package org.kuali.rice.core.api.criteria;

 import org.apache.commons.collections.CollectionUtils;

 import org.apache.commons.lang.StringUtils;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.util.HashSet;

 import java.util.Set;

 /**

  * This is a factory class to construct {@link Predicate Predicates}.

  *

  * <p>

  *    For more readable predicate construction it is recommended that this class

  *    is statically imported.

  * <code>

  *    import static org.kuali.rice.core.api.criteria.PredicateFactory.*;

  * </code>

  * </p>

  *

  * to create a simple predicate where the property

  * foo.bar equals "baz" do the following:

  * <code>

  *     Predicate simple = equals("foo.bar", "baz");

  * </code>

  *

  * to create a compound predicate where the property

  * foo.bar equals "baz" and foo.id equals 1 do the following:

  * <code>

  *     Predicate compound = and(equals("foo.bar", "baz"), equals("foo.id", 1))

  * </code>

  *

  * to create a deeply nested predicate where lots of

  * properties are evaluated do the following:

  *

  * Predicate deep =

  *  and(

  *      like("display", "*Eric*"),

  *                greaterThan("birthDate", gtBirthDate),

  *                 lessThan("birthDate", ltBirthDate),

  *      or(

  *         equal("name.first", "Eric"),

  *         equal("name.last", "Westfall")))

  *

  * <p>

  *     <strong>WARNING:</strong> this class does automatic reductions

  *     such that you cannot assume the concrete {@link Predicate} type

  *     returned from this factory.

  * </p>

  *

  * @see QueryByCriteria

  */

 public final class PredicateFactory {

     private PredicateFactory() {

         throw new IllegalArgumentException("do not call");

     }

     /**

          * Creates an predicate representing equals comparison.  Defines that the property

      * represented by the given path should be equal to the specified value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>character data</li>

          *   <li>decimals</li>

          *   <li>integers</li>

          *   <li>date-time</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate equal(String propertyPath, Object value) {

                 return new EqualPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

         /**

          * Creates a predicate representing not equals comparison.  Defines that the property

      * represented by the given path should <strong>not</strong> be

          * equal to the specified value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>character data</li>

          *   <li>decimals</li>

          *   <li>integers</li>

          *   <li>date-time</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate notEqual(String propertyPath, Object value) {

                 return new NotEqualPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

     /**

          * Creates an equals ignore case predicate.  Defines that the property

      * represented by the given path should be equal to the specified value ignoring

      * the case of the value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>character data</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate equalIgnoreCase(String propertyPath, CharSequence value) {

                 return new EqualIgnoreCasePredicate(propertyPath, new CriteriaStringValue(value));

         }

         /**

          * Creates a not equals ignore case predicate.  Defines that the property

      * represented by the given path should <strong>not</strong> be

          * equal to the specified value ignoring the case of the value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>character data</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate notEqualIgnoreCase(String propertyPath, CharSequence value) {

                 return new NotEqualIgnoreCasePredicate(propertyPath, new CriteriaStringValue(value));

         }

         /**

          * Creates a like predicate.  Defines that the property

      * represented by the given path should match the specified value,

          * but supports the use of wildcards in the given value.

          *

          * <p>The supported wildcards include:

          *

          * <ul>

          *   <li><strong>?</strong> - matches on any single character</li>

          *   <li><strong>*</strong> - matches any string of any length (including zero length)</li>

          * </ul>

          *

          * <p>Because of this, the like predicate only supports character data

          * for the passed-in value.

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null

          */

         public static Predicate like(String propertyPath, CharSequence value) {

                 return new LikePredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

     /**

          * Creates a not like predicate.  Defines that the property

      * represented by the given path should <strong>not</strong> match the specified value,

          * but supports the use of wildcards in the given value.

