initial version of Callable Download Task - used to make the downloads multi-threaded

Former-commit-id: f3f7e880e1fabece990d2ed14bd459a3ffe8c955

dependency-check-core/src/main/java/org/owasp/dependencycheck/data/update/CallableDownloadTask.java

@@ -0,0 +1,206 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.owasp.dependencycheck.data.update;
+
+import java.io.File;
+import java.net.URL;
+import java.util.concurrent.Callable;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.owasp.dependencycheck.utils.DownloadFailedException;
+import org.owasp.dependencycheck.utils.Downloader;
+
+/**
+ * A callable object to download two files.
+ *
+ * @author Jeremy Long (jeremy.long@owasp.org)
+ */
+public class CallableDownloadTask implements Callable<CallableDownloadTask> {
+
+    /**
+     * Simple constructor for the callable download task.
+     *
+     * @param nvdCveInfo the nvd cve info
+     * @param first the first file
+     * @param second the second file
+     */
+    public CallableDownloadTask(NvdCveInfo nvdCveInfo, File first, File second) {
+        this.nvdCveInfo = nvdCveInfo;
+        this.first = first;
+        this.second = second;
+    }
+    private NvdCveInfo nvdCveInfo;
+
+    /**
+     * Get the value of nvdCveInfo
+     *
+     * @return the value of nvdCveInfo
+     */
+    public NvdCveInfo getNvdCveInfo() {
+        return nvdCveInfo;
+    }
+
+    /**
+     * Set the value of nvdCveInfo
+     *
+     * @param nvdCveInfo new value of nvdCveInfo
+     */
+    public void setNvdCveInfo(NvdCveInfo nvdCveInfo) {
+        this.nvdCveInfo = nvdCveInfo;
+    }
+    /**
+     * a file.
+     */
+    private File first;
+
+    /**
+     * Get the value of first.
+     *
+     * @return the value of first
+     */
+    public File getFirst() {
+        return first;
+    }
+
+    /**
+     * Set the value of first.
+     *
+     * @param first new value of first
+     */
+    public void setFirst(File first) {
+        this.first = first;
+    }
+    /**
+     * a file.
+     */
+    private File second;
+
+    /**
+     * Get the value of second.
+     *
+     * @return the value of second
+     */
+    public File getSecond() {
+        return second;
+    }
+
+    /**
+     * Set the value of second.
+     *
+     * @param second new value of second
+     */
+    public void setSecond(File second) {
+        this.second = second;
+    }
+    /**
+     * the first url.
+     */
+    private URL firstUrl;
+
+    /**
+     * Get the value of firstUrl.
+     *
+     * @return the value of firstUrl
+     */
+    public URL getFirstUrl() {
+        return firstUrl;
+    }
+
+    /**
+     * Set the value of firstUrl.
+     *
+     * @param firstUrl new value of firstUrl
+     */
+    public void setFirstUrl(URL firstUrl) {
+        this.firstUrl = firstUrl;
+    }
+    /**
+     * the second url.
+     */
+    private URL secondUrl;
+
+    /**
+     * Get the value of secondURL.
+     *
+     * @return the value of secondURL
+     */
+    public URL getSecondUrl() {
+        return secondUrl;
+    }
+
+    /**
+     * Set the value of secondUrl.
+     *
+     * @param secondURL new value of secondUrl
+     */
+    public void setSecondUrl(URL secondUrl) {
+        this.secondUrl = secondUrl;
+    }
+    /**
+     * A placeholder for an exception.
+     */
+    private Exception exception = null;
+
+    /**
+     * Get the value of exception.
+     *
+     * @return the value of exception
+     */
+    public Exception getException() {
+        return exception;
+    }
+
+    /**
+     * returns whether or not an exception occurred during download.
+     *
+     * @return whether or not an exception occurred during download
+     */
+    public boolean hasException() {
+        return exception != null;
+    }
+
+    @Override
+    public CallableDownloadTask call() throws Exception {
+        try {
+            final URL url_1 = new URL(nvdCveInfo.getUrl());
+            final URL url_2 = new URL(nvdCveInfo.getOldSchemaVersionUrl());
+            String msg = String.format("Download Started for NVD CVE - %s", nvdCveInfo.getId());
+            Logger.getLogger(CallableDownloadTask.class.getName()).log(Level.INFO, msg);
+            Downloader.fetchFile(url_1, first);
+            Downloader.fetchFile(url_2, second);
+            msg = String.format("Download Complete for NVD CVE - %s", nvdCveInfo.getId());
+            Logger.getLogger(CallableDownloadTask.class.getName()).log(Level.INFO, msg);
+        } catch (DownloadFailedException ex) {
+            this.exception = ex;
+        }
+        return this;
+    }
+
+    /**
+     * Attempts to delete the files that were downloaded.
+     */
+    public void cleanup() {
+        boolean deleted = false;
+        try {
+            if (first != null && first.exists()) {
+                deleted = first.delete();
+            }
+        } finally {
+            if (first != null && (first.exists() || !deleted)) {
+                first.deleteOnExit();
+            }
+        }
+        try {
+            deleted = false;
+            if (second != null && second.exists()) {
+                deleted = second.delete();
+            }
+        } finally {
+            if (second != null && (second.exists() || !deleted)) {
+                second.deleteOnExit();
+            }
+        }
+    }
+}