swftag.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.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import com.anotherbigidea.flash.interfaces.SWFTagTypes;

/**
 * Base for all SWF tags.
 * 
 * @author Nick
 */
public abstract class SWFTag {
    
    /** The frame that contains the tag */
    private SWFFrame frame;
    
    private List references;
    
    /** Add a reference to a symbol */
    protected void addReference( SWFSymbol symbol ) {
    	if( references == null ) {
    		references = new ArrayList();
    	}
    	
    	references.add( symbol );
    	symbol.makeReference( this );
    }
    
    /** Get the frame this tag appears in */
    public SWFFrame getFrame() {
        return frame;
    }
    
    /* package */ void setFrame( SWFFrame frame ) {
        this.frame = frame;
    }
    
    /**
     * Write the tag.
     * @param tagOutput the tag output
     */
    public abstract void writeTag( SWFTagTypes tagOutput ) throws IOException;
    
    /** Get the number of references this tag has to SWFSymbols */
    public int referenceCount() {
    	if( references == null ) return 0;
    	return references.size();
    }
    
    /**
     * Get all the symbol references made by this tag.
     */
    public Iterator getSymbolReferences() {
        if( references == null ) {
        	return Collections.EMPTY_LIST.iterator();
        }
        
        return references.iterator();
    }
}