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Improve performance matchingNibbleLength

This commit is contained in:
nicksavers 2014-08-03 21:32:33 +02:00
parent a5802b9398
commit 5db586b911
1 changed files with 6 additions and 3 deletions
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9
ethereumj-core/src/main/java/org/ethereum/trie/Trie.java
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@ -400,14 +400,18 @@ public class Trie implements TrieFacade {
*******************************/ *******************************/
// Returns the amount of nibbles that match each other from 0 ... // Returns the amount of nibbles that match each other from 0 ...
private int matchingNibbleLength(byte[] a, byte[] b) { public static int matchingNibbleLength(byte[] a, byte[] b) {
int i = 0; int i = 0;
while (Arrays.equals(copyOfRange(a, 0, i+1), copyOfRange(b, 0, i+1)) && i < b.length) { int length = a.length < b.length ? a.length : b.length;
while (i < length) {
if (a[i] != b[i])
break;
i++; i++;
} }
return i; return i;
} }
// Created an array of empty elements of requred length // Created an array of empty elements of requred length
private Object[] emptyStringSlice(int l) { private Object[] emptyStringSlice(int l) {
Object[] slice = new Object[l]; Object[] slice = new Object[l];
@ -418,7 +422,6 @@ public class Trie implements TrieFacade {
} }
public byte[] getRootHash() { public byte[] getRootHash() {
Object root = this.getRoot();
if (root == null if (root == null
|| (root instanceof byte[] && ((byte[]) root).length == 0) || (root instanceof byte[] && ((byte[]) root).length == 0)
|| (root instanceof String && "".equals((String) root))) { || (root instanceof String && "".equals((String) root))) {