| /* |
| * Copyright (c) 2012, 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.Collection; |
| import java.util.List; |
| import org.eclipse.persistence.jpa.jpql.WordParser; |
| |
| /** |
| * The <b>REGEXP</b> condition is used to specify a search for a pattern. It is not part of JPA |
| * 2.0/2.1, only EclipseLink. It is supported by many databases (Oracle, MySQL, PostgreSQL), I |
| * think part of SQL 2008, replacing <b>SIMILAR TO</b>. |
| * <p> |
| * The <code>string_expression</code> must have a string value. The <code>pattern_value</code> is a |
| * string literal or a string-valued input parameter that is a regular expression. |
| * |
| * <div><b>BNF:</b> <code>regexp_expression ::= string_expression REGEXP pattern_value</code></div> |
| * |
| * @version 2.5 |
| * @since 2.4 |
| * @author James Sutherland |
| */ |
| public final class RegexpExpression extends AbstractExpression { |
| |
| /** |
| * Determines whether a whitespace was parsed after <b>REGEXP</b>. |
| */ |
| private boolean hasSpaceAfterIdentifier; |
| |
| /** |
| * The {@link Expression} representing the pattern value. |
| */ |
| private AbstractExpression patternValue; |
| |
| /** |
| * The actual <b>REGEXP</b> identifier found in the string representation of the JPQL query. |
| */ |
| private String regexpIdentifier; |
| |
| /** |
| * The {@link Expression} representing the string expression. |
| */ |
| private AbstractExpression stringExpression; |
| |
| /** |
| * Creates a new <code>LikeExpression</code>. |
| * |
| * @param parent The parent of this expression |
| * @param stringExpression The first part of this expression, which is the string expression |
| */ |
| public RegexpExpression(AbstractExpression parent, AbstractExpression stringExpression) { |
| super(parent, REGEXP); |
| |
| if (stringExpression != null) { |
| this.stringExpression = stringExpression; |
| this.stringExpression.setParent(this); |
| } |
| } |
| |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| acceptUnknownVisitor(visitor); |
| } |
| |
| @Override |
| public void acceptChildren(ExpressionVisitor visitor) { |
| getStringExpression().accept(visitor); |
| getPatternValue().accept(visitor); |
| } |
| |
| @Override |
| protected void addChildrenTo(Collection<Expression> children) { |
| children.add(getStringExpression()); |
| children.add(getPatternValue()); |
| } |
| |
| @Override |
| protected void addOrderedChildrenTo(List<Expression> children) { |
| |
| // String expression |
| if (stringExpression != null) { |
| children.add(stringExpression); |
| children.add(buildStringExpression(SPACE)); |
| } |
| |
| // 'REGEXP' |
| children.add(buildStringExpression(REGEXP)); |
| |
| if (hasSpaceAfterIdentifier) { |
| children.add(buildStringExpression(SPACE)); |
| } |
| |
| // Pattern value |
| if (patternValue != null) { |
| children.add(patternValue); |
| } |
| } |
| |
| @Override |
| public JPQLQueryBNF findQueryBNF(Expression expression) { |
| |
| if ((stringExpression != null) && stringExpression.isAncestor(expression)) { |
| return getQueryBNF(StringExpressionBNF.ID); |
| } |
| |
| if ((patternValue != null) && patternValue.isAncestor(expression)) { |
| return getQueryBNF(PatternValueBNF.ID); |
| } |
| |
| return super.findQueryBNF(expression); |
| } |
| |
| /** |
| * Returns the actual <b>REGEXP</b> found in the string representation of the JPQL query, which |
| * has the actual case that was used. |
| * |
| * @return The <b>REGEXP</b> identifier that was actually parsed |
| */ |
| public String getActualRegexpIdentifier() { |
| return regexpIdentifier; |
| } |
| |
| /** |
| * Returns the {@link Expression} that represents the pattern value. |
| * |
| * @return The expression that was parsed representing the pattern value |
| */ |
| public Expression getPatternValue() { |
| if (patternValue == null) { |
| patternValue = buildNullExpression(); |
| } |
| return patternValue; |
| } |
| |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(RegexpExpressionBNF.ID); |
| } |
| |
| /** |
| * Returns the {@link Expression} that represents the string expression. |
| * |
| * @return The expression that was parsed representing the string expression |
| */ |
| public Expression getStringExpression() { |
| if (stringExpression == null) { |
| stringExpression = buildNullExpression(); |
| } |
| return stringExpression; |
| } |
| |
| /** |
| * Determines whether the pattern value was parsed. |
| * |
| * @return <code>true</code> if the pattern value was parsed; <code>false</code> otherwise |
| */ |
| public boolean hasPatternValue() { |
| return patternValue != null && |
| !patternValue.isNull(); |
| } |
| |
| /** |
| * Determines whether a whitespace was parsed after <b>REGEXP</b>. |
| * |
| * @return <code>true</code> if there was a whitespace after <b>REGEXP</b>; <code>false</code> |
| * otherwise |
| */ |
| public boolean hasSpaceAfterIdentifier() { |
| return hasSpaceAfterIdentifier; |
| } |
| |
| /** |
| * Determines whether a whitespace was parsed after the string expression. |
| * |
| * @return <code>true</code> if there was a whitespace after the string expression; |
| * <code>false</code> otherwise |
| */ |
| public boolean hasSpaceAfterStringExpression() { |
| return hasStringExpression(); |
| } |
| |
| /** |
| * Determines whether the string expression was parsed. |
| * |
| * @return <code>true</code> if the string expression was parsed; <code>false</code> otherwise |
| */ |
| public boolean hasStringExpression() { |
| return stringExpression != null && |
| !stringExpression.isNull(); |
| } |
| |
| @Override |
| protected boolean isParsingComplete(WordParser wordParser, String word, Expression expression) { |
| |
| char character = word.charAt(0); |
| |
| if (getQueryBNF(PatternValueBNF.ID).handleAggregate() && |
| (character == '+' || character == '-' || character == '*' || character == '/')) { |
| |
| return false; |
| } |
| |
| return super.isParsingComplete(wordParser, word, expression) || |
| word.equalsIgnoreCase(AND) || |
| word.equalsIgnoreCase(OR) || |
| expression != null; |
| } |
| |
| @Override |
| protected void parse(WordParser wordParser, boolean tolerant) { |
| |
| // Parse 'REGEXP' |
| regexpIdentifier = wordParser.moveForward(REGEXP); |
| |
| hasSpaceAfterIdentifier = wordParser.skipLeadingWhitespace() > 0; |
| |
| // Parse the pattern value |
| patternValue = parse(wordParser, PatternValueBNF.ID, tolerant); |
| } |
| |
| @Override |
| protected void toParsedText(StringBuilder writer, boolean actual) { |
| |
| // String expression |
| if (stringExpression != null) { |
| stringExpression.toParsedText(writer, actual); |
| writer.append(SPACE); |
| } |
| |
| // 'REGEXP' |
| writer.append(actual ? regexpIdentifier : REGEXP); |
| |
| if (hasSpaceAfterIdentifier) { |
| writer.append(SPACE); |
| } |
| |
| // Pattern value |
| if (patternValue != null) { |
| patternValue.toParsedText(writer, actual); |
| } |
| } |
| } |