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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.meta.JavaSQLTypes;
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.Filters;
import org.apache.openjpa.kernel.exps.ExpressionVisitor;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.meta.JavaTypes;
/**
* Value produced by a unary operation on a value.
*
* @author Abe White
*/
abstract class UnaryOp
extends AbstractVal {
private static final long serialVersionUID = 1L;
private final Val _val;
private ClassMetaData _meta = null;
private Class _cast = null;
private boolean _noParen = false;
/**
* Constructor. Provide the value to operate on.
*/
public UnaryOp(Val val) {
_val = val;
}
public UnaryOp(Val val, boolean noParen) {
_val = val;
_noParen = noParen;
}
public Val getValue() {
return _val;
}
@Override
public ClassMetaData getMetaData() {
return _meta;
}
@Override
public void setMetaData(ClassMetaData meta) {
_meta = meta;
}
@Override
public Class getType() {
if (_cast != null)
return _cast;
return getType(_val.getType());
}
@Override
public void setImplicitType(Class type) {
_cast = type;
}
public boolean getNoParen() {
return _noParen;
}
@Override
public ExpState initialize(Select sel, ExpContext ctx, int flags) {
return initializeValue(sel, ctx, flags);
}
protected ExpState initializeValue(Select sel, ExpContext ctx, int flags) {
return _val.initialize(sel, ctx, flags);
}
@Override
public void select(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
sel.select(newSQLBuffer(sel, ctx, state), this);
if (isAggregate())
sel.setAggregate(true);
}
@Override
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
_val.selectColumns(sel, ctx, state, true);
}
@Override
public void groupBy(Select sel, ExpContext ctx, ExpState state) {
sel.groupBy(newSQLBuffer(sel, ctx, state));
}
@Override
public void orderBy(Select sel, ExpContext ctx, ExpState state,
boolean asc) {
sel.orderBy(newSQLBuffer(sel, ctx, state), asc, false, getSelectAs());
}
private SQLBuffer newSQLBuffer(Select sel, ExpContext ctx, ExpState state) {
calculateValue(sel, ctx, state, null, null);
SQLBuffer buf = new SQLBuffer(ctx.store.getDBDictionary());
appendTo(sel, ctx, state, buf, 0);
return buf;
}
@Override
public Object load(ExpContext ctx, ExpState state, Result res)
throws SQLException {
Class type = getType();
int typeCode = type != null ? JavaTypes.getTypeCode(type) : JavaSQLTypes.JDBC_DEFAULT;
if (typeCode == JavaTypes.DATE) {
// further clarify which date exactly
typeCode = JavaSQLTypes.getDateTypeCode(type);
}
Object value = res.getObject(this, typeCode, null);
if (value == null) {
if (nullableValue(ctx, state)) { // OPENJPA-1794
return null;
}
else if (type.isPrimitive() || Number.class.isAssignableFrom(type)) {
value = Filters.getDefaultForNull(Filters.wrap(type));
}
}
return Filters.convert(value, type);
}
@Override
public void calculateValue(Select sel, ExpContext ctx, ExpState state,
Val other, ExpState otherState) {
_val.calculateValue(sel, ctx, state, null, null);
}
@Override
public int length(Select sel, ExpContext ctx, ExpState state) {
return 1;
}
@Override
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql, int index) {
sql.append(getOperator());
sql.append(_noParen ? " " : "(");
_val.appendTo(sel, ctx, state, sql, 0);
// OPENJPA-2149: If _val (Val) is an 'Arg', we need to get the Val[]
// from it, and the single element it contains because the
// 'addCastForParam' method gets the 'type' from the Val it receives.
// In the case where _val is an Arg, when addCastForParam gets the
// type, it will be getting the type of the Val (an Object) rather
// the type of the Arg.
sql.addCastForParam(getOperator(),
(_val instanceof Args) ? (((Args) _val).getVals())[0]
: _val);
if (!_noParen)
sql.append(")");
}
/**
* Return the type of this value based on the argument type. Returns
* the argument type by default.
*/
protected Class getType(Class c) {
return c;
}
/**
* Return the name of this operator.
*/
protected abstract String getOperator();
@Override
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_val.acceptVisit(visitor);
visitor.exit(this);
}
// OPENJPA-1794
protected boolean nullableValue(ExpContext ctx, ExpState state) {
return false;
}
}
