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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.curator.transaction;
import com.yahoo.path.Path;
import com.yahoo.vespa.curator.Curator;
import org.apache.curator.framework.api.transaction.CuratorTransaction;
/**
* @author Ulf Lilleengen
* @author bratseth
*/
class CuratorDeleteOperation implements CuratorOperation {
private final String path;
CuratorDeleteOperation(String path) {
this.path = path;
}
@Override
public void check(Curator curator, TransactionChanges changes) {
if ( ! curator.exists(Path.fromString(path)) && ! changes.create(path))
throw new IllegalStateException("Cannot perform " + this + ": Path does not exist");
if (hasNondeletedChildren(Path.fromString(path), curator, changes) || changes.createsChildrenOf(path))
throw new IllegalStateException("Cannot perform " + this + ": Path is not empty");
changes.addDelete(path);
}
private boolean hasNondeletedChildren(Path path, Curator curator, TransactionChanges changes) {
for (String childName : curator.getChildren(path))
if ( ! changes.delete(path.append(childName).getAbsolute()))
return true;
return false;
}
@Override
public CuratorTransaction and(CuratorTransaction transaction) throws Exception {
return transaction.delete().forPath(path).and();
}
@Override
public String toString() {
return "DELETE " + path;
}
}
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