| /* |
| * 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 org.eclipse.persistence.jpa.jpql.ExpressionTools; |
| import org.eclipse.persistence.jpa.jpql.parser.EncapsulatedIdentificationVariableExpression; |
| import org.eclipse.persistence.jpa.jpql.parser.IdentificationVariableBNF; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedType; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IType; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.ITypeDeclaration; |
| |
| /** |
| * This object represents an identification variable that is wrapped by a function. |
| * |
| * <div><p><b>BNF:</b> <code><identifier>(identification_variable)</code></p></div> |
| * |
| * @see EncapsulatedIdentificationVariableExpression |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings("nls") |
| public abstract class EncapsulatedIdentificationVariableExpressionStateObject extends AbstractSingleEncapsulatedExpressionStateObject { |
| |
| /** |
| * The cached identification variable that is used to make sure it's the same as the one stored |
| * in the {@link IdentificationVariableStateObject} itself. |
| */ |
| private String identificationVariable; |
| |
| /** |
| * The {@link IManagedType} mapped to the identification variable if the identification variable |
| * maps to an entity name. |
| */ |
| private IManagedType managedType; |
| |
| /** |
| * The cached {@link IType} of the value to resolve. |
| */ |
| private IType type; |
| |
| /** |
| * The cached {@link ITypeDeclaration} of the value to resolve. |
| */ |
| private ITypeDeclaration typeDeclaration; |
| |
| /** |
| * Notifies the identification variable property has changed. |
| */ |
| public static final String IDENTIFICATION_VARIABLE_PROPERTY = "identificationVariable"; |
| |
| /** |
| * Creates a new <code>EncapsulatedIdentificationVariableExpressionStateObject</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 EncapsulatedIdentificationVariableExpressionStateObject(StateObject parent) { |
| super(parent); |
| } |
| |
| /** |
| * Creates a new <code>EncapsulatedIdentificationVariableExpressionStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param identificationVariable The identification variable |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| protected EncapsulatedIdentificationVariableExpressionStateObject(StateObject parent, |
| String identificationVariable) { |
| |
| super(parent); |
| setIdentificationVariable(identificationVariable); |
| } |
| |
| /** |
| * Makes sure the cached identification variable and the one owned by {@link |
| * IdentificationVariableStateObject} are the same. If they are not, then clears the cached |
| * values related to the type. |
| */ |
| protected void checkIntegrity() { |
| if (ExpressionTools.stringsAreDifferentIgnoreCase(identificationVariable, getStateObject().getText())) { |
| clearResolvedObjects(); |
| identificationVariable = getStateObject().getText(); |
| } |
| } |
| |
| /** |
| * Clears the values related to the managed type and type. |
| */ |
| protected void clearResolvedObjects() { |
| type = null; |
| managedType = null; |
| typeDeclaration = null; |
| } |
| |
| @Override |
| public EncapsulatedIdentificationVariableExpression getExpression() { |
| return (EncapsulatedIdentificationVariableExpression) super.getExpression(); |
| } |
| |
| /** |
| * Returns the identification variable. |
| * |
| * @return The name of the identification variable |
| */ |
| public String getIdentificationVariable() { |
| identificationVariable = getStateObject().getText(); |
| return identificationVariable; |
| } |
| |
| /** |
| * 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) { |
| checkIntegrity(); |
| } |
| |
| if (managedType == null) { |
| managedType = resolveManagedType(); |
| } |
| |
| return managedType; |
| } |
| |
| @Override |
| protected String getQueryBNFId() { |
| return IdentificationVariableBNF.ID; |
| } |
| |
| @Override |
| public IdentificationVariableStateObject getStateObject() { |
| return (IdentificationVariableStateObject) super.getStateObject(); |
| } |
| |
| /** |
| * Returns the {@link IType} of the field handled by this object. |
| * |
| * @return Either the {@link IType} of the identification variable or the {@link IType} for |
| * {@link IType#UNRESOLVABLE_TYPE} if it could not be resolved |
| */ |
| public IType getType() { |
| |
| if (type != null) { |
| checkIntegrity(); |
| } |
| |
| 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) { |
| checkIntegrity(); |
| } |
| |
| if (typeDeclaration == null) { |
| typeDeclaration = resolveTypeDeclaration(); |
| } |
| |
| return typeDeclaration; |
| } |
| |
| /** |
| * Determines whether the identification variable has been defined or not. |
| * |
| * @return <code>true</code> if the identification variable has been defined; |
| * <code>false</code> otherwise |
| */ |
| public boolean hasIdentificationVariable() { |
| return ExpressionTools.stringIsNotEmpty(getIdentificationVariable()); |
| } |
| |
| @Override |
| protected void initialize() { |
| super.initialize(); |
| setStateObject(new IdentificationVariableStateObject(this)); |
| } |
| |
| /** |
| * 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 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 getStateObject().getTypeDeclaration(); |
| } |
| |
| /** |
| * Sets the identification variable of this encapsulated expression. |
| * |
| * @param identificationVariable The name of the identification variable |
| */ |
| public void setIdentificationVariable(String identificationVariable) { |
| |
| clearResolvedObjects(); |
| |
| String oldIdentificationVariable = this.identificationVariable; |
| this.identificationVariable = identificationVariable; |
| getStateObject().setText(identificationVariable); |
| firePropertyChanged(IDENTIFICATION_VARIABLE_PROPERTY, oldIdentificationVariable, identificationVariable); |
| } |
| } |