01: /**
02: * Copyright 2006 Webmedia Group Ltd.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: **/package org.araneaframework.backend.list.helper.naming;
16:
17: import org.araneaframework.backend.list.memorybased.Variable;
18: import org.araneaframework.backend.list.memorybased.expression.VariableResolver;
19: import org.araneaframework.core.Assert;
20:
21: /**
22: * VariableResolver that converts a variable (using its name) into column alias.
23: * <p>
24: * Column aliases should be used in <code>WHERE</code> and <code>ORDER BY </code> clauses.
25: *
26: * @see ColumnNameVariableResolver
27: *
28: * @author Rein Raudjärv
29: *
30: * @since 1.1
31: */
32: public class ColumnAliasVariableResolver implements VariableResolver {
33:
34: private static final long serialVersionUID = 1L;
35:
36: private final NamingStrategy namingStrategy;
37:
38: public ColumnAliasVariableResolver(NamingStrategy namingStrategy) {
39: Assert.notNullParam(namingStrategy, "namingStrategy");
40: this .namingStrategy = namingStrategy;
41: }
42:
43: public Object resolve(Variable variable) {
44: return namingStrategy.fieldToColumnAlias(variable.getName());
45: }
46:
47: }
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