1 /*

     2  * Copyright (c) 2007, 2008, 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.sun.tools.classfile;

    27 

    28 import java.io.IOException;

    29 import java.util.Arrays;

    30 import java.util.HashMap;

    31 import java.util.Iterator;

    32 import java.util.Map;

    33 

    34 /*

    35  *  <p><b>This is NOT part of any supported API.

    36  *  If you write code that depends on this, you do so at your own risk.

    37  *  This code and its internal interfaces are subject to change or

    38  *  deletion without notice.</b>

    39  */

    40 public class Attributes implements Iterable<Attribute> {

    41 

    42     public final Attribute[] attrs;

    43     public final Map<String, Attribute> map;

    44 

    45     Attributes(ClassReader cr) throws IOException {

    46         map = new HashMap<>();

    47         int attrs_count = cr.readUnsignedShort();

    48         attrs = new Attribute[attrs_count];

    49         for (int i = 0; i < attrs_count; i++) {

    50             Attribute attr = Attribute.read(cr);

    51             attrs[i] = attr;

    52             try {

    53                 map.put(attr.getName(cr.getConstantPool()), attr);

    54             } catch (ConstantPoolException e) {

    55                 // don't enter invalid names in map

    56             }

    57         }

    58     }

    59 

    60     public Attributes(ConstantPool constant_pool, Attribute[] attrs) {

    61         this.attrs = attrs;

    62         map = new HashMap<>();

    63         for (Attribute attr : attrs) {

    64             try {

    65                 map.put(attr.getName(constant_pool), attr);

    66             } catch (ConstantPoolException e) {

    67                 // don't enter invalid names in map

    68             }

    69         }

    70     }

    71 

    72     public Iterator<Attribute> iterator() {

    73         return Arrays.asList(attrs).iterator();

    74     }

    75 

    76     public Attribute get(int index) {

    77         return attrs[index];

    78     }

    79 

    80     public Attribute get(String name) {

    81         return map.get(name);

    82     }

    83 

    84     public int getIndex(ConstantPool constant_pool, String name) {

    85         for (int i = 0; i < attrs.length; i++) {

    86             Attribute attr = attrs[i];

    87             try {

    88                 if (attr != null && attr.getName(constant_pool).equals(name))

    89                     return i;

    90             } catch (ConstantPoolException e) {

    91                 // ignore invalid entries

    92             }

    93         }

    94         return -1;

    95     }

    96 

    97     public int size() {

    98         return attrs.length;

    99     }

   100 

   101     public int byteLength() {

   102         int length = 2;

   103         for (Attribute a: attrs)

   104             length += a.byteLength();

   105         return length;

   106     }

   107 }