| /* |
| * 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.AbstractDoubleEncapsulatedExpression; |
| import static org.eclipse.persistence.jpa.jpql.parser.AbstractExpression.*; |
| |
| /** |
| * This {@link StateObject} represents a JPQL expression that has a JPQL identifier followed by |
| * two an encapsulated expression with parenthesis, the two expression are separated by a comma. |
| * |
| * <div><p><b>BNF:</b> <code>expression ::= <identifier>(first_expression, second_expression)</code></p></div> |
| * |
| * @see ModExpressionStateObject |
| * @see NullIfExpressionStateObject |
| * |
| * @see AbstractDoubleEncapsulatedExpression |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings("nls") |
| public abstract class AbstractDoubleEncapsulatedExpressionStateObject extends AbstractEncapsulatedExpressionStateObject { |
| |
| /** |
| * The {@link StateObject} representing the first expression. |
| */ |
| private StateObject firstStateObject; |
| |
| /** |
| * The {@link StateObject} representing the second expression. |
| */ |
| private StateObject secondStateObject; |
| |
| /** |
| * Notifies the first {@link StateObject} property has changed. |
| */ |
| public static final String FIRST_STATE_OBJECT_PROPERTY = "firstStateObject"; |
| |
| /** |
| * Notifies the second {@link StateObject} property has changed. |
| */ |
| public static final String SECOND_STATE_OBJECT_PROPERTY = "secondStateObject"; |
| |
| /** |
| * Creates a new <code>AbstractDoubleEncapsulatedExpressionStateObject</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> |
| */ |
| protected AbstractDoubleEncapsulatedExpressionStateObject(StateObject parent) { |
| super(parent); |
| } |
| |
| /** |
| * Creates a new <code>AbstractDoubleEncapsulatedExpressionStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param firstStateObject The {@link StateObject} representing the first expression |
| * @param secondStateObject The {@link StateObject} representing the second expression |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| protected AbstractDoubleEncapsulatedExpressionStateObject(StateObject parent, |
| StateObject firstStateObject, |
| StateObject secondStateObject) { |
| |
| super(parent); |
| this.firstStateObject = parent(firstStateObject); |
| this.secondStateObject = parent(secondStateObject); |
| } |
| |
| /** |
| * Creates a new <code>AbstractDoubleEncapsulatedExpressionStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param firstJpqlFragment The string representation of the first encapsulated expression to |
| * parse and to convert into a {@link StateObject} representation |
| * @param secondJpqlFragment The string representation of the second encapsulated expression to |
| * parse and to convert into a {@link StateObject} representation |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| public AbstractDoubleEncapsulatedExpressionStateObject(StateObject parent, |
| String firstJpqlFragment, |
| String secondJpqlFragment) { |
| |
| super(parent); |
| parseFirst(firstJpqlFragment); |
| parseSecond(secondJpqlFragment); |
| } |
| |
| @Override |
| protected void addChildren(List<StateObject> children) { |
| |
| super.addChildren(children); |
| |
| if (firstStateObject != null) { |
| children.add(firstStateObject); |
| } |
| |
| if (secondStateObject != null) { |
| children.add(secondStateObject); |
| } |
| } |
| |
| @Override |
| public AbstractDoubleEncapsulatedExpression getExpression() { |
| return (AbstractDoubleEncapsulatedExpression) super.getExpression(); |
| } |
| |
| /** |
| * Returns the {@link StateObject} representing the first expression. |
| * |
| * @return The first encapsulated {@link StateObject} or <code>null</code> if none exists |
| */ |
| public StateObject getFirst() { |
| return firstStateObject; |
| } |
| |
| /** |
| * Returns the unique identifier of the BNF that will be used to parse a JPQL fragment as the |
| * first encapsulated expression. |
| * |
| * @return The query BNF ID for the first encapsulated expression |
