01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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:
18: package org.apache.harmony.jndi.provider.ldap.asn1;
19:
20: import java.io.IOException;
21:
22: import org.apache.harmony.security.asn1.ASN1Constants;
23: import org.apache.harmony.security.asn1.ASN1Primitive;
24: import org.apache.harmony.security.asn1.BerInputStream;
25: import org.apache.harmony.security.asn1.BerOutputStream;
26:
27: /**
28: * This class represents ASN.1 Null type.
29: */
30: public class ASN1Null extends ASN1Primitive {
31: private static final ASN1Null asn1Null = new ASN1Null();
32:
33: public static ASN1Null getInstance() {
34: return asn1Null;
35: }
36:
37: private ASN1Null() {
38: super (ASN1Constants.TAG_NULL);
39: }
40:
41: @Override
42: public Object decode(BerInputStream in) throws IOException {
43: if (in.tag != ASN1Constants.TAG_NULL || in.getLength() != 0) {
44: throw new IOException();
45: }
46: return new byte[0];
47: }
48:
49: @Override
50: public void encodeContent(BerOutputStream out) {
51: // do nothing
52: }
53:
54: @Override
55: public void setEncodingContent(BerOutputStream out) {
56: out.length = 0;
57: }
58:
59: }
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