typeconversionparser.java

java 调用windows的api

package org.jawin.browser.codegen;

import org.xml.sax.ext.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

import java.io.*;

import org.jawin.browser.config.ConfigManager;
import org.jawin.browser.log.Log;

/**
 * SAX parse out the type conversion config file
 *
 * <p>Title: Jawin Code Generation GUI</p>
 * <p>Description: GUI for exploring type libraries and generating Java code</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: Open Source Incentive</p>
 *
 * @author Josh Passenger
 * @version 1.0
 */

public class TypeConversionParser extends DefaultHandler
{
	/**
	 * The Sax parser class to use
	 */
	private String parserName = ConfigManager.getInstance().getString("sax.parser", "org.apache.xerces.parsers.SAXParser");

	/**
	 * The parser that will actually pasre the document
	 */
	private XMLReader xmlReader = null;

	/**
	 * The current config item
	 */
	private TypeConversionConfig currentConfig = null;


	public TypeConversionParser()
	{
		try
		{
			xmlReader = XMLReaderFactory.createXMLReader(parserName);
			xmlReader.setContentHandler(this);
		}
		catch (Exception e)
		{
			Log.getInstance().exception("TypeConversionParser() failed to create SAX parser, no type conversion config is available", e);
		}
	}

	/**
	 * @todo implement config file parsing and throw SaxException
	 *
	 * @param typeConversionConfigFile
	 */
	public void parseCodeGenConfig(String typeConversionConfigFile)
	{
		FileInputStream fileIn = null;

		try
		{
			fileIn = new FileInputStream(typeConversionConfigFile);
			InputSource in = new InputSource(fileIn);
			xmlReader.parse(in);
		}
		catch (Exception e)
		{
			Log.getInstance().exception("TypeConversionParser.parseTypeConversionConfig() failed to parse type conversion config file: " + typeConversionConfigFile, e);
		}
		finally
		{
			if (fileIn != null)
			{
				try
				{
					fileIn.close();
				}
				catch (Exception e)
				{

				}
			}
		}
	}

	/**
	 * Fired when the start of a doucment is encountered
	 *
	 * @throws SAXException thrown if something goes wrong
	 */
	public void startDocument() throws SAXException
	{
		TypeConversionManager.getInstance().clearConfig();
		currentConfig = null;
	}

	/**
	 * Fired when an element is started
	 *
	 * @param uri
	 * @param localName
	 * @param qualifiedName
	 * @param attributes
	 * @throws SAXException
	 */
	public void startElement(String uri, String localName, String qualifiedName, Attributes attributes) throws SAXException
	{
		if (qualifiedName.equals("typeLibraryType"))
		{
			String id = getAttribute("id", attributes);
			String string = getAttribute("string", attributes);
			String pointer = getAttribute("pointer", attributes);
			currentConfig = new TypeConversionConfig(id, string, pointer);
			TypeConversionManager.getInstance().addTypeConversionConfig(currentConfig);
			return;
		}

		if (qualifiedName.equals("javaType"))
		{
			String string = getAttribute("string", attributes);
			String objectType = getAttribute("objectType", attributes);
			String signature = getAttribute("signature", attributes);
			String nativeString = getAttribute("nativeString", attributes);
			String nativeArray = getAttribute("nativeArray", attributes);
			JavaType javaType = new JavaType(string, objectType, signature, nativeString, nativeArray);

			if (currentConfig != null)
			{
				currentConfig.setJavaType(javaType);
			}
			return;
		}

		if (qualifiedName.equals("cppType"))
		{
			String string = getAttribute("string", attributes);
			String direct = getAttribute("direct", attributes);
			String pointer = getAttribute("pointer", attributes);
			CPlusPlusType cppType = new CPlusPlusType(string, direct, pointer);

			if (currentConfig != null)
			{
				currentConfig.setCPlusPlusType(cppType);
			}
			return;
		}

	}

	/**
	 * Fetches the value of a required attribute, some attributes may be empty Strings
	 * but all shoudl be specified in the config file
	 *
	 * @param name the name of the attribute to fetch
	 * @param attributes the attributes on the node
	 * @return the value of the named attribute
	 * @throws SAXException thrown if the attribute does not exist
	 */
	private String getAttribute(String name, Attributes attributes) throws SAXException
	{
		String value = attributes.getValue(name);

		if (value == null)
		{
			throw new SAXException("TypeConversionParser.getAttribute() a required attribute was missing: " + name);
		}

		return value;
	}

}