com.sun.tools.rngom.binary.visitor.ChildElementFinder Maven / Gradle / Ivy
/*
* Copyright (C) 2004-2011
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.sun.tools.rngom.binary.visitor;
import com.sun.tools.rngom.binary.Pattern;
import com.sun.tools.rngom.nc.NameClass;
import java.util.HashSet;
import java.util.Set;
/**
* Visits a pattern and creates a list of possible child elements.
*
*
* One can use a similar technique to introspect a pattern.
*
* @author Kohsuke Kawaguchi ([email protected])
*/
public class ChildElementFinder extends PatternWalker {
private final Set children = new HashSet();
/**
* Represents a child element.
*/
public static class Element {
public final NameClass nc;
public final Pattern content;
public Element(NameClass nc, Pattern content) {
this.nc = nc;
this.content = content;
}
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Element)) return false;
final Element element = (Element) o;
if (content != null ? !content.equals(element.content) : element.content != null) return false;
if (nc != null ? !nc.equals(element.nc) : element.nc != null) return false;
return true;
}
public int hashCode() {
int result;
result = (nc != null ? nc.hashCode() : 0);
result = 29 * result + (content != null ? content.hashCode() : 0);
return result;
}
}
/**
* Returns a set of {@link Element}.
*/
public Set getChildren() {
return children;
}
public void visitElement(NameClass nc, Pattern content) {
children.add(new Element(nc,content));
}
public void visitAttribute(NameClass ns, Pattern value) {
// there will be no element inside attribute,
// so don't go in there.
}
public void visitList(Pattern p) {
// there will be no element inside a list,
// so don't go in there.
}
}