com.sun.tools.xjc.reader.gbind.ConnectedComponent Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.tools.xjc.reader.gbind;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Represents one strongly-connected component
* of the {@link Element} graph.
*
* @author Kohsuke Kawaguchi
*/
public final class ConnectedComponent implements Iterable {
/**
* {@link Element}s that belong to this component.
*/
private final List elements = new ArrayList();
/*package*/ boolean isRequired;
/**
* Returns true iff this {@link ConnectedComponent}
* can match a substring whose length is greater than 1.
*
*
* That means this property will become a collection property.
*/
public final boolean isCollection() {
assert !elements.isEmpty();
// a strongly connected component by definition has a cycle,
// so if its size is bigger than 1 there must be a cycle.
if(elements.size()>1)
return true;
// if size is 1, it might be still forming a self-cycle
Element n = elements.get(0);
return n.hasSelfLoop();
}
/**
* Returns true iff this {@link ConnectedComponent}
* forms a cut set of a graph.
*
*
* That means any valid element sequence must have at least
* one value for this property.
*/
public final boolean isRequired() {
return isRequired;
}
/*package*/void add(Element e) {
assert !elements.contains(e);
elements.add(e);
}
public Iterator iterator() {
return elements.iterator();
}
/**
* Just produces debug representation
*/
public String toString() {
String s = elements.toString();
if(isRequired())
s += '!';
if(isCollection())
s += '*';
return s;
}
}