definesprite.java

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/*
 * JSwiff is an open source Java API for Macromedia Flash file generation
 * and manipulation
 *
 * Copyright (C) 2004-2008 Ralf Terdic ([e-mail])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.jswiff.swfrecords.tags;

import com.jswiff.io.InputBitStream;
import com.jswiff.io.OutputBitStream;

import java.io.IOException;

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


/**
 * <p>
 * This tag defines a sprite character (i.e. a movie inside the main SWF
 * movie). It consists of a character ID, a frame count and several control
 * tags. Character instances referred to by these control tags in the sprite
 * must have been previously defined.
 * </p>
 * 
 * <p>
 * Once defined, the sprite can be displayed using the
 * <code>PlaceObject2</code> tag.
 * </p>
 *
 * @see PlaceObject2
 * @since SWF 3
 */
public final class DefineSprite extends DefinitionTag {
	private List controlTags = new ArrayList();

	/**
	 * Creates a new DefineSprite tag. Supply the character ID of the sprite.
	 * After tag creation, use <code>addControlTag()</code> to add tags to the
	 * sprite's tag list.
	 *
	 * @param characterId sprite's character ID
	 */
	public DefineSprite(int characterId) {
		code				 = TagConstants.DEFINE_SPRITE;
		this.characterId     = characterId;
	}

	DefineSprite() {
		// empty
	}

	/**
	 * Returns the list of control tags contained in the sprite.
	 *
	 * @return the sprite's control tags
	 */
	public List getControlTags() {
		return controlTags;
	}

	/**
	 * Returns the number of frames contained in the sprite.
	 *
	 * @return Returns the frameCount.
	 */
	public int getFrameCount() {
		int count = 0;
		for (Iterator i = controlTags.iterator(); i.hasNext();) {
			if (((Tag) i.next()).getCode() == TagConstants.SHOW_FRAME) {
				count++;
			}
		}
		return count;
	}

	/**
	 * Adds a control tag to the sprite. Do not use definition tags
	 * (<code>Define...</code>) here!
	 *
	 * @param controlTag a control tag
	 */
	public void addControlTag(Tag controlTag) {
		controlTags.add(controlTag);
	}

	protected void writeData(OutputBitStream outStream)
		throws IOException {
		forceLongHeader = true;
		outStream.writeUI16(characterId);
		outStream.writeUI16(getFrameCount());
		TagWriter.writeTags(outStream, controlTags, getSWFVersion());
	}

	void setData(byte[] data) throws IOException {
		InputBitStream inStream = new InputBitStream(data);
		characterId = inStream.readUI16();
		inStream.readUI16(); // frameCount
		do {
			Tag tag = TagReader.readTag(inStream, getSWFVersion(), isJapanese());
			if (tag.getCode() != TagConstants.END) {
				controlTags.add(tag);
			} else {
				break;
			}
		} while (true);
	}
}