SpringResourceValueConverter.java

/*
 * Copyright 2008 the original author or authors.
 *
 * 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 org.constretto.spring.internal.converter;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import org.constretto.ValueConverter;
import org.constretto.exception.ConstrettoConversionException;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

/**
 * @author <a href="mailto:kaare.nilsen@gmail.com">Kaare Nilsen</a>
 */
public class SpringResourceValueConverter implements ValueConverter<Resource> {
    private final Type listType = new TypeToken<List<String>>() {}.getType();
    private final Gson gson = new Gson();

    public Resource fromString(String value) throws ConstrettoConversionException {
        return new DefaultResourceLoader(this.getClass().getClassLoader()).getResource(value);
    }

    public List<Resource> fromStrings(String value) throws ConstrettoConversionException {
        List<Resource> resources = new ArrayList<Resource>();
        List<String> strings = gson.fromJson(value,listType);
        for (String string : strings) {
            resources.add(fromString(string));
        }
        return resources;
    }
}