com.cloudera.crunch.io.impl.FileSourceImpl.java Source code

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Here is the source code for com.cloudera.crunch.io.impl.FileSourceImpl.java

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/**
 * Copyright (c) 2012, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. licenses this file to you 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
 *
 * This software 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 com.cloudera.crunch.io.impl;

import java.io.IOException;

import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;

import com.cloudera.crunch.Source;
import com.cloudera.crunch.impl.mr.run.CrunchInputs;
import com.cloudera.crunch.io.SourceTargetHelper;
import com.cloudera.crunch.type.PType;

public abstract class FileSourceImpl<T> implements Source<T> {

    private static final Log LOG = LogFactory.getLog(FileSourceImpl.class);

    protected final Path path;
    protected final PType<T> ptype;
    protected final Class<? extends FileInputFormat> inputFormatClass;

    public FileSourceImpl(Path path, PType<T> ptype, Class<? extends FileInputFormat> inputFormatClass) {
        this.path = path;
        this.ptype = ptype;
        this.inputFormatClass = inputFormatClass;
    }

    @Override
    public PType<T> getType() {
        return ptype;
    }

    @Override
    public void configureSource(Job job, int inputId) throws IOException {
        if (inputId == -1) {
            FileInputFormat.addInputPath(job, path);
            job.setInputFormatClass(inputFormatClass);
        } else {
            CrunchInputs.addInputPath(job, path, inputFormatClass, inputId);
        }
    }

    @Override
    public long getSize(Configuration configuration) {
        try {
            return SourceTargetHelper.getPathSize(configuration, path);
        } catch (IOException e) {
            LOG.warn(String.format("Exception thrown looking up size of: %s", path), e);
        }
        return 1L;
    }

    @Override
    public boolean equals(Object other) {
        if (other == null || !getClass().equals(other.getClass())) {
            return false;
        }
        FileSourceImpl o = (FileSourceImpl) other;
        return ptype.equals(o.ptype) && path.equals(o.path) && inputFormatClass.equals(o.inputFormatClass);
    }

    @Override
    public int hashCode() {
        return new HashCodeBuilder().append(ptype).append(path).append(inputFormatClass).toