Android Open Source - bankomatinfos Tag Impl

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License

The source code is released under:
GNU General Public License
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Java Source Code

/*
 * Copyright 2010 sasc/*w w w  .  j  ava 2s  .  c om*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package at.zweng.bankomatinfos.iso7816emv;

import java.util.Arrays;
import static at.zweng.bankomatinfos.util.Utils.*;

/**
 * source https://code.google.com/p/javaemvreader/
 * 
 * @author sasc
 */
public class TagImpl implements EmvTag {

  byte[] idBytes;
  String name;
  String description;
  TagValueType tagValueType;
  Class tagClass;

  TagType type;

  public TagImpl(String id, TagValueType tagValueType, String name,
      String description) {
    build(fromHexString(id), tagValueType, name, description);
  }

  public TagImpl(byte[] idBytes, TagValueType tagValueType, String name,
      String description) {
    build(idBytes, tagValueType, name, description);
  }

  private void build(byte[] idBytes, TagValueType tagValueType, String name,
      String description) {
    this.idBytes = idBytes;
    this.name = name;
    this.description = description;
    this.tagValueType = tagValueType;

    if (isBitSet(this.idBytes[0], 6)) {
      this.type = TagType.CONSTRUCTED;
    } else {
      this.type = TagType.PRIMITIVE;
    }
    // Bits 8 and 7 of the first byte of the tag field indicate a class.
    // The value 00 indicates a data object of the universal class.
    // The value 01 indicates a data object of the application class.
    // The value 10 indicates a data object of the context-specific class.
    // The value 11 indicates a data object of the private class.
    byte classValue = (byte) (this.idBytes[0] >>> 6 & 0x03);
    switch (classValue) {
    case (byte) 0x00:
      tagClass = Class.UNIVERSAL;
      break;
    case (byte) 0x01:
      tagClass = Class.APPLICATION;
      break;
    case (byte) 0x02:
      tagClass = Class.CONTEXT_SPECIFIC;
      break;
    case (byte) 0x03:
      tagClass = Class.PRIVATE;
      break;
    default:
      throw new RuntimeException("UNEXPECTED TAG CLASS: "
          + byte2BinaryLiteral(classValue) + " "
          + bytesToHex(this.idBytes) + " " + name);
    }

  }

  @Override
  public boolean isConstructed() {
    return type == TagType.CONSTRUCTED;
  }

  @Override
  public byte[] getTagBytes() {
    return idBytes;
  }

  @Override
  public String getName() {
    return name;
  }

  @Override
  public String getDescription() {
    return description;
  }

  @Override
  public TagValueType getTagValueType() {
    return tagValueType;
  }

  @Override
  public TagType getType() {
    return type;
  }

  @Override
  public Class getTagClass() {
    return tagClass;
  }

  @Override
  public boolean equals(Object other) {
    if (!(other instanceof EmvTag))
      return false;
    EmvTag that = (EmvTag) other;
    if (this.getTagBytes().length != that.getTagBytes().length)
      return false;

    return Arrays.equals(this.getTagBytes(), that.getTagBytes());
  }

  @Override
  public int hashCode() {
    int hash = 3;
    hash = 59 * hash + Arrays.hashCode(this.idBytes);
    return hash;
  }

  @Override
  public int getNumTagBytes() {
    return idBytes.length;
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("EmvTag[");
    sb.append(bytesToHex(getTagBytes()));
    sb.append("] Name=");
    sb.append(getName());
    sb.append(", TagType=");
    sb.append(getType());
    sb.append(", ValueType=");
    sb.append(getTagValueType());
    sb.append(", Class=");
    sb.append(tagClass);
    return sb.toString();
  }
}
Java Source Code List
