Intial commit - import scenario 2

1 files changed, 89 insertions, 0 deletions

diff --git a/src/pl/edu/mimuw/cloudatlas/model/ValueSimple.java b/src/pl/edu/mimuw/cloudatlas/model/ValueSimple.java
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+/**
+ * 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.model;
+
+/**
+ * Convenient class for wrapping Java types into <code>Value</code> objects.
+ * <p>
+ * This class is immutable.
+ * 
+ * @param <T> a wrapped type
+ */
+abstract class ValueSimple<T> extends Value {
+	private T value;
+	
+	/**
+	 * Constructs a new <code>Value</code> wrapping the specified <code>value</code>.
+	 * 
+	 * @param value the value to wrap
+	 */
+	public ValueSimple(T value) {
+		setValue(value);
+	}
+	
+	/**
+	 * Returns a hash code value for this object. This is a hash code of underlying wrapped object.
+	 * 
+	 * @return the hash code for this value
+	 */
+	@Override
+	public int hashCode() {
+		return getValue().hashCode();
+	}
+	
+	/**
+	 * Gets a wrapped object.
+	 * 
+	 * @return the wrapped value
+	 */
+	public T getValue() {
+		return value;
+	}
+	
+	/**
+	 * Sets a wrapped value. This method is not public to ensure that the underlying value cannot be changed.
+	 * 
+	 * @param value the value to set
+	 */
+	void setValue(T value) {
+		this.value = value;
+	}
+	
+	@Override
+	public boolean isNull() {
+		return value == null;
+	}
+	
+	@SuppressWarnings("unchecked")
+	@Override
+	public Value isEqual(Value v) {
+		sameTypesOrThrow(v, Operation.EQUAL);
+		if(isNull() && v.isNull())
+			return new ValueBoolean(true);
+		else if(isNull() || v.isNull())
+			return new ValueBoolean(false);
+		return new ValueBoolean(value.equals(((ValueSimple<T>)v).getValue()));
+	}
+}