content: /*
   * Copyright (c) 2009-2013 Panxiaobo
   * 
   * Licensed 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 pxb.android.axml;
  
  import static pxb.android.axml.AxmlParser.END_FILE;
  import static pxb.android.axml.AxmlParser.END_NS;
  import static pxb.android.axml.AxmlParser.END_TAG;
  import static pxb.android.axml.AxmlParser.START_FILE;
  import static pxb.android.axml.AxmlParser.START_NS;
  import static pxb.android.axml.AxmlParser.START_TAG;
  import static pxb.android.axml.AxmlParser.TEXT;
  
  import java.io.IOException;
  import java.util.Stack;
  
  /**
   * a class to read android axml
   * 
   * @author <a href="mailto:pxb1988@gmail.com">Panxiaobo</a>
   */
  public class AxmlReader {
  	public static final NodeVisitor EMPTY_VISITOR = new NodeVisitor() {
  
  		@Override
  		public NodeVisitor child(String ns, String name) {
  			return this;
  		}
  
  	};
  	final AxmlParser parser;
  
  	public AxmlReader(byte[] data) {
  		super();
  		this.parser = new AxmlParser(data);
  	}
  
  	public void accept(final AxmlVisitor av) throws IOException {
  		Stack<NodeVisitor> nvs = new Stack<NodeVisitor>();
  		NodeVisitor tos = av;
  		while (true) {
  			int type = parser.next();
  			switch (type) {
  			case START_FILE:
  				break;
  			case START_TAG:
  				nvs.push(tos);
  				tos = tos.child(parser.getNamespaceUri(), parser.getName());
  				if (tos != null) {
  					if (tos != EMPTY_VISITOR) {
  						tos.line(parser.getLineNumber());
  						for (int i = 0; i < parser.getAttrCount(); i++) {
  							tos.attr(parser.getAttrNs(i), parser.getAttrName(i), parser.getAttrResId(i),
  									parser.getAttrType(i), parser.getAttrValue(i));
  						}
  					}
  				} else {
  					tos = EMPTY_VISITOR;
  				}
  				break;
  			case END_TAG:
  				tos.end();
  				tos = nvs.pop();
  				break;
  			case START_NS:
  				av.ns(parser.getNamespacePrefix(), parser.getNamespaceUri(), parser.getLineNumber());
  				break;
  			case END_NS:
  				break;
  			case TEXT:
  				tos.text(parser.getLineNumber(), parser.getText());
  				break;
  			case END_FILE:
  				return;
  			default:
  				System.err.println("AxmlReader: Unsupported tag: " + type);
  			}
  		}
  	}
  }
  