1 files changed, 91 insertions, 0 deletions
diff --git a/configgen/src/main/java/com/yahoo/config/codegen/MakeConfigProperties.java b/configgen/src/main/java/com/yahoo/config/codegen/MakeConfigProperties.java
new file mode 100644
index 00000000000..d055a1fe1fb
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+++ b/configgen/src/main/java/com/yahoo/config/codegen/MakeConfigProperties.java
@@ -0,0 +1,91 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.config.codegen;
+
+import java.io.File;
+import java.util.Arrays;
+import java.util.List;
+import java.util.StringTokenizer;
+
+/**
+ * Encapsulates data extracted from system properties.
+ *
+ * @author <a href="gv@yahoo-inc.com">Gjoran Voldengen</a>
+ */
+public class MakeConfigProperties {
+
+    private final List<String> legalLanguages = Arrays.asList("java", "cpp", "cppng" );
+
+    final File destDir;
+    final File[] specFiles;
+    final String language;
+    final String dirInRoot; // Where within fileroot to store generated class files
+    final boolean dumpTree;
+    final boolean generateFrameworkCode;
+
+    MakeConfigProperties() throws PropertyException {
+        destDir = checkDestinationDir();
+        specFiles = checkSpecificationFiles();
+        language = checkLanguage();
+        dirInRoot = checkDirInRoot();
+        dumpTree = System.getProperty("config.dumpTree") != null &&
+                   System.getProperty("config.dumpTree").equalsIgnoreCase("true");
+        generateFrameworkCode = System.getProperty("config.useFramework") == null ||
+                                System.getProperty("config.useFramework").equalsIgnoreCase("true");
+    }
+
+    private File checkDestinationDir() throws PropertyException {
+        String destination = System.getProperty("config.dest");
+        if (destination == null)
+            throw new PropertyException("Missing property: config.dest.");
+
+        File dir = new File(destination);
+        if (!dir.isDirectory()) {
+            throw new PropertyException("Could not find directory: " + dir.getPath());
+        }
+        return dir;
+    }
+
+    private String checkDirInRoot() throws PropertyException {
+        String dirInRoot = System.getProperty("config.subdir");
+            // Optional parameter
+        if (dirInRoot == null) { return null; }
+        File f = new File(destDir, dirInRoot);
+        if (!f.isDirectory()) {
+            throw new PropertyException("Could not find directory: " + f.getPath());
+        }
+        return dirInRoot;
+    }
+
+    /**
+     * @return Desired programming language of generated code, default is "java".
+     * @throws PropertyException if supplied language is not a legal language.
+     */
+    private String checkLanguage() throws PropertyException {
+        String inputLang = System.getProperty("config.lang", "java").toLowerCase();
+        if (! legalLanguages.contains(inputLang)) {
+            throw new PropertyException
+                    ("Unsupported code language: '" + inputLang + "'. Supported languages are: " + legalLanguages);
+        }
+        return inputLang;
+    }
+
+    private static File[] checkSpecificationFiles() throws PropertyException {
+        String string = System.getProperty("config.spec");
+        if (string == null)
+            throw new PropertyException("Missing property: config.spec.");
+
+        StringTokenizer st = new StringTokenizer(string, ",");
+        if (st.countTokens() == 0)
+            throw new PropertyException("Missing property: config.spec.");
+
+        File[] files = new File[st.countTokens()];
+        for (int i = 0; st.hasMoreElements(); i++) {
+            files[i] = new File((String) st.nextElement());
+            if (!files[i].isFile())
+                throw new PropertyException("Could not read file " + files[i].getPath());
+        }
+        return files;
+    }
+
+}
+