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/* 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.flowable.engine.impl.util.io;

import java.io.BufferedInputStream;
import java.io.InputStream;

import org.flowable.common.engine.api.FlowableIllegalArgumentException;
import org.flowable.common.engine.impl.util.ReflectUtil;
import org.flowable.common.engine.impl.util.io.StreamSource;

/**
 * @author Tom Baeyens
 * @author Joram Barrez
 */
public class ResourceStreamSource implements StreamSource {

    String resource;
    ClassLoader classLoader;

    public ResourceStreamSource(String resource) {
        this.resource = resource;
    }

    public ResourceStreamSource(String resource, ClassLoader classLoader) {
        this.resource = resource;
        this.classLoader = classLoader;
    }

    @Override
    public InputStream getInputStream() {
        InputStream inputStream = null;
        if (classLoader == null) {
            inputStream = ReflectUtil.getResourceAsStream(resource);
        } else {
            inputStream = classLoader.getResourceAsStream(resource);
        }
        if (inputStream == null) {
            throw new FlowableIllegalArgumentException("resource '" + resource + "' doesn't exist");
        }
        return new BufferedInputStream(inputStream);
    }

    @Override
    public String toString() {
        return "Resource[" + resource + "]";
    }
}