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diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/internal/ResourceData.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/internal/ResourceData.java
new file mode 100644
index 000000000..9f728ba9b
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/internal/ResourceData.java
@@ -0,0 +1,216 @@
+package org.simantics.db.impl.internal;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import org.simantics.databoard.util.binary.BinaryFile;
+import org.simantics.databoard.util.binary.RandomAccessBinary;
+
+public class ResourceData implements RandomAccessBinary {
+	private boolean changed = false;
+    public final BinaryFile binaryFile;
+    public final boolean oldExternalValue; 
+    public ResourceData(BinaryFile binaryFile, boolean oldExternalValue) {
+        this.binaryFile = binaryFile;
+        this.oldExternalValue = oldExternalValue;
+    }
+    public boolean isChanged() {
+    	return changed;
+    }
+	@Override
+	public void writeFully(ByteBuffer src) throws IOException {
+		binaryFile.writeFully(src);
+		changed = true;
+	}
+	@Override
+	public void writeFully(ByteBuffer src, int length) throws IOException {
+		binaryFile.writeFully(src, length);
+		changed = true;
+	}
+	@Override
+	public void write(int b) throws IOException {
+		binaryFile.write(b);
+		changed = true;
+	}
+	@Override
+	public void write(byte[] b) throws IOException {
+		binaryFile.write(b);
+		changed = true;
+	}
+	@Override
+	public void write(byte[] b, int off, int len) throws IOException {
+		binaryFile.write(b, off, len);
+		changed = true;
+	}
+	@Override
+	public void writeBoolean(boolean v) throws IOException {
+		binaryFile.writeBoolean(v);
+		changed = true;
+	}
+	@Override
+	public void writeByte(int v) throws IOException {
+		binaryFile.writeByte(v);
+		changed = true;
+	}
+	@Override
+	public void writeShort(int v) throws IOException {
+		binaryFile.writeShort(v);
+		changed = true;
+	}
+	@Override
+	public void writeChar(int v) throws IOException {
+		binaryFile.writeChar(v);
+		changed = true;
+	}
+	@Override
+	public void writeInt(int v) throws IOException {
+		binaryFile.writeInt(v);
+		changed = true;
+	}
+	@Override
+	public void writeLong(long v) throws IOException {
+		binaryFile.writeLong(v);
+		changed = true;
+	}
+	@Override
+	public void writeFloat(float v) throws IOException {
+		binaryFile.writeFloat(v);
+		changed = true;
+	}
+	@Override
+	public void writeDouble(double v) throws IOException {
+		binaryFile.writeDouble(v);
+		changed = true;
+	}
+	@Override
+	public void writeBytes(String s) throws IOException {
+		binaryFile.writeBytes(s);
+		changed = true;
+	}
+	@Override
+	public void writeChars(String s) throws IOException {
+		binaryFile.writeChars(s);
+		changed = true;
+	}
+	@Override
+	public void writeUTF(String s) throws IOException {
+		binaryFile.writeUTF(s);
+		changed = true;
+	}
+	@Override
+	public long skipBytes(long bytes) throws IOException {
+		return binaryFile.skipBytes(bytes);
+	}
+	@Override
+	public void readFully(ByteBuffer buf) throws IOException {
+		binaryFile.readFully(buf);
+	}
+	@Override
+	public void readFully(ByteBuffer buf, int length) throws IOException {
+		binaryFile.readFully(buf, length);
+	}
+	@Override
+	public void readFully(byte[] b) throws IOException {
+		binaryFile.readFully(b);
+	}
+	@Override
+	public void readFully(byte[] b, int off, int len) throws IOException {
+		binaryFile.readFully(b, off, len);
+	}
+	@Override
+	public int skipBytes(int n) throws IOException {
+		return binaryFile.skipBytes(n);
+	}
+	@Override
+	public boolean readBoolean() throws IOException {
+		return binaryFile.readBoolean();
+	}
+	@Override
+	public byte readByte() throws IOException {
+		return binaryFile.readByte();
+	}
+	@Override
+	public int readUnsignedByte() throws IOException {
+		return binaryFile.readUnsignedByte();
+	}
+	@Override
+	public short readShort() throws IOException {
+		return binaryFile.readShort();
+	}
+	@Override
+	public int readUnsignedShort() throws IOException {
+		return binaryFile.readUnsignedShort();
+	}
+	@Override
+	public char readChar() throws IOException {
+		return binaryFile.readChar();
+	}
+	@Override
+	public int readInt() throws IOException {
+		return binaryFile.readInt();
+	}
+	@Override
+	public long readLong() throws IOException {
+		return binaryFile.readLong();
+	}
+	@Override
+	public float readFloat() throws IOException {
+		return binaryFile.readFloat();
+	}
+	@Override
+	public double readDouble() throws IOException {
+		return binaryFile.readDouble();
+	}
+	@Override
+	public String readLine() throws IOException {
+		return binaryFile.readLine();
+	}
+	@Override
+	public String readUTF() throws IOException {
+		return binaryFile.readUTF();
+	}
+	@Override
+	public void flush() throws IOException {
+		binaryFile.flush();
+	}
+	@Override
+	public void reset() throws IOException {
+		binaryFile.reset();
+		changed = true;
+	}
+	@Override
+	public void removeBytes(long bytes, ByteSide side) throws IOException {
+		binaryFile.removeBytes(bytes, side);
+		changed = true;
+	}
+	@Override
+	public void insertBytes(long bytes, ByteSide side) throws IOException {
+		binaryFile.insertBytes(bytes, side);
+		changed = true;
+	}
+	@Override
+	public void setLength(long newLength) throws IOException {
+		binaryFile.setLength(newLength);
+		changed = true;
+	}
+	@Override
+	public long length() throws IOException {
+		return binaryFile.length();
+	}
+	@Override
+	public void close() throws IOException {
+		binaryFile.close();
+	}
+	@Override
+	public boolean isOpen() {
+		return binaryFile.isOpen();
+	}
+	@Override
+	public void position(long newPosition) throws IOException {
+		binaryFile.position(newPosition);
+	}
+	@Override
+	public long position() throws IOException {
+		return binaryFile.position();
+	}
+}