package runEnv;

import runEnv.basicValue.*;

public class PtrValue extends RunValue {

/*
Represents the address of a value
*/

	private Multiple base;
	private int offset;

	public PtrValue( Multiple base, int offset ) {
		this.base = base;
		this.offset = offset;
		}

	public PtrValue( Multiple base ) {
		this( base, 0 );
		}

	public PtrValue( String value ) {
		this( new Multiple( value ) );
		}

	public RunValue getValue() {
		return base.getValue( offset );
		}

	public void setValue( RunValue value ) {
		base.setValue( offset, value );
		}

	public PtrValue elementAt( int index ) {
		return new PtrValue( base, offset + index );
		}

	public PtrValue addressValue() {
		return this;
		}

	public String toString() {
		return base.name() + "(" + Integer.toHexString( base.size() ) + ")+" 
			+ Integer.toHexString( offset );
		}

	public String stringValue() {
		String result = "";
		for ( int i = 0; ; i++ ) {
			char c = base.getValue( offset + i ).charValue();
			if ( c == 0 )
				return result;
			result += c;
			}
		}

	public PtrValue setStringValue( String s ) {
		for ( int i = 0; i < s.length(); i++ ) {
			char c = s.charAt( i );
			base.setValue( offset + i, new CharValue( c ) );
			}
		base.setValue( offset + s.length(), new CharValue( '\0' ) );
		return elementAt( s.length() );
		}

	public boolean equals( RunValue otherValue ) {
		if ( ! ( otherValue instanceof PtrValue ) )
			return false;
		PtrValue otherAddress = ( PtrValue ) otherValue;
		return base == otherAddress.base && offset == otherAddress.offset;
		}
	}