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package com.jsoniter;

public class Slice {

private byte[] data;

private int head;

private int tail;

private int hash;

public Slice(byte[] data, int head, int tail) {

this.data = data;

this.head = head;

this.tail = tail;

}

public void reset(byte[] data, int head, int tail) {

this.data = data;

this.head = head;

this.tail = tail;

this.hash = 0;

}

public final byte at(int pos) {

return data[head + pos];

}

public final int len() {

return tail - head;

}

public final byte[] data() {

return data;

}

public final int head() {

return head;

}

public final int tail() {

return tail;

}

public static Slice make(String str) {

byte[] data = str.getBytes();

return new Slice(data, 0, data.length);

}

@Override

public final boolean equals(Object o) {

Slice slice = (Slice) o;

if ((tail - head) != (slice.tail - slice.head)) return false;

for (int i = head, j = slice.head; i < tail; i++, j++)

if (data[i] != slice.data[j])

return false;

return true;

}

@Override

public final int hashCode() {

if (hash == 0 && tail - head > 0) {

for (int i = head; i < tail; i++) {

hash = 31 * hash + data[i];

}

}

return hash;

}

@Override

public String toString() {

return new String(data, head, tail - head);

}

}