SwhPath.java
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	package org.softwareheritage.graph;

	import com.fasterxml.jackson.annotation.JsonValue;

	import java.util.ArrayList;

	/**
	* Wrapper class to store a list of {@link SWHID}.
	*
	* @author The Software Heritage developers
	* @see SWHID
	*/

	public class SwhPath {
	/** Internal list of {@link SWHID} */
	ArrayList<SWHID> path;

	/**
	* Constructor.
	*/
	public SwhPath() {
	this.path = new ArrayList<>();
	}

	/**
	* Constructor.
	*
	* @param swhids variable number of string SWHIDs to initialize this path with
	*/
	public SwhPath(String... swhids) {
	this();
	for (String swhid : swhids) {
	add(new SWHID(swhid));
	}
	}

	/**
	* Constructor.
	*
	* @param swhids variable number of {@link SWHID} to initialize this path with
	* @see SWHID
	*/
	public SwhPath(SWHID... swhids) {
	this();
	for (SWHID swhid : swhids) {
	add(swhid);
	}
	}

	/**
	* Returns this path as a list of {@link SWHID}.
	*
	* @return list of {@link SWHID} constituting the path
	* @see SWHID
	*/
	@JsonValue
	public ArrayList<SWHID> getPath() {
	return path;
	}

	/**
	* Adds a {@link SWHID} to this path.
	*
	* @param swhid {@link SWHID} to add to this path
	* @see SWHID
	*/
	public void add(SWHID swhid) {
	path.add(swhid);
	}

	/**
	* Returns the {@link SWHID} at the specified position in this path.
	*
	* @param index position of the {@link SWHID} to return
	* @return {@link SWHID} at the specified position
	* @see SWHID
	*/
	public SWHID get(int index) {
	return path.get(index);
	}

	/**
	* Returns the number of elements in this path.
	*
	* @return number of elements in this path
	*/
	public int size() {
	return path.size();
	}

	@Override
	public boolean equals(Object otherObj) {
	if (otherObj == this)
	return true;
	if (!(otherObj instanceof SwhPath))
	return false;

	SwhPath other = (SwhPath) otherObj;
	if (size() != other.size()) {
	return false;
	}

	for (int i = 0; i < size(); i++) {
	SWHID thisSWHID = get(i);
	SWHID otherSWHID = other.get(i);
	if (!thisSWHID.equals(otherSWHID)) {
	return false;
	}
	}

	return true;
	}

	@Override
	public String toString() {
	StringBuilder str = new StringBuilder();
	for (SWHID swhid : path) {
	str.append(swhid).append("/");
	}
	return str.toString();
	}
	}

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