| /* |
| * Copyright (c) 2006, 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.parser; |
| |
| import java.util.List; |
| import org.eclipse.persistence.jpa.jpql.WordParser; |
| |
| /** |
| * This {@link Expression} represents a date or time. It supports the following identifiers: |
| * <p> |
| * <b>CURRENT_DATE</b>: This function returns the value of current date on the database server. |
| * <p> |
| * <b>CURRENT_TIME</b>: This function returns the value of current time on the database server. |
| * <p> |
| * <b>CURRENT_TIMESTAMP</b>: This function returns the value of current timestamp on the database |
| * server. |
| * |
| * <div><b>BNF:</b> <code>functions_returning_datetime ::= CURRENT_DATE | CURRENT_TIME | CURRENT_TIMESTAMP</code></div> |
| * <p> |
| * The JDBC escape syntax may be used for the specification of date, time, and timestamp literals. |
| * |
| * <div><b>BNF:</b> <code>expression ::= {d 'yyyy-mm-dd'} | {t 'hh:mm:ss'} | {ts 'yyyy-mm-dd hh:mm:ss.f...'}</code><p></p></div> |
| * |
| * @version 2.4 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public final class DateTime extends AbstractExpression { |
| |
| /** |
| * The actual identifier found in the string representation of the JPQL query. |
| */ |
| private String identifier; |
| |
| /** |
| * Creates a new <code>DateTime</code>. |
| * |
| * @param parent The parent of this expression |
| */ |
| public DateTime(AbstractExpression parent) { |
| super(parent); |
| } |
| |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| public void acceptChildren(ExpressionVisitor visitor) { |
| } |
| |
| @Override |
| protected void addOrderedChildrenTo(List<Expression> children) { |
| children.add(buildStringExpression(getText())); |
| } |
| |
| /** |
| * Returns the actual identifier found in the string representation of the JPQL query, which has |
| * the actual case that was used. |
| * |
| * @return The identifier that was actually parsed |
| */ |
| public String getActualIdentifier() { |
| return identifier; |
| } |
| |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(FunctionsReturningDatetimeBNF.ID); |
| } |
| |
| @Override |
| public String getText() { |
| return super.getText(); |
| } |
| |
| /** |
| * Determines whether this {@link DateTime} represents the JPQL identifier |
| * {@link Expression#CURRENT_DATE CURRENT_DATE}. |
| * |
| * @return <code>true</code> if this {@link Expression} represents |
| * {@link Expression#CURRENT_DATE CURRENT_DATE}; <code>false</code> otherwise |
| */ |
| public boolean isCurrentDate() { |
| return getText() == CURRENT_DATE; |
| } |
| |
| /** |
| * Determines whether this {@link DateTime} represents the JPQL identifier |
| * {@link Expression#CURRENT_TIME CURRENT_TIME}. |
| * |
| * @return <code>true</code> if this {@link Expression} represents |
| * {@link Expression#CURRENT_TIME CURRENT_TIME}; <code>false</code> otherwise |
| */ |
| public boolean isCurrentTime() { |
| return getText() == CURRENT_TIME; |
| } |
| |
| /** |
| * Determines whether this {@link DateTime} represents the JPQL identifier |
| * {@link Expression#CURRENT_TIMESTAMP CURRENT_TIMESTAMP}. |
| * |
| * @return <code>true</code> if this {@link Expression} represents |
| * {@link Expression#CURRENT_TIMESTAMP CURRENT_TIMESTAMP}; <code>false</code> |
| * otherwise |
| */ |
| public boolean isCurrentTimestamp() { |
| return getText() == CURRENT_TIMESTAMP; |
| } |
| |
| /** |
| * Determines whether this {@link DateTime} represents the JDBC escape syntax for date, time, |
| * timestamp formats. |
| * |
| * @return <code>true</code> if this {@link Expression} represents a JDBC escape syntax; |
| * <code>false</code> otherwise |
| */ |
| public boolean isJDBCDate() { |
| return getText().charAt(0) == LEFT_CURLY_BRACKET; |
| } |
| |
| @Override |
| protected void parse(WordParser wordParser, boolean tolerant) { |
| |
| // JDBC escape format for date/time/timestamp |
| if (wordParser.startsWith(LEFT_CURLY_BRACKET)) { |
| parseJDBCEscapeFormat(wordParser); |
| } |
| // JPQL identifiers |
| else { |
| String identifier = parseIdentifier(wordParser); |
| setText(identifier); |
| this.identifier = wordParser.moveForward(identifier); |
| } |
| } |
| |
| private String parseIdentifier(WordParser wordParser) { |
| |
| int position = wordParser.position(); |
| char character = wordParser.character(position + 8); |
| |
| if (character == 'd' || character == 'D') { |
| return CURRENT_DATE; |
| } |
| |
| character = wordParser.character(position + 12); |
| |
| if (character == 's' || character == 'S') { |
| return CURRENT_TIMESTAMP; |
| } |
| |
| return CURRENT_TIME; |
| } |
| |
| private void parseJDBCEscapeFormat(WordParser wordParser) { |
| |
| int startIndex = wordParser.position(); |
| int stopIndex = startIndex + 1; |
| |
| for (int index = startIndex + 1, length = wordParser.length(); index < length; index++) { |
| char character = wordParser.character(index); |
| |
| if (character == RIGHT_CURLY_BRACKET) { |
| stopIndex = index + 1; |
| break; |
| } |
| |
| stopIndex++; |
| } |
| |
| setText(wordParser.substring(startIndex, stopIndex)); |
| wordParser.moveForward(stopIndex - startIndex); |
| } |
| |
| @Override |
| public String toActualText() { |
| return getText(); |
| } |
| |
| @Override |
| public String toParsedText() { |
| return getText(); |
| } |
| |
| @Override |
| protected void toParsedText(StringBuilder writer, boolean actual) { |
| writer.append(actual && !isJDBCDate() ? identifier : getText()); |
| } |
| } |