/***
 * 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 alterrs.asm.AnnotationVisitor;
import alterrs.asm.Attribute;
import alterrs.asm.ClassVisitor;
import alterrs.asm.FieldVisitor;
import alterrs.asm.MethodVisitor;
import alterrs.asm.Opcodes;
import alterrs.asm.commons.Remapper;
import alterrs.asm.commons.RemappingClassAdapter;

/**
 * A {@link alterrs.asm.ClassAdapter} that renames fields and methods, and
 * removes debug info.
 * 
 * @author Eric Bruneton
 * @author Eugene Kuleshov
 */
public class ClassOptimizer extends RemappingClassAdapter {

	private String pkgName;

	public ClassOptimizer(final ClassVisitor cv, final Remapper remapper) {
		super(cv, remapper);
	}

	// ------------------------------------------------------------------------
	// Overridden methods
	// ------------------------------------------------------------------------

	public void visit(final int version, final int access, final String name,
			final String signature, final String superName,
			final String[] interfaces) {
		super.visit(version, access, name, null, superName, interfaces);
		pkgName = name.substring(0, name.lastIndexOf('/'));
	}

	public void visitSource(final String source, final String debug) {
		// remove debug info
	}

	public void visitOuterClass(final String owner, final String name,
			final String desc) {
		// remove debug info
	}

	public AnnotationVisitor visitAnnotation(final String desc,
			final boolean visible) {
		// remove annotations
		return null;
	}

	public void visitAttribute(final Attribute attr) {
		// remove non standard attributes
	}

	public void visitInnerClass(final String name, final String outerName,
			final String innerName, final int access) {
		// remove debug info
	}

	public FieldVisitor visitField(final int access, final String name,
			final String desc, final String signature, final Object value) {
		String s = remapper.mapFieldName(className, name, desc);
		if ("-".equals(s)) {
			return null;
		}
		if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
			if ((access & Opcodes.ACC_FINAL) != 0
					&& (access & Opcodes.ACC_STATIC) != 0 && desc.length() == 1) {
				return null;
			}
			if ("org/objectweb/asm".equals(pkgName) && s.equals(name)) {
				System.out.println("INFO: " + s + " could be renamed");
			}
			super.visitField(access, name, desc, null, value);
		} else {
			if (!s.equals(name)) {
				throw new RuntimeException("The public or protected field "
						+ className + '.' + name + " must not be renamed.");
			}
			super.visitField(access, name, desc, null, value);
		}
		return null; // remove debug info
	}

	public MethodVisitor visitMethod(final int access, final String name,
			final String desc, final String signature, final String[] exceptions) {
		String s = remapper.mapMethodName(className, name, desc);
		if ("-".equals(s)) {
			return null;
		}
		if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
			if ("org/objectweb/asm".equals(pkgName) && !name.startsWith("<")
					&& s.equals(name)) {
				System.out.println("INFO: " + s + " could be renamed");
			}
			return super.visitMethod(access, name, desc, null, exceptions);
		} else {
			if (!s.equals(name)) {
				throw new RuntimeException("The public or protected method "
						+ className + '.' + name + desc
						+ " must not be renamed.");
			}
			return super.visitMethod(access, name, desc, null, exceptions);
		}
	}

	protected MethodVisitor createRemappingMethodAdapter(int access,
			String newDesc, MethodVisitor mv) {
		return new MethodOptimizer(access, newDesc, mv, remapper);
	}
}
