-/*******************************************************************************\r
- * Copyright (c) 2007 VTT Technical Research Centre of Finland and others.\r
- * All rights reserved. This program and the accompanying materials\r
- * are made available under the terms of the Eclipse Public License v1.0\r
- * which accompanies this distribution, and is available at\r
- * http://www.eclipse.org/legal/epl-v10.html\r
- *\r
- * Contributors:\r
- * VTT Technical Research Centre of Finland - initial API and implementation\r
- *******************************************************************************/\r
-package org.simantics.databoard.example;\r
-\r
-import java.io.File;\r
-import java.util.Arrays;\r
-\r
-import org.simantics.databoard.Accessors;\r
-import org.simantics.databoard.Bindings;\r
-import org.simantics.databoard.Datatypes;\r
-import org.simantics.databoard.accessor.file.FileArrayAccessor;\r
-import org.simantics.databoard.accessor.file.FileVariantAccessor;\r
-import org.simantics.databoard.binding.Binding;\r
-import org.simantics.databoard.binding.mutable.MutableVariant;\r
-import org.simantics.databoard.serialization.Serializer;\r
-import org.simantics.databoard.type.ArrayType;\r
-\r
-public class FileAccessorExample {\r
-\r
- public static void main(String[] args) throws Exception {\r
- \r
- //\r
- // File Accessor is an access to data that resides in a file in\r
- // byte format.\r
- //\r
- \r
- // Create new binary file\r
- File file = File.createTempFile("variable", ".dbb");\r
- // Create file and open an accessor\r
- // Files are always variants, so the root accessor is VariantAccessor.\r
- FileVariantAccessor fa = Accessors.createFile(file); \r
- \r
- // We can put any value into the file\r
- fa.setContentValue( Bindings.STRING, "Hello World!" );\r
- // Or change it to completely another type \r
- fa.setContentValue( Bindings.INTEGER, 500 );\r
- \r
- // Values are normally flushed automatically\r
- // If special *Noflush methods are used... \r
- fa.setContentValueNoflush( Bindings.DOUBLE, 99.0 );\r
- // then a separate cache flush is required.\r
- fa.flush();\r
- \r
- // Close the file\r
- fa.close();\r
- \r
- \r
- \r
- // Re-open the file, get an accessor\r
- fa = Accessors.openAccessor(file); \r
- // Lets read what the type is\r
- System.out.println( fa.getContentType() );\r
- // Read the content, we know its a Double so we use an instance of DoubleBinding\r
- Double value = (Double) fa.getContentValue( Bindings.DOUBLE );\r
- System.out.println( value );\r
- \r
- \r
- \r
- // Large datasets can be accessed partially\r
- // It conserves memory.\r
- \r
- // Initialize the file into a Float[]\r
- ArrayType floatArrayType = new ArrayType( Datatypes.FLOAT );\r
- Binding binding = Bindings.getMutableBinding( floatArrayType );\r
- fa.setContentValue( binding, binding.createDefault() );\r
- \r
- // Write partially \r
- // Get a sub-accessor to content of the file. \r
- FileArrayAccessor aa = (FileArrayAccessor) fa.getContentAccessor();\r
- // Add 1024 entries one by one\r
- for (int i=0; i<1024; i++) {\r
- float v = i * 1.5f;\r
- aa.addNoflush( Bindings.FLOAT, v );\r
- }\r
- // Flushing ensures bytes are moved from memory cache to disc\r
- // Note, reading works without flushing\r
- aa.flush();\r
-\r
- // Read partially\r
- System.out.print("[");\r
- for (int i=0; i<aa.size(); i++) {\r
- System.out.print( aa.get(i, Bindings.FLOAT) );\r
- System.out.print( ", ");\r
- }\r
- System.out.println("]");\r
- \r
- // Read all-at-once\r
- binding = Bindings.getBinding( float[].class );\r
- float data[] = (float[]) aa.getValue( binding );\r
- System.out.println( Arrays.toString(data) );\r
- \r
- // File handle can be closed from any of its accessors (fa and aa)\r
- aa.close();\r
- \r
- \r
- \r
- \r
- // To read the data all-at-once an accessor is not needed, you can use Serializer aswell\r
- \r
- // The root of the file is always Variant so use an instance of VariantBinding\r
- Serializer s = Bindings.getSerializerUnchecked( Bindings.MUTABLE_VARIANT ); \r
- MutableVariant variant = (MutableVariant) s.deserialize( file );\r
- data = (float[]) variant.getValue( binding );\r
- System.out.println( Arrays.toString(data) ); \r
- \r
- \r
- // Delete tmp file\r
- file.delete(); \r
- }\r
- \r
-}\r
-\r
+/*******************************************************************************
+ * Copyright (c) 2007 VTT Technical Research Centre of Finland and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.databoard.example;
+
+import java.io.File;
+import java.util.Arrays;
+
+import org.simantics.databoard.Accessors;
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.Datatypes;
+import org.simantics.databoard.accessor.file.FileArrayAccessor;
+import org.simantics.databoard.accessor.file.FileVariantAccessor;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.mutable.MutableVariant;
+import org.simantics.databoard.serialization.Serializer;
+import org.simantics.databoard.type.ArrayType;
+
+public class FileAccessorExample {
+
+ public static void main(String[] args) throws Exception {
+
+ //
+ // File Accessor is an access to data that resides in a file in
+ // byte format.