          *

          * <p>The supported wildcards include:

          *

          * <ul>

          *   <li><strong>?</strong> - matches on any single character</li>

          *   <li><strong>*</strong> - matches any string of any length (including zero length)</li>

          * </ul>

          *

          * <p>Because of this, the like predicate only supports character data

          * for the passed-in value.

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null

          */

         public static Predicate notLike(String propertyPath, CharSequence value) {

                 return new NotLikePredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

         /**

          * Create an in predicate.  Defines that the property

      * represented by the given path should be contained within the

          * specified list of values.

          *

          * <p>Supports any of the valid types of value in the value list, with the

          * restriction that all items in the list of values must be of the same type.

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param values the values to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the values list is null, empty,

          * contains object of different types, or includes objects of an invalid type

          */

         public static <T> Predicate in(String propertyPath, T... values) {

                 return new InPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValueList(values));

         }

         /**

          * Create a not in predicate.  Defines that the property

      * represented by the given path should <strong>not</strong> be

          * contained within the specified list of values.

          *

          * <p>Supports any of the valid types of value in the value list, with the

          * restriction that all items in the list of values must be of the same type.

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param values the values to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the values list is null, empty,

          * contains object of different types, or includes objects of an invalid type

          */

         public static <T> Predicate notIn(String propertyPath, T... values) {

                 return new NotInPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValueList(values));

         }

     /**

          * Create an in ignore case predicate.  Defines that the property

      * represented by the given path should be contained within the

          * specified list of values ignoring the case of the values.

          *

          * <p>Supports any of CharSequence value in the value list, with the

          * restriction that all items in the list of values must be of the same type.

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param values the values to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the values list is null, empty,

          * contains object of different types, or includes objects of an invalid type

          */

         public static <T extends CharSequence> Predicate inIgnoreCase(String propertyPath, T... values) {

                 return new InIgnoreCasePredicate(propertyPath, CriteriaSupportUtils.createCriteriaStringValueList(values));

         }

         /**

          * Create a not in ignore case.  Defines that the property

      * represented by the given path should <strong>not</strong> be

          * contained within the specified list of values ignoring the case of the values.

          *

          * <p>Supports any CharSequence value in the value list, with the

          * restriction that all items in the list of values must be of the same type.

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param values the values to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the values list is null, empty,

          * contains object of different types, or includes objects of an invalid type

          */

         public static <T extends CharSequence> Predicate notInIgnoreCase(String propertyPath, T... values) {

                 return new NotInIgnoreCasePredicate(propertyPath, CriteriaSupportUtils.createCriteriaStringValueList(values));

         }

         /**

          * Creates a greater than predicate.  Defines that the property

      * represented by the given path should be greater than the specified value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>decimals</li>

          *   <li>integers</li>

          *   <li>date-time</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate greaterThan(String propertyPath, Object value) {

                 return new GreaterThanPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

         /**

          * Creates a greater than or equal predicate.  Defines that the

      * property represented by the given path should be greater than

          * or equal to the specified value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>decimals</li>

          *   <li>integers</li>

          *   <li>date-time</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate greaterThanOrEqual(String propertyPath, Object value) {

                 return new GreaterThanOrEqualPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

         /**

          * Creates a less than predicate.  Defines that the property

      * represented by the given path should be less than the specified value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>decimals</li>

          *   <li>integers</li>

          *   <li>date-time</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate lessThan(String propertyPath, Object value) {

                 return new LessThanPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

         /**

          * Creates a less than or equal predicate.  Defines that the

      * property represented by the given path should be less than

          * or equal to the specified value.

          *

          * <p>Supports the following types of values:

          *

          * <ul>

          *   <li>decimals</li>

          *   <li>integers</li>

          *   <li>date-time</li>

          * </ul>

          *

          * @param propertyPath the path to the property which should be evaluated

          * @param value the value to compare with the property value located at the

          * propertyPath

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          * @throws IllegalArgumentException if the value is null or of an invalid type

          */

         public static Predicate lessThanOrEqual(String propertyPath, Object value) {

                 return new LessThanOrEqualPredicate(propertyPath, CriteriaSupportUtils.determineCriteriaValue(value));

         }

         /**

          * Creates an is null predicate.  Defines that the

          * property represented by the given path should be null.