| */ |
| protected abstract String getFirstQueryBNFId(); |
| |
| /** |
| * Returns the {@link StateObject} representing the second expression. |
| * |
| * @return The second encapsulated {@link StateObject} or <code>null</code> if none exists |
| */ |
| public StateObject getSecond() { |
| return secondStateObject; |
| } |
| |
| /** |
| * Returns the unique identifier of the BNF that will be used to parse a JPQL fragment as the |
| * second encapsulated expression. |
| * |
| * @return The query BNF ID for the second encapsulated expression |
| */ |
| protected abstract String getSecondQueryBNFId(); |
| |
| /** |
| * Determines whether the {@link StateObject} representing the first encapsulated expression is |
| * present or not. |
| * |
| * @return <code>true</code> if the first {@link StateObject} is not <code>null</code>; |
| * <code>false</code> otherwise |
| */ |
| public boolean hasFirst() { |
| return firstStateObject != null; |
| } |
| |
| /** |
| * Determines whether the {@link StateObject} representing the second encapsulated expression is |
| * present or not. |
| * |
| * @return <code>true</code> if the second {@link StateObject} is not <code>null</code>; |
| * <code>false</code> otherwise |
| */ |
| public boolean hasSecond() { |
| return secondStateObject != null; |
| } |
| |
| @Override |
| public boolean isEquivalent(StateObject stateObject) { |
| |
| if (super.isEquivalent(stateObject)) { |
| AbstractDoubleEncapsulatedExpressionStateObject encapsulated = (AbstractDoubleEncapsulatedExpressionStateObject) stateObject; |
| return areEquivalent(firstStateObject, encapsulated.firstStateObject) && |
| areEquivalent(secondStateObject, encapsulated.secondStateObject); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Parses the given JPQL fragment, which will represent the first encapsulated expression. |
| * |
| * @param jpqlFragment The string representation of the first encapsulated expression to parse and |
| * to convert into a {@link StateObject} representation |
| */ |
| public void parseFirst(String jpqlFragment) { |
| StateObject stateObject = buildStateObject(jpqlFragment, getFirstQueryBNFId()); |
| setFirst(stateObject); |
| } |
| |
| /** |
| * Parses the given JPQL fragment, which will represent the second encapsulated expression. |
| * |
| * @param jpqlFragment The string representation of the second encapsulated expression to parse and |
| * to convert into a {@link StateObject} representation |
| */ |
| public void parseSecond(String jpqlFragment) { |
| StateObject stateObject = buildStateObject(jpqlFragment, getSecondQueryBNFId()); |
| setSecond(stateObject); |
| } |
| |
| /** |
| * Sets the given {@link StateObject} to represent the first encapsulated expression. |
| * |
| * @param firstStateObject The new encapsulated {@link StateObject} representing the first |
| * expression |
| */ |
| public void setFirst(StateObject firstStateObject) { |
| StateObject oldFirstStateObject = this.firstStateObject; |
| this.firstStateObject = parent(firstStateObject); |
| firePropertyChanged(FIRST_STATE_OBJECT_PROPERTY, oldFirstStateObject, firstStateObject); |
| } |
| |
| /** |
| * Sets the given {@link StateObject} to represent the second encapsulated expression. |
| * |
| * @param secondStateObject The new encapsulated {@link StateObject} representing the second |
| * expression |
| */ |
| public void setSecond(StateObject secondStateObject) { |
| StateObject oldSecondStateObject = this.firstStateObject; |
| this.secondStateObject = parent(secondStateObject); |
| firePropertyChanged(SECOND_STATE_OBJECT_PROPERTY, oldSecondStateObject, secondStateObject); |
| } |
| |
| @Override |
| protected void toTextEncapsulatedExpression(Appendable writer) throws IOException { |
| |
| if (firstStateObject != null) { |
| firstStateObject.toString(writer); |
| writer.append(SPACE); |
| } |
| |
| writer.append(COMMA); |
| |
| if (secondStateObject != null) { |
| writer.append(SPACE); |
| secondStateObject.toString(writer); |
| } |
| } |
| } |