de.jcup.egradle.template.TemplateFileNameTransformer.java Source code

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Here is the source code for de.jcup.egradle.template.TemplateFileNameTransformer.java

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/*
 * Copyright 2016 Albert Tregnaghi
 *
 * 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 de.jcup.egradle.template;

import java.util.Properties;

import org.apache.commons.lang3.StringUtils;

import de.jcup.egradle.core.util.Transformer;

class TemplateFileNameTransformer implements Transformer<String> {
    private Properties properties;

    public TemplateFileNameTransformer(Properties properties) {
        if (properties == null) {
            throw new IllegalArgumentException("'properties' may not be null");
        }
        this.properties = properties;
    }

    @Override
    public String transform(String source) {
        if (source == null) {
            return null;
        }
        if (source.startsWith("_")) {
            source = StringUtils.substringAfterLast(source, "_");
        }
        if (source.startsWith("$")) {
            String key = StringUtils.substringAfterLast(source, "$");

            String found = properties.getProperty(key);

            if (StringUtils.isNotBlank(found)) {
                return found;
            }
        }
        return source;
    }

}