+ //
+
+ // Create new binary file
+ File file = File.createTempFile("variable", ".dbb");
+ // Create file and open an accessor
+ // Files are always variants, so the root accessor is VariantAccessor.
+ FileVariantAccessor fa = Accessors.createFile(file);
+
+ // We can put any value into the file
+ fa.setContentValue( Bindings.STRING, "Hello World!" );
+ // Or change it to completely another type
+ fa.setContentValue( Bindings.INTEGER, 500 );
+
+ // Values are normally flushed automatically
+ // If special *Noflush methods are used...
+ fa.setContentValueNoflush( Bindings.DOUBLE, 99.0 );
+ // then a separate cache flush is required.
+ fa.flush();
+
+ // Close the file
+ fa.close();
+
+
+
+ // Re-open the file, get an accessor
+ fa = Accessors.openAccessor(file);
+ // Lets read what the type is
+ System.out.println( fa.getContentType() );
+ // Read the content, we know its a Double so we use an instance of DoubleBinding
+ Double value = (Double) fa.getContentValue( Bindings.DOUBLE );
+ System.out.println( value );
+
+
+
+ // Large datasets can be accessed partially
+ // It conserves memory.
+
+ // Initialize the file into a Float[]
+ ArrayType floatArrayType = new ArrayType( Datatypes.FLOAT );
+ Binding binding = Bindings.getMutableBinding( floatArrayType );
+ fa.setContentValue( binding, binding.createDefault() );
+
+ // Write partially
+ // Get a sub-accessor to content of the file.
+ FileArrayAccessor aa = (FileArrayAccessor) fa.getContentAccessor();
+ // Add 1024 entries one by one
+ for (int i=0; i<1024; i++) {
+ float v = i * 1.5f;
+ aa.addNoflush( Bindings.FLOAT, v );
+ }
+ // Flushing ensures bytes are moved from memory cache to disc
+ // Note, reading works without flushing
+ aa.flush();
+
+ // Read partially
+ System.out.print("[");
+ for (int i=0; i<aa.size(); i++) {
+ System.out.print( aa.get(i, Bindings.FLOAT) );
+ System.out.print( ", ");
+ }
+ System.out.println("]");
+
+ // Read all-at-once
+ binding = Bindings.getBinding( float[].class );
+ float data[] = (float[]) aa.getValue( binding );
+ System.out.println( Arrays.toString(data) );
+
+ // File handle can be closed from any of its accessors (fa and aa)
+ aa.close();
+
+
+
+
+ // To read the data all-at-once an accessor is not needed, you can use Serializer aswell
+
+ // The root of the file is always Variant so use an instance of VariantBinding
+ Serializer s = Bindings.getSerializerUnchecked( Bindings.MUTABLE_VARIANT );
+ MutableVariant variant = (MutableVariant) s.deserialize( file );
+ data = (float[]) variant.getValue( binding );
+ System.out.println( Arrays.toString(data) );
+
+
+ // Delete tmp file
+ file.delete();
+ }
+
+}
+
Code Review / simantics / platform.git / blobdiff