edu.umd.cs.findbugs.detect.LpUtil.java Source code

Introduction

Here is the source code for edu.umd.cs.findbugs.detect.LpUtil.java

Source

/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2003-2008 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 java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.List;

import org.apache.bcel.Constants;
import org.apache.commons.lang.StringUtils;

import edu.umd.cs.findbugs.charsets.UTF8;

/**
 * @author wuhui
 */
public class LpUtil implements Constants {

    public static boolean isBlank(String str) {
        if ("null".equals(str)) {
            return true;
        }
        return StringUtils.isBlank(str);
    }

    /**
     * store
     */
    public static boolean isStoreA(int seen) {
        if (seen == ASTORE || (seen >= ASTORE_0 && seen <= ASTORE_3)) {
            return true;
        }
        return false;
    }

    /**
     * load
     */
    public static boolean isLoadA(int seen) {
        if (seen == ALOAD || (seen >= ALOAD_0 && seen <= ALOAD_3)) {
            return true;
        }
        return false;
    }

    private static final List<Short> mulOrDivList = Arrays.asList(IMUL, LMUL, FMUL, DMUL, IDIV, LDIV, FDIV, DDIV);

    /**
     *    
     */
    public static boolean isMulOrDiv(int seen) {
        return mulOrDivList.contains(Short.valueOf(String.valueOf(seen)));
    }

    public static boolean isStore(int seen) {
        if (seen >= ISTORE && seen <= SASTORE) {
            return true;
        }
        return false;
    }

    public static boolean isLoad(int seen) {
        if (seen >= ILOAD && seen <= SALOAD) {
            return true;
        }

        return false;
    }

    /**
     *    (:if { }) 
     * 
     * @param seen
     * @return
     */
    public static boolean haveBranchTarget(int seen) {
        if ((seen == GOTO) || (seen == GOTO_W) || (seen == IF_ACMPEQ) || (seen == IF_ACMPNE) || (seen == IF_ICMPEQ)
                || (seen == IF_ICMPGE) || (seen == IF_ICMPGT) || (seen == IF_ICMPLE) || (seen == IF_ICMPLT)
                || (seen == IF_ICMPNE) || (seen == IFEQ) || (seen == IFGE) || (seen == IFGT) || (seen == IFLE)
                || (seen == IFLT) || (seen == IFNE) || (seen == IFNONNULL) || (seen == IFNULL)) {
            return true;
        }
        return false;
    }

    public static void writerLog(Object... str) {
        BufferedWriter writer = null;
        try {
            writer = new BufferedWriter(
                    new OutputStreamWriter(new FileOutputStream(new File("d:\\123000.txt"), true), UTF8.charset));
            for (Object temp : str) {
                writer.write(String.valueOf(temp));
                writer.write("\r\n");
            }
        } catch (Exception e) {
        } finally {
            try {
                if (writer != null) {
                    writer.close();
                }
            } catch (IOException e) {
            }
        }
    }

}