/*******************************************************************************
* Copyright (c) 2006, 2012 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 v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation
*
******************************************************************************/
package org.eclipse.persistence.jpa.internal.jpql.parser;
import java.util.Collection;
import java.util.List;
import org.eclipse.persistence.jpa.internal.jpql.WordParser;
import org.eclipse.persistence.jpa.jpql.ExpressionTools;
/**
* The <code>state_field_path_expression</code> must have a string, numeric, or enum value. The
* literal and/or <code>input_parameter</code> values must be like the same abstract schema type of
* the <code>state_field_path_expression</code> in type.
* <p>
* The results of the <code>subquery</code> must be like the same abstract schema type of the
* <code>state_field_path_expression</code> in type.
* <p>
* There must be at least one element in the comma separated list that defines the set of values for
* the <b>IN</b> expression. If the value of a <code>state_field_path_expression</code> in an
* <b>IN</b> or <b>NOT IN</b> expression is <b>NULL</b> or unknown, the value of the expression is
* unknown.
* <p>
* JPA 1.0:
* <div nowrap><b>BNF:</b> <code>in_expression ::= state_field_path_expression [NOT] IN(in_item {, in_item}* | subquery)</code><p>
* JPA 2.0
* <div nowrap><b>BNF:</b> <code>in_expression ::= {state_field_path_expression | type_discriminator} [NOT] IN { ( in_item {, in_item}* ) | (subquery) | collection_valued_input_parameter }</code><p>
* <p>
* <div nowrap>Example: </code><b>SELECT</b> c <b>FROM</b> Customer c <b>WHERE</b> c.home.city <b>IN</b>(:city)</p>
* <p>
* <div nowrap>Example: </code><b>SELECT</b> p <b>FROM</b> Project p <b>WHERE</b> <b>TYPE</b>(p) <b>IN</b>(LargeProject, SmallProject)</p>
*
* @version 2.3.0
* @since 2.3.3
* @author Pascal Filion
*/
public final class InExpression extends AbstractExpression {
/**
* The expression before the 'IN' identifier used for identification.
*/
private AbstractExpression expression;
/**
* Flag used to determine if the closing parenthesis is present in the query.
*/
private boolean hasLeftParenthesis;
/**
* Determines whether this expression is negated or not.
*/
private boolean hasNot;
/**
* Flag used to determine if the opening parenthesis is present in the query.
*/
private boolean hasRightParenthesis;
/**
* The expression within parenthesis, which can be one or many expressions.
*/
private AbstractExpression inItems;
/**
* Determines whether what was parsed after the <code>IN</code> identifier is a single input
* parameter.
*/
private Boolean singleInputParameter;
/**
* Creates a new <code>InExpression</code>.
*
* @param parent The parent of this expression
* @param expression The state field path expression that was parsed prior of parsing this
* expression
*/
InExpression(AbstractExpression parent, AbstractExpression expression) {
super(parent, IN);
if (expression != null) {
this.expression = expression;
this.expression.setParent(this);
}
}
/**
* {@inheritDoc}
*/
public void accept(ExpressionVisitor visitor) {
visitor.visit(this);
}
/**
* {@inheritDoc}
*/
public void acceptChildren(ExpressionVisitor visitor) {
getExpression().accept(visitor);
getInItems().accept(visitor);
}
/**
* {@inheritDoc}
*/
@Override
void addChildrenTo(Collection<Expression> children) {
children.add(getExpression());
children.add(getInItems());
}
/**
* {@inheritDoc}
*/
@Override
void addOrderedChildrenTo(List<StringExpression> children) {
// State field path expression or type discriminator
if (expression != null) {
children.add(expression);
}
// 'NOT'
if (hasNot) {
children.add(buildStringExpression(SPACE));
children.add(buildStringExpression(NOT));
}
else if (hasExpression()) {
children.add(buildStringExpression(SPACE));
}
// 'IN'
children.add(buildStringExpression(IN));
// '('
if (hasLeftParenthesis) {
children.add(buildStringExpression(LEFT_PARENTHESIS));
}
else if (hasInItems()) {
children.add(buildStringExpression(SPACE));
}
// In items
if (inItems != null) {
children.add(inItems);
}
// ')'
if (hasRightParenthesis) {
children.add(buildStringExpression(RIGHT_PARENTHESIS));
}
}
/**
* {@inheritDoc}
*/
@Override
public JPQLQueryBNF findQueryBNF(AbstractExpression expression) {
if (this.expression == expression) {
return queryBNF(InExpressionExpressionBNF.ID);
}
if (inItems.isAncestor(expression)) {
return queryBNF(InItemBNF.ID);
}
return super.findQueryBNF(expression);
}
/**
* Returns the {@link Expression} that represents the state field path expression or type
* discriminator.
