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/*
* Copyright 2007-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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 com.amazon.carbonado.repo.jdbc;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.filter.FilterValues;
import com.amazon.carbonado.filter.PropertyFilter;
/**
*
*
* @author Brian S O'Neill
*/
class NullablePropertyStatement<S extends Storable> extends SQLStatement<S> {
private final PropertyFilter<S> mFilter;
private final boolean mIsNullOp;
NullablePropertyStatement(PropertyFilter<S> filter, boolean isNullOp) {
mFilter = filter;
mIsNullOp = isNullOp;
}
@Override
public int maxLength() {
return mIsNullOp ? 8 : 12; // for " IS NULL" or " IS NOT NULL"
}
@Override
public void appendTo(StringBuilder b, FilterValues<S> filterValues) {
if (filterValues != null
&& filterValues.getValue(mFilter) == null
&& filterValues.isAssigned(mFilter))
{
if (mIsNullOp) {
b.append(" IS NULL");
} else {
b.append(" IS NOT NULL");
}
} else {
if (mIsNullOp) {
b.append("=?");
} else {
b.append("<>?");
}
}
}
}
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