| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package flash.swf; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * Base class for all SWF tags. |
| */ |
| public abstract class Tag |
| implements TagValues |
| { |
| final public int code; |
| |
| public Tag(int code) |
| { |
| this.code = code; |
| } |
| |
| /** |
| * Subclasses implement this method to callback one of the methods in TagHandler... |
| * @param h |
| */ |
| public abstract void visit(TagHandler h); |
| |
| /** |
| * many tags have zero or one reference, in which case they only need |
| * to override this method. Tags that have two or more references |
| * should override getReferences() and provide an Iterator. |
| * @return |
| */ |
| protected Tag getSimpleReference() |
| { |
| return null; |
| } |
| |
| /** |
| * Find the immediate dependencies. unlike visitDefs, it doesn't explore the entire tree. |
| * The user must do a recursive walk if they care to go beyond the first order dependencies. |
| * The default implementation provides an iterator over a single simple reference, defined |
| * by the derived class via the getSimpleReference() call. |
| * @return An iterator over the first order Tag dependencies. |
| */ |
| |
| public Iterator<Tag> getReferences() |
| { |
| return new Iterator<Tag>() |
| { |
| private boolean done = false; |
| |
| public boolean hasNext() |
| { |
| return (!((getSimpleReference() == null) || done)); |
| } |
| public Tag next() |
| { |
| if ( hasNext() ) |
| { |
| done = true; |
| return getSimpleReference(); |
| } |
| throw new NoSuchElementException(); |
| } |
| public void remove() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| |
| public boolean equals(Object object) |
| { |
| boolean isEqual = false; |
| |
| if (object instanceof Tag) |
| { |
| Tag tag = (Tag) object; |
| |
| if (tag.code == this.code) |
| { |
| isEqual = true; |
| } |
| } |
| |
| return isEqual; |
| } |
| |
| public int hashCode() |
| { |
| return code; |
| } |
| |
| public static boolean equals(Object o1, Object o2) |
| { |
| return o1 == o2 || o1 != null && o1.equals(o2); |
| } |
| } |