/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2003-2007 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.classfile.engine;

import java.util.LinkedList;
import java.util.List;
import java.util.TreeSet;

import javax.annotation.CheckForNull;

import org.apache.bcel.classfile.ConstantClass;
import org.apache.bcel.classfile.ConstantNameAndType;
import org.apache.bcel.classfile.Field;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;

import edu.umd.cs.findbugs.classfile.ClassDescriptor;
import edu.umd.cs.findbugs.classfile.DescriptorFactory;
import edu.umd.cs.findbugs.classfile.FieldDescriptor;
import edu.umd.cs.findbugs.classfile.ICodeBaseEntry;
import edu.umd.cs.findbugs.classfile.InvalidClassFileFormatException;
import edu.umd.cs.findbugs.classfile.MethodDescriptor;
import edu.umd.cs.findbugs.classfile.analysis.ClassInfo;
import edu.umd.cs.findbugs.classfile.analysis.ClassNameAndSuperclassInfo;
import edu.umd.cs.findbugs.internalAnnotations.SlashedClassName;
import edu.umd.cs.findbugs.util.ClassName;
import edu.umd.cs.findbugs.visitclass.AnnotationVisitor;

/**
 * @author William Pugh
 */
@Deprecated
public class ClassParserUsingBCEL implements ClassParserInterface {

    private final JavaClass javaClass;

    private final String slashedClassName;

    private final ClassDescriptor expectedClassDescriptor;

    private final ICodeBaseEntry codeBaseEntry;

    public ClassParserUsingBCEL(JavaClass javaClass, @CheckForNull ClassDescriptor expectedClassDescriptor,
            ICodeBaseEntry codeBaseEntry) {
        this.javaClass = javaClass;
        this.slashedClassName = javaClass.getClassName().replace('.', '/');
        this.expectedClassDescriptor = expectedClassDescriptor;
        this.codeBaseEntry = codeBaseEntry;

    }

    /*
     * (non-Javadoc)
     *
     * @see
     * edu.umd.cs.findbugs.classfile.engine.ClassParserInterface#parse(edu.umd
     * .cs.findbugs.classfile.analysis.ClassNameAndSuperclassInfo.Builder)
     */
    @Override
    public void parse(final ClassNameAndSuperclassInfo.Builder builder) throws InvalidClassFileFormatException {

        builder.setCodeBaseEntry(codeBaseEntry);
        builder.setAccessFlags(javaClass.getAccessFlags());
        ClassDescriptor classDescriptor = DescriptorFactory.createClassDescriptorFromDottedClassName(javaClass.getClassName());
        if (expectedClassDescriptor != null && expectedClassDescriptor.equals(classDescriptor)) {
            throw new InvalidClassFileFormatException("Expected " + expectedClassDescriptor, classDescriptor, codeBaseEntry);
        }
        builder.setClassDescriptor(classDescriptor);

        builder.setSuperclassDescriptor(DescriptorFactory.createClassDescriptorFromDottedClassName(javaClass.getSuperclassName()));
        String[] allInterfaces = javaClass.getInterfaceNames();
        ClassDescriptor[] allInterfaceDescriptiors;
        if (allInterfaces.length == 0) {
            allInterfaceDescriptiors = ClassDescriptor.EMPTY_ARRAY;
        } else {
            allInterfaceDescriptiors = new ClassDescriptor[allInterfaces.length];
            for (int i = 0; i < allInterfaces.length; i++) {
                allInterfaceDescriptiors[i] = DescriptorFactory.createClassDescriptorFromDottedClassName(allInterfaces[i]);
            }
        }
        builder.setInterfaceDescriptorList(allInterfaceDescriptiors);
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * edu.umd.cs.findbugs.classfile.engine.ClassParserInterface#parse(edu.umd
     * .cs.findbugs.classfile.analysis.ClassInfo.Builder)
     */
    @Override
    public void parse(ClassInfo.Builder builder) throws InvalidClassFileFormatException {
        parse((ClassNameAndSuperclassInfo.Builder) builder);

        final List<FieldDescriptor> fieldDescriptorList = new LinkedList<FieldDescriptor>();
        final List<MethodDescriptor> methodDescriptorList = new LinkedList<MethodDescriptor>();
        final TreeSet<ClassDescriptor> referencedClassSet = new TreeSet<ClassDescriptor>();
        javaClass.accept(new AnnotationVisitor() {
            @Override
            public void visit(Method obj) {
                methodDescriptorList.add(parseMethod(obj));
            }

            @Override
            public void visit(Field obj) {
                fieldDescriptorList.add(parseField(obj));
            }

            @Override
            public void visit(ConstantClass obj) {
                @SlashedClassName
                String className = obj.getBytes(javaClass.getConstantPool());
                if (className.indexOf('[') >= 0) {
                    ClassParser.extractReferencedClassesFromSignature(referencedClassSet, className);
                } else if (ClassName.isValidClassName(className)) {
                    referencedClassSet.add(DescriptorFactory.instance().getClassDescriptor(className));
                }
            }

            @Override
            public void visit(ConstantNameAndType obj) {
                String signature = obj.getSignature(javaClass.getConstantPool());
                ClassParser.extractReferencedClassesFromSignature(referencedClassSet, signature);
            }
        });

    }

    /**
     * @param obj
     *            the field to parse
     * @return a descriptor for the field
     */
    protected FieldDescriptor parseField(Field obj) {
        return new FieldDescriptor(slashedClassName, obj.getName(), obj.getSignature(), obj.isStatic());
    }

    /**
     * @param obj
     *            the method to parse
     * @return a descriptor for the method
     */
    protected MethodDescriptor parseMethod(Method obj) {
        return new MethodDescriptor(slashedClassName, obj.getName(), obj.getSignature(), obj.isStatic());
    }

}
