/*******************************************************************************
 * Copyright (c) 2004, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*


 */
package org.eclipse.jem.internal.proxy.common;

import java.util.HashMap;
 

/**
 * This is used for mapping between JNI format and non-JNI format. It also has the
 * maps for primitives.
 * @since 1.0.0
 */
public class MapTypes {

	public final static HashMap MAP_SHORTSIG_TO_TYPE = new HashMap(8);
	public final static HashMap MAP_TYPENAME_TO_SHORTSIG = new HashMap(8);
	static {
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("B", Byte.TYPE); //$NON-NLS-1$
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("C", Character.TYPE); //$NON-NLS-1$
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("D", Double.TYPE);		 //$NON-NLS-1$
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("F", Float.TYPE); //$NON-NLS-1$
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("I", Integer.TYPE); //$NON-NLS-1$
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("J", Long.TYPE); //$NON-NLS-1$
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("S", Short.TYPE); //$NON-NLS-1$
		MapTypes.MAP_SHORTSIG_TO_TYPE.put("Z", Boolean.TYPE); //$NON-NLS-1$
		
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("byte","B"); //$NON-NLS-1$ //$NON-NLS-2$
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("char","C"); //$NON-NLS-1$ //$NON-NLS-2$
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("double","D"); //$NON-NLS-1$ //$NON-NLS-2$
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("float","F"); //$NON-NLS-1$ //$NON-NLS-2$
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("int","I"); //$NON-NLS-1$ //$NON-NLS-2$
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("long","J"); //$NON-NLS-1$ //$NON-NLS-2$
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("short","S"); //$NON-NLS-1$ //$NON-NLS-2$
		MapTypes.MAP_TYPENAME_TO_SHORTSIG.put("boolean","Z"); //$NON-NLS-1$ //$NON-NLS-2$
	}

	
	/**
	 * Convert formal type name for an array (i.e. java.lang.Object[]
	 * to the jni format (i.e. [Ljava.lang.Object;)
	 * This is used when a name is passed in from the IDE side.
	 * The VM side uses the jni format, and all of proxy uses the jni format.
	 * 
	 * @param classname
	 * @return string jni form of name.
	 * 
	 * @since 1.0.0
	 */
	public static String getJNIFormatName(String classname) {
		if (classname.length() == 0 || !classname.endsWith("]")) //$NON-NLS-1$
			return classname;	// Not an array,or invalid
		
		StringBuffer jni = new StringBuffer(classname.length());
		int firstOpenBracket = classname.indexOf('[');
		int ob = firstOpenBracket;
		while (ob > -1) {
			int cb = classname.indexOf(']', ob);
			if (cb == -1)
				break;
			jni.append('[');
			ob = classname.indexOf('[', cb);
		}
		
		String finalType = classname.substring(0, firstOpenBracket).trim();
		if (finalType != null) {
			String shortSig = (String) MapTypes.MAP_TYPENAME_TO_SHORTSIG.get(finalType);
			if (shortSig == null) {
				jni.append('L');
				jni.append(finalType);
				jni.append(';');
			} else {
				jni.append(shortSig);
			}
		}
		
		return jni.toString();
	}
	
	/**
	 * This converts from the JNI format to the formal typename.
	 * 
	 * @param jniName
	 * @return formal typename
	 * 
	 * @since 1.1.0
	 */
	public static String getFormalTypeName(String jniName) {
		if (jniName.charAt(0) == '[') {
			// It is an array
			int dims = jniName.lastIndexOf('[')+1;	// Number of dimensions
			int startType = dims;
			StringBuffer fName = new StringBuffer(jniName.length()+(2*dims)); 
			if (jniName.charAt(startType) == 'L')
				fName.append(jniName.substring(startType+1, jniName.length()-1));	// For "[Ljava.lang.String;" return "java.lang.String"
			else if (jniName.length() == startType+1) {
				// Possible primitive
				Class type = (Class) MAP_SHORTSIG_TO_TYPE.get(jniName.substring(startType, startType+1));
				if (type != null) {
					fName.append(type.getName());
				} else
					return "";	// Invalid if no 'L' and not a primitive. //$NON-NLS-1$
			} else
				return "";	// Invalid, must be either a primitive or 'L' type. //$NON-NLS-1$
			while(dims-- > 0) {
				fName.append("[]"); //$NON-NLS-1$
			}
			return fName.toString();
		} else if (jniName.length() == 1) {
			// Possible primitive.
			Class type = (Class) MAP_SHORTSIG_TO_TYPE.get(jniName);
			if (type != null) {
				return type.getName();
			}
		}
		
		// If got here then just a name as is.
		return jniName;
	}
	
	/**
	 * Convert the formal type name, with the given number of dimensions,
	 * to an array JNI type.
	 * @param finalComponent final component name, should not be an array type.
	 * @param dimensions number of dimensions for the array.
	 * @return
	 * 
	 * @since 1.1.0
	 */
	public static String getJNITypeName(String finalComponent, int dimensions) {
		StringBuffer jni = new StringBuffer(finalComponent.length()+dimensions+2);
		while (dimensions-- > 0) {
			jni.append('[');
		}
		
		String shortSig = (String) MapTypes.MAP_TYPENAME_TO_SHORTSIG.get(finalComponent);
		if (shortSig == null) {
			jni.append('L');
			jni.append(finalComponent);
			jni.append(';');
		} else {
			jni.append(shortSig);
		}
		
		return jni.toString();
	}
}