| /* |
| * 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 com.sun.org.apache.bcel.internal.Const; |
| |
| /** |
| * This class is derived from the abstract {@link Constant} |
| * and represents a reference to a (external) class. |
| * |
| * @see Constant |
| */ |
| public final class ConstantClass extends Constant implements ConstantObject { |
| |
| private int name_index; // Identical to ConstantString except for the name |
| |
| |
| /** |
| * Initialize from another object. |
| */ |
| public ConstantClass(final ConstantClass c) { |
| this(c.getNameIndex()); |
| } |
| |
| |
| /** |
| * Constructs an instance from file data. |
| * |
| * @param dataInput Input stream |
| * @throws IOException if an I/O error occurs reading from the given {@code dataInput}. |
| */ |
| ConstantClass(final DataInput dataInput) throws IOException { |
| this(dataInput.readUnsignedShort()); |
| } |
| |
| |
| /** |
| * @param name_index Name index in constant pool. Should refer to a |
| * ConstantUtf8. |
| */ |
| public ConstantClass(final int name_index) { |
| super(Const.CONSTANT_Class); |
| this.name_index = name_index; |
| } |
| |
| |
| /** |
| * 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.visitConstantClass(this); |
| } |
| |
| |
| /** |
| * Dumps constant class to file stream in binary format. |
| * |
| * @param file Output file stream |
| * @throws IOException if an I/O error occurs writing to the DataOutputStream. |
| */ |
| @Override |
| public void dump( final DataOutputStream file ) throws IOException { |
| file.writeByte(super.getTag()); |
| file.writeShort(name_index); |
| } |
| |
| |
| /** |
| * @return Name index in constant pool of class name. |
| */ |
| public int getNameIndex() { |
| return name_index; |
| } |
| |
| |
| /** |
| * @param name_index the name index in the constant pool of this Constant Class |
| */ |
| public void setNameIndex( final int name_index ) { |
| this.name_index = name_index; |
| } |
| |
| |
| /** @return String object |
| */ |
| @Override |
| public Object getConstantValue( final ConstantPool cp ) { |
| final Constant c = cp.getConstant(name_index, Const.CONSTANT_Utf8); |
| return ((ConstantUtf8) c).getBytes(); |
| } |
| |
| |
| /** @return dereferenced string |
| */ |
| public String getBytes( final ConstantPool cp ) { |
| return (String) getConstantValue(cp); |
| } |
| |
| |
| /** |
| * @return String representation. |
| */ |
| @Override |
| public String toString() { |
| return super.toString() + "(name_index = " + name_index + ")"; |
| } |
| } |