Initialize gradle project

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diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueDuration.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueDuration.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;
+
+import java.lang.IllegalArgumentException;
+import java.text.ParseException;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * A class representing duration in milliseconds. The duration can be negative. This is a simple wrapper of a Java
+ * <code>Long</code> object.
+ */
+public class ValueDuration extends ValueSimple<Long> {
+    public static class InvalidFormatException extends IllegalArgumentException {
+    }
+
+    /**
+     * Regex pattern for duration strings.
+     */
+    private static final Pattern DURATION_PATTERN = Pattern.compile(
+        "(?<sign>[+-])(?<days>\\d+) " +
+        "(?<hours>[0-1][0-9]|2[0-3]):(?<minutes>[0-5][0-9]):(?<seconds>[0-5][0-9])." +
+        "(?<milliseconds>[0-9]{3})"
+    );
+
+    /**
+     * Constructs a new <code>ValueDuration</code> object wrapping the specified <code>value</code>.
+     *
+     * @param value the value to wrap
+     */
+    public ValueDuration(Long value) {
+        super(value);
+    }
+
+    @Override
+    public Type getType() {
+        return TypePrimitive.DURATION;
+    }
+
+    @Override
+    public Value getDefaultValue() {
+        return new ValueDuration(0l);
+    }
+
+    /**
+     * Constructs a new <code>ValueDuration</code> object from the specified amounts of different time units.
+     *
+     * @param seconds a number of full seconds
+     * @param milliseconds a number of milliseconds (an absolute value does not have to be lower than 1000)
+     */
+    public ValueDuration(long seconds, long milliseconds) {
+        this(seconds * 1000l + milliseconds);
+    }
+
+    /**
+     * Constructs a new <code>ValueDuration</code> object from the specified amounts of different time units.
+     *
+     * @param minutes a number of full minutes
+     * @param seconds a number of full seconds (an absolute value does not have to be lower than 60)
+     * @param milliseconds a number of milliseconds (an absolute value does not have to be lower than 1000)
+     */
+    public ValueDuration(long minutes, long seconds, long milliseconds) {
+        this(minutes * 60l + seconds, milliseconds);
+    }
+
+    /**
+     * Constructs a new <code>ValueDuration</code> object from the specified amounts of different time units.
+     *
+     * @param hours a number of full hours
+     * @param minutes a number of full minutes (an absolute value does not have to be lower than 60)
+     * @param seconds a number of full seconds (an absolute value does not have to be lower than 60)
+     * @param milliseconds a number of milliseconds (an absolute value does not have to be lower than 1000)
+     */
+    public ValueDuration(long hours, long minutes, long seconds, long milliseconds) {
+        this(hours * 60l + minutes, seconds, milliseconds);
+    }
+
+    /**
+     * Constructs a new <code>ValueDuration</code> object from the specified amounts of different time units.
+     *
+     * @param days a number of full days
+     * @param hours a number of full hours (an absolute value does not have to be lower than 24)
+     * @param minutes a number of full minutes (an absolute value does not have to be lower than 60)
+     * @param seconds a number of full seconds (an absolute value does not have to be lower than 60)
+     * @param milliseconds a number of milliseconds (an absolute value does not have to be lower than 1000)
+     */
+    public ValueDuration(long days, long hours, long minutes, long seconds, long milliseconds) {
+        this(days * 24l + hours, minutes, seconds, milliseconds);
+    }
+
+    /**
+     * Constructs a new <code>ValueDuration</code> object from its textual representation. The representation has
+     * format: <code>sd hh:mm:ss.lll</code> where:
+     * <ul>
+     * <li><code>s</code> is a sign (<code>+</code> or <code>-</code>),</li>
+     * <li><code>d</code> is a number of days,</li>
+     * <li><code>hh</code> is a number of hours (between <code>00</code> and <code>23</code>),</li>
+     * <li><code>mm</code> is a number of minutes (between <code>00</code> and <code>59</code>),</li>
+     * <li><code>ss</code> is a number of seconds (between <code>00</code> and <code>59</code>),</li>
+     * <li><code>lll</code> is a number of milliseconds (between <code>000</code> and <code>999</code>).</li>
+     * </ul>
+     * <p>
+     * All fields are obligatory.
