/*
 * Copyright (c) 2010-2012 Grid Dynamics Consulting Services, Inc, All Rights Reserved
 * http://www.griddynamics.com
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of
 * the Apache License; either
 * version 2.0 of the License, or any later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.griddynamics.jagger.storage;

import java.util.List;

import com.google.common.base.Joiner;
import com.google.common.collect.Lists;
import com.google.common.collect.ImmutableList;

/**
 * Presents tree-structured namespace.
 * 
 * @author Mairbek Khadikov
 * 
 */
public class Namespace {
	private static final String SEPARATOR = "/";
	private final List<String> values;

	public static Namespace root() {
		return of(Lists.<String> newArrayList());
	}

	public static Namespace of(List<String> values) {
		return new Namespace(values);
	}

	public static Namespace of(String... values) {
		return of(Lists.newArrayList(values));
	}

	private Namespace(List<String> values) {
		this.values = values;
	}

	public List<String> getValues() {
		return values;
	}
	
	public Namespace child(List<String> values) {
		ImmutableList<String> child = ImmutableList.<String>builder().addAll(this.values).addAll(values).build();
		return Namespace.of(child);
	}
	
	public Namespace child(String... values) {
		return child(Lists.newArrayList(values));
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((values == null) ? 0 : values.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Namespace other = (Namespace) obj;
		if (values == null) {
			if (other.values != null)
				return false;
		} else if (!values.equals(other.values))
			return false;
		return true;
	}

	@Override
	public String toString() {
		if (values.isEmpty()) {
			return SEPARATOR;
		}
		return Joiner.on(SEPARATOR).join(values);
	}

}