Package com.vaadin.flow.internal

Class ResourceContentHash

java.lang.Object

com.vaadin.flow.internal.ResourceContentHash

public class ResourceContentHash
extends Object

Computes and caches content-based hashes for static resources, enabling cache-busting by appending a version query parameter to resource URLs. The hash changes only when file content changes, allowing aggressive browser caching.

For internal use only. May be renamed or removed in a future release.

Author:

Vaadin Ltd

Method Summary

Modifier and Type	Method	Description
static String	getContentHash(VaadinService service, String resourceUrl)	Computes a truncated SHA-256 content hash for the given resource URL.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

getContentHash

public static String getContentHash(VaadinService service,
 String resourceUrl)

Computes a truncated SHA-256 content hash for the given resource URL. Returns null for external URLs (http/https), missing resources, or on any I/O error. Results are cached so that each resource is read at most once.

Parameters:

service - the Vaadin service used to load the resource

resourceUrl - the resource path to hash

Returns:

an 8-character hex hash string, or null if the hash cannot be computed