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  /*
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   * and Distribution License("CDDL") (collectively, the "License").  You
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 package com.sun.jersey.server.impl.uri.rules.automata;

Represents an arc (transition) between trie nodes.

Author(s):
Frank D. Martinez. fmartinez@asimovt.com
 
 public class TrieArc<T> {
    
    
Character that match this arc.
 
     protected char[] code;
    
    
Target node at the end of this arc.
 
     protected TrieNode<T> target;
    
    
Next alternative node if this node does not match.
 
     protected TrieArc<T> next;
    
    
Creates a new instance of TrieArc.

Parameters:
target Target node at the end of this arc.
code Matching character.
 
     public TrieArc(TrieNode<T> targetchar code) {
         this. = target;
         this. = new char[] {code};
     }
    
    
Merge neighbour nodes if they are degenerated trees.
 
     private void merge(TrieArc<T> arc) {
         int p = .;
         // Cannot depend on SE 6 specific features
         // code = Arrays.copyOf(code, code.length + arc.code.length);
          = copyOf(. + arc.code.length);
         System.arraycopy(arc.code, 0, parc.code.length);
         this. = arc.target;
         if (.getArcs() == 1 && !.hasValue() && !.isWildcard()) {
             merge(.getFirstArc());
         }
     }
    
    
Merge neighbour nodes if they are degenerated trees.
 
     public void pack() {
         if (.getArcs() == 1 && !.hasValue() && !.isWildcard()) {
             merge(.getFirstArc());
         }
         .pack();
     }
    
    
Number of characters to be consumed if this arc matches the input.
 
     public int length() {
         return .;
     }
    
    
Returns length() if this arc matches the input, 0 otherwise.
    public int match(CharSequence seqint i) {
        if (i+. > seq.length()) return 0;
        for (int j=0; j<.j++) {
            if ([j] != seq.charAt(i++)) return 0;
        }
        return .;
    }
    
    @Override public String toString() {
        if (.hasValue()) {
            return "ARC(" + new String() + ") --> " + .getPattern().getRegex();
        }
        else {
            return "ARC(" + new String() + ") --> null";
        }
    }
    
    // Copied from SE 6 source
    
Copies the specified array, truncating or padding with null characters (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain '\\u000'. Such indices will exist if and only if the specified length is greater than that of the original array.

Parameters:
original the array to be copied
newLength the length of the copy to be returned
Returns:
a copy of the original array, truncated or padded with null characters to obtain the specified length
Throws:
java.lang.NegativeArraySizeException if newLength is negative
java.lang.NullPointerException if original is null
Since:
1.6
    private static char[] copyOf(char[] originalint newLength) {
        char[] copy = new char[newLength];
        System.arraycopy(original, 0, copy, 0,
                         Math.min(original.lengthnewLength));
        return copy;
    }
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