Add query language interpreter code

1 files changed, 103 insertions, 0 deletions

diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/ResultSingle.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/ResultSingle.java
new file mode 100644
index 0000000..ada8f93
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/ResultSingle.java
@@ -0,0 +1,103 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import pl.edu.mimuw.cloudatlas.model.Type;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueBoolean;
+import pl.edu.mimuw.cloudatlas.model.ValueList;
+
+class ResultSingle extends Result {
+	private final Value value;
+
+	public ResultSingle(Value value) {
+		this.value = value;
+	}
+	
+	@Override
+	protected ResultSingle binaryOperationTyped(BinaryOperation operation, ResultSingle right) {
+		return new ResultSingle(operation.perform(value, right.value));
+	}
+
+	@Override
+	public ResultSingle unaryOperation(UnaryOperation operation) {
+		return new ResultSingle(operation.perform(value));
+	}
+
+	@Override
+	protected Result callMe(BinaryOperation operation, Result left) {
+		return left.binaryOperationTyped(operation, this);
+	}
+
+	@Override
+	public Value getValue() {
+		return value;
+	}
+
+	@Override
+	public ValueList getList() {
+		throw new UnsupportedOperationException("Not a ResultList.");
+	}
+
+	@Override
+	public ValueList getColumn() {
+		throw new UnsupportedOperationException("Not a ResultColumn.");
+	}
+
+	@Override
+	public Result filterNulls() {
+		throw new UnsupportedOperationException("Operation filterNulls not supported on ResultSingle.");
+	}
+
+	@Override
+	public Result first(int size) {
+		throw new UnsupportedOperationException("Operation first not supported on ResultSingle.");
+	}
+
+	@Override
+	public Result last(int size) {
+		throw new UnsupportedOperationException("Operation last not supported on ResultSingle.");
+	}
+
+	@Override
+	public Result random(int size) {
+		throw new UnsupportedOperationException("Operation random not supported on ResultSingle.");
+	}
+
+	@Override
+	public ResultSingle convertTo(Type to) {
+		return new ResultSingle(value.convertTo(to));
+	}
+
+	@Override
+	public ResultSingle isNull() {
+		return new ResultSingle(new ValueBoolean(value.isNull()));
+	}
+
+	@Override
+	public Type getType() {
+		return value.getType();
+	}
+}