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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.query;
import java.util.Objects;
/**
* An substring which also provides access to the full (query) string it is a substring of.
* This is a value object.
*
* @author bratseth
*/
public class Substring {
/** The start of the substring */
public final int start;
/** The end of the substring */
public final int end;
/** The string this is a substring of */
public final String string;
/** Creates a substring which is identical to the string containing it */
public Substring(String string) {
this.start = 0;
this.end = string.length();
this.string=string;
}
public Substring(int start, int end, String string) {
this.start = start;
this.end = end;
this.string=string;
}
public String getValue() {
return string.substring(start, end);
}
/** Returns the entire string this is a substring of. The start and end offsets are into this string. */
public String getSuperstring() { return string; }
/**
* Returns the character n places (0 base) after the end of the value substring into the superstring.
* For example charAfter(0) returns the first character after the end of the substring
*
* @return the char n planes after the end of the substring
* @throws IndexOutOfBoundsException if the string is not long enough to have a character at this position
*/
public char charAfter(int n) {
return string.charAt(end+n);
}
/**
* Returns the character n places (0 base) before the start of the value substring into the superstring.
* For example charBefore(0) returns the first character before the start of the substring
*
* @return the char n planes before the start of the substring
* @throws IndexOutOfBoundsException if the string does not have a character at this position
*/
public char charBefore(int n) {
return string.charAt(start-1-n);
}
@Override
public String toString() {
return "(" + start + ' ' + end + ')';
}
@Override
public boolean equals(Object o) {
if ( ! (o instanceof Substring)) return false;
var other = (Substring)o;
if (this.start != other.start) return false;
if (this.end != other.end) return false;
if (! Objects.equals(this.string, other.string)) return false;
return true;
}
@Override
public int hashCode() {
return Objects.hash(start, end, string);
}
}
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