          *

          * @param propertyPath the path to the property which should be evaluated

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          */

         public static Predicate isNull(String propertyPath) {

                 return new NullPredicate(propertyPath);

         }

         /**

          * Creates an is not null predicate.  Defines that the property

      * represented by the given path should <strong>not</strong> be null.

          *

          * @param propertyPath the path to the property which should be evaluated

          *

          * @return a predicate

          *

          * @throws IllegalArgumentException if the propertyPath is null

          */

         public static Predicate isNotNull(String propertyPath) {

                 return new NotNullPredicate(propertyPath);

         }

         /**

          * Creates an and predicate that is used to "and" predicates together.

          *

          * <p>An "and" predicate will evaluate the truth value of of it's

          * internal predicates and, if all of them evaluate to true, then

          * the and predicate itself should evaluate to true.  The implementation

      * of an and predicate may short-circuit.

      *

      * <p>

      *     This factory method does automatic reductions.

      * </p>

          *

      * @param predicates to "and" together

      *

          * @return a predicate

          */

         public static Predicate and(Predicate... predicates) {

         //reduce single item compound

         if (predicates != null && predicates.length == 1 && predicates[0] != null) {

             return predicates[0];

         }

         final Set<Predicate> predicateSet = new HashSet<Predicate>();

         CollectionUtils.addAll(predicateSet, predicates);

         return new AndPredicate(predicateSet);

         }

         /**

          * Creates an  or predicate that is used to "or" predicate together.

          *

          * <p>An "or" predicate will evaluate the truth value of of it's

          * internal predicates and, if any one of them evaluate to true, then

          * the or predicate itself should evaluate to true.  If all predicates

          * contained within the "or" evaluate to false, then the or iself will

          * evaluate to false.   The implementation of an or predicate may

      * short-circuit.

          *

      * <p>

      *     This factory method does automatic reductions.

      * </p>

      * @param predicates to "or" together

      *

          * @return a predicate

          */

         public static Predicate or(Predicate... predicates) {

         //reduce single item compound

         if (predicates != null && predicates.length == 1 && predicates[0] != null) {

             return predicates[0];

         }

         final Set<Predicate> predicateSet = new HashSet<Predicate>();

         CollectionUtils.addAll(predicateSet, predicates);

                 return new OrPredicate(predicateSet);

         }

     /**

      * This method will construct a predicate based on the predicate name.

      *

      * ex: "or", Or, "OrPredicate" passing the arguments to the construction method.

      *

      * @param name the name of the predicate to create.

      * @param args the args required to construct the predicate

      * @return the Predicate

      */

     public static Predicate dynConstruct(String name, Object... args) {

         if (StringUtils.isBlank(name)) {

             throw new IllegalArgumentException("name is blank");

         }

         final String correctedName = CriteriaSupportUtils.findDynName(name);

         for (Method m : PredicateFactory.class.getMethods()) {

             //currently this class does NOT overload therefore this method doesn't have to worry about

             //overload resolution - just get the Method handle based on the passed in name

             if (m.getName().equals(correctedName)) {

                 try {

                     return (Predicate) m.invoke(null, args);

                 } catch (InvocationTargetException e) {

                     throw new DynPredicateException(e);

                 } catch (IllegalAccessException e) {

                     throw new DynPredicateException(e);

                 }

             }

         }

         throw new DynPredicateException("predicate: " + name + " doesn't exist");

     }

     //this is really a fatal error (programming error)

     //and therefore is just a private exception not really meant to be caught

     private static class DynPredicateException extends RuntimeException {

         DynPredicateException(Throwable t) {

             super(t);

         }

         DynPredicateException(String s) {

             super(s);

         }

     }

 }