| /* |
| * 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.ExpressionTools; |
| import org.eclipse.persistence.jpa.jpql.parser.IdentificationVariable; |
| import org.eclipse.persistence.jpa.jpql.tools.model.Problem; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedType; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IMapping; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IType; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.ITypeDeclaration; |
| |
| /** |
| * This state object represents a single identification variable, which is identifying TODO. |
| * |
| * @see IdentificationVariable |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings("nls") |
| public class IdentificationVariableStateObject extends SimpleStateObject { |
| |
| /** |
| * The {@link IManagedType} mapped to the identification variable if the identification variable |
| * maps to an entity name. |
| */ |
| private IManagedType managedType; |
| |
| /** |
| * |
| */ |
| private IMapping mapping; |
| |
| /** |
| * The {@link IType} of the object being mapped to this identification variable. |
| */ |
| private IType type; |
| |
| /** |
| * The {@link ITypeDeclaration} of the object being mapped to this identification variable. |
| */ |
| private ITypeDeclaration typeDeclaration; |
| |
| /** |
| * Determines whether this identification variable is virtual, meaning it's not part of the query |
| * but is required for proper navigability. |
| */ |
| private boolean virtual; |
| |
| /** |
| * Notify a change in the defined property. |
| */ |
| public static final String DEFINED_PROPERTY = "defined"; |
| |
| /** |
| * Creates a new <code>IdentificationVariableStateObject</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> |
| */ |
| public IdentificationVariableStateObject(StateObject parent) { |
| super(parent); |
| } |
| |
| /** |
| * Creates a new <code>IdentificationVariableStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param variable The name of the identification variable |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| public IdentificationVariableStateObject(StateObject parent, String variable) { |
| super(parent, variable); |
| } |
| |
| @Override |
| public void accept(StateObjectVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| protected void addProblems(List<Problem> problems) { |
| super.addProblems(problems); |
| |
| // String text = getText(); |
| |
| // An empty identification variable is never allowed |
| // if (ExpressionTools.stringIsEmpty(text)) { |
| // problems.add(buildProblem(StateObjectProblemConstants.IDENTIFICATION_VARIABLE_STATE_OBJECT_NO_TEXT)); |
| // } |
| // // A JPQL identifier is never allowed |
| // else if (false) { //.isIdentifier(text)) { |
| // problems.add(buildProblem(StateObjectProblemConstants.IDENTIFICATION_VARIABLE_STATE_OBJECT_NOT_DEFINED)); |
| // } |
| // // The identification variable contains some invalid characters |
| // // TODO |
| // |
| // // The variable is not defined in the FROM clause |
| // else if (!defined) { |
| // problems.add(buildProblem(StateObjectProblemConstants.IDENTIFICATION_VARIABLE_STATE_OBJECT_NOT_DEFINED)); |
| // } |
| } |
| |
| /** |
| * Makes sure the current identification variable and the given one are the same. If they are |
| * not, then clears the cached values related to the type. |
| * |
| * @param text The new identification variable |
| */ |
| protected void checkIntegrity(String text) { |
| if (ExpressionTools.valuesAreDifferent(getText(), text)) { |
| clearResolvedObjects(); |
| } |
| } |
| |
| /** |
| * Clears the values related to the managed type and type. |
| */ |
| protected void clearResolvedObjects() { |
| type = null; |
| managedType = null; |
| typeDeclaration = null; |
| } |
| |
| @Override |
| public IdentificationVariable getExpression() { |
| return (IdentificationVariable) super.getExpression(); |
| } |
| |
| /** |
| * Returns the {@link IManagedType} associated with the field handled by this object. If this |
| * object does not handle a field that has a {@link IManagedType}, then <code>null</code> should |
| * be returned. |
| * <p> |
| * For example: "<code><b>SELECT</b> e <b>FROM</b> Employee e</code>", the object for <i>e</i> |
| * would be returning the {@link IManagedType} for <i>Employee</i>. |
| * |
