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package com.github.dockerjava.api.model;

import com.google.common.base.MoreObjects;
import com.google.common.base.Optional;

import java.io.Serializable;

/**
 * @author magnayn
 */
public class Identifier implements Serializable {
    private static final long serialVersionUID = 1L;

    public final Repository repository;

    public final Optional tag;

    public Identifier(Repository repository, String tag) {
        this.repository = repository;

        if (tag == null) {
            this.tag = Optional.absent();
        } else {
            this.tag = Optional.of(tag);
        }
    }

    /**
     * Return an identifier that correctly splits up the repository and tag. There can be > 1 ":" fred/jim --> fred/jim, []
     * fred/jim:123 --> fred/jim, 123 fred:123/jim:123 --> fred:123/jim, 123
     *
     *
     * @param identifier
     *            as a string
     * @return parsed identifier.
     */
    public static Identifier fromCompoundString(String identifier) {
        String[] parts = identifier.split("/");
        if (parts.length != 2) {
            String[] rhs = identifier.split(":");
            if (rhs.length != 2) {
                return new Identifier(new Repository(identifier), null);
            } else {
                return new Identifier(new Repository(rhs[0]), rhs[1]);
            }
        }

        String[] rhs = parts[1].split(":");
        if (rhs.length != 2) {
            return new Identifier(new Repository(identifier), null);
        }

        return new Identifier(new Repository(parts[0] + "/" + rhs[0]), rhs[1]);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(this).add("repository", repository).add("tag", tag).toString();
    }
}