001 /*
002 * Copyright 2007-2008 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package com.sun.tools.classfile;
027
028 import java.io.File;
029 import java.io.FileInputStream;
030 import java.io.IOException;
031 import java.io.InputStream;
032
033 import static com.sun.tools.classfile.AccessFlags.*;
034
035 /**
036 * See JVMS3, section 4.2.
037 *
038 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
039 * you write code that depends on this, you do so at your own risk.
040 * This code and its internal interfaces are subject to change or
041 * deletion without notice.</b>
042 */
043 public class ClassFile {
044 public static ClassFile read(File file)
045 throws IOException, ConstantPoolException {
046 return read(file, new Attribute.Factory());
047 }
048
049 public static ClassFile read(File file, Attribute.Factory attributeFactory)
050 throws IOException, ConstantPoolException {
051 FileInputStream in = new FileInputStream(file);
052 try {
053 return new ClassFile(in, attributeFactory);
054 } finally {
055 try {
056 in.close();
057 } catch (IOException e) {
058 // ignore
059 }
060 }
061 }
062
063 public static ClassFile read(InputStream in)
064 throws IOException, ConstantPoolException {
065 return new ClassFile(in, new Attribute.Factory());
066 }
067
068 public static ClassFile read(InputStream in, Attribute.Factory attributeFactory)
069 throws IOException, ConstantPoolException {
070 return new ClassFile(in, attributeFactory);
071 }
072
073 ClassFile(InputStream in, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException {
074 ClassReader cr = new ClassReader(this, in, attributeFactory);
075 magic = cr.readInt();
076 minor_version = cr.readUnsignedShort();
077 major_version = cr.readUnsignedShort();
078 constant_pool = new ConstantPool(cr);
079 access_flags = new AccessFlags(cr);
080 this_class = cr.readUnsignedShort();
081 super_class = cr.readUnsignedShort();
082
083 int interfaces_count = cr.readUnsignedShort();
084 interfaces = new int[interfaces_count];
085 for (int i = 0; i < interfaces_count; i++)
086 interfaces[i] = cr.readUnsignedShort();
087
088 int fields_count = cr.readUnsignedShort();
089 fields = new Field[fields_count];
090 for (int i = 0; i < fields_count; i++)
091 fields[i] = new Field(cr);
092
093 int methods_count = cr.readUnsignedShort();
094 methods = new Method[methods_count];
095 for (int i = 0; i < methods_count; i++)
096 methods[i] = new Method(cr);
097
098 attributes = new Attributes(cr);
099 }
100
101 public ClassFile(int magic, int minor_version, int major_version,
102 ConstantPool constant_pool, AccessFlags access_flags,
103 int this_class, int super_class, int[] interfaces,
104 Field[] fields, Method[] methods, Attributes attributes) {
105 this.magic = magic;
106 this.minor_version = minor_version;
107 this.major_version = major_version;
108 this.constant_pool = constant_pool;
109 this.access_flags = access_flags;
110 this.this_class = this_class;
111 this.super_class = super_class;
112 this.interfaces = interfaces;
113 this.fields = fields;
114 this.methods = methods;
115 this.attributes = attributes;
116 }
117
118 public String getName() throws ConstantPoolException {
119 return constant_pool.getClassInfo(this_class).getName();
120 }
121
122 public String getSuperclassName() throws ConstantPoolException {
123 return constant_pool.getClassInfo(super_class).getName();
124 }
125
126 public String getInterfaceName(int i) throws ConstantPoolException {
127 return constant_pool.getClassInfo(interfaces[i]).getName();
128 }
129
130 public Attribute getAttribute(String name) {
131 return attributes.get(name);
132 }
133
134 public boolean isClass() {
135 return !isInterface();
136 }
137
138 public boolean isInterface() {
139 return access_flags.is(ACC_INTERFACE);
140 }
141
142 public final int magic;
143 public final int minor_version;
144 public final int major_version;
145 public final ConstantPool constant_pool;
146 public final AccessFlags access_flags;
147 public final int this_class;
148 public final int super_class;
149 public final int[] interfaces;
150 public final Field[] fields;
151 public final Method[] methods;
152 public final Attributes attributes;
153 }