onl.area51.httpd.util.PathEntity.java Source code

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Here is the source code for onl.area51.httpd.util.PathEntity.java

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/*
 * Copyright 2016 peter.
 *
 * 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 onl.area51.httpd.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import onl.area51.httpd.action.Request;
import org.apache.http.HttpEntity;
import org.apache.http.entity.AbstractHttpEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.util.Args;

/**
 * A java nio2 equivalent to {@link org.apache.http.entity.FileEntity}
 *
 * @author peter
 */
public class PathEntity extends AbstractHttpEntity implements Cloneable {

    protected final Path file;

    public static HttpEntity create(String n, Request r) {
        return new PathEntity(r.getAttribute(n));
    }

    public static HttpEntity createSizeOnly(String n, Request r) {
        return new PathEntity.SizeOnly(r.getAttribute(n));
    }

    @SuppressWarnings("OverridableMethodCallInConstructor")
    public PathEntity(final Path file, final ContentType contentType) {
        super();
        this.file = Args.notNull(file, "Path");
        if (contentType != null) {
            setContentType(contentType.toString());
        }
    }

    public PathEntity(final Path file) {
        this(file, ContentTypeResolver.resolve(file));
    }

    @Override
    public boolean isRepeatable() {
        return true;
    }

    @Override
    public long getContentLength() {
        try {
            return Files.size(file);
        } catch (IOException ex) {
            throw new UncheckedIOException(ex);
        }
    }

    @Override
    public InputStream getContent() throws IOException {
        return Files.newInputStream(file, StandardOpenOption.READ);
    }

    @Override
    public void writeTo(final OutputStream outstream) throws IOException {
        Files.copy(file, outstream);
    }

    /**
     * Tells that this entity is not streaming.
     *
     * @return {@code false}
     */
    @Override
    public boolean isStreaming() {
        return false;
    }

    @Override
    public Object clone() throws CloneNotSupportedException {
        // Path instance is considered immutable
        // No need to make a copy of it
        return super.clone();
    }

    public static class SizeOnly extends PathEntity {

        public SizeOnly(final Path file, final ContentType contentType) {
            super(file, contentType);
        }

        public SizeOnly(final Path file) {
            super(file);
        }

        @Override
        public InputStream getContent() throws IOException {
            return new InputStream() {
                @Override
                public int read() throws IOException {
                    return -1;
                }
            };
        }

        @Override
        public void writeTo(OutputStream outstream) throws IOException {
        }

    }
}