FileDocCategorySizeDatePackage
MemberLoader.javaAPI DocJ2ME CLDC 1.17349Wed Feb 05 15:56:02 GMT 2003jcc

MemberLoader

public class MemberLoader extends Object

Fields Summary
String
fname
StreamTokenizer
in
ClassFileFinder
finder
ClassReader
rdr
Constructors Summary
public MemberLoader(ClassReader r, ClassFileFinder f)

    rdr = r;
    finder = f;
    
Methods Summary
private static voidcopyNonNull(ClassMemberInfo[] from, ClassMemberInfo[] to)

        int n = from.length;
        int j = 0;
        for ( int i = 0; i < n; i++ ){
        if ( from[i] != null ){
            from[i].index = j;
            to[j++] = from[i];
        }
        }
    
private intdeleteMembers(ClassMemberInfo[] mlist)

    if ( mlist == null || mlist.length == 0 )
        return 0; // trivial case.
    int n = mlist.length;
    int ndeleted = 0;
    for ( int i = 0; i < n; i++ ){
        if ( (mlist[i].flags&ClassMemberInfo.INCLUDE) == 0 ){
        mlist[i].index = -1; // obvious error value.
        mlist[i] = null;
        ndeleted+=1;
        }
    }
    return ndeleted;
    
public voiddeleteUnwantedMembers(java.util.Vector classes)

    Enumeration e = classes.elements();
    while ( e.hasMoreElements() ){
        ClassInfo ci = (ClassInfo) e.nextElement();
        if ( (ci.flags&ClassInfo.INCLUDE_ALL) != 0 )
        continue; // a fully-loaded class.
        loadMembers( ci );
    }
    
private ClassInfoenterClass(java.lang.String classname, java.util.Vector v)

    ClassInfo ce;
    classname = classname.intern();
    ce = components.ClassInfo.lookupClass( classname );
    if ( ce != null ) return ce;

    if ( rdr.readClass( classname, finder, v ) != 1 ){
        //could not find anywhere.
        System.err.println(Localizer.getString(
                   "memberloader.could_not_find_class", 
                    classname));
        return null; // or worse...
    }
    ce = (ClassInfo)( v.lastElement() );
    //
    // we know that this was loaded on account of us.
    // unlike most classes, this one will start life
    // as empty, with no members assumed.
    ce.flags &= ~(ClassInfo.INCLUDE_ALL);
    ce.clearMemberFlags( ClassMemberInfo.INCLUDE );
    return ce;
    
private booleanenterMember(ClassInfo ce, java.lang.String name)

    if ( (ce.flags&ClassInfo.INCLUDE_ALL) != 0 ){
        return true; // doesn't matter what we do anyway!
    }
    ClassMemberInfo t[];
    String sig;
    // determine if this is data or method by looking
    // at the signature, or lack thereof.
    int sigstart = name.indexOf( '(" );
    if ( sigstart == -1 ){
        // this is data.
        // too bad we cannot use the standard procedure
        // that  components/FMIrefConstant.find() uses,
        // but we cannot because the hash ID requires
        // data type signature information, which we lack.
        t = ce.fields;
        sig = null;
    } else {
        // this is code.
        //
        sig = name.substring( sigstart );
        name = name.substring( 0, sigstart );
        t = ce.methods;
    }
    int l = t.length;
    for ( int i = 0; i < l ; i++ ){
        if ( t[i].name.string.equals( name ) ){
        if ( (sig == null) || sig.equals( t[i].type.string ) ){
            t[i].flags |= ClassMemberInfo.INCLUDE;
            return true; // done.
        }
        }
    }
    System.err.println(Localizer.getString(
                   "memberloader.could_not_find_member",
                    ce.className, name));
    return false;
    
private voidloadMembers(ClassInfo ci)

    int ndeleted = deleteMembers( ci.methods );
    if ( ndeleted != 0 ){
        int n = ci.methods.length;
        MethodInfo newlist[] = new MethodInfo[ n-ndeleted ];
        copyNonNull( ci.methods, newlist );
        ci.methods = newlist;
    }
    ndeleted = deleteMembers( ci.fields );
    if ( ndeleted != 0 ){
        int n = ci.fields.length;
        FieldInfo newlist[] = new FieldInfo[ n-ndeleted ];
        copyNonNull( ci.fields, newlist );
        ci.fields = newlist;
    }
    
private voidoops(java.lang.String lmsg)

    String errmsg = Localizer.getString(
                "memberloader.dependence_file_error_near_line", 
                 fname, Integer.toString(in.lineno()));
    if ( lmsg != null ){
        errmsg += Localizer.getString(lmsg);
    }
    in = null; // when we bail, close the file.
    throw new DataFormatException( errmsg );
    
private voidopenStream(java.lang.String name)

    fname = name;
    in = new StreamTokenizer(
        new java.io.BufferedInputStream(
        new java.io.FileInputStream( fname ) ) );
    in.resetSyntax();
    in.eolIsSignificant( true );
    in.whitespaceChars( 0, 0x20 );
    in.wordChars( '!", '~" );
    in.commentChar('#");
    in.ordinaryChar( '." );

    
public voidreadFromFile(java.lang.String fname, java.util.Vector classlist)

    int t;
    openStream(fname);
    while ( (t = in.nextToken() ) != StreamTokenizer.TT_EOF ){
        /*
         * Process a line of input. It may be empty
         * or contain only a comment.
         * Else there must be a class name.
         * If the class name is followed by a .,
         * then a member name follows. The name
         * will include a signature, if a method is named.
         * No signature is needed for data members.
         */
        if ( t == StreamTokenizer.TT_EOL )
        continue;
        String className;
        String memberName;
        String sig;
        if ( t != StreamTokenizer.TT_WORD )
        oops("memberloader.missing_classname");
        className = in.sval;
        ClassInfo ce = enterClass( className, classlist );
        if ( (t=in.nextToken()) == StreamTokenizer.TT_EOL ){
        continue; // class name only
        }
        if ( t != '." ){
        oops( "memberloader.syntax_error" );
        continue;
        }
        if ( (t=in.nextToken()) != StreamTokenizer.TT_WORD ){
        oops("memberloader.malformed_member_name");
        continue;
        }
        memberName = in.sval;
        /*
         * Now that we've read the names, process it.
         */
        if ( ce != null )
        enterMember( ce, memberName );

        if ( in.nextToken() != StreamTokenizer.TT_EOL )
        oops("memberloader.extra_material");
    }
    in = null; // close the file.