RecentCases.java

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/*
 * Autopsy Forensic Browser
 *
 * Copyright 2011-2018 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sleuthkit.autopsy.casemodule;
 
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Deque;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;
import javax.swing.JMenuItem;
import org.apache.commons.lang.ArrayUtils;
import org.openide.filesystems.FileUtil;
import org.openide.util.HelpCtx;
import org.openide.util.NbBundle;
import org.openide.util.actions.CallableSystemAction;
import org.openide.util.actions.Presenter;
import org.sleuthkit.autopsy.coreutils.Logger;
import org.sleuthkit.autopsy.coreutils.ModuleSettings;

final class RecentCases extends CallableSystemAction implements Presenter.Menu {
 
    private static final long serialVersionUID = 1L;
    private static final int LENGTH = 6;
    private static final String NAME_PROP_KEY = "LBL_RecentCase_Name"; //NON-NLS
    private static final String PATH_PROP_KEY = "LBL_RecentCase_Path"; //NON-NLS
    private static final RecentCase BLANK_RECENTCASE = new RecentCase("", "");
    private final static RecentCases instance = new RecentCases();
    private final Deque<RecentCase> recentCases; // newest case is last case

    static public RecentCases getInstance() {
        instance.refreshRecentCases();
        return instance;
    }

    private RecentCases() {
 
        for (int i = 0; i < LENGTH; i++) {
            try {
                if (ModuleSettings.getConfigSetting(ModuleSettings.MAIN_SETTINGS, nameKey(i)) == null) {
                    ModuleSettings.setConfigSetting(ModuleSettings.MAIN_SETTINGS, nameKey(i), "");
                }
                if (ModuleSettings.getConfigSetting(ModuleSettings.MAIN_SETTINGS, pathKey(i)) == null) {
                    ModuleSettings.setConfigSetting(ModuleSettings.MAIN_SETTINGS, pathKey(i), "");
                }
            } catch (Exception e) {
 
            }
        }
 
        // Load recentCases from properties
        recentCases = new LinkedList<>();
 
        for (int i = 0; i < LENGTH; i++) {
            final RecentCase rc = new RecentCase(getName(i), getPath(i));
            if (!rc.equals(BLANK_RECENTCASE)) {
                recentCases.add(rc);
            }
        }
 
        refreshRecentCases();
    }
 
    private static void validateCaseIndex(int i) {
        if (i < 0 || i >= LENGTH) {
            throw new IllegalArgumentException(
                    NbBundle.getMessage(RecentCases.class, "RecentCases.exception.caseIdxOutOfRange.msg", i));
        }
    }
 
    private static String nameKey(int i) {
        validateCaseIndex(i);
        return NAME_PROP_KEY + Integer.toString(i + 1);
    }
 
    private static String pathKey(int i) {
        validateCaseIndex(i);
        return PATH_PROP_KEY + Integer.toString(i + 1);
    }
 
    private String getName(int i) {
        try {
            return ModuleSettings.getConfigSetting(ModuleSettings.MAIN_SETTINGS, nameKey(i));
        } catch (Exception e) {
            return null;
        }
    }
 
    private String getPath(int i) {
        try {
            return ModuleSettings.getConfigSetting(ModuleSettings.MAIN_SETTINGS, pathKey(i));
        } catch (Exception e) {
            return null;
        }
    }
 
    private void setName(int i, String name) {
        ModuleSettings.setConfigSetting(ModuleSettings.MAIN_SETTINGS, nameKey(i), name);
    }
 
    private void setPath(int i, String path) {
        ModuleSettings.setConfigSetting(ModuleSettings.MAIN_SETTINGS, pathKey(i), path);
    }
 
    private void setRecentCase(int i, RecentCase rc) {
        setName(i, rc.name);
        setPath(i, rc.path);
    }
 
    private static final class RecentCase {
 
        String name, path;

        private RecentCase(String name, String path) {
            this.name = name;
            this.path = path;
        }

        static RecentCase createSafe(String name, String unsafePath) {
            return new RecentCase(name, FileUtil.normalizePath(unsafePath));
        }

        boolean exists() {
            return !(name.isEmpty() || path.isEmpty() || !new File(path).exists());
        }
 
        // netbeans autogenerated hashCode
        @Override
        public int hashCode() {
            int hash = 7;
            hash = 13 * hash + (this.name != null ? this.name.hashCode() : 0);
            hash = 13 * hash + (this.path != null ? this.path.hashCode() : 0);
            return hash;
        }
 
        @Override
        public boolean equals(Object obj) {
            if (obj == null) {
                return false;
            }
            if (getClass() != obj.getClass()) {
                return false;
            }
            final RecentCase other = (RecentCase) obj;
            if ((this.name == null) ? (other.name != null) : !this.name.equals(other.name)) {
                return false;
            }
            if ((this.path == null) ? (other.path != null) : !this.path.equals(other.path)) {
                return false;
            }
            return true;
        }
    }

    private void refreshRecentCases() {
        List<RecentCase> toDelete = new ArrayList<>();
        for (RecentCase rc : recentCases) {
            if (!rc.exists()) {
                toDelete.add(rc);
            }
        }
        for (RecentCase deleteMe : toDelete) {
            removeRecentCase(deleteMe.name, deleteMe.path);
        }
    }
 
    private void storeRecentCases() throws IOException {
        int i = 0;
 
