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/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2004-2006 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.detect;

import javax.annotation.OverridingMethodsMustInvokeSuper;

import org.apache.bcel.Const;
import org.apache.bcel.classfile.Code;

import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.Lookup;
import edu.umd.cs.findbugs.ba.XMethod;
import edu.umd.cs.findbugs.bcel.OpcodeStackDetector;
import edu.umd.cs.findbugs.classfile.ClassDescriptor;
import edu.umd.cs.findbugs.classfile.DescriptorFactory;
import edu.umd.cs.findbugs.classfile.analysis.AnnotationValue;

public class OverridingMethodsMustInvokeSuperDetector extends OpcodeStackDetector {

    private final BugReporter bugReporter;

    ClassDescriptor mustOverrideAnnotation = DescriptorFactory.createClassDescriptor(OverridingMethodsMustInvokeSuper.class);

    public OverridingMethodsMustInvokeSuperDetector(BugReporter bugReporter) {
        this.bugReporter = bugReporter;
    }

    private boolean sawCallToSuper;

    @Override
    public void visit(Code code) {
        if (getMethod().isStatic() || getMethod().isPrivate() || getMethod().isSynthetic()) {
            return;
        }

        XMethod overrides = Lookup.findSuperImplementorAsXMethod(getThisClass(), getMethodName(), getEffectiveMethodSig(), bugReporter);

        if (overrides == null) {
            return;
        }

        AnnotationValue annotation = overrides.getAnnotation(mustOverrideAnnotation);

        if (annotation == null) {
            return;
        }

        sawCallToSuper = false;
        super.visit(code);

        if (!sawCallToSuper) {
            bugReporter.reportBug(new BugInstance(this, "OVERRIDING_METHODS_MUST_INVOKE_SUPER", NORMAL_PRIORITY)
                    .addClassAndMethod(this).addString("Method must invoke override method in superclass"));
        }
    }

    private String getEffectiveMethodSig() {
        final String methodSig;
        XMethod bridgeFrom = getXMethod().bridgeFrom();

        if (bridgeFrom == null) {
            methodSig = getMethodSig();
        } else {
            methodSig = bridgeFrom.getSignature();
        }

        return methodSig;
    }

    /*
     * (non-Javadoc)
     *
     * @see edu.umd.cs.findbugs.bcel.OpcodeStackDetector#sawOpcode(int)
     */
    @Override
    public void sawOpcode(int seen) {
        if (seen != Const.INVOKESPECIAL) {
            return;
        }

        String calledClassName = getClassConstantOperand();
        String calledMethodName = getNameConstantOperand();
        String calledMethodSig = getSigConstantOperand();

        if (calledClassName.equals(getSuperclassName()) && calledMethodName.equals(getMethodName())
                && calledMethodSig.equals(getEffectiveMethodSig())) {
            sawCallToSuper = true;
        }
    }
}