NestHost.java
- /*
- * 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 org.apache.bcel.classfile;
- import java.io.DataInput;
- import java.io.DataOutputStream;
- import java.io.IOException;
- import org.apache.bcel.Const;
- import org.apache.bcel.util.Args;
- /**
- * This class is derived from <em>Attribute</em> and records the nest host of the nest to which the current class or
- * interface claims to belong. There may be at most one NestHost attribute in a ClassFile structure.
- *
- * @see Attribute
- */
- public final class NestHost extends Attribute {
- private int hostClassIndex;
- /**
- * Constructs object from input stream.
- *
- * @param nameIndex Index in constant pool
- * @param length Content length in bytes
- * @param input Input stream
- * @param constantPool Array of constants
- * @throws IOException if an I/O error occurs.
- */
- NestHost(final int nameIndex, final int length, final DataInput input, final ConstantPool constantPool) throws IOException {
- this(nameIndex, length, 0, constantPool);
- hostClassIndex = input.readUnsignedShort();
- }
- /**
- * @param nameIndex Index in constant pool
- * @param length Content length in bytes
- * @param hostClassIndex Host class index
- * @param constantPool Array of constants
- */
- public NestHost(final int nameIndex, final int length, final int hostClassIndex, final ConstantPool constantPool) {
- super(Const.ATTR_NEST_MEMBERS, nameIndex, length, constantPool);
- this.hostClassIndex = Args.requireU2(hostClassIndex, "hostClassIndex");
- }
- /**
- * Initializes from another object. Note that both objects use the same references (shallow copy). Use copy() for a
- * physical copy.
- *
- * @param c Source to copy.
- */
- public NestHost(final NestHost c) {
- this(c.getNameIndex(), c.getLength(), c.getHostClassIndex(), c.getConstantPool());
- }
- /**
- * Called by objects that are traversing the nodes of the tree implicitly 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.visitNestHost(this);
- }
- /**
- * @return deep copy of this attribute
- */
- @Override
- public Attribute copy(final ConstantPool constantPool) {
- final NestHost c = (NestHost) clone();
- c.setConstantPool(constantPool);
- return c;
- }
- /**
- * Dumps NestHost attribute to file stream in binary format.
- *
- * @param file Output file stream
- * @throws IOException if an I/O error occurs.
- */
- @Override
- public void dump(final DataOutputStream file) throws IOException {
- super.dump(file);
- file.writeShort(hostClassIndex);
- }
- /**
- * @return index into constant pool of host class name.
- */
- public int getHostClassIndex() {
- return hostClassIndex;
- }
- /**
- * @param hostClassIndex the host class index
- */
- public void setHostClassIndex(final int hostClassIndex) {
- this.hostClassIndex = hostClassIndex;
- }
- /**
- * @return String representation
- */
- @Override
- public String toString() {
- final StringBuilder buf = new StringBuilder();
- buf.append("NestHost: ");
- final String className = super.getConstantPool().getConstantString(hostClassIndex, Const.CONSTANT_Class);
- buf.append(Utility.compactClassName(className, false));
- return buf.toString();
- }
- }