        // store however many recent cases exist
        for (RecentCase rc : recentCases) {
            setRecentCase(i, rc);
            i++;
        }
 
        // set the rest to blanks
        while (i < LENGTH) {
            setRecentCase(i, BLANK_RECENTCASE);
            i++;
        }
 
    }

    @Override
    public JMenuItem getMenuPresenter() {
        return new UpdateRecentCases();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        UpdateRecentCases.setHasRecentCase(false);
 
        recentCases.clear();
 
        try {
            // clear the properties file
            storeRecentCases();
        } catch (IOException ex) {
            Logger.getLogger(RecentCases.class.getName()).log(Level.WARNING, "Error: Could not clear the properties file.", ex); //NON-NLS
        }
    }
 
    private void addRecentCase(RecentCase rc) {
        // remove the case if it's already in the list
        recentCases.remove(rc);
 
        // make space if it's needed
        if (recentCases.size() == LENGTH) {
            recentCases.remove();
        }
 
        recentCases.add(rc);
    }

    public void addRecentCase(String name, String unsafePath) {
        RecentCase rc = RecentCase.createSafe(name, unsafePath);
 
        addRecentCase(rc);
 
        this.getMenuPresenter().setVisible(true); // invoke the contructor again
 
        try {
            storeRecentCases();
        } catch (IOException ex) {
            Logger.getLogger(RecentCases.class.getName()).log(Level.WARNING, "Error: Could not update the properties file.", ex); //NON-NLS
        }
    }

    public void updateRecentCase(String oldName, String oldPath, String newName, String newPath) throws Exception {
        RecentCase oldRc = RecentCase.createSafe(oldName, oldPath);
        RecentCase newRc = RecentCase.createSafe(newName, newPath);
 
        // remove all instances of the old recent case
        recentCases.removeAll(Arrays.asList(oldRc));
 
        addRecentCase(newRc);
 
        this.getMenuPresenter().setVisible(true); // invoke the contructor again
 
        try {
            storeRecentCases();
        } catch (IOException ex) {
            Logger.getLogger(RecentCases.class.getName()).log(Level.WARNING, "Error: Could not update the properties file.", ex); //NON-NLS
        }
    }

    public int getTotalRecentCases() {
        return recentCases.size();
    }

    public void removeRecentCase(String name, String path) {
        RecentCase rc = RecentCase.createSafe(name, path);
 
        // remove all instances of the old recent case
        recentCases.removeAll(Arrays.asList(rc));
 
        this.getMenuPresenter().setVisible(true); // invoke the contructor again
 
        // write the properties file
        try {
            storeRecentCases();
        } catch (IOException ex) {
            Logger.getLogger(RecentCases.class.getName()).log(Level.WARNING, "Error: Could not update the properties file.", ex); //NON-NLS
        }
    }

    public String[] getRecentCaseNames() {
        String[] caseNames = new String[LENGTH];
 
        Iterator<RecentCase> mostRecentFirst = recentCases.descendingIterator();
        int i = 0;
        String currentCaseName = null;
        try {
            currentCaseName = Case.getCurrentCaseThrows().getDisplayName();
        } catch (NoCurrentCaseException ex) {
            // in case there is no current case.
        }
 
        while (mostRecentFirst.hasNext()) {
            String name = mostRecentFirst.next().name;
            if ((currentCaseName != null && !name.equals(currentCaseName)) || currentCaseName == null) {
                // exclude currentCaseName from the caseNames[]
                caseNames[i] = name;
                i++;
            }
        }
 
        while (i < caseNames.length) {
            caseNames[i] = "";
            i++;
        }
 
        // return last 5 case names
        return (String[]) ArrayUtils.subarray(caseNames, 0, LENGTH - 1);
    }

    public String[] getRecentCasePaths() {
        String[] casePaths = new String[LENGTH];
        String currentCasePath = null;
        try {
            currentCasePath = Case.getCurrentCaseThrows().getMetadata().getFilePath().toString();
        } catch (NoCurrentCaseException ex) {
            /*
             * There may be no current case.
             */
        }
 
        Iterator<RecentCase> mostRecentFirst = recentCases.descendingIterator();
        int i = 0;
        while (mostRecentFirst.hasNext()) {
            String path = mostRecentFirst.next().path;
            if ((currentCasePath != null && !path.equals(currentCasePath)) || currentCasePath == null) {
                // exclude currentCasePath from the casePaths[]
                casePaths[i] = path;
                i++;
            }
        }
 
        while (i < casePaths.length) {
            casePaths[i] = "";
            i++;
        }
 
        // return last 5 case paths
        return (String[]) ArrayUtils.subarray(casePaths, 0, LENGTH - 1);
    }

    @Override
    public void performAction() {
    }

    @Override
    public String getName() {
        //return NbBundle.getMessage(RecentCases.class, "CTL_RecentCases");
        return NbBundle.getMessage(RecentCases.class, "RecentCases.getName.text");
    }

    @Override
    public HelpCtx getHelpCtx() {
        return HelpCtx.DEFAULT_HELP;
    }
}