/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2007 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package alterrs.asm.optimizer;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;

import alterrs.asm.Type;

/**
 * A MAPPING from names to names, used to rename classes, fields and methods.
 * 
 * @author Eric Bruneton
 */
public class NameMapping extends Properties {

	public final Set unused;

	public NameMapping(final String file) throws IOException {
		InputStream is = null;
		try {
			is = new BufferedInputStream(new FileInputStream(file));
			load(is);
			unused = new HashSet(keySet());
		} finally {
			if (is != null) {
				is.close();
			}
		}
	}

	public String map(final String name) {
		String s = (String) get(name);
		if (s == null) {
			int p = name.indexOf('.');
			if (p == -1) {
				s = name;
			} else {
				int q = name.indexOf('(');
				if (q == -1) {
					s = name.substring(p + 1);
				} else {
					s = name.substring(p + 1, q);
				}
			}
		} else {
			unused.remove(name);
		}
		return s;
	}

	public String fix(final String desc) {
		if (desc.startsWith("(")) {
			Type[] arguments = Type.getArgumentTypes(desc);
			Type result = Type.getReturnType(desc);
			for (int i = 0; i < arguments.length; ++i) {
				arguments[i] = fix(arguments[i]);
			}
			result = fix(result);
			return Type.getMethodDescriptor(result, arguments);
		} else {
			return fix(Type.getType(desc)).getDescriptor();
		}
	}

	private Type fix(final Type t) {
		if (t.getSort() == Type.OBJECT) {
			return Type.getObjectType(map(t.getInternalName()));
		} else if (t.getSort() == Type.ARRAY) {
			String s = fix(t.getElementType()).getDescriptor();
			for (int i = 0; i < t.getDimensions(); ++i) {
				s = '[' + s;
			}
			return Type.getType(s);
		} else {
			return t;
		}
	}
}
