package com.avaje.ebeaninternal.server.el;

import java.util.ArrayList;
import java.util.List;

/**
 * Utility object used to build a ElPropertyChain.
 * <p>
 * Builds a ElPropertyChain based on a chain of properties with dot separators.
 * </p>
 * <p>
 * This can navigate an object graph based on dot notation such as
 * order.customer.name.
 * </p>
 */
public class ElPropertyChainBuilder {

	private final String expression;

	private final List<ElPropertyValue> chain = new ArrayList<ElPropertyValue>();

	private final boolean embedded;
	
	private boolean containsMany;
	
	/**
	 * Create with the original expression.
	 */
	public ElPropertyChainBuilder(boolean embedded, String expression) {
		this.embedded = embedded;
		this.expression = expression;
	}
	
	public boolean isContainsMany() {
		return containsMany;
	}

	public void setContainsMany(boolean containsMany) {
		this.containsMany = containsMany;
	}

	public String getExpression() {
		return expression;
	}

	/**
	 * Add a ElGetValue element to the chain.
	 */
	public ElPropertyChainBuilder add(ElPropertyValue element) {
	    if (element == null){
	        throw new NullPointerException("element null in expression "+expression);
	    }
		chain.add(element);
		return this;
	}

	/**
	 * Build the immutable ElGetChain from the build information.
	 */
	public ElPropertyChain build() {
		return new ElPropertyChain(containsMany, embedded, expression, chain.toArray(new ElPropertyValue[chain.size()]));
	}

}