From b1078581d4730d4944180a739fcce51a39259112 Mon Sep 17 00:00:00 2001 From: Marcin Chrzanowski Date: Sun, 3 Nov 2019 12:55:03 +0100 Subject: Initialize gradle project --- .../java/pl/edu/mimuw/cloudatlas/model/Value.java | 241 +++++++++++++++++++++ 1 file changed, 241 insertions(+) create mode 100644 src/main/java/pl/edu/mimuw/cloudatlas/model/Value.java (limited to 'src/main/java/pl/edu/mimuw/cloudatlas/model/Value.java') diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/Value.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/Value.java new file mode 100644 index 0000000..c4054cf --- /dev/null +++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/Value.java @@ -0,0 +1,241 @@ +/** + * 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 pl.edu.mimuw.cloudatlas.model.Value; + +/** + * A single value stored as an attribute. + */ +public abstract class Value { + /** + * An operation that may be performed on values. + */ + public enum Operation { + EQUAL, COMPARE, ADD, SUBTRACT, MULTIPLY, DIVIDE, MODULO, AND, OR, REG_EXPR, NEGATE, VALUE_SIZE, + } + + /** + * Gets the type of this value. + * + * @return type of this value + */ + public abstract Type getType(); + + /** + * Indicates whether this value is null. Distinct from a Value reference that is null + * itself. + * + * @return true if and only if this value is null + */ + public abstract boolean isNull(); + + protected final void sameTypesOrThrow(Value value, Operation operation) { + if(!getType().isCompatible(value.getType())) + throw new IncompatibleTypesException(getType(), value.getType(), operation); + } + + /** + * Checks whether this value is equal to the specified one (operator ==). + * + * @param value the right side of the operator + * @return a ValueBoolean representing true if and only if both values are equal + * @throws UnsupportedValueOperationException if this operation is unsupported for these values + */ + public Value isEqual(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.EQUAL); + } + + /** + * Indicates whether this object is equal to another one. + * + * @param object the object to check + * @return whether two objects are equal + */ + @Override + public boolean equals(Object object) { + if(!(object instanceof Value)) + return false; + return ((ValueBoolean)isEqual((Value)object)).getValue(); + } + + /** + * Checks whether this value is lower than the specified one (operator <=). + * + * @param value the right side of the operator + * @return a ValueBoolean representing true if and only if this value is lower than the provided one + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * incompatible or non-numeric types) + */ + public Value isLowerThan(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.COMPARE); + } + + /** + * Returns a new value created by adding argument to this value (operator +). + * + * @param value the right side of the operator + * @return a sum of two values + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * incompatible or non-numeric types) + */ + public Value addValue(Value value) { + // name clash with add from List interface + throw new UnsupportedValueOperationException(getType(), Operation.ADD); + } + + /** + * Returns a new value created by subtracting argument from this value (operator -). + * + * @param value the right side of the operator + * @return a difference of two values + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * incompatible or non-numeric types) + */ + public Value subtract(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.SUBTRACT); + } + + /** + * Returns a new value created by multiplying this value by an argument (operator *). + * + * @param value the right side of the operator + * @return a product of two values + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * incompatible or non-numeric types) + */ + public Value multiply(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.MULTIPLY); + } + + /** + * Returns a new value created by dividing this value by an argument (operator /). + * + * @param value the right side of the operator + * @return a quotient of two values + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * incompatible or non-numeric types) + */ + public Value divide(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.DIVIDE); + } + + /** + * Returns the remainder of division of this value by an argument (operator %). + * + * @param value the right side of the operator + * @return a remainder + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * incompatible or non-numeric types) + */ + public Value modulo(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.MODULO); + } + + /** + * Returns the result of a logical AND (operator &&). + * + * @param value the right side of the operator + * @return a conjunction of the two values + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * non-boolean types) + */ + public Value and(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.AND); + } + + /** + * Returns the result of a logical OR (operator ||). + * + * @param value the right side of the operator + * @return an alternative of two values + * @throws UnsupportedValueOperationException if this operator is unsupported for these values (for example + * non-boolean types) + */ + public Value or(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.OR); + } + + /** + * Returns a result of trying to match to this value with a regular expression specified as an argument. + * + * @param value the regular expression to match against + * @return a ValueBoolean representing true if and only if this value matches provided regular + * expression + * @throws UnsupportedValueOperationException if this operator is unsupported for these values + */ + public Value regExpr(Value value) { + throw new UnsupportedValueOperationException(getType(), Operation.REG_EXPR); + } + + /** + * Returns the negation (numeric or logical) of this value. This may refer to operator - or !, depending on type. + * + * @return a value that is the negation of this value + * @throws UnsupportedValueOperationException if this operator is unsupported for this value + */ + public Value negate() { // !, - + throw new UnsupportedValueOperationException(getType(), Operation.NEGATE); + } + + /** + * Returns the size of this value. Semantics depend on type. + * + * @return a size of this value + * @throws UnsupportedValueOperationException if this operation is unsupported for this value + */ + public Value valueSize() { + // name clash with size from List interface + throw new UnsupportedValueOperationException(getType(), Operation.VALUE_SIZE); + } + + /** + * Returns this value converted to another type. + * + * @param to a desired type + * @return this value converted to the type + * @throws UnsupportedConversionException if a requested conversion is unsupported + */ + public abstract Value convertTo(Type to); + + /** + * Returns a textual representation of this value. This method uses conversion to ValueString. + * + * @return a textual representation of this value + * @see #convertTo(Type) + */ + @Override + public String toString() { + return ((ValueString)convertTo(TypePrimitive.STRING)).getValue(); + } + + /** + * Returns a default value (such as an uninitialized variable). This may be 0 for integer types, + * false for boolean, null for complex types, etc. + * + * @return a default value of this type + */ + public abstract Value getDefaultValue(); +} -- cgit v1.2.3