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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.jdbc.kernel.exps;
import java.sql.SQLException;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.exps.Value;
/**
* A Value represents any non-operator in a query filter, including
* constants, variables, and object fields.
*
* @author Abe White
*/
public interface Val
extends Value {
/**
* Initialization flag indicating that this value will be compared to null.
*/
int NULL_CMP = 2 << 0;
/**
* Initialization flag indicating to join into any relation path.
*/
int JOIN_REL = 2 << 1;
/**
* Initialization flag indicating to force an outer join into any relation
* path.
*/
int FORCE_OUTER = 2 << 2;
/**
* Initialization flag indicating to this value is for compare/equal
* path.
*/
int CMP_EQUAL = 2 << 3;
int VAL = 0;
int MATH_VAL = 1;
int CONCAT_VAL = 2;
int SUBSTRING_VAL = 3;
int UPPER_VAL = 4;
int LOWER_VAL = 5;
int TRIM_VAL = 6;
int LENGTH_VAL = 7;
int LOCATE_VAL = 8;
int ARGS_VAL = 9;
int INDEXOF_VAL = 10;
int ABS_VAL = 11;
int SQRT_VAL = 12;
int SIMPLECASE_VAL = 13;
int GENERALCASE_VAL = 14;
int WHENCONDITION_VAL = 15;
int WHENSCALAR_VAL = 16;
int COALESCE_VAL = 17;
int NULLIF_VAL = 18;
/**
* Initialize the value. This method should recursively initialize any
* sub-values.
*/
ExpState initialize(Select sel, ExpContext ctx, int flags);
/**
* Return the datastore value of the given object in the context of this
* value.
*/
Object toDataStoreValue(Select sel, ExpContext ctx, ExpState state,
Object val);
/**
* Select the data for this value.
*/
void select(Select sel, ExpContext ctx, ExpState state, boolean pks);
/**
* Select just the columns for this value.
*/
void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks);
/**
* Group by this value.
*/
void groupBy(Select sel, ExpContext ctx, ExpState state);
/**
* Order by this value.
*/
void orderBy(Select sel, ExpContext ctx, ExpState state,
boolean asc);
/**
* Load the data for this value.
*/
Object load(ExpContext ctx, ExpState state, Result res)
throws SQLException;
/**
* Calculate and cache the SQL for this value. This method is called
* before length or any append methods.
*
* @param other the value being compared to, or null if not a comparison
*/
void calculateValue(Select sel, ExpContext ctx, ExpState state,
Val other, ExpState otherState);
/**
* Return the number of SQL elements in this value.
*/
int length(Select sel, ExpContext ctx, ExpState state);
/**
* Append the indexth SQL element to the given buffer.
*/
void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql,
int index);
/**
* Append the SQL testing whether this value is empty to the given buffer.
*/
void appendIsEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql);
/**
* Append the SQL testing whether this value is not empty to
* the given buffer.
*/
void appendIsNotEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql);
/**
* Append the SQL checking the index of this value.
*/
void appendIndex(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql);
/**
* Append the SQL checking the type of this value.
*/
void appendType(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql);
/**
* Append the SQL checking the size of this value.
*/
void appendSize(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql);
/**
* Append the SQL testing whether this value is null to the given buffer.
*/
void appendIsNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql);
/**
* Append the SQL testing whether this value is not null to the given
* buffer.
*/
void appendIsNotNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql);
int getId();
@Override Value getSelectAs();
}
