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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 java.util.Collection;
import java.util.Map;
import org.apache.openjpa.jdbc.schema.Column;
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.Constant;
import org.apache.openjpa.meta.ClassMetaData;
/**
* A literal or parameter in the filter.
*
* @author Abe White
*/
abstract class Const
extends AbstractVal
implements Constant {
private static final long serialVersionUID = 1L;
private ClassMetaData _meta = null;
@Override
public ClassMetaData getMetaData() {
return _meta;
}
@Override
public void setMetaData(ClassMetaData meta) {
_meta = meta;
}
/**
* Return the SQL value of this constant.
*/
public Object getSQLValue(Select sel, ExpContext ctx, ExpState state) {
return getValue(ctx, state);
}
/**
* Return true if this constant's SQL value is equivalent to NULL.
*/
public boolean isSQLValueNull(Select sel, ExpContext ctx, ExpState state) {
Object val = getSQLValue(sel, ctx, state);
if (val == null)
return true;
if (!(val instanceof Object[]))
return false;
// all-null array is considered null
Object[] arr = (Object[]) val;
for (Object o : arr)
if (o != null)
return false;
return true;
}
/**
* Return the value of this constant. May be more robust than the
* parameters-only form.
*/
public Object getValue(ExpContext ctx, ExpState state) {
return getValue(ctx.params);
}
@Override
public ExpState initialize(Select sel, ExpContext ctx, int flags) {
return new ConstExpState();
}
/**
* Constant expression state.
*/
protected static class ConstExpState
extends ExpState {
public Column[] cols = null;
/**
* Return the column for the value at the specified index, or null.
*/
public Column getColumn(int index) {
return (cols != null && cols.length > index) ? cols[index] : null;
}
}
@Override
public void calculateValue(Select sel, ExpContext ctx, ExpState state,
Val other, ExpState otherState) {
if (other instanceof PCPath)
((ConstExpState) state).cols = ((PCPath) other).
getColumns(otherState);
}
@Override
public void select(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
sel.select(newSQLBuffer(sel, ctx, state), this);
}
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 void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
}
@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());
}
@Override
public Object load(ExpContext ctx, ExpState state, Result res)
throws SQLException {
return getValue(ctx, state);
}
@Override
public int length(Select sel, ExpContext ctx, ExpState state) {
return 1;
}
@Override
public void appendIsEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
Object obj = getValue(ctx, state);
if (obj instanceof Collection && ((Collection) obj).isEmpty())
sql.append(TRUE);
else if (obj instanceof Map && ((Map) obj).isEmpty())
sql.append(TRUE);
else
sql.append(FALSE);
}
@Override
public void appendIsNotEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql){
Object obj = getValue(ctx, state);
if (obj instanceof Collection && ((Collection) obj).isEmpty())
sql.append(FALSE);
else if (obj instanceof Map && ((Map) obj).isEmpty())
sql.append(FALSE);
else
sql.append(TRUE);
}
@Override
public void appendSize(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
Object obj = getValue(ctx, state);
if (obj instanceof Collection)
sql.appendValue(((Collection) obj).size());
else if (obj instanceof Map)
sql.appendValue(((Map) obj).size());
else
sql.append("1");
}
@Override
public void appendIsNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
if (isSQLValueNull(sel, ctx, state))
sql.append(TRUE);
else
sql.append(FALSE);
}
@Override
public void appendIsNotNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
if (!isSQLValueNull(sel, ctx, state))
sql.append(TRUE);
else
sql.append(FALSE);
}
}
