| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 com.sun.org.apache.bcel.internal.classfile; |
| |
| import java.io.DataInput; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import com.sun.org.apache.bcel.internal.Const; |
| |
| /** |
| * This class represents a reference to an unknown (i.e., |
| * application-specific) attribute of a class. It is instantiated from the |
| * {@link Attribute#readAttribute(java.io.DataInput, ConstantPool)} method. |
| * Applications that need to read in application-specific attributes should create an |
| * {@link UnknownAttributeReader} implementation and attach it via |
| * {@link Attribute#addAttributeReader(String, UnknownAttributeReader)}. |
| |
| * |
| * @version $Id: Unknown.java 1749603 2016-06-21 20:50:19Z ggregory $ |
| * @see Attribute |
| * @see UnknownAttributeReader |
| */ |
| public final class Unknown extends Attribute { |
| |
| private byte[] bytes; |
| private final String name; |
| private static final Map<String, Unknown> unknown_attributes = new HashMap<>(); |
| |
| |
| /** @return array of unknown attributes, but just one for each kind. |
| */ |
| static Unknown[] getUnknownAttributes() { |
| final Unknown[] unknowns = new Unknown[unknown_attributes.size()]; |
| unknown_attributes.values().toArray(unknowns); |
| unknown_attributes.clear(); |
| return unknowns; |
| } |
| |
| |
| /** |
| * Initialize from another object. Note that both objects use the same |
| * references (shallow copy). Use clone() for a physical copy. |
| */ |
| public Unknown(final Unknown c) { |
| this(c.getNameIndex(), c.getLength(), c.getBytes(), c.getConstantPool()); |
| } |
| |
| |
| /** |
| * Create a non-standard attribute. |
| * |
| * @param name_index Index in constant pool |
| * @param length Content length in bytes |
| * @param bytes Attribute contents |
| * @param constant_pool Array of constants |
| */ |
| public Unknown(final int name_index, final int length, final byte[] bytes, final ConstantPool constant_pool) { |
| super(Const.ATTR_UNKNOWN, name_index, length, constant_pool); |
| this.bytes = bytes; |
| name = ((ConstantUtf8) constant_pool.getConstant(name_index, Const.CONSTANT_Utf8)) |
| .getBytes(); |
| unknown_attributes.put(name, this); |
| } |
| |
| |
| /** |
| * Construct object from input stream. |
| * |
| * @param name_index Index in constant pool |
| * @param length Content length in bytes |
| * @param input Input stream |
| * @param constant_pool Array of constants |
| * @throws IOException |
| */ |
| Unknown(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) |
| throws IOException { |
| this(name_index, length, (byte[]) null, constant_pool); |
| if (length > 0) { |
| bytes = new byte[length]; |
| input.readFully(bytes); |
| } |
| } |
| |
| |
| /** |
| * Called by objects that are traversing the nodes of the tree implicitely |
| * defined by the contents of a Java class. I.e., the hierarchy of methods, |
| * fields, attributes, etc. spawns a tree of objects. |
| * |
| * @param v Visitor object |
| */ |
| @Override |
| public void accept( final Visitor v ) { |
| v.visitUnknown(this); |
| } |
| |
| |
| /** |
| * Dump unknown bytes to file stream. |
| * |
| * @param file Output file stream |
| * @throws IOException |
| */ |
| @Override |
| public final void dump( final DataOutputStream file ) throws IOException { |
| super.dump(file); |
| if (super.getLength() > 0) { |
| file.write(bytes, 0, super.getLength()); |
| } |
| } |
| |
| |
| /** |
| * @return data bytes. |
| */ |
| public final byte[] getBytes() { |
| return bytes; |
| } |
| |
| |
| /** |
| * @return name of attribute. |
| */ |
| @Override |
| public final String getName() { |
| return name; |
| } |
| |
| |
| /** |
| * @param bytes the bytes to set |
| */ |
| public final void setBytes( final byte[] bytes ) { |
| this.bytes = bytes; |
| } |
| |
| |
| /** |
| * @return String representation. |
| */ |
| @Override |
| public final String toString() { |
| if (super.getLength() == 0 || bytes == null) { |
| return "(Unknown attribute " + name + ")"; |
| } |
| String hex; |
| if (super.getLength() > 10) { |
| final byte[] tmp = new byte[10]; |
| System.arraycopy(bytes, 0, tmp, 0, 10); |
| hex = Utility.toHexString(tmp) + "... (truncated)"; |
| } else { |
| hex = Utility.toHexString(bytes); |
| } |
| return "(Unknown attribute " + name + ": " + hex + ")"; |
| } |
| |
| |
| /** |
| * @return deep copy of this attribute |
| */ |
| @Override |
| public Attribute copy( final ConstantPool _constant_pool ) { |
| final Unknown c = (Unknown) clone(); |
| if (bytes != null) { |
| c.bytes = new byte[bytes.length]; |
| System.arraycopy(bytes, 0, c.bytes, 0, bytes.length); |
| } |
| c.setConstantPool(_constant_pool); |
| return c; |
| } |
| } |