+     *
+     * @param value a textual representation of a duration
+     * @throws IllegalArgumentException if <code>value</code> does not meet described rules
+     */
+    public ValueDuration(String value) {
+        this(parseDuration(value));
+    }
+
+    private static long parseDuration(String value) {
+        Matcher matcher = DURATION_PATTERN.matcher(value);
+        if (!matcher.matches()) {
+            throw new InvalidFormatException();
+        }
+
+        long result = parseLongGroup(matcher, "days");
+        result *= 24;
+        result += parseLongGroup(matcher, "hours");
+        result *= 60;
+        result += parseLongGroup(matcher, "minutes");
+        result *= 60;
+        result += parseLongGroup(matcher, "seconds");
+        result *= 1000;
+        result += parseLongGroup(matcher, "milliseconds");
+        result *= matcher.group("sign").equals("+") ? 1 : -1;
+
+        return result;
+    }
+
+    private static long parseLongGroup(Matcher matcher, String group) {
+        return Long.parseLong(matcher.group(group));
+    }
+
+    @Override
+    public ValueBoolean isLowerThan(Value value) {
+        sameTypesOrThrow(value, Operation.COMPARE);
+        if(isNull() || value.isNull())
+            return new ValueBoolean(null);
+        return new ValueBoolean(getValue() < ((ValueDuration)value).getValue());
+    }
+
+    @Override
+    public ValueDuration addValue(Value value) {
+        sameTypesOrThrow(value, Operation.ADD);
+        if (isNull() || value.isNull()) {
+            return new ValueDuration((Long) null);
+        }
+
+        return new ValueDuration(getValue() + ((ValueDuration)value).getValue());
+    }
+
+    @Override
+    public ValueDuration subtract(Value value) {
+        sameTypesOrThrow(value, Operation.SUBTRACT);
+        if (isNull() || value.isNull())
+            return new ValueDuration((Long) null);
+        return new ValueDuration(getValue() - ((ValueDuration)value).getValue());
+    }
+
+    @Override
+    public ValueDuration multiply(Value value) {
+        if (!value.getType().isCompatible(TypePrimitive.INTEGER)) {
+            throw new IncompatibleTypesException(getType(), value.getType(), Operation.MULTIPLY);
+        }
+
+        if (isNull() || value.isNull()) {
+            return new ValueDuration((Long) null);
+        }
+
+        return new ValueDuration(getValue() * ((ValueInt)value).getValue());
+    }
+
+    @Override
+    public Value divide(Value value) {
+        if (!value.getType().isCompatible(TypePrimitive.INTEGER)) {
+            throw new IncompatibleTypesException(getType(), value.getType(), Operation.MULTIPLY);
+        }
+
+        if (isNull() || value.isNull()) {
+            return new ValueDuration((Long) null);
+        }
+
+        if (((ValueInt)value).getValue() == 0l) {
+            throw new ArithmeticException("Division by zero.");
+        }
+
+        return new ValueDuration(getValue() / ((ValueInt)value).getValue());
+    }
+
+    @Override
+    public ValueDuration modulo(Value value) {
+        if (!value.getType().isCompatible(TypePrimitive.INTEGER)) {
+            throw new IncompatibleTypesException(getType(), value.getType(), Operation.MULTIPLY);
+        }
+
+        if (isNull() || value.isNull()) {
+            return new ValueDuration((Long) null);
+        }
+
+        if (((ValueInt)value).getValue() == 0l) {
+            throw new ArithmeticException("Division by zero.");
+        }
+
+        return new ValueDuration(getValue() % ((ValueInt)value).getValue());
+    }
+
+    @Override
+    public ValueDuration negate() {
+        if(isNull()) {
+            return new ValueDuration((Long) null);
+        }
+
+        return new ValueDuration(-getValue());
+    }
+
+    public String toString() {
+        long remainingUnits = getValue();
+        boolean positive = remainingUnits >= 0;
+        remainingUnits = positive ? remainingUnits : -remainingUnits;
+
+        long milliseconds = remainingUnits % 1000;
+        remainingUnits /= 1000;
+        long seconds = remainingUnits % 60;
+        remainingUnits /= 60;
+        long minutes = remainingUnits % 60;
+        remainingUnits /= 60;
+        long hours = remainingUnits % 24;
+        remainingUnits /= 24;
+        long days = remainingUnits;
+
+        return (positive ? "+" : "-") + Long.toString(days) + " " + Long.toString(hours)
+            + ":" + Long.toString(minutes) + ":" + Long.toString(seconds) + "." +
+            Long.toString(milliseconds);
+    }
+
+    @Override
+    public Value convertTo(Type type) {
+        switch(type.getPrimaryType()) {
+            case STRING:
+                return getValue() == null? ValueString.NULL_STRING : new ValueString(toString());
+            case DURATION:
+                return this;
+            default:
+                throw new UnsupportedConversionException(getType(), type);
+        }
+    }
+}