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package org.lumongo.storage.lucene;

/**
 * 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.
 */

import java.io.IOException;

import org.apache.lucene.store.IndexInput;

public class DistributedIndexInput extends IndexInput {
	private final NosqlFile nosqlFile;
	
	protected long position;
	
	public DistributedIndexInput(NosqlFile nosqlFile) {
		super(DistributedIndexInput.class.getSimpleName() + "(" + nosqlFile.getFileName() + ")");
		this.nosqlFile = nosqlFile;
	}
	
	@Override
	public void close() throws IOException {
		
	}
	
	@Override
	public long getFilePointer() {
		return position;
	}
	
	@Override
	public void seek(long pos) throws IOException {
		this.position = pos;
		
	}
	
	@Override
	public long length() {
		return nosqlFile.getFileLength();
	}
	
	@Override
	public byte readByte() throws IOException {
		return nosqlFile.readByte(position++);
		
	}
	
	@Override
	public void readBytes(byte[] b, int offset, int length) throws IOException {
		nosqlFile.readBytes(position, b, offset, length);
		position += length;
	}
	
	@Override
	public IndexInput slice(String sliceDescription, final long sliceOffset, final long length) throws IOException {
		
		final DistributedIndexInput dii = new DistributedIndexInput(nosqlFile) {
			
			@Override
			public long length() {
				return length;
			}
			
			@Override
			public byte readByte() throws IOException {
				return nosqlFile.readByte(position++ + sliceOffset);
			}
			
			@Override
			public void readBytes(byte[] b, int offset, int length) throws IOException {
				nosqlFile.readBytes(position + sliceOffset, b, offset, length);
				position += length;
			}
		};
		
		return dii;
	}
}