values; overflow is indicated by
 98  
      * an appended "[..]" ellipsis.
 99  
      * 
 100  
      * @param c the Collection to format
 101  
      * @param maxElements the maximum number of elements to take into account
 102  
      * @param newline indicates whether elements are to be split across lines
 103  
      * @return the formatted String
 104  
      */
 105  
     public static String toString(Collection c, int maxElements, boolean newline)
 106  
     {
 107  0
         if (c == null || c.isEmpty())
 108  
         {
 109  0
             return "[]";
 110  
         }
 111  
 
 112  0
         int origNumElements = c.size();
 113  0
         int numElements = Math.min(origNumElements, maxElements);
 114  0
         boolean tooManyElements = (origNumElements > maxElements);
 115  
 
 116  0
         StringBuffer buf = new StringBuffer(numElements * 32);
 117  0
         buf.append('[');
 118  
 
 119  0
         if (newline)
 120  
         {
 121  0
             buf.append(SystemUtils.LINE_SEPARATOR);
 122  
         }
 123  
 
 124  0
         Iterator items = c.iterator();
 125  0
         for (int i = 0; i < numElements - 1; i++)
 126  
         {
 127  0
             Object item = items.next();
 128  
 
 129  0
             if (item instanceof Class)
 130  
             {
 131  0
                 buf.append(((Class) item).getName());
 132  
             }
 133  
             else
 134  
             {
 135  0
                 buf.append(item);
 136  
             }
 137  
 
 138  0
             if (newline)
 139  
             {
 140  0
                 buf.append(SystemUtils.LINE_SEPARATOR);
 141  
             }
 142  
             else
 143  
             {
 144  0
                 buf.append(',').append(' ');
 145  
             }
 146  
         }
 147  
 
 148  
         // don't forget the last one
 149  0
         Object lastItem = items.next();
 150  0
         if (lastItem instanceof Class)
 151  
         {
 152  0
             buf.append(((Class) lastItem).getName());
 153  
         }
 154  
         else
 155  
         {
 156  0
             buf.append(lastItem);
 157  
         }
 158  
 
 159  0
         if (newline)
 160  
         {
 161  0
             buf.append(SystemUtils.LINE_SEPARATOR);
 162  
         }
 163  
 
 164  0
         if (tooManyElements)
 165  
         {
 166  0
             buf.append(" [..]");
 167  
         }
 168  
 
 169  0
         buf.append(']');
 170  0
         return buf.toString();
 171  
     }
 172  
 
 173  
     /**
 174  
      * Some code uses null to indicate "unset", which makes appending items complex.
 175  
      */
 176  
     public static List addCreate(List list, Object value)
 177  
     {
 178  0
         if (null == list)
 179  
         {
 180  0
             return singletonList(value);
 181  
         }
 182  
         else
 183  
         {
 184  0
             list.add(value);
 185  0
             return list;
 186  
         }
 187  
     }
 188  
 
 189  
     public static List singletonList(Object value)
 190  
     {
 191  0
         List list = new LinkedList();
 192  0
         list.add(value);
 193  0
         return list;
 194  
     }
 195  
     
 196  
     public static boolean containsType(Collection<?> collection, final Class<?> type)
 197  
     {
 198  0
         if (type == null)
 199  
         {
 200  0
             return false;
 201  
         }
 202  0
         return exists(collection, new Predicate()
 203  0
         {
 204  
             public boolean evaluate(Object object)
 205  
             {
 206  0
                 return object != null && type.isAssignableFrom(object.getClass());
 207  
             }
 208  
         });
 209  
     }
 210  
     
 211  
     public static void removeType(Collection<?> collection, final Class<?> type)
 212  
     {
 213  0
         if (type == null)
 214  
         {
 215  0
             return;
 216  
         }
 217  0
         filter(collection, new Predicate()
 218  0
         {
 219  
             public boolean evaluate(Object object)
 220  
             {
 221  0
                 return object != null && type.isAssignableFrom(object.getClass());
 222  
             }
 223  
         });
 224  0
     }
 225  
 
 226  
 }