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package com.sun.jersey.server.impl.uri.rules.automata;
/**
* Represents an arc (transition) between trie nodes.
* @author Frank D. Martinez. [email protected]
*/
public class TrieArc {
/** Character that match this arc. */
protected char[] code;
/** Target node at the end of this arc. */
protected TrieNode target;
/** Next alternative node if this node does not match. */
protected TrieArc next;
/**
* Creates a new instance of TrieArc.
* @param target Target node at the end of this arc.
* @param code Matching character.
*/
public TrieArc(TrieNode target, char code) {
this.target = target;
this.code = new char[] {code};
}
/**
* Merge neighbour nodes if they are degenerated trees.
*/
private void merge(TrieArc arc) {
int p = code.length;
// Cannot depend on SE 6 specific features
// code = Arrays.copyOf(code, code.length + arc.code.length);
code = copyOf(code, code.length + arc.code.length);
System.arraycopy(arc.code, 0, code, p, arc.code.length);
this.target = arc.target;
if (target.getArcs() == 1 && !target.hasValue() && !target.isWildcard()) {
merge(target.getFirstArc());
}
}
/**
* Merge neighbour nodes if they are degenerated trees.
*/
public void pack() {
if (target.getArcs() == 1 && !target.hasValue() && !target.isWildcard()) {
merge(target.getFirstArc());
}
target.pack();
}
/**
* Number of characters to be consumed if this arc matches the input.
**/
public int length() {
return code.length;
}
/**
* Returns length() if this arc matches the input, 0 otherwise.
*/
public int match(CharSequence seq, int i) {
if (i+code.length > seq.length()) return 0;
for (int j=0; j " + target.getPattern().getRegex();
}
else {
return "ARC(" + new String(code) + ") --> 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.
*
* @param original the array to be copied
* @param newLength the length of the copy to be returned
* @return a copy of the original array, truncated or padded with null characters
* to obtain the specified length
* @throws NegativeArraySizeException if newLength is negative
* @throws NullPointerException if original is null
* @since 1.6
*/
private static char[] copyOf(char[] original, int newLength) {
char[] copy = new char[newLength];
System.arraycopy(original, 0, copy, 0,
Math.min(original.length, newLength));
return copy;
}
}
