| /* |
| * 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.CompoundExpression; |
| import static org.eclipse.persistence.jpa.jpql.parser.AbstractExpression.*; |
| |
| /** |
| * A compound {@link StateObject} has a left and right expressions combined by an identifier. |
| * |
| * <div><p><b>BNF:</b> <code>expression ::= left_expression <identifier> right_expression</code></p></div> |
| * |
| * @see CompoundExpression |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings("nls") |
| public abstract class CompoundExpressionStateObject extends AbstractStateObject { |
| |
| /** |
| * The {@link StateObject} representing the left expression. |
| */ |
| private StateObject leftStateObject; |
| |
| /** |
| * The {@link StateObject} representing the right expression. |
| */ |
| private StateObject rightStateObject; |
| |
| /** |
| * Notifies the left state object property has changed. |
| */ |
| public static final String LEFT_STATE_OBJECT_PROPERTY = "leftStateObject"; |
| |
| /** |
| * Notifies the right state object property has changed. |
| */ |
| public static final String RIGHT_STATE_OBJECT_PROPERTY = "rightStateObject"; |
| |
| /** |
| * Creates a new <code>CompoundExpressionStateObject</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 CompoundExpressionStateObject(StateObject parent) { |
| super(parent); |
| } |
| |
| /** |
| * Creates a new <code>ArithmeticExpressionStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param leftStateObject The {@link StateObject} representing the left expression |
| * @param rightStateObject The {@link StateObject} representing the right expression |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| protected CompoundExpressionStateObject(StateObject parent, |
| StateObject leftStateObject, |
| StateObject rightStateObject) { |
| super(parent); |
| this.leftStateObject = parent(leftStateObject); |
| this.rightStateObject = parent(rightStateObject); |
| } |
| |
| /** |
| * Creates a new <code>ArithmeticExpressionStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param leftJpqlFragment The string representation of the left expression to parse and to |
| * convert into a {@link StateObject} |
| * @param rightJpqlFragment The string representation of the right expression to parse and to |
| * convert into a {@link StateObject} |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| protected CompoundExpressionStateObject(StateObject parent, |
| String leftJpqlFragment, |
| String rightJpqlFragment) { |
| |
| super(parent); |
| parseLeft (leftJpqlFragment); |
| parseRight(rightJpqlFragment); |
| } |
| |
| @Override |
| protected void addChildren(List<StateObject> children) { |
| super.addChildren(children); |
| if (leftStateObject != null) { |
| children.add(leftStateObject); |
| } |
| if (rightStateObject != null) { |
| children.add(rightStateObject); |
| } |
| } |
| |
| @Override |
| public CompoundExpression getExpression() { |
| return (CompoundExpression) super.getExpression(); |
| } |
| |
| /** |
| * Returns the identifier joining the two {@link StateObject StateObjects}. |
| * |
| * @return The JPQL identifier join two expressions |
| */ |
| public abstract String getIdentifier(); |
| |
| /** |
| * Returns the {@link StateObject} that represents the left expression. |
| * |
| * @return The {@link StateObject} representing the left expression |
| */ |
| public StateObject getLeft() { |
| return leftStateObject; |
| } |
| |
| /** |
| * Returns the unique identifier of the BNF that will be used to parse a JPQL fragment as the |
| * left side of the expression. |
| * |
| * @return The query BNF ID for the left side of the expression |
| */ |
| protected abstract String getLeftQueryBNFId(); |
| |
| /** |
| * Returns the {@link StateObject} that represents the right expression. |
| * |
| * @return The {@link StateObject} representing the right expression |
| */ |
| public StateObject getRight() { |
| return rightStateObject; |
| } |
| |
| /** |
| * Returns the unique identifier of the BNF that will be used to parse a JPQL fragment as the |
| * right side of the expression. |
| * |
| * @return The query BNF ID for the right side of the expression |
| */ |
| protected abstract String getRightQueryBNFId(); |
| |
| /** |
| * Determines whether there is a {@link StateObject} that represents the left expression. |
| * |
| * @return <code>true</code> if there is a left {@link StateObject}; <code>false</code> if it is |
| * <code>null</code> |
| */ |
| public boolean hasLeft() { |
| return leftStateObject != null; |
| } |
| |
| /** |
| * Determines whether there is a {@link StateObject} that represents the right expression. |
| * |
| * @return <code>true</code> if there is a right {@link StateObject}; <code>false</code> if it |
| * is <code>null</code> |
| */ |
| public boolean hasRight() { |
| return rightStateObject != null; |
| } |
| |
| @Override |
| public boolean isEquivalent(StateObject stateObject) { |
| |
| if (super.isEquivalent(stateObject)) { |
| CompoundExpressionStateObject compound = (CompoundExpressionStateObject) stateObject; |
| return areEquivalent(leftStateObject, compound.leftStateObject) && |
| areEquivalent(rightStateObject, compound.rightStateObject); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Parses the given JPQL fragment and update the left side of the compound expression. |
| * |
| * @param jpqlFragment The portion of the query to become the left side of the compound expression |
| */ |
| public void parseLeft(String jpqlFragment) { |
| StateObject stateObject = buildStateObject(jpqlFragment, getLeftQueryBNFId()); |
| setLeft(stateObject); |
| } |
| |
| /** |
| * Parses the given JPQL fragment and update the right side of the compound expression. |
| * |
| * @param jpqlFragment The portion of the query to become the right side of the compound expression |
| */ |
| public void parseRight(String jpqlFragment) { |
| StateObject stateObject = buildStateObject(jpqlFragment, getRightQueryBNFId()); |
| setLeft(stateObject); |
| } |
| |
| /** |
| * Sets the left {@link StateObject} to become the given object. |
| * |
| * @param leftStateObject The {@link StateObject} representing the left expression |
| */ |
| public void setLeft(StateObject leftStateObject) { |
| StateObject oldLeftStateObject = this.leftStateObject; |
| this.leftStateObject = parent(leftStateObject); |
| firePropertyChanged(LEFT_STATE_OBJECT_PROPERTY, oldLeftStateObject, leftStateObject); |
| } |
| |
| /** |
| * Sets the right {@link StateObject} to become the given object. |
| * |
| * @param rightStateObject The {@link StateObject} representing the right expression |
| */ |
| public void setRight(StateObject rightStateObject) { |
| StateObject oldRightStateObject = this.rightStateObject; |
| this.rightStateObject = parent(rightStateObject); |
| firePropertyChanged(RIGHT_STATE_OBJECT_PROPERTY, oldRightStateObject, rightStateObject); |
| } |
| |
| @Override |
| protected void toTextInternal(Appendable writer) throws IOException { |
| |
| if (leftStateObject != null) { |
| leftStateObject.toString(writer); |
| } |
| |
| writer.append(SPACE); |
| writer.append(getIdentifier()); |
| writer.append(SPACE); |
| |
| if (rightStateObject != null) { |
| rightStateObject.toString(writer); |
| } |
| } |
| } |