01: /*
02: * Copyright 2004 Brian S O'Neill
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16:
17: package org.cojen.classfile.attribute;
18:
19: import java.io.DataInput;
20: import java.io.DataOutput;
21: import java.io.IOException;
22: import org.cojen.classfile.Attribute;
23: import org.cojen.classfile.ConstantPool;
24: import org.cojen.classfile.constant.ConstantUTFInfo;
25:
26: /**
27: * This class corresponds to the signature attribute structure, which is used
28: * to support generics.
29: *
30: * @author Brian S O'Neill
31: */
32: public class SignatureAttr extends Attribute {
33: private final ConstantUTFInfo mSignature;
34:
35: public SignatureAttr(ConstantPool cp, ConstantUTFInfo signature) {
36: this (cp, SIGNATURE, signature);
37: }
38:
39: public SignatureAttr(ConstantPool cp, String name,
40: ConstantUTFInfo signature) {
41: super (cp, name);
42: mSignature = signature;
43: }
44:
45: public SignatureAttr(ConstantPool cp, String name, int length,
46: DataInput din) throws IOException {
47: super (cp, name);
48: int index = din.readUnsignedShort();
49: if ((length -= 2) > 0) {
50: din.skipBytes(length);
51: }
52: mSignature = (ConstantUTFInfo) cp.getConstant(index);
53: }
54:
55: /**
56: * Returns the signature.
57: */
58: public ConstantUTFInfo getSignature() {
59: return mSignature;
60: }
61:
62: /**
63: * Returns the length of the signature attribute, which is 2 bytes.
64: */
65: public int getLength() {
66: return 2;
67: }
68:
69: public void writeDataTo(DataOutput dout) throws IOException {
70: dout.writeShort(mSignature.getIndex());
71: }
72: }
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