Examples of org.eclipse.persistence.jpa.jpql.LiteralVisitor

Package org.eclipse.persistence.jpa.jpql

Examples of org.eclipse.persistence.jpa.jpql.LiteralVisitor

org.eclipse.persistence.jpa.jpql.LiteralVisitor
This visitor traverses an {@link org.eclipse.persistence.jpa.jpql.parser.Expression Expression}and retrieves the "literal" value. The literal to retrieve depends on the {@link LiteralType type}. The literal is basically a string value like an identification variable name, an input parameter, a path expression, an abstract schema name, etc.
Provisional API: This interface is part of an interim API that is still under development and expected to change significantly before reaching stability. It is available at this early stage to solicit feedback from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken (repeatedly) as the API evolves. @version 2.4 @since 2.4 @author Pascal Filion

   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  String literal(org.eclipse.persistence.jpa.jpql.parser.Expression expression, LiteralType type) {


    LiteralVisitor visitor = literalVisitor();


    try {
      visitor.setType(type);
      expression.accept(visitor);


      // Make sure the identification variable is capitalized and unique since
      // String.equals() is used rather than String.equalsIgnoreCase()
      if (visitor.literal != ExpressionTools.EMPTY_STRING &&

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   * {@link Expression}
   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  protected String literal(Expression expression, LiteralType type) {
    LiteralVisitor visitor = getLiteralVisitor();
    try {
      visitor.setType(type);
      visitor.literal = null;
      expression.accept(visitor);
      return visitor.literal;
    }
    finally {

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   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  String literal(org.eclipse.persistence.jpa.jpql.parser.Expression expression, LiteralType type) {


    LiteralVisitor visitor = literalVisitor();


    try {
      visitor.setType(type);
      expression.accept(visitor);


      // Make sure the identification variable is capitalized and unique since
      // String.equals() is used rather than String.equalsIgnoreCase()
      if (visitor.literal != ExpressionTools.EMPTY_STRING &&

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   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  String literal(org.eclipse.persistence.jpa.jpql.parser.Expression expression, LiteralType type) {


    LiteralVisitor visitor = literalVisitor();


    try {
      visitor.setType(type);
      expression.accept(visitor);


      // Make sure the identification variable is capitalized and unique since
      // String.equals() is used rather than String.equalsIgnoreCase()
      if (visitor.literal != ExpressionTools.EMPTY_STRING &&

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   * {@link Expression}
   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  protected String literal(Expression expression, LiteralType type) {
    LiteralVisitor visitor = getLiteralVisitor();
    try {
      visitor.setType(type);
      visitor.literal = null;
      expression.accept(visitor);
      return visitor.literal;
    }
    finally {

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   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  String literal(org.eclipse.persistence.jpa.jpql.parser.Expression expression, LiteralType type) {


    LiteralVisitor visitor = literalVisitor();


    try {
      visitor.setType(type);
      expression.accept(visitor);


      // Make sure the identification variable is capitalized and unique since
      // String.equals() is used rather than String.equalsIgnoreCase()
      if (visitor.literal != ExpressionTools.EMPTY_STRING &&

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   * {@link Expression}
   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  protected String literal(Expression expression, LiteralType type) {
    LiteralVisitor visitor = getLiteralVisitor();
    try {
      visitor.setType(type);
      visitor.literal = null;
      expression.accept(visitor);
      return visitor.literal;
    }
    finally {

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   * {@link Expression}
   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  protected String literal(Expression expression, LiteralType type) {
    LiteralVisitor visitor = getLiteralVisitor();
    try {
      visitor.setType(type);
      visitor.literal = null;
      expression.accept(visitor);
      return visitor.literal;
    }
    finally {

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   * {@link Expression}
   * @return A value from the given {@link Expression} or an empty string if the given {@link
   * Expression} and the {@link LiteralType} do not match
   */
  public String literal(Expression expression, LiteralType type) {
    LiteralVisitor visitor = getLiteralVisitor();
    try {
      visitor.setType(type);
      expression.accept(visitor);
      return visitor.literal;
    }
    finally {
      visitor.literal = ExpressionTools.EMPTY_STRING;

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Related Classes of org.eclipse.persistence.jpa.jpql.LiteralVisitor

org.eclipse.persistence.internal.jpa.jpql.JPQLQueryContext

org.eclipse.persistence.jpa.jpql.model.BasicStateObjectBuilder

org.eclipse.persistence.jpa.jpql.tools.JPQLQueryContext

org.eclipse.persistence.jpa.jpql.tools.model.BasicStateObjectBuilder

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