12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.bcel.internal.util;
  23 
  24 import java.io.ByteArrayInputStream;
  25 import java.io.DataInputStream;
  26 
  27 /**
  28  * Utility class that implements a sequence of bytes which can be read
  29  * via the `readByte()' method. This is used to implement a wrapper for the
  30  * Java byte code stream to gain some more readability.
  31  *
  32  * @version $Id$
  33  */
  34 public final class ByteSequence extends DataInputStream {
  35 
  36     private final ByteArrayStream byteStream;
  37 
  38 
  39     public ByteSequence(final byte[] bytes) {
  40         super(new ByteArrayStream(bytes));
  41         byteStream = (ByteArrayStream) in;
  42     }
  43 
  44 
  45     public final int getIndex() {
  46         return byteStream.getPosition();
  47     }
  48 
  49 
  50     final void unreadByte() {
  51         byteStream.unreadByte();
  52     }
  53 
  54     private static final class ByteArrayStream extends ByteArrayInputStream {
  55 
  56         ByteArrayStream(final byte[] bytes) {
  57             super(bytes);
  58         }
  59 
  60         final int getPosition() {
  61             // pos is protected in ByteArrayInputStream
  62             return pos;
  63         }
  64 
  65         final void unreadByte() {
  66             if (pos > 0) {
  67                 pos--;
  68             }
  69         }
  70     }
  71 }

  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.bcel.internal.util;
  23 
  24 import java.io.ByteArrayInputStream;
  25 import java.io.DataInputStream;
  26 
  27 /**
  28  * Utility class that implements a sequence of bytes which can be read
  29  * via the `readByte()' method. This is used to implement a wrapper for the
  30  * Java byte code stream to gain some more readability.
  31  *

  32  */
  33 public final class ByteSequence extends DataInputStream {
  34 
  35     private final ByteArrayStream byteStream;
  36 
  37 
  38     public ByteSequence(final byte[] bytes) {
  39         super(new ByteArrayStream(bytes));
  40         byteStream = (ByteArrayStream) in;
  41     }
  42 
  43 
  44     public int getIndex() {
  45         return byteStream.getPosition();
  46     }
  47 
  48 
  49     void unreadByte() {
  50         byteStream.unreadByte();
  51     }
  52 
  53     private static final class ByteArrayStream extends ByteArrayInputStream {
  54 
  55         ByteArrayStream(final byte[] bytes) {
  56             super(bytes);
  57         }
  58 
  59         int getPosition() {
  60             // pos is protected in ByteArrayInputStream
  61             return pos;
  62         }
  63 
  64         void unreadByte() {
  65             if (pos > 0) {
  66                 pos--;
  67             }
  68         }
  69     }
  70 }