/*

 * Copyright (c) 1998, 2013, 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 build.tools.jdwpgen;

import java.util.*;

import java.io.*;

class SelectNode extends AbstractGroupNode implements TypeNode {

    AbstractSimpleTypeNode typeNode = null;

    void prune() {

        super.prune();

        Iterator<Node> it = components.iterator();

        if (it.hasNext()) {

            Node typeNode = it.next();

            if (typeNode instanceof ByteTypeNode ||

                      typeNode instanceof IntTypeNode) {

                this.typeNode = (AbstractSimpleTypeNode)typeNode;

                it.remove();

            } else {

                error("Select must be based on 'int' or 'byte'");

            }

        } else {

            error("empty");

        }

    }

    void constrain(Context ctx) {

        super.constrain(ctx);

        if (components.size() < 2) {

            error("Select must have at least two options");

        }

    }

    void constrainComponent(Context ctx, Node node) {

        node.constrain(ctx);

        if (!(node instanceof AltNode)) {

            error("Select must consist of selector followed by Alt items");

        }

    }

    void document(PrintWriter writer) {

        typeNode.document(writer);

        super.document(writer);

    }

    String docType() {

        // should never call this

        error("Internal - called SelectNode.docType()");

        return null;

    }

    String commonBaseClass() {

        return name() + "Common";

    }

    private String commonVar() {

        return " a" + commonBaseClass();

    }

    void genJavaClassSpecifics(PrintWriter writer, int depth) {

        indent(writer, depth);

        writer.println("abstract static class " + commonBaseClass() + " {");

        if (context.isWritingCommand()) {

            indent(writer, depth+1);

            writer.println("abstract void write(PacketStream ps);");

        } else {

            indent(writer, depth+1);

            writer.println("abstract " + typeNode.javaParam() + "();");

        }

        indent(writer, depth);

        writer.println("}");

        typeNode.genJavaDeclaration(writer, depth);

        indent(writer, depth);

        writer.println(commonBaseClass() + commonVar() + ";");

        super.genJavaClassSpecifics(writer, depth);

    }

    void genJavaClassBodyComponents(PrintWriter writer, int depth) {

        // don't naively include alt components

    }

    void genJavaWritingClassBody(PrintWriter writer, int depth,

                                 String className) {

        writer.println();

        indent(writer, depth);

        writer.print(className + "(" + typeNode.javaParam() + ", ");

        writer.print(commonBaseClass() + commonVar());

        writer.println(") {");

        indent(writer, depth+1);

        writer.println("this." + typeNode.name() + " = " + typeNode.name() + ";");

        indent(writer, depth+1);

        writer.println("this." + commonVar() + " =" + commonVar() + ";");

        indent(writer, depth);

        writer.println("}");

    }

    void genJavaWrites(PrintWriter writer, int depth) {

        typeNode.genJavaWrite(writer, depth, typeNode.name());

        indent(writer, depth);

        writer.println(commonVar() + ".write(ps);");

    }

    void genJavaReads(PrintWriter writer, int depth) {

        typeNode.genJavaRead(writer, depth, typeNode.name());

        indent(writer, depth);

        writer.println("switch (" + typeNode.name() + ") {");

        for (Node node : components) {

            AltNode alt = (AltNode)node;

            alt.genJavaReadsSelectCase(writer, depth+1, commonVar());

        }

        indent(writer, depth);

        writer.println("}");

    }

    public void genJavaDeclaration(PrintWriter writer, int depth) {

        typeNode.genJavaDeclaration(writer, depth);

        super.genJavaDeclaration(writer, depth);

    }

    public String javaParam() {

        return typeNode.javaParam() + ", " + name() + " a" + name();

    }

}