*
* @return The expression that was parsed representing the state field path expression or the
* type discriminator
*/
public Expression getExpression() {
if (expression == null) {
expression = buildNullExpression();
}
return expression;
}
/**
* Returns the identifier for this expression.
*
* @return Either <b>IS IN</b> or <b>IN</b>
*/
public String getIdentifier() {
return hasNot ? NOT_IN : IN;
}
/**
* Returns the {@link Expression} that represents the list if items.
*
* @return The expression that was parsed representing the list of items
*/
public Expression getInItems() {
if (inItems == null) {
inItems = buildNullExpression();
}
return inItems;
}
/**
* {@inheritDoc}
*/
@Override
public JPQLQueryBNF getQueryBNF() {
return queryBNF(InExpressionBNF.ID);
}
/**
* Determines whether the state field path expression or type discriminator was parsed.
*
* @return <code>true</code> if the state field path expression or type discriminator was parsed;
* <code>false</code> if it was not parsed
*/
public boolean hasExpression() {
return expression != null &&
!expression.isNull();
}
/**
* Determines whether the list of items was parsed.
*
* @return <code>true</code> if at least one item was parsed; <code>false</code>
* otherwise
*/
public boolean hasInItems() {
return inItems != null &&
!inItems.isNull();
}
/**
* Determines whether the open parenthesis was parsed or not.
*
* @return <code>true</code> if the open parenthesis was present in the string version of the
* query; <code>false</code> otherwise
*/
public boolean hasLeftParenthesis() {
return hasLeftParenthesis;
}
/**
* Determines whether the identifier <b>NOT</b> was parsed.
*
* @return <code>true</code> if the identifier <b>NOT</b> was parsed; <code>false</code> otherwise
*/
public boolean hasNot() {
return hasNot;
}
/**
* Determines whether the close parenthesis was parsed or not.
*
* @return <code>true</code> if the close parenthesis was present in the string version of the
* query; <code>false</code> otherwise
*/
public boolean hasRightParenthesis() {
return hasRightParenthesis;
}
/**
* Determines whether what was parsed after the <code>IN</code> identifier is a single input
* parameter:
* <div nowrap><b>BNF:</b> <code>in_expression ::= {state_field_path_expression | type_discriminator} [NOT] IN collection_valued_input_parameter</code><p>
*
* @since 2.3.3
*/
public boolean isSingleInputParameter() {
if (singleInputParameter == null) {
if (hasLeftParenthesis || hasRightParenthesis) {
singleInputParameter = Boolean.FALSE;
}
else {
WordParser wordParser = new WordParser(getInItems().toActualText());
String word = wordParser.word();
wordParser.moveForward(word);
singleInputParameter = (word.length() > 0) &&
ExpressionTools.isParameter(word.charAt(0)) &&
wordParser.isTail();
}
}
return singleInputParameter;
}
/**
* {@inheritDoc}
*/
@Override
void parse(WordParser wordParser, boolean tolerant) {
// Parse 'NOT'
hasNot = wordParser.startsWithIgnoreCase('N');
if (hasNot) {
wordParser.moveForward(NOT);
wordParser.skipLeadingWhitespace();
}
// Parse 'IN'
wordParser.moveForward(IN);
int count = wordParser.skipLeadingWhitespace();
// Parse '('
hasLeftParenthesis = wordParser.startsWith(LEFT_PARENTHESIS);
if (hasLeftParenthesis) {
wordParser.moveForward(1);
count = wordParser.skipLeadingWhitespace();
}
// Parse the in items or sub-query
inItems = parse(
wordParser,
queryBNF(InItemBNF.ID),
tolerant
);
if (hasInItems()) {
count = wordParser.skipLeadingWhitespace();
}
// Parse ')'
hasRightParenthesis = wordParser.startsWith(RIGHT_PARENTHESIS);
if (hasRightParenthesis) {
wordParser.moveForward(1);
}
else {
wordParser.moveBackward(count);
}
}
/**
* {@inheritDoc}
*/
@Override
void toParsedText(StringBuilder writer, boolean includeVirtual) {
// State field path expression or type discriminator
if (hasExpression()) {
expression.toParsedText(writer, includeVirtual);
}
if (hasExpression()) {
writer.append(SPACE);
}
// 'IN'
if (hasNot) {
writer.append(NOT);
writer.append(SPACE);
}
// 'IN'
writer.append(IN);
// '('
if (hasLeftParenthesis) {
writer.append(LEFT_PARENTHESIS);
}
else if (hasInItems()) {
writer.append(SPACE);
}
// IN items
if (hasInItems()) {
inItems.toParsedText(writer, includeVirtual);
}
// ')'
if (hasRightParenthesis) {
writer.append(RIGHT_PARENTHESIS);
}
}
}