/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package com.sun.xml.internal.xsom.impl;

import com.sun.xml.internal.xsom.XSDeclaration;

import java.util.Comparator;

/**

 * UName.

 *

 * @author Kohsuke Kawaguchi (kk@kohsuke.org)

 */

public final class UName {

    /**

     * @param _nsUri

     *      Use "" to indicate the no namespace.

     */

    public UName( String _nsUri, String _localName, String _qname ) {

        if(_nsUri==null || _localName==null || _qname==null) {

            throw new NullPointerException(_nsUri+" "+_localName+" "+_qname);

        }

        this.nsUri = _nsUri.intern();

        this.localName = _localName.intern();

        this.qname = _qname.intern();

    }

    public UName( String nsUri, String localName ) {

        this(nsUri,localName,localName);

    }

    public UName(XSDeclaration decl) {

        this(decl.getTargetNamespace(),decl.getName());

    }

    private final String nsUri;

    private final String localName;

    private final String qname;

    public String getName() { return localName; }

    public String getNamespaceURI() { return nsUri; }

    public String getQualifiedName() { return qname; }

    // Issue 540; XSComplexType.getAttributeUse(String,String) always return null

    // UName was used in HashMap without overriden equals and hashCode methods.

    @Override

    public boolean equals(Object obj) {

        if(obj instanceof UName) {

            UName u = (UName)obj;

            return ((this.getName().compareTo(u.getName()) == 0) &&

                    (this.getNamespaceURI().compareTo(u.getNamespaceURI()) == 0) &&

                    (this.getQualifiedName().compareTo(u.getQualifiedName()) == 0));

        } else {

            return false;

        }

    }

    @Override

    public int hashCode() {

        int hash = 7;

        hash = 13 * hash + (this.nsUri != null ? this.nsUri.hashCode() : 0);

        hash = 13 * hash + (this.localName != null ? this.localName.hashCode() : 0);

        hash = 13 * hash + (this.qname != null ? this.qname.hashCode() : 0);

        return hash;

    }

    /**

     * Compares {@link UName}s by their names.

     */

    public static final Comparator comparator = new Comparator() {

        public int compare(Object o1, Object o2) {

            UName lhs = (UName)o1;

            UName rhs = (UName)o2;

            int r = lhs.nsUri.compareTo(rhs.nsUri);

            if(r!=0)    return r;

            return lhs.localName.compareTo(rhs.localName);

        }

    };

}