Property files are now being read by the property component

so they can also be provided by another component (such as a database
which is started).

diff --git a/system/general/src/main/java/org/wamblee/system/components/PropertyComponent.java b/system/general/src/main/java/org/wamblee/system/components/PropertyComponent.java
new file mode 100644 (file)
index 0000000..d3c7e07
--- /dev/null
+++ b/system/general/src/main/java/org/wamblee/system/components/PropertyComponent.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2008 the original author or authors.
+ * 
+ * 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.wamblee.system.components;
+
+import java.io.IOException;
+import java.util.Properties;
+
+import org.wamblee.io.InputResource;
+import org.wamblee.system.core.AbstractComponent;
+import org.wamblee.system.core.DefaultProvidedInterface;
+import org.wamblee.system.core.ProvidedInterface;
+import org.wamblee.system.core.Scope;
+
+/**
+ * Property component that reads a property file and provides
+ * it to other components through a provided interface.
+ * 
+ * NOTE: when multiple property components are used, disambiguation
+ * of provided and required interfaces is needed. 
+ *  
+ * @author Erik Brakkee
+ */
+public class PropertyComponent extends AbstractComponent<Properties> {
+    
+    private static ProvidedInterface PROPS = new DefaultProvidedInterface("props", Properties.class);
+    
+    private Properties _props;
+    
+    public PropertyComponent(String aName, InputResource aResource) throws IOException { 
+        this(aName, readProps(aResource)); 
+    }
+    
+    private static Properties readProps(InputResource aResource) throws IOException {
+        Properties props = new Properties(); 
+        props.load(aResource.getInputStream());
+        return props; 
+    }
+
+    public PropertyComponent(String aName, Properties aProps) {
+        super(aName);
+        _props = aProps; 
+        
+        addProvidedInterface(PROPS);
+    }
+
+    @Override
+    protected Properties doStart(Scope aScope) {
+        addInterface(PROPS, _props, aScope);
+        return _props; 
+    }
+
+    @Override
+    protected void doStop(Properties aRuntime) {
+        // Empty 
+    }
+
+}