in src/main/java/org/apache/sling/resourcemerger/impl/picker/SearchPathBasedResourcePicker.java [170:178]
public String getResourcePath(final String searchPath, final String mergedResourcePath) {
if( searchPath == null || !searchPath.startsWith("/") || !searchPath.endsWith("/") ) {
throw new IllegalArgumentException("Provided path is not a valid search path: " + searchPath);
}
if ( mergedResourcePath == null || !mergedResourcePath.startsWith(this.mergeRootPath + "/") ) {
throw new IllegalArgumentException("Provided path does not point to a merged resource: " + mergedResourcePath);
}
return searchPath + mergedResourcePath.substring(this.mergeRootPath.length() + 1);
}