org.apache.openjpa.kernel.exps.Trim Maven / Gradle / Ivy
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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.kernel.exps;
import org.apache.openjpa.kernel.StoreContext;
/**
* Trims leading, trailing, or both charactes from a String.
*
* @author Marc Prud'hommeaux
*/
class Trim
extends Val {
private final Val _val;
private final Val _trimChar;
private final Boolean _where;
/**
* Constructor. Provide value to upper-case.
*/
public Trim(Val val, Val trimChar, Boolean where) {
_val = val;
_trimChar = trimChar;
_where = where;
}
public Class getType() {
return String.class;
}
public void setImplicitType(Class type) {
}
protected Object eval(Object candidate, Object orig,
StoreContext ctx, Object[] params) {
Object eval = _val.eval(candidate, orig, ctx, params);
if (eval == null)
return null;
String toTrim = _trimChar.eval(candidate, orig, ctx, params).
toString();
String str = eval.toString();
// null indicates both, TRUE indicates leading
if (_where == null || Boolean.TRUE.equals(_where)) {
while (str.startsWith(toTrim))
str = str.substring(toTrim.length());
}
// null indicates both, FALSE indicates trailing
if (_where == null || Boolean.FALSE.equals(_where)) {
while (str.endsWith(toTrim))
str = str.substring(0, str.length() - toTrim.length());
}
return str;
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_val.acceptVisit(visitor);
_trimChar.acceptVisit(visitor);
visitor.exit(this);
}
}