feat: io.cloudquery.scalar.Binary implementation (#20)

Author: candiduslynx

lib/src/main/java/io/cloudquery/scalar/Binary.java

@@ -0,0 +1,97 @@
+package io.cloudquery.scalar;
+
+import org.apache.arrow.vector.types.pojo.ArrowType;
+import org.apache.commons.codec.binary.Base64;
+
+import java.util.Arrays;
+
+public class Binary implements Scalar {
+    protected byte[] value;
+    protected boolean valid;
+
+    public Binary() {
+    }
+
+    public Binary(Object value) throws ValidationException {
+        this.set(value);
+    }
+
+    @Override
+    public String toString() {
+        if (this.valid) {
+            return Base64.encodeBase64String(this.value);
+        }
+        return NULL_VALUE_STRING;
+    }
+
+    @Override
+    public boolean isValid() {
+        return this.valid;
+    }
+
+    @Override
+    public ArrowType dataType() {
+        return ArrowType.Binary.INSTANCE;
+    }
+
+    @Override
+    public void set(Object value) throws ValidationException {
+        if (value == null) {
+            this.valid = false;
+            this.value = null;
+            return;
+        }
+
+        if (value instanceof Scalar scalar) {
+            if (!scalar.isValid()) {
+                this.valid = false;
+                this.value = null;
+                return;
+            }
+
+            this.set(scalar.get());
+            return;
+        }
+
+        if (value instanceof byte[] bytes) {
+            this.valid = true;
+            this.value = bytes;
+            return;
+        }
+
+        if (value instanceof String string) {
+            this.valid = true;
+            this.value = Base64.decodeBase64(string);
+            return;
+        }
+
+        if (value instanceof char[] chars) {
+            this.valid = true;
+            this.value = Base64.decodeBase64(new String(chars));
+            return;
+        }
+
+        throw new ValidationException(ValidationException.NO_CONVERSION_AVAILABLE, this.dataType(), value);
+    }
+
+    @Override
+    public Object get() {
+        if (this.valid) {
+            return this.value;
+        }
+        return null;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other == null) {
+            return false;
+        }
+
+        if (!(other instanceof Binary o)) {
+            return false;
+        }
+
+        return (this.valid && o.valid) && Arrays.equals(this.value, o.value);
+    }
+}

lib/src/main/java/io/cloudquery/scalar/LargeBinary.java

@@ -0,0 +1,18 @@
+package io.cloudquery.scalar;
+
+import org.apache.arrow.vector.types.pojo.ArrowType;
+
+public class LargeBinary extends Binary {
+
+    public LargeBinary() {
+    }
+
+    public LargeBinary(Object value) throws ValidationException {
+        this.set(value);
+    }
+
+    @Override
+    public ArrowType dataType() {
+        return ArrowType.LargeBinary.INSTANCE;
+    }
+}

lib/src/main/java/io/cloudquery/scalar/Scalar.java

@@ -3,15 +3,17 @@
 import org.apache.arrow.vector.types.pojo.ArrowType;
 
 public interface Scalar {
-    String String();
+    String toString();
 
-    Boolean IsValid();
+    boolean isValid();
 
-    ArrowType DataType();
+    ArrowType dataType();
 
-    void Set(Object obj);
+    void set(Object value) throws ValidationException;
 
-    Object Get();
+    Object get();
 
-    Boolean Equal(Scalar other);
+    boolean equals(Object other);
+
+    String NULL_VALUE_STRING = "(null)";
 }

lib/src/main/java/io/cloudquery/scalar/ValidationException.java

@@ -0,0 +1,42 @@
+package io.cloudquery.scalar;
+
+import org.apache.arrow.vector.types.pojo.ArrowType;
+
+public class ValidationException extends Exception {
+    public Throwable cause;
+    public String message;
+    public ArrowType type;
+    private final Object value;
+
+    static final String NO_CONVERSION_AVAILABLE = "no conversion available";
+
+
+    ValidationException(Throwable cause, String message, ArrowType type, Object value) {
+        super(message, cause);
+        this.cause = cause;
+        this.message = message;
+        this.type = type;
+        this.value = value;
+    }
+
+    ValidationException(String message, ArrowType type, Object value) {
+        super(message);
+        this.message = message;
+        this.type = type;
+        this.value = value;
+    }
+
+    public String Error() {
+        if (this.cause == null) {
+            return String.format("cannot set `%s` with value `%s`: %s", this.type, this.value, this.message);
+        }
+        return String.format("cannot set `%s` with value `%s`: %s (%s)", this.type, this.value, this.message, this.cause);
+    }
+
+    public String Masked() {
+        if (this.cause == null) {
+            return String.format("cannot set `%s`: %s", this.type.toString(), this.message);
+        }
+        return String.format("cannot set `%s`: %s (%s)", this.type.toString(), this.message, this.cause);
+    }
+}