swfsymbol.java

java和flash混合编程

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 * Copyright (c) 2004, David N. Main, All rights reserved.
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package org.javaswf.swf.model;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * Base for SWF objects that have an id
 * @author Nick
 */
public abstract class SWFSymbol extends SWFTag {

    private int id;
    private List incomingReferences = new ArrayList();
    
    protected SWFSymbol( int id ) {
        this.id = id;
    }
    
    /**
     * @return the numeric id of the symbol
     */
    public int getSymbolId() {
        return id;
    }
    
    /**
     * Get the references to this symbol
     * @return SWFTag instances
     */
    public Iterator getIncomingReferences() {
    	return incomingReferences.iterator();
    }
    
    /**
     * Make a new reference to this symbol.
     * A given tag may have more than one reference to this symbol
     * 
     * @param referer the tag that refers to this symbol
     */
    public void makeReference( SWFTag referer ) {
    	incomingReferences.add( referer );
    }
    
    /**
     * Remove a reference.  Only one reference is removed, other references
     * from the same tag are left intact.
     * 
     * @param referer the tag to remove
     */
    public void removeReference( SWFTag referer ) {
    	incomingReferences.remove( referer );
    }
}