| /* |
| * 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.persistence.query; |
| |
| /** |
| * Denotes TRIM(e1,x) Expression. |
| * |
| * @author Pinaki Poddar |
| * |
| */ |
| public class TrimExpression extends UnaryOperatorExpression { |
| private final Expression _trimChar; |
| private final TrimSpec _trimSpec; |
| private static final String DEFAULT_TRIM_CHAR = "' '"; |
| private static final String DEFAULT_TRIM_SPEC = EMPTY; |
| |
| public TrimExpression(Expression op, char ch, TrimSpec spec) { |
| super(op, UnaryFunctionalOperator.TRIM); |
| _trimChar = new ConstantExpression(ch); |
| _trimSpec = spec; |
| } |
| |
| public TrimExpression(Expression op, Expression ch, TrimSpec spec) { |
| super(op, UnaryFunctionalOperator.TRIM); |
| _trimChar = ch; |
| _trimSpec = spec; |
| } |
| |
| public String asExpression(AliasContext ctx) { |
| String trimChar = _trimChar == null ? DEFAULT_TRIM_CHAR |
| : ((Visitable)_trimChar).asExpression(ctx); |
| String trimSpec = _trimSpec == null ? DEFAULT_TRIM_SPEC : |
| _trimSpec.toString(); |
| return _op.toString() |
| + OPEN_BRACE |
| + trimSpec |
| + SPACE |
| + trimChar |
| + " FROM " |
| + ((Visitable)_e).asExpression(ctx) |
| + CLOSE_BRACE; |
| } |
| |
| } |