1 /*
   2  * Copyright (c) 2014, 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 jdk.internal.jimage;
  27 
  28 public final class ImageLocationWriter extends ImageLocationBase {
  29     private int locationOffset;
  30 
  31     private ImageLocationWriter(ImageStringsWriter strings) {
  32         super(new long[ATTRIBUTE_COUNT], strings);
  33     }
  34 
  35     void writeTo(ImageStream stream) {
  36         byte[] bytes = ImageLocation.compress(attributes);
  37         locationOffset = stream.getPosition();
  38         stream.put(bytes, 0, bytes.length);
  39     }
  40 
  41     private ImageLocationWriter addAttribute(int kind, long value) {
  42         assert ATTRIBUTE_END < kind &&
  43                kind < ATTRIBUTE_COUNT : "Invalid attribute kind";
  44         attributes[kind] = value;
  45         return this;
  46     }
  47 
  48     private ImageLocationWriter addAttribute(int kind, UTF8String value) {
  49         return addAttribute(kind, strings.add(value));
  50     }
  51 
  52     static ImageLocationWriter newLocation(UTF8String fullName,
  53             ImageStringsWriter strings,
  54             long contentOffset, long compressedSize, long uncompressedSize) {
  55         UTF8String moduleName = UTF8String.EMPTY_STRING;
  56         UTF8String parentName = UTF8String.EMPTY_STRING;
  57         UTF8String baseName;
  58         UTF8String extensionName = UTF8String.EMPTY_STRING;
  59 
  60         int offset = fullName.indexOf('/', 1);
  61         if (fullName.length() >= 2 && fullName.charAt(0) == '/' && offset != -1) {
  62             moduleName = fullName.substring(1, offset - 1);
  63             fullName = fullName.substring(offset + 1);
  64         }
  65 
  66         offset = fullName.lastIndexOf('/');
  67         if (offset != -1) {
  68             parentName = fullName.substring(0, offset);
  69             fullName = fullName.substring(offset + 1);
  70         }
  71 
  72         offset = fullName.lastIndexOf('.');
  73         if (offset != -1) {
  74             baseName = fullName.substring(0, offset);
  75             extensionName = fullName.substring(offset + 1);
  76         } else {
  77             baseName = fullName;
  78         }
  79 
  80         return new ImageLocationWriter(strings)
  81                .addAttribute(ATTRIBUTE_MODULE, moduleName)
  82                .addAttribute(ATTRIBUTE_PARENT, parentName)
  83                .addAttribute(ATTRIBUTE_BASE, baseName)
  84                .addAttribute(ATTRIBUTE_EXTENSION, extensionName)
  85                .addAttribute(ATTRIBUTE_OFFSET, contentOffset)
  86                .addAttribute(ATTRIBUTE_COMPRESSED, compressedSize)
  87                .addAttribute(ATTRIBUTE_UNCOMPRESSED, uncompressedSize);
  88     }
  89 
  90     @Override
  91     public int hashCode() {
  92         return hashCode(UTF8String.HASH_MULTIPLIER);
  93     }
  94 
  95     int hashCode(int seed) {
  96         int hash = seed;
  97 
  98         if (getModuleOffset() != 0) {
  99             hash = UTF8String.SLASH_STRING.hashCode(hash);
 100             hash = getModule().hashCode(hash);
 101             hash = UTF8String.SLASH_STRING.hashCode(hash);
 102         }
 103 
 104         if (getParentOffset() != 0) {
 105             hash = getParent().hashCode(hash);
 106             hash = UTF8String.SLASH_STRING.hashCode(hash);
 107         }
 108 
 109         hash = getBase().hashCode(hash);
 110 
 111         if (getExtensionOffset() != 0) {
 112             hash = UTF8String.DOT_STRING.hashCode(hash);
 113             hash = getExtension().hashCode(hash);
 114         }
 115 
 116         return hash;
 117     }
 118 
 119     @Override
 120     public boolean equals(Object obj) {
 121         if (this == obj) {
 122             return true;
 123         }
 124 
 125         if (!(obj instanceof ImageLocationWriter)) {
 126             return false;
 127         }
 128 
 129         ImageLocation other = (ImageLocation)obj;
 130 
 131         return getModuleOffset() == other.getModuleOffset() &&
 132                getParentOffset() == other.getParentOffset() &&
 133                getBaseOffset() == other.getBaseOffset() &&
 134                getExtensionOffset() == other.getExtensionOffset();
 135     }
 136 
 137     int getLocationOffset() {
 138         return locationOffset;
 139     }
 140 }