Initial code commit.

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>classversion-scanner</name>
+	<comment/>
+	<projects/>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments/>
+		</buildCommand>
+	</buildSpec>
+	<linkedResources/>
+</projectDescription>

build.gradle

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+
+apply plugin: 'java'
+apply plugin: 'eclipse'
+apply plugin: 'application'
+
+mainClassName = "com.netmikey.cvscanner.ClassVersionScanner"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile (group: 'commons-cli', name: 'commons-cli', version: '1.2')
+}

src/main/java/com/netmikey/cvscanner/ClassVersionScanner.java

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+package com.netmikey.cvscanner;
+
+import java.io.File;
+import java.util.logging.Level;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.CommandLineParser;
+import org.apache.commons.cli.HelpFormatter;
+import org.apache.commons.cli.Options;
+import org.apache.commons.cli.PosixParser;
+
+/**
+ * Main class for running the Class Version Scanner.
+ * 
+ * @author netmikey
+ */
+public class ClassVersionScanner {
+    /**
+     * Main method.
+     * 
+     * @param argv
+     *            Command-Line arguments.
+     * @throws Exception
+     *             Something went horribly wrong.
+     */
+    public static void main(String[] argv) throws Exception {
+        // Command line stuff...
+        Options opt = new Options();
+        opt.addOption("d", "dir", true, "the root directory from which to search for class files and java archives "
+            + "(if not set, the current working directory will be used).");
+        opt.addOption("n", "newer", true, "only look for class files compiled for the specified JRE and newer");
+        opt.addOption("o", "older", true, "only look for class files compiled for the specified JRE and older");
+        // I know java logging can be configured in an "awesome" *cough* way,
+        // but srsly, nobody wants to do that for a little command line tool
+        // like this...
+        opt.addOption("v", "verbose", false, "display more processing info");
+        opt.addOption("h", "help", false, "display this help info");
+
+        CommandLineParser parser = new PosixParser();
+        CommandLine cmd = parser.parse(opt, argv);
+
+        if (cmd.hasOption("help")) {
+            HelpFormatter formatter = new HelpFormatter();
+            formatter.printHelp(ClassVersionScanner.class.getName(), opt);
+            return;
+        }
+
+        Scanner scanner = new Scanner();
+        File baseDir = new File(cmd.hasOption("dir") ? cmd.getOptionValue("dir") : System.getProperty("user.dir"));
+        scanner.setMinVersion(Scanner.VERSIONS.get(cmd.getOptionValue("newer")));
+        scanner.setMaxVersion(Scanner.VERSIONS.get(cmd.getOptionValue("older")));
+        if (cmd.hasOption("verbose")) {
+            scanner.setFineLevel(Level.INFO);
+        }
+        scanner.scanForVersion(baseDir);
+    }
+}

src/main/java/com/netmikey/cvscanner/JavaVersion.java

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+package com.netmikey.cvscanner;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Wraps the required metadata of a java version/release.
+ * 
+ * @author netmikey
+ */
+public class JavaVersion {
+    private int version;
+
+    private List<String> aliases;
+
+    private long classFileVersion;
+
+    /**
+     * Default constructor.
+     * 
+     * @param version
+     *            The numeric value of the java version.
+     * @param classFileVersion
+     *            The class file version that corresponds to this java version.
+     * @param aliases
+     *            A list of aliases that match this version.
+     */
+    public JavaVersion(int version, long classFileVersion, String... aliases) {
+        this.version = version;
+        this.classFileVersion = classFileVersion;
+        this.aliases = Arrays.asList(aliases);
+    }
+
+    /**
+     * Get the version.
+     * 
+     * @return Returns the version.
+     */
+    public int getVersion() {
+        return version;
+    }
+
+    /**
+     * Get the aliases.
+     * 
+     * @return Returns the aliases.
+     */
+    public List<String> getAliases() {
+        return aliases;
+    }
+
+    /**
+     * Get the classFileVersion.
+     * 
+     * @return Returns the classFileVersion.
+     */
+    public long getClassFileVersion() {
+        return classFileVersion;
+    }
+
+}