driver: add Forwarding{Flush|Stage}Request decorator classes

src/main/java/org/dcache/nearline/cta/ForwardingFlushRequest.java

+package org.dcache.nearline.cta;
+
+import com.google.common.util.concurrent.ListenableFuture;
+import java.io.File;
+import java.net.URI;
+import java.util.Set;
+import java.util.UUID;
+import org.dcache.pool.nearline.spi.FlushRequest;
+import org.dcache.vehicles.FileAttributes;
+
+// FIXME: this should be part of dCache
+/**
+ * A FlushRequest that forwards all calls to some other FlushRequest.
+ */
+public abstract class ForwardingFlushRequest implements FlushRequest {
+
+    abstract protected FlushRequest delegate();
+
+    @Override
+    public File getFile() {
+        return delegate().getFile();
+    }
+
+    @Override
+    public URI getReplicaUri() {
+        return delegate().getReplicaUri();
+    }
+
+    @Override
+    public FileAttributes getFileAttributes() {
+        return delegate().getFileAttributes();
+    }
+
+    @Override
+    public long getReplicaCreationTime() {
+        return delegate().getReplicaCreationTime();
+    }
+
+    @Override
+    public ListenableFuture<String> activateWithPath() {
+        return delegate().activateWithPath();
+    }
+
+    @Override
+    public UUID getId() {
+        return delegate().getId();
+    }
+
+    @Override
+    public long getDeadline() {
+        return delegate().getDeadline();
+    }
+
+    @Override
+    public ListenableFuture<Void> activate() {
+        return delegate().activate();
+    }
+
+    @Override
+    public void failed(Exception e) {
+        delegate().failed(e);
+    }
+
+    @Override
+    public void failed(int i, String s) {
+        delegate().failed(i, s);
+    }
+
+    @Override
+    public void completed(Set<URI> uris) {
+        delegate().completed(uris);
+    }
+}

src/main/java/org/dcache/nearline/cta/ForwardingStageRequest.java

+package org.dcache.nearline.cta;
+
+import com.google.common.util.concurrent.ListenableFuture;
+import java.io.File;
+import java.net.URI;
+import java.util.Set;
+import java.util.UUID;
+import org.dcache.pool.nearline.spi.StageRequest;
+import org.dcache.util.Checksum;
+import org.dcache.vehicles.FileAttributes;
+
+// FIXME: this should be part of dCache
+/**
+ * A StageRequest that forwards all calls to some other StageRequest.
+ */
+public abstract class ForwardingStageRequest implements StageRequest {
+
+    abstract protected StageRequest delegate();
+
+
+    @Override
+    public File getFile() {
+        return delegate().getFile();
+    }
+
+    @Override
+    public URI getReplicaUri() {
+        return delegate().getReplicaUri();
+    }
+
+    @Override
+    public FileAttributes getFileAttributes() {
+        return delegate().getFileAttributes();
+    }
+
+    @Override
+    public UUID getId() {
+        return delegate().getId();
+    }
+
+    @Override
+    public long getDeadline() {
+        return delegate().getDeadline();
+    }
+
+    @Override
+    public ListenableFuture<Void> activate() {
+        return delegate().activate();
+    }
+
+    @Override
+    public void failed(Exception e) {
+        delegate().failed(e);
+    }
+
+    @Override
+    public void failed(int i, String s) {
+        delegate().failed(i, s);
+    }
+
+    @Override
+    public ListenableFuture<Void> allocate() {
+        return delegate().allocate();
+    }
+
+    @Override
+    public void completed(Set<Checksum> checksums) {
+        delegate().completed(checksums);
+    }
+}
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