de.schlichtherle.truezip.zip.ZipParametersUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2005-2015 Schlichtherle IT Services.
* All rights reserved. Use is subject to license terms.
*/
package de.schlichtherle.truezip.zip;
import javax.annotation.CheckForNull;
import javax.annotation.concurrent.ThreadSafe;
/**
* Provides static utility methods for ZIP parameters.
*
* @author Christian Schlichtherle
*/
@ThreadSafe
final class ZipParametersUtils {
private ZipParametersUtils() {
}
/**
* Searches for {@code ZipParameters} of the given type starting from
* the given parameters.
*
* @param the type of the ZIP parameters to search for.
* @param type the type of the ZIP parameters to search for.
* @param param the parameters for starting the search.
* @return The parameters of the given type.
* @throws ZipParametersException if {@code param} is {@code null} or
* no suitable parameters can get found.
*/
static
P parameters(
final Class
type,
@CheckForNull ZipParameters param)
throws ZipParametersException {
while (null != param) {
// Order is important here to support multiple interface implementations!
if (type.isInstance(param)) {
return type.cast(param);
} else if (param instanceof ZipParametersProvider) {
param = ((ZipParametersProvider) param).get(type);
} else {
break;
}
}
throw new ZipParametersException("No suitable ZIP parameters available!");
}
}