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/**
 * Copyright (c) 2012-2016, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.tinygroup.menucommand.function;

import org.tinygroup.template.Template;
import org.tinygroup.template.TemplateContext;
import org.tinygroup.template.TemplateException;
import org.tinygroup.template.function.AbstractTemplateFunction;

/**
 * 支持字符串的填充到指定长度
 *
 * @author yancheng11334
 */
public class FillTemplateFunction extends AbstractTemplateFunction {

    public FillTemplateFunction() {
        super("fill");
    }

    public String getBindingTypes() {
        return "java.lang.String";
    }

    public Object execute(Template template, TemplateContext context,
                          Object... parameters) throws TemplateException {
        String value = (String) parameters[0];
        Integer length = (Integer) parameters[1];
        String tag = " ";

        //长度超过指定长度
        if (value.length() >= length) {
            return value;
        }

        //填充逻辑
        int n = length - value.length();
        for (int i = 0; i < n; i++) {
            value = value + tag;
        }
        return value;
    }

}