1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.compress.harmony.unpack200.bytecode;
18
19 import java.io.DataOutputStream;
20 import java.io.IOException;
21
22 /**
23 * The abstract superclass for all types of class file entries.
24 */
25 public abstract class ClassFileEntry {
26
27 protected static final ClassFileEntry[] NONE = {};
28 private boolean resolved;
29
30 protected abstract void doWrite(DataOutputStream dos) throws IOException;
31
32 @Override
33 public abstract boolean equals(Object arg0);
34
35 protected ClassFileEntry[] getNestedClassFileEntries() {
36 return NONE;
37 }
38
39 @Override
40 public abstract int hashCode();
41
42 protected int objectHashCode() {
43 return super.hashCode();
44 }
45
46 /**
47 * Allows the constant pool entries to resolve their nested entries.
48 *
49 * @param pool TODO
50 */
51 protected void resolve(final ClassConstantPool pool) {
52 resolved = true;
53 }
54
55 @Override
56 public abstract String toString();
57
58 public final void write(final DataOutputStream dos) throws IOException {
59 if (!resolved) {
60 throw new IllegalStateException("Entry has not been resolved");
61 }
62 doWrite(dos);
63 }
64
65 }