| /* |
| * Copyright (c) 2011, 2021 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation |
| // |
| package org.eclipse.persistence.jpa.jpql.tools.model.query; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import org.eclipse.persistence.jpa.jpql.parser.ArithmeticFactor; |
| import org.eclipse.persistence.jpa.jpql.parser.ArithmeticFactorBNF; |
| import static org.eclipse.persistence.jpa.jpql.parser.AbstractExpression.*; |
| |
| /** |
| * This state object simply adds a plus or minus sign to the arithmetic primary expression. |
| * |
| * <div><p><b>BNF:</b> <code>arithmetic_factor ::= [{+|-}] arithmetic_primary</code></p></div> |
| * |
| * @see ArithmeticFactor |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings({"nls", "unused"}) // unused used for the import statement: see bug 330740 |
| public class ArithmeticFactorStateObject extends AbstractStateObject { |
| |
| /** |
| * <code>true</code> if the arithmetic sign is the plus sign; <code>false</code> otherwise. |
| */ |
| private boolean plusSign; |
| |
| /** |
| * The {@link StateObject} that represents the arithmetic primary expression. |
| */ |
| private StateObject stateObject; |
| |
| /** |
| * Notifies the arithmetic sign property has changed. |
| */ |
| public static final String ARITHMETIC_SIGN_PROPERTY = "arithmeticSign"; |
| |
| /** |
| * Notifies the state object property has changed. |
| */ |
| public static final String STATE_OBJECT_PROPERTY = "stateObject"; |
| |
| /** |
| * Creates a new <code>ArithmeticFactorStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| public ArithmeticFactorStateObject(StateObject parent) { |
| super(parent); |
| } |
| |
| /** |
| * Creates a new <code>ArithmeticFactorStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param stateObject The {@link StateObject} that represents the arithmetic primary expression |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| public ArithmeticFactorStateObject(StateObject parent, boolean plusSign, StateObject stateObject) { |
| super(parent); |
| this.plusSign = plusSign; |
| this.stateObject = parent(stateObject); |
| } |
| |
| @Override |
| public void accept(StateObjectVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| protected void addChildren(List<StateObject> children) { |
| super.addChildren(children); |
| if (stateObject != null) { |
| children.add(stateObject); |
| } |
| } |
| |
| /** |
| * Makes sure the <code><b>-</b></code> sign is used. |
| */ |
| public void addMinus() { |
| if (plusSign) { |
| setArithmeticSign(false); |
| } |
| } |
| |
| /** |
| * Makes sure the <code><b>+</b></code> sign is used. |
| */ |
| public void addPlus() { |
| if (!plusSign) { |
| setArithmeticSign(true); |
| } |
| } |
| |
| /** |
| * Returns the arithmetic sign this expression is actually representing. |
| * |
| * @return The single character value of the arithmetic sign: '+' or '-' |
| */ |
| public String getArithmeticSign() { |
| return plusSign ? PLUS : MINUS; |
| } |
| |
| @Override |
| public ArithmeticFactor getExpression() { |
| return (ArithmeticFactor) super.getExpression(); |
| } |
| |
| /** |
| * Returns the {@link StateObject} that represents the arithmetic primary expression. |
| * |
| * @return The {@link StateObject} that represents the arithmetic primary expression or |
| * <code>null</code> if none was specified |
| */ |
| public StateObject getStateObject() { |
| return stateObject; |
| } |
| |
| /** |
| * Determines whether the arithmetic sign is the minus sign. |
| * |
| * @return <code>true</code> if the arithmetic sign is the minus sign; <code>false</code> if it |
| * is the plus sign |
| */ |
| public boolean hasMinusSign() { |
| return !plusSign; |
| } |
| |
| /** |
| * Determines whether the arithmetic sign is the plus sign. |
| * |
| * @return <code>true</code> if the arithmetic sign is the plus sign; <code>false</code> if it |
| * is the minus sign |
| */ |
| public boolean hasPlusSign() { |
| return plusSign; |
| } |
| |
| /** |
| * Determines whether an {@link StateObject} representing the arithmetic primary expression |
| * exists. |
| * |
| * @return <code>true</code> if there is the arithmetic primary expression exists; <code>false</code> |
| * otherwise |
| */ |
| public boolean hasStateObject() { |
| return stateObject != null; |
| } |
| |
| @Override |
| public boolean isEquivalent(StateObject stateObject) { |
| |
| if (super.isEquivalent(stateObject)) { |
| ArithmeticFactorStateObject arithmeticFactor = (ArithmeticFactorStateObject) stateObject; |
| return plusSign == arithmeticFactor.plusSign && |
| areEquivalent(stateObject, arithmeticFactor.stateObject); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Parses the given JPQL fragment to become the new arithmetic primary. |
| * |
| * @param jpqlFragment A portion of a query that will be parsed and the {@link StateObject} that |
| * was created will become the new arithmetic primary of this {@link ArithmeticFactorStateObject} |
| */ |
| public void parse(String jpqlFragment) { |
| StateObject stateObject = buildStateObject(jpqlFragment, ArithmeticFactorBNF.ID); |
| setStateObject(stateObject); |
| } |
| |
| /** |
| * Sets the arithmetic sign this expression is actually representing. |
| * |
| * @param plusSign The single character value of the arithmetic sign: '+' (<code>true</code>) or |
| * '-' (<code>false</code>) |
| */ |
| public void setArithmeticSign(boolean plusSign) { |
| boolean oldPlusSign = plusSign; |
| this.plusSign = !oldPlusSign; |
| firePropertyChanged(ARITHMETIC_SIGN_PROPERTY, oldPlusSign, plusSign); |
| } |
| |
| /** |
| * Keeps a reference of the {@link ArithmeticFactor parsed object} object, which should only be |
| * done when this object is instantiated during the conversion of a parsed JPQL query into |
| * {@link StateObject StateObjects}. |
| * |
| * @param expression The {@link ArithmeticFactor parsed object} representing an arithmetic |
| * factor expression |
| */ |
| public void setExpression(ArithmeticFactor expression) { |
| super.setExpression(expression); |
| } |
| |
| /** |
| * Returns the {@link StateObject} that represents the arithmetic primary expression. |
| * |
| * @param stateObject The {@link StateObject} that represents the arithmetic primary expression |
| * or <code>null</code> if none was specified |
| */ |
| public void setStateObject(StateObject stateObject) { |
| StateObject oldStateObject = this.stateObject; |
| this.stateObject = parent(stateObject); |
| firePropertyChanged(STATE_OBJECT_PROPERTY, oldStateObject, stateObject); |
| } |
| |
| /** |
| * Toggles the arithmetic sign, plus becomes minus and vice versa. |
| */ |
| public void toggleArithmeticSign() { |
| setArithmeticSign(!plusSign); |
| } |
| |
| @Override |
| protected void toTextInternal(Appendable writer) throws IOException { |
| writer.append(getArithmeticSign()); |
| if (stateObject != null) { |
| writer.append(SPACE); |
| stateObject.toString(writer); |
| } |
| } |
| } |