| /* |
| * 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.Assert; |
| import org.eclipse.persistence.jpa.jpql.parser.JPQLExpression; |
| import org.eclipse.persistence.jpa.jpql.parser.JPQLGrammar; |
| import org.eclipse.persistence.jpa.jpql.tools.model.IJPQLQueryBuilder; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedTypeProvider; |
| |
| /** |
| * This is the root of the {@link StateObject} hierarchy that represents a JPQL query. The only |
| * child of this state object is one of the three possible query statements. |
| * |
| * @see DeleteStatementStateObject |
| * @see SelectStatementStateObject |
| * @see UpdateStatementStateObject |
| * @see org.eclipse.persistence.jpa.jpql.parser.JPQLExpression JPQLExpression |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings("nls") |
| public class JPQLQueryStateObject extends AbstractStateObject { |
| |
| /** |
| * The external form of a provider that gives access to the JPA metadata. |
| */ |
| private IManagedTypeProvider provider; |
| |
| /** |
| * The builder that can create any {@link StateObject} for any given JPQL fragment. |
| */ |
| private IJPQLQueryBuilder queryBuilder; |
| |
| /** |
| * One of the possible three statements. |
| */ |
| private StateObject queryStatement; |
| |
| /** |
| * Notifies the query statement has changed. |
| */ |
| public static final String QUERY_STATEMENT_PROPERTY = "statement"; |
| |
| /** |
| * Creates a new <code>JPQLQueryStateObject</code>. |
| * |
| * @param queryBuilder The builder that can create any {@link StateObject} for any given JPQL |
| * fragment when using a parse method |
| * @param provider The external form of a provider that gives access to the JPA metadata |
| * @exception NullPointerException If one of the given arguments is <code>null</code> |
| */ |
| public JPQLQueryStateObject(IJPQLQueryBuilder queryBuilder, IManagedTypeProvider provider) { |
| super(null); |
| initialize(queryBuilder, provider); |
| } |
| |
| @Override |
| public void accept(StateObjectVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| protected void addChildren(List<StateObject> children) { |
| super.addChildren(children); |
| if (queryStatement != null) { |
| children.add(queryStatement); |
| } |
| } |
| |
| /** |
| * Changes the query statement to be a <code><b>DELETE</b></code> statement. |
| * |
| * @return The new root object of the <code><b>DELETE</b></code> statement |
| */ |
| public DeleteStatementStateObject addDeleteStatement() { |
| DeleteStatementStateObject stateObject = new DeleteStatementStateObject(this); |
| setQueryStatement(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Changes the query statement to be a <code><b>SELECT</b></code> statement. The <code><b>SELECT</b></code> |
| * clause will have the <code><b>DISTINCT</b></code> identifier set. |
| * |
| * @return The new root object of the <code><b>SELECT</b></code> statement |
| */ |
| public SelectStatementStateObject addDistinctSelectStatement() { |
| SelectStatementStateObject stateObject = new SelectStatementStateObject(this); |
| stateObject.getSelectClause().toggleDistinct(); |
| setQueryStatement(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Changes the query statement to be a <code><b>SELECT</b></code> statement. |
| * |
| * @return The new root object of the <code><b>SELECT</b></code> statement |
| */ |
| public SelectStatementStateObject addSelectStatement() { |
| SelectStatementStateObject stateObject = new SelectStatementStateObject(this); |
| setQueryStatement(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Changes the query statement to be a <code><b>SELECT</b></code> statement. |
| * |
| * @param jpqlFragment The portion of the query representing the select items, excluding the |
| * <code><b>SELECT</b></code> identifier |
| * @return The new root object of the <code><b>SELECT</b></code> statement |
| */ |
| public SelectStatementStateObject addSelectStatement(String jpqlFragment) { |
| SelectStatementStateObject stateObject = new SelectStatementStateObject(this); |
| stateObject.getSelectClause().parse(jpqlFragment); |
| setQueryStatement(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Changes the query statement to be a <code><b>UPDATE</b></code> statement. |
| * |
| * @return The new root object of the <code><b>UPDTE</b></code> statement |
| */ |
| public UpdateStatementStateObject addUpdateStatement() { |
| UpdateStatementStateObject stateObject = new UpdateStatementStateObject(this); |
| setQueryStatement(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Changes the query statement to be a <code><b>UPDATE</b></code> statement. |
| * |
| * @param jpqlFragment The portion of the query representing the select items, excluding the |
| * <code><b>UPDATE</b></code> identifier |
| * @return The new root object of the <code><b>UPDATE</b></code> statement |
| */ |
| public UpdateStatementStateObject addUpdateStatement(String jpqlFragment) { |
| UpdateStatementStateObject stateObject = new UpdateStatementStateObject(this); |
| stateObject.getModifyClause().parse(jpqlFragment); |
| setQueryStatement(stateObject); |
| return stateObject; |
| } |
| |
| @Override |
| protected StateObject checkParent(StateObject parent) { |
| return parent; |
| } |
| |
| @Override |
| public DeclarationStateObject getDeclaration() { |
| return (queryStatement == null) ? null : queryStatement.getDeclaration(); |
| } |
| |
| @Override |
| public JPQLExpression getExpression() { |
| return (JPQLExpression) super.getExpression(); |
| } |
| |
| @Override |
| public JPQLGrammar getGrammar() { |
| return queryBuilder.getGrammar(); |
| } |
| |
| @Override |
| public IManagedTypeProvider getManagedTypeProvider() { |
| return provider; |
| } |
| |
| @Override |
| public StateObject getParent() { |
| return null; |
| } |
| |
| @Override |
| public IJPQLQueryBuilder getQueryBuilder() { |
| return queryBuilder; |
| } |
| |
| /** |
| * Returns the only child of this state object, which represents one of the three query statement. |
| * |
| * @return The state object representing the query statement, which was created based on the |
| * query type |
| */ |
| public StateObject getQueryStatement() { |
| return queryStatement; |
| } |
| |
| @Override |
| public JPQLQueryStateObject getRoot() { |
| return this; |
| } |
| |
| /** |
| * Determines whether a query statement has been defined. |
| * |
| * @return <code>true</code> if there is a query statement defined; <code>false</code> otherwise |
| */ |
| public boolean hasQueryStatement() { |
| return queryStatement != null; |
| } |
| |
| /** |
| * Initializes this <code>JPQLQueryStateObject</code>. |
| * |
| * @param queryBuilder The builder that can create any {@link StateObject} for any given JPQL fragment |
| * @param provider The external form that gives access to the JPA metadata |
| * @exception NullPointerException If one of the given arguments is <code>null</code> |
| */ |
| protected void initialize(IJPQLQueryBuilder queryBuilder, IManagedTypeProvider provider) { |
| |
| Assert.isNotNull(queryBuilder, "IJPQLQueryBuilder cannot be null"); |
| Assert.isNotNull(provider, "IManagedTypeProvider cannot be null"); |
| |
| this.provider = provider; |
| this.queryBuilder = queryBuilder; |
| } |
| |
| @Override |
| public boolean isEquivalent(StateObject stateObject) { |
| |
| if (super.isEquivalent(stateObject)) { |
| JPQLQueryStateObject jpqlStateObject = (JPQLQueryStateObject) stateObject; |
| return areEquivalent(queryStatement, jpqlStateObject.queryStatement); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Parses the given JPQL fragment as this state object's query statement. |
| * |
| * @param jpqlFragment The portion of the query to parse |
| * @param queryBNFId The unique identifier of the BNF that determines how to parse the fragment |
| */ |
| public void parse(CharSequence jpqlFragment, String queryBNFId) { |
| StateObject stateObject = buildStateObject(jpqlFragment, queryBNFId); |
| setQueryStatement(stateObject); |
| } |
| |
| /** |
| * Keeps a reference of the {@link JPQLExpression 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 JPQLExpression parsed object} representing the JPQL query |
| */ |
| public void setExpression(JPQLExpression expression) { |
| super.setExpression(expression); |
| } |
| |
| /** |
| * Sets the only child of this state object, which represents one of the three query statement. |
| * |
| * @param queryStatement The state object representing the query statement, which was created |
| * based on the query type |
| */ |
| public void setQueryStatement(StateObject queryStatement) { |
| StateObject oldStatement = this.queryStatement; |
| this.queryStatement = parent(queryStatement); |
| firePropertyChanged(QUERY_STATEMENT_PROPERTY, oldStatement, queryStatement); |
| } |
| |
| @Override |
| protected void toTextInternal(Appendable writer) throws IOException { |
| if (queryStatement != null) { |
| queryStatement.toString(writer); |
| } |
| } |
| } |