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Json-LD core implementation

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package com.github.jsonldjava.core;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class UniqueNamer {
	private String prefix;
	private int counter;
	private Map existing;

	/**
	 * Creates a new UniqueNamer. A UniqueNamer issues unique names, keeping
	 * track of any previously issued names.
	 *
	 * @param prefix the prefix to use ('').
	 */
	public UniqueNamer(String prefix) {
		this.prefix = prefix;
		this.counter = 0;
		this.existing = new LinkedHashMap();
	}
	
	/**
	 * Copies this UniqueNamer.
	 *
	 * @return a copy of this UniqueNamer.
	 */
	public UniqueNamer clone() {
		UniqueNamer copy = new UniqueNamer(this.prefix);
		copy.counter = this.counter;
		copy.existing = (Map) JSONLDUtils.clone(this.existing);
		return copy;
	}
	
	/**
	 * Gets the new name for the given old name, where if no old name is given
	 * a new name will be generated.
	 *
	 * @param [oldName] the old name to get the new name for.
	 *
	 * @return the new name.
	 */
	public String getName(String oldName) {
		if (oldName != null && this.existing.containsKey(oldName)) {
			return this.existing.get(oldName);
		}
		
		String name = this.prefix + this.counter;
		this.counter++;
		
		if (oldName != null) {
			this.existing.put(oldName, name);
		}
		
		return name;
	}
	
	public String getName() {
		return getName(null);
	}
	
	public Boolean isNamed(String oldName) {
		return this.existing.containsKey(oldName);
	}

	public Map existing() {
		return existing;
	}
}