JDK14/Java14源码在线阅读

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 * 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.
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 * (the "License"); you may not use this file except in compliance with
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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 {@link Constant}
 * and represents a reference to a String object.
 *
 * @version $Id$
 * @see     Constant
 */
public final class ConstantString extends Constant implements ConstantObject {

    private int string_index; // Identical to ConstantClass except for this name


    /**
     * Initialize from another object.
     */
    public ConstantString(final ConstantString c) {
        this(c.getStringIndex());
    }


    /**
     * Initialize instance from file data.
     *
     * @param file Input stream
     * @throws IOException
     */
    ConstantString(final DataInput file) throws IOException {
        this(file.readUnsignedShort());
    }


    /**
     * @param string_index Index of Constant_Utf8 in constant pool
     */
    public ConstantString(final int string_index) {
        super(Const.CONSTANT_String);
        this.string_index = string_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.visitConstantString(this);
    }


    /**
     * Dump constant field reference to file stream in binary format.
     *
     * @param file Output file stream
     * @throws IOException
     */
    @Override
    public final void dump( final DataOutputStream file ) throws IOException {
        file.writeByte(super.getTag());
        file.writeShort(string_index);
    }


    /**
     * @return Index in constant pool of the string (ConstantUtf8).
     */
    public final int getStringIndex() {
        return string_index;
    }


    /**
     * @param string_index the index into the constant of the string value
     */
    public final void setStringIndex( final int string_index ) {
        this.string_index = string_index;
    }


    /**
     * @return String representation.
     */
    @Override
    public final String toString() {
        return super.toString() + "(string_index = " + string_index + ")";
    }


    /** @return String object

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