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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 org.apache.openjpa.jdbc.sql.DBDictionary;
- import org.apache.openjpa.jdbc.sql.SQLBuffer;
- import org.apache.openjpa.jdbc.sql.Select;
- /**
- * Returns the number of characters in a string.
- *
- * @author Marc Prud'hommeaux
- */
- public class StringLength
- extends StringFunction {
- private Class _cast = null;
- /**
- * Constructor. Provide the string to operate on.
- */
- public StringLength(Val val) {
- super(val);
- }
- public Class getType() {
- if (_cast != null)
- return _cast;
- return int.class;
- }
- public void setImplicitType(Class type) {
- _cast = type;
- }
- public void appendTo(Select sel, ExpContext ctx, ExpState state,
- SQLBuffer buf, int index) {
- DBDictionary dict = ctx.store.getDBDictionary();
- String func = dict.stringLengthFunction;
- dict.assertSupport(func != null, "StringLengthFunction");
- func = dict.getCastFunction(getValue(), func);
- int idx = func.indexOf("{0}");
- buf.append(func.substring(0, idx));
- getValue().appendTo(sel, ctx, state, buf, index);
- buf.append(func.substring(idx + 3));
- }
- public int getId() {
- return Val.LENGTH_VAL;
- }
- }
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