/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.internal.xjc.reader.xmlschema;

import java.util.Collection;

import com.sun.tools.internal.xjc.model.CPropertyInfo;
import com.sun.tools.internal.xjc.model.Multiplicity;
import com.sun.tools.internal.xjc.reader.RawTypeSet;
import com.sun.tools.internal.xjc.reader.gbind.ConnectedComponent;
import com.sun.tools.internal.xjc.reader.gbind.Element;
import com.sun.tools.internal.xjc.reader.gbind.Expression;
import com.sun.tools.internal.xjc.reader.gbind.Graph;
import com.sun.tools.internal.xjc.reader.xmlschema.bindinfo.BIProperty;
import com.sun.xml.internal.bind.v2.model.core.WildcardMode;
import com.sun.xml.internal.xsom.XSParticle;

/**
 * {@link ParticleBinder} that uses {@link ExpressionBuilder} et al
 * for better, more intuitive (but non spec-conforming) binding.
 *
 * @author Kohsuke Kawaguchi
 */
final class ExpressionParticleBinder extends ParticleBinder {
    public void build(XSParticle p, Collection<XSParticle> forcedProps) {
        // this class isn't about spec conformance, but
        // for the ease of use.
        // so we don't give a damn about 'forcedProps'.
        // although, for a future note, it's conceivable to expand
        // the binding algorithm to cover this notion.

        Expression tree = ExpressionBuilder.createTree(p);
        Graph g = new Graph(tree);
        for (ConnectedComponent cc : g) {
            buildProperty(cc);
        }
    }

    /**
     * Builds a property ouf ot a connected component.
     */
    private void buildProperty(ConnectedComponent cc) {
        StringBuilder propName = new StringBuilder(); // property name
        int nameTokenCount = 0; // combine only up to 3

        RawTypeSetBuilder rtsb = new RawTypeSetBuilder();
        for (Element e : cc) {
            GElement ge = (GElement)e;

            if(nameTokenCount<3) {
                if(nameTokenCount!=0)
                    propName.append("And");
                propName.append(makeJavaName(cc.isCollection(),ge.getPropertyNameSeed()));
                nameTokenCount++;
            }

            if(e instanceof GElementImpl) {
                GElementImpl ei = (GElementImpl) e;
                rtsb.elementDecl(ei.decl);
                continue;
            }
            if(e instanceof GWildcardElement) {
                GWildcardElement w = (GWildcardElement)e;
                rtsb.getRefs().add(new RawTypeSetBuilder.WildcardRef(
                    w.isStrict() ? WildcardMode.STRICT : WildcardMode.SKIP));
                continue;
            }
            assert false : e;   // no other kind should be here
        }

        Multiplicity m = Multiplicity.ONE;
        if(cc.isCollection())
            m = m.makeRepeated();
        if(!cc.isRequired())
            m = m.makeOptional();

        RawTypeSet rts = new RawTypeSet(rtsb.getRefs(),m);

        XSParticle p = findSourceParticle(cc);

        BIProperty cust = BIProperty.getCustomization(p);
        CPropertyInfo prop = cust.createElementOrReferenceProperty(
            propName.toString(), false, p, rts );
        getCurrentBean().addProperty(prop);
    }

    /**
     * Finds a {@link XSParticle} that can serve as the representative property of
     * the given {@link ConnectedComponent}.
     *
     * The representative property is used for reporting an error location and
     * taking {@link BIProperty} customization. Right now, the algorithm is just pick
     * the first one with {@link BIProperty}, but one can think of a better algorithm,
     * such as taking a choice of (A|B) if CC={A,B}.
     */
    private XSParticle findSourceParticle(ConnectedComponent cc) {
        XSParticle first = null;

        for (Element e : cc) {
            GElement ge = (GElement)e;
            for (XSParticle p : ge.particles) {
                if(first==null)
                    first = p;
                if(getLocalPropCustomization(p)!=null)
                    return p;
            }
            // if there are multiple property customizations,
            // all but one will be left unused, which will be detected as an error
            // later, so no need to check that now.
        }

        // if no customization was found, just use the first one.
        return first;
    }

    public boolean checkFallback(XSParticle p) {
        // this algorithm never falls back to 'getContent'.
        return false;
    }
}