[LIB-9] Output of application results to console

[chesshog.git] / chesshog-core / src / main / java / org / hedgecode / chess / ChessHogProperties.java

diff --git a/chesshog-core/src/main/java/org/hedgecode/chess/ChessHogProperties.java b/chesshog-core/src/main/java/org/hedgecode/chess/ChessHogProperties.java
new file mode 100644 (file)
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+++ b/chesshog-core/src/main/java/org/hedgecode/chess/ChessHogProperties.java
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+/*
+ * Copyright (c) 2018-2019. Developed by Hedgecode.
+ *
+ * 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.hedgecode.chess;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Properties;
+
+/**
+ * ChessHog properties holder.
+ *
+ * @author Dmitry Samoshin aka gotty
+ */
+public class ChessHogProperties {
+
+    /** Properties file. */
+    private static final String PROPERTIES_FILE = "chesshog.properties";
+
+    /** Properties. */
+    private static final Properties PROPERTIES;
+
+    /**
+     * Static properties initialization.
+     */
+    static {
+        PROPERTIES = new Properties();
+        readProperties(PROPERTIES_FILE, PROPERTIES, true);
+    }
+
+    /**
+     * @param propsFile Properties file name.
+     * @param props Properties.
+     * @param throwExc Flag indicating whether to throw an exception or not.
+     */
+    public static void readProperties(String propsFile, Properties props, boolean throwExc) {
+        try (InputStream is = ChessHogProperties.class.getClassLoader().getResourceAsStream(propsFile)) {
+            if (is == null) {
+                if (throwExc)
+                    throw new RuntimeException("Failed to find properties file: " + propsFile);
+                else
+                    return;
+            }
+
+            props.load(is);
+        }
+        catch (IOException e) {
+            throw new RuntimeException("Failed to read properties file: " + propsFile, e);
+        }
+    }
+
+    /**
+     * Empty string for not found properties.
+     */
+    private static final String EMPTY = "";
+
+    /**
+     * Gets property value.
+     *
+     * @param key Property key.
+     * @return Property value (possibly empty string, but never {@code null}).
+     */
+    public static String get(String key) {
+        return PROPERTIES.getProperty(key, EMPTY);
+    }
+
+    /**
+     * Private constructor.
+     */
+    private ChessHogProperties() {
+    }
+
+}