com.arangodb.velocypack.VPackStringSlice Maven / Gradle / Ivy
package com.arangodb.velocypack;
import java.nio.charset.StandardCharsets;
/**
* Wrapper around a {@link ValueType#STRING} supporting fast bytewise comparison.
*
* @see VelocyPack Objects
*/
public class VPackStringSlice implements Comparable {
private final byte[] vpack;
/**
* Index of the string bytes within {@link this#vpack},
* i.e. tag byte and length are somewhere before this index.
*/
private final int start;
private final int length;
public VPackStringSlice(byte[] vpack, int start, int length) {
this.vpack = vpack;
this.start = start;
this.length = length;
}
@Override
public int compareTo(VPackStringSlice o) {
return compareToBytes(o.vpack, o.start, o.length);
}
public int compareToBytes(byte[] other) {
return compareToBytes(other, 0, other.length);
}
public int compareToBytes(byte[] other, int off, int oLen) {
for (int i = 0; i < length && i < oLen; i++) {
int c = (vpack[start + i] & 0xff) - (other[off + i] & 0xff);
if (c != 0) return c;
}
return length - oLen;
}
@Override
public String toString() {
return new String(vpack, start, length, StandardCharsets.UTF_8);
}
}