de.cosmocode.palava.mail.attachments.LocalFileAttachment.java Source code

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Here is the source code for de.cosmocode.palava.mail.attachments.LocalFileAttachment.java

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/**
 * Copyright 2010 CosmoCode GmbH
 *
 * 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.cosmocode.palava.mail.attachments;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;

import com.google.common.base.Preconditions;
import com.google.common.io.Files;
import com.google.common.io.InputSupplier;

/**
 * {@link File} based {@link MailAttachmentSource} implementation.
 * 
 * @author Tobias Sarnowski
 * @author Willi Schoenborn
 */
public class LocalFileAttachment implements MailAttachmentSource {

    @Override
    public MailAttachment generate(final String name, Map<String, String> configuration) {
        final String fileName = configuration.get("file");
        Preconditions.checkNotNull(fileName, "'file' not configured for attachment");

        final File file = new File(fileName);
        final InputSupplier<FileInputStream> supplier = Files.newInputStreamSupplier(file);

        return new MailAttachment() {

            @Override
            public String getName() {
                return name;
            }

            @Override
            public InputStream getContent() {
                try {
                    return supplier.getInput();
                } catch (IOException e) {
                    throw new IllegalStateException(e);
                }
            }

            @Override
            public String toString() {
                return "LocalFileAttachment [" + name + "]";
            }

        };
    }

}