| * @return Either the {@link IManagedType}, if it could be resolved; <code>null</code> otherwise |
| */ |
| public IManagedType getManagedType() { |
| if ((managedType == null) && (mapping == null)) { |
| managedType = resolveManagedType(); |
| } |
| return managedType; |
| } |
| |
| /** |
| * Returns |
| * |
| */ |
| public IMapping getMapping() { |
| if ((managedType == null) && (mapping == null)) { |
| mapping = resolveMapping(); |
| } |
| return mapping; |
| } |
| |
| /** |
| * Returns the {@link IType} of the field handled by this object. |
| * |
| * @return Either the {@link IType} that was resolved by this state object or the {@link IType} |
| * for {@link IType#UNRESOLVABLE_TYPE} if it could not be resolved |
| */ |
| public IType getType() { |
| if (type == null) { |
| type = resolveType(); |
| } |
| return type; |
| } |
| |
| /** |
| * Returns the {@link ITypeDeclaration} of the field handled by this object. |
| * |
| * @return Either the {@link ITypeDeclaration} that was resolved by this object or the {@link |
| * ITypeDeclaration} for {@link IType#UNRESOLVABLE_TYPE} if it could not be resolved |
| */ |
| public ITypeDeclaration getTypeDeclaration() { |
| if (typeDeclaration == null) { |
| typeDeclaration = resolveTypeDeclaration(); |
| } |
| return typeDeclaration; |
| } |
| |
| @Override |
| public boolean isEquivalent(StateObject stateObject) { |
| |
| if (super.isEquivalent(stateObject)) { |
| IdentificationVariableStateObject variable = (IdentificationVariableStateObject) stateObject; |
| return ExpressionTools.stringsAreEqualIgnoreCase(getText(), variable.getText()); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Determines whether this identification variable is virtual, meaning it's not part of the query |
| * but is required for proper navigability. |
| * |
| * @return <code>true</code> if this identification variable was virtually created to fully |
| * qualify path expression; <code>false</code> if it was parsed |
| */ |
| public boolean isVirtual() { |
| return virtual; |
| } |
| |
| /** |
| * Retrieves the {@link IManagedType} that is mapped to the identification variable, if and only |
| * if the identification variable is used to declare an entity. |
| * |
| * @return Either the {@link IManagedType} declared by the identification variable or <code>null</code> |
| * if it could not be resolved |
| */ |
| protected IManagedType resolveManagedType() { |
| return getManagedTypeProvider().getManagedType(getType()); |
| } |
| |
| /** |
| * Resolves |
| * |
| */ |
| protected IMapping resolveMapping() { |
| return null; |
| } |
| |
| /** |
| * Resolves the {@link IType} of the property handled by this object. |
| * |
| * @return Either the {@link IType} that was resolved by this object or the {@link IType} for |
| * {@link IType#UNRESOLVABLE_TYPE} if it could not be resolved |
| */ |
| protected IType resolveType() { |
| return getTypeDeclaration().getType(); |
| } |
| |
| /** |
| * Resolves the {@link ITypeDeclaration} of the property handled by this object. |
| * |
| * @return Either the {@link ITypeDeclaration} that was resolved by this object or the {@link |
| * ITypeDeclaration} for {@link IType#UNRESOLVABLE_TYPE} if it could not be resolved |
| */ |
| protected ITypeDeclaration resolveTypeDeclaration() { |
| return null; |
| } |
| |
| /** |
| * Keeps a reference of the {@link IdentificationVariable 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 IdentificationVariable parsed object} representing an |
| * identification variable |
| */ |
| public void setExpression(IdentificationVariable expression) { |
| super.setExpression(expression); |
| } |
| |
| @Override |
| public void setText(String text) { |
| checkIntegrity(text); |
| super.setText(text); |
| } |
| |
| /** |
| * Sets whether this identification variable is virtual, meaning it's not part of the query but |
| * is required for proper navigability. |
| * |
| * @param virtual <code>true</code> if this identification variable was virtually created to |
| * fully qualify path expression; <code>false</code> if it was parsed |
| */ |
| public void setVirtual(boolean virtual) { |
| this.virtual = virtual; |
| } |
| |
| @Override |
| protected void toTextInternal(Appendable writer) throws IOException { |
| if (!virtual) { |
| super.toTextInternal(writer); |
| } |
| } |
| } |