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LocalVariableTableAttribute.javaAPI DocJ2ME CLDC 1.12691Wed Feb 05 15:56:02 GMT 2003components

LocalVariableTableAttribute.java

/*
 *    LocalVariableTableAttribute.java    1.5    03/01/14
 *
 * Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package components;
import java.io.DataOutput;
import java.io.DataInput;
import java.io.IOException;
import util.DataFormatException;

/*
 * A class to represent the LocalVariable table Attribute
 * of a method's code.
 */

public
class LocalVariableTableAttribute extends Attribute
{
    public LocalVariableTableEntry    data[];

    public
    LocalVariableTableAttribute( UnicodeConstant name, int l, LocalVariableTableEntry d[] ){
    super( name, l );
    this.data = d;
    }

    public void
    externalize( ConstantPool p ){
    super.externalize( p );
     for (int i = 0; i < data.length; i++) {
        if (data[i].name != null) {
        data[i].name = (UnicodeConstant)p.add( data[i].name );
        }
        if (data[i].sig != null) {
        data[i].sig = (UnicodeConstant)p.add( data[i].sig );
        }
    }
    }

    protected int
    writeData( DataOutput o ) throws IOException{
    int n = data.length;
    o.writeShort( n );
    for ( int i = 0; i < n; i++ ){
        data[i].write( o );
    }
    return 2+LocalVariableTableEntry.size*n;
    }

    public void
    countConstantReferences( boolean isRelocatable ){
    super.countConstantReferences( isRelocatable );
    for (int i = 0; i < data.length; i++) {
        data[i].name.incReference();
        data[i].sig.incReference();
    }
    }

    public static Attribute
    readAttribute( DataInput i, ConstantObject globals[] ) throws IOException{
    UnicodeConstant name;

    name = (UnicodeConstant)globals[i.readUnsignedShort()];
    return finishReadAttribute( i, name, globals );
    }

    //
    // for those cases where we already read the name index
    // and know that its not something requiring special handling.
    //
    public static Attribute
    finishReadAttribute( DataInput in, UnicodeConstant name, ConstantObject globals[] ) throws IOException {
    int l;
    int n;
    LocalVariableTableEntry d[];

    l  = in.readInt();
    n  = in.readUnsignedShort();
    d = new LocalVariableTableEntry[ n ];
    for ( int i = 0; i < n; i++ ){
        d[i] = new
        LocalVariableTableEntry( in.readUnsignedShort(),
                     in.readUnsignedShort(),
                     (UnicodeConstant)
                     globals[in.readUnsignedShort()],
                     (UnicodeConstant)
                     globals[in.readUnsignedShort()],
                     in.readUnsignedShort()
                     );
    }
    return new LocalVariableTableAttribute( name, l, d );
    }
}