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/*
 * Copyright 2013 EMC Corporation. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 * http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 * or in the "license" file accompanying this file. This file 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 com.emc.esu.api;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

/**
 * @author cwikj
 *
 */
public class MultiExtent extends Extent implements List {
	private List extents;
	
	public MultiExtent() {
		super(0,0);
		extents = new ArrayList();
	}
	
	@Override
	public long getOffset() {
		if(extents.isEmpty()) {
			return -1;
		}
		long start = Long.MAX_VALUE;
		for(Extent e : extents) {
			if(e.getOffset() < start) {
				start = e.getOffset();
			}
		}
		
		return start;
	}
	
	@Override
	public long getSize() {
		long size = 0;
		for(Extent e : extents) {
			size += e.getSize();
		}
		
		return size;
	}
	
	@Override
	public String toString() {
		if(extents.isEmpty()) {
			throw new IllegalArgumentException("Must have at least one extent");
		}
		
		StringBuilder sb = new StringBuilder();
		sb.append("bytes=");
		boolean first = true;
		for(Extent e : extents) {
			if(!first) {
				sb.append(",");
			} else {
				first = false;
			}
			
	        long end = e.getOffset() + (e.getSize()-1);
	        sb.append(e.getOffset() + "-" + end);
		}
		
		return sb.toString();
	}

	@Override
	public boolean add(Extent e) {
		return extents.add(e);
	}

	@Override
	public void add(int i, Extent e) {
		extents.add(i, e);
	}

	@Override
	public boolean addAll(Collection c) {
		return extents.addAll(c);
	}

	@Override
	public boolean addAll(int i, Collection c) {
		return extents.addAll(i, c);
	}

	@Override
	public void clear() {
		extents.clear();
	}

	@Override
	public boolean contains(Object e) {
		return extents.contains(e);
	}

	@Override
	public boolean containsAll(Collection c) {
		return extents.containsAll(c);
	}

	@Override
	public Extent get(int i) {
		return extents.get(i);
	}

	@Override
	public int indexOf(Object e) {
		return extents.indexOf(e);
	}

	@Override
	public boolean isEmpty() {
		return extents.isEmpty();
	}

	@Override
	public Iterator iterator() {
		return extents.iterator();
	}

	@Override
	public int lastIndexOf(Object e) {
		return extents.lastIndexOf(e);
	}

	@Override
	public ListIterator listIterator() {
		return extents.listIterator();
	}

	@Override
	public ListIterator listIterator(int i) {
		return extents.listIterator(i);
	}

	@Override
	public boolean remove(Object e) {
		return extents.remove(e);
	}

	@Override
	public Extent remove(int i) {
		return extents.remove(i);
	}

	@Override
	public boolean removeAll(Collection c) {
		return extents.removeAll(c);
	}

	@Override
	public boolean retainAll(Collection c) {
		return extents.retainAll(c);
	}

	@Override
	public Extent set(int i, Extent e) {
		return extents.set(i, e);
	}

	@Override
	public int size() {
		return extents.size();
	}

	@Override
	public List subList(int i, int j) {
		return extents.subList(i, j);
	}

	@Override
	public Object[] toArray() {
		return extents.toArray();
	}

	@Override
	public  T[] toArray(T[] a) {
		return extents.toArray(a);
	}
	
	

}