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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 Constant and represents a reference to a (external) class.
See Also:
/** * 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.
/** * Initialize from another object. */
public ConstantClass(final ConstantClass c) { this(c.getNameIndex()); }
Constructs an instance from file data.
Params:
  • dataInput – Input stream
Throws:
  • IOException – if an I/O error occurs reading from the given dataInput.
/** * 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()); }
Params:
  • name_index – Name index in constant pool. Should refer to a ConstantUtf8.
/** * @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.
Params:
  • v – Visitor object
/** * 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.
Params:
  • file – Output file stream
Throws:
  • IOException – if an I/O error occurs writing to the DataOutputStream.
/** * 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); }
Returns:Name index in constant pool of class name.
/** * @return Name index in constant pool of class name. */
public int getNameIndex() { return name_index; }
Params:
  • name_index – the name index in the constant pool of this Constant Class
/** * @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; }
Returns:String object
/** @return String object */
@Override public Object getConstantValue( final ConstantPool cp ) { final Constant c = cp.getConstant(name_index, Const.CONSTANT_Utf8); return ((ConstantUtf8) c).getBytes(); }
Returns:dereferenced string
/** @return dereferenced string */
public String getBytes( final ConstantPool cp ) { return (String) getConstantValue(cp); }
Returns:String representation.
/** * @return String representation. */
@Override public String toString() { return super.toString() + "(name_index = " + name_index + ")"; } }