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/*
 * This file is part of the DiffX library.
 *
 * For licensing information please see the file license.txt included in the release.
 * A copy of this licence can also be found at
 *   http://www.opensource.org/licenses/artistic-license-2.0.php
 */
package com.topologi.diffx.event.impl;

import java.io.IOException;

import com.topologi.diffx.event.DiffXEvent;
import com.topologi.diffx.xml.XMLWriter;

/**
 * A branch of XML data.
 *
 * 

A branch of XML data must start and end with the same element. * *

Implementation note: this class wraps an array of DiffX events and does not give * access to this array, so it can be considered immutable. * * @author Christophe Lauret * @version 27 March 2010 */ public final class XMLBranchEvent extends DiffXEventBase implements DiffXEvent { /** * The array of Diff-X events that make up the branch. */ private final DiffXEvent[] branch; /** * Pre-calculated hashcode to speed up equal comparison. */ private final int hashCode; /** * Creates a new XML branch. * * @param events The array of events that make up the branch. */ public XMLBranchEvent(DiffXEvent[] events) { this.branch = events; this.hashCode = toHashCode(events); } @Override public int hashCode() { return this.hashCode; } /** * Returns true if the diffX events in the branch are all equal. * * {@inheritDoc} */ @Override public boolean equals(DiffXEvent e) { if (e.getClass() != this.getClass()) return false; if (e.hashCode() != this.hashCode) return false; XMLBranchEvent be = (XMLBranchEvent)e; // branch must have the same length if (this.branch.length != be.branch.length) return false; // every single event must be equal for (int i = 0; i < this.branch.length; i++) { if (!be.branch[i].equals(this.branch[i])) return false; } // if we arrive here they are equal return true; } /** * Write the DiffX events in order. * * {@inheritDoc} */ @Override public void toXML(XMLWriter xml) throws IOException { for (DiffXEvent element : this.branch) { element.toXML(xml); } } @Override public StringBuffer toXML(StringBuffer xml) throws NullPointerException { for (DiffXEvent element : this.branch) { element.toXML(xml); } return xml; } /** * Calculates the hashcode for this event. * * @param events Events to calculate the value from. * @return a number suitable as a hashcode. */ private static int toHashCode(DiffXEvent[] events) { int hash = 17; for (DiffXEvent e : events) { hash = hash * 13 + (e != null? e.hashCode() : 0); } return hash; } }





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