org.iglootools.hchelpers.core.mime.InputSupplierSourceBody.java Source code

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Here is the source code for org.iglootools.hchelpers.core.mime.InputSupplierSourceBody.java

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/**
 * Copyright 2011 Sami Dalouche
 *
 * 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.iglootools.hchelpers.core.mime;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.http.entity.mime.MIME;
import org.apache.http.entity.mime.content.AbstractContentBody;

import com.google.common.base.Preconditions;
import com.google.common.io.ByteStreams;
import com.google.common.io.Closeables;
import com.google.common.io.InputSupplier;

/**
 * A repeatable Source Body that fetches its data from an {@link InputSupplier}
 * 
 * @author Sami Dalouche (sami.dalouche@gmail.com)
 *
 */
public final class InputSupplierSourceBody extends AbstractContentBody {
    private final InputSupplier<InputStream> inputSupplier;
    private final String filename;

    public InputSupplierSourceBody(final InputSupplier<InputStream> inputSupplier, final String mimeType,
            final String filename) {
        super(mimeType);
        Preconditions.checkArgument(inputSupplier != null, "InputSupplier may not be null");

        this.inputSupplier = inputSupplier;
        this.filename = filename;
    }

    public InputSupplierSourceBody(final InputSupplier<InputStream> inputSupplier, final String filename) {
        this(inputSupplier, "application/octet-stream", filename);
    }

    public InputStream getInputStream() throws IOException {
        return this.inputSupplier.getInput();
    }

    public void writeTo(final OutputStream out) throws IOException {
        if (out == null) {
            throw new IllegalArgumentException("Output stream may not be null");
        }
        InputStream in = null;
        try {
            in = this.inputSupplier.getInput();
            ByteStreams.copy(in, out);
            out.flush();
        } finally {
            Closeables.closeQuietly(in);
        }
    }

    public String getTransferEncoding() {
        return MIME.ENC_BINARY;
    }

    public String getCharset() {
        return null;
    }

    public long getContentLength() {
        return -1;
    }

    public String getFilename() {
        return this.filename;
    }
}