1 /*
   2  * Copyright (c) 2011, 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 com.oracle.ipack.blobs;
  27 
  28 import java.io.DataOutput;
  29 import java.io.IOException;
  30 
  31 public abstract class SuperBlob<T extends Blob> extends Blob {
  32     private final SubBlob<T>[] subBlobs;
  33 
  34     protected SuperBlob(final int numberOfSubBlobs) {
  35         this.subBlobs = allocateSubBlobs(numberOfSubBlobs);
  36     }
  37 
  38     public final T getSubBlob(final int index) {
  39         return subBlobs[index].getBlob();
  40     }
  41 
  42     public final void setSubBlob(final int index, final int type,
  43                                  final T blob) {
  44         subBlobs[index].setType(type);
  45         subBlobs[index].setBlob(blob);
  46     }
  47 
  48     @Override
  49     protected final int getPayloadSize() {
  50         int size = 4 + subBlobs.length * 8;
  51         for (int i = 0; i < subBlobs.length; ++i) {
  52             size += subBlobs[i].getBlob().getSize();
  53         }
  54 
  55         return size;
  56     }
  57 
  58     @Override
  59     protected final void writePayload(final DataOutput dataOutput)
  60             throws IOException {
  61         dataOutput.writeInt(subBlobs.length);
  62         int offset = 8 + 4 + subBlobs.length * 8;
  63         for (int i = 0; i < subBlobs.length; ++i) {
  64             dataOutput.writeInt(subBlobs[i].getType());
  65             dataOutput.writeInt(offset);
  66 
  67             offset += subBlobs[i].getBlob().getSize();
  68         }
  69 
  70         for (int i = 0; i < subBlobs.length; ++i) {
  71             subBlobs[i].getBlob().write(dataOutput);
  72         }
  73     }
  74 
  75     @SuppressWarnings("unchecked")
  76     private static <T extends Blob> SubBlob<T>[] allocateSubBlobs(
  77             final int numberOfSubBlobs) {
  78         final SubBlob<T>[] subBlobs = new SubBlob[numberOfSubBlobs];
  79         for (int i = 0; i < numberOfSubBlobs; ++i) {
  80             subBlobs[i] = new SubBlob<T>();
  81         }
  82 
  83         return subBlobs;
  84     }
  85 
  86     private static final class SubBlob<T extends Blob> {
  87         private int type;
  88         private T blob;
  89 
  90         public int getType() {
  91             return type;
  92         }
  93 
  94         public void setType(final int type) {
  95             this.type = type;
  96         }
  97 
  98         public T getBlob() {
  99             return blob;
 100         }
 101 
 102         public void setBlob(final T blob) {
 103             this.blob = blob;
 104         }
 105     }
 106 }