1 /*
   2  * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package build.tools.jdwpgen;
  27 
  28 import java.util.*;
  29 import java.io.*;
  30 
  31 class SelectNode extends AbstractGroupNode implements TypeNode {
  32 
  33     AbstractSimpleTypeNode typeNode = null;
  34 
  35     void prune() {
  36         super.prune();
  37         Iterator<Node> it = components.iterator();
  38 
  39         if (it.hasNext()) {
  40             Node typeNode = it.next();
  41 
  42             if (typeNode instanceof ByteTypeNode ||
  43                       typeNode instanceof IntTypeNode) {
  44                 this.typeNode = (AbstractSimpleTypeNode)typeNode;
  45                 it.remove();
  46             } else {
  47                 error("Select must be based on 'int' or 'byte'");
  48             }
  49         } else {
  50             error("empty");
  51         }
  52     }
  53 
  54     void constrain(Context ctx) {
  55         super.constrain(ctx);
  56         if (components.size() < 2) {
  57             error("Select must have at least two options");
  58         }
  59     }
  60 
  61     void constrainComponent(Context ctx, Node node) {
  62         node.constrain(ctx);
  63         if (!(node instanceof AltNode)) {
  64             error("Select must consist of selector followed by Alt items");
  65         }
  66     }
  67 
  68     void document(PrintWriter writer) {
  69         typeNode.document(writer);
  70         super.document(writer);
  71     }
  72 
  73     String docType() {
  74         // should never call this
  75         error("Internal - called SelectNode.docType()");
  76         return null;
  77     }
  78 
  79     String commonBaseClass() {
  80         return name() + "Common";
  81     }
  82 
  83     private String commonVar() {
  84         return " a" + commonBaseClass();
  85     }
  86 
  87     void genJavaClassSpecifics(PrintWriter writer, int depth) {
  88         indent(writer, depth);
  89         writer.println("abstract static class " + commonBaseClass() + " {");
  90         if (context.isWritingCommand()) {
  91             indent(writer, depth+1);
  92             writer.println("abstract void write(PacketStream ps);");
  93         } else {
  94             indent(writer, depth+1);
  95             writer.println("abstract " + typeNode.javaParam() + "();");
  96         }
  97         indent(writer, depth);
  98         writer.println("}");
  99         typeNode.genJavaDeclaration(writer, depth);
 100         indent(writer, depth);
 101         writer.println(commonBaseClass() + commonVar() + ";");
 102         super.genJavaClassSpecifics(writer, depth);
 103     }
 104 
 105     void genJavaClassBodyComponents(PrintWriter writer, int depth) {
 106         // don't naively include alt components
 107     }
 108 
 109     void genJavaWritingClassBody(PrintWriter writer, int depth,
 110                                  String className) {
 111         writer.println();
 112         indent(writer, depth);
 113         writer.print(className + "(" + typeNode.javaParam() + ", ");
 114         writer.print(commonBaseClass() + commonVar());
 115         writer.println(") {");
 116         indent(writer, depth+1);
 117         writer.println("this." + typeNode.name() + " = " + typeNode.name() + ";");
 118         indent(writer, depth+1);
 119         writer.println("this." + commonVar() + " =" + commonVar() + ";");
 120         indent(writer, depth);
 121         writer.println("}");
 122     }
 123 
 124     void genJavaWrites(PrintWriter writer, int depth) {
 125         typeNode.genJavaWrite(writer, depth, typeNode.name());
 126         indent(writer, depth);
 127         writer.println(commonVar() + ".write(ps);");
 128     }
 129 
 130     void genJavaReads(PrintWriter writer, int depth) {
 131         typeNode.genJavaRead(writer, depth, typeNode.name());
 132         indent(writer, depth);
 133         writer.println("switch (" + typeNode.name() + ") {");
 134         for (Node node : components) {
 135             AltNode alt = (AltNode)node;
 136             alt.genJavaReadsSelectCase(writer, depth+1, commonVar());
 137         }
 138         indent(writer, depth);
 139         writer.println("}");
 140     }
 141 
 142     public void genJavaDeclaration(PrintWriter writer, int depth) {
 143         typeNode.genJavaDeclaration(writer, depth);
 144         super.genJavaDeclaration(writer, depth);
 145     }
 146 
 147     public String javaParam() {
 148         return typeNode.javaParam() + ", " + name() + " a" + name();
 149     }
 150 }