_DelayedJoinWithComma.java

/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * Licensed 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 freemarker.core;

/** Don't use this; used internally by FreeMarker, might changes without notice. */
public class _DelayedJoinWithComma extends _DelayedConversionToString {

    public _DelayedJoinWithComma(String[] items) {
        super(items);
    }

    @Override
    protected String doConversion(Object obj) {
        String[] items = (String[]) obj;
        
        int totalLength = 0;
        for (int i = 0; i < items.length; i++) {
            if (i != 0) totalLength += 2;
            totalLength += items[i].length();
        }
        
        StringBuilder sb = new StringBuilder(totalLength);
        for (int i = 0; i < items.length; i++) {
            if (i != 0) sb.append(", ");
            sb.append(items[i]);
        }
        
        return sb.toString();
    }

}