Scala example source code file (JEnclosingMethodAttribute.java)

This example Scala source code file (JEnclosingMethodAttribute.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

datainputstream, enclosingmethod, io, ioexception, ioexception, jclass, jconstantpool, jenclosingmethodattribute, jenclosingmethodattribute, jtype, object, string, string, stringbuffer, stringbuffer

The Scala JEnclosingMethodAttribute.java source code

/* FJBG -- Fast Java Bytecode Generator
 * Copyright 2002-2011 LAMP/EPFL
 * @author  Michel Schinz
 */

package ch.epfl.lamp.fjbg;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

/**
 * EclosingMethod attribute

 * A class must have an EnclosingMethod attribute if and only if it is a
 * local class or an anonymous class. A class may have no more than one
 * EnclosingMethod attribute. See section 4.8.6 of the JVM specification.
 *
 * @author Michel Schinz
 * @version 1.0
 */

public class JEnclosingMethodAttribute extends JAttribute {
    /** Constant pool of the current classfile. */
    private JConstantPool pool;

    protected final int classIdx;
    protected final int nameAndTypeIdx;

    public JEnclosingMethodAttribute(FJBGContext context,
                                     JClass clazz,
                                     String className,
                                     String methodName,
                                     JType methodType) {
        super(context, clazz);
        this.pool = clazz.pool;

        this.classIdx = pool.addClass(className);
        this.nameAndTypeIdx = pool.addNameAndType(methodName, methodType.getSignature());
    }

    public JEnclosingMethodAttribute(FJBGContext context,
                                     JClass clazz,
                                     Object owner,
                                     String name,
                                     int size,
                                     DataInputStream stream)
        throws IOException {
        super(context, clazz, name);
        this.pool = clazz.pool;

        this.classIdx = stream.readShort();
        this.nameAndTypeIdx = stream.readShort();

        assert name.equals(getName());
    }

    public String getName() { return "EnclosingMethod"; }

    // Follows javap output format for EnclosingMethod attribute.
    /*@Override*/ public String toString() {
        StringBuffer buf = new StringBuffer("  EnclosingMethod:");
        buf.append("\n   #");
        buf.append(classIdx);
        if (nameAndTypeIdx != 0) {
            buf.append(" of #");
            buf.append(nameAndTypeIdx);
        }
        buf.append(";\t//  ");
        buf.append(pool.lookupEntry(classIdx));
        buf.append("\n");
        return buf.toString();
    }

    protected int getSize() {
        return 4; // 2 * Short.SIZE
    }

    protected void writeContentsTo(DataOutputStream stream) throws IOException {
        stream.writeShort(classIdx);
        stream.writeShort(nameAndTypeIdx);
    }
}