org.apache.openjpa.kernel.exps.Concat Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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*/
package org.apache.openjpa.kernel.exps;
import org.apache.openjpa.kernel.StoreContext;
/**
* Concatenate two strings together.
*
* @author Marc Prud'hommeaux
*/
class Concat
extends Val {
private final Val _val;
private final Val _args;
/**
* Constructor. Provide target string and the arguments to the
* indexOf method.
*/
public Concat(Val val, Val args) {
_val = val;
_args = args;
}
public Class getType() {
return String.class;
}
public void setImplicitType(Class type) {
}
protected Object eval(Object candidate, Object orig,
StoreContext ctx, Object[] params) {
Object str = _val.eval(candidate, orig, ctx, params);
StringBuilder cat = new StringBuilder(str.toString());
Object arg = _args.eval(candidate, orig, ctx, params);
if (arg instanceof Object[]) {
for (int i = 0; i < ((Object[]) arg).length; i++)
cat.append((((Object[]) arg)[i]).toString());
} else
cat.append(arg.toString());
return cat.toString();
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_val.acceptVisit(visitor);
_args.acceptVisit(visitor);
visitor.exit(this);
}
}