/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.oak.kernel;
import java.io.InputStream;
import javax.annotation.Nonnull;
import org.apache.jackrabbit.mk.api.MicroKernel;
import org.apache.jackrabbit.mk.util.MicroKernelInputStream;
import org.apache.jackrabbit.oak.plugins.memory.AbstractBlob;
/**
* This {@code Blob} implementation is backed by a binary stored in
* a {@code MicroKernel}.
*/
public class KernelBlob extends AbstractBlob {
private final String binaryID;
private final MicroKernel kernel;
/**
* The id returned from {@link MicroKernel#write(java.io.InputStream)}
* @return the binary id of this blob
*/
public String getBinaryID() {
return binaryID;
}
/**
* Create a new instance for a binary id and a Microkernel.
* @param binaryID id of the binary
* @param kernel
*/
public KernelBlob(String binaryID, MicroKernel kernel) {
this.binaryID = binaryID;
this.kernel = kernel;
}
@Nonnull
@Override
public InputStream getNewStream() {
return new MicroKernelInputStream(kernel, binaryID);
}
/**
* This implementation delegates the calculation of the length back
* to the underlying {@code MicroKernel}.
*/
@Override
public long length() {
return kernel.getLength(binaryID);
}
@Override
public String getReference() {
return binaryID;
}
/**
* This implementation delegates back to the underlying {@code Microkernel}
* if other is also of type {@code KernelBlob}.
*/
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (other instanceof KernelBlob) {
KernelBlob that = (KernelBlob) other;
return binaryID.equals(that.binaryID);
}
return super.equals(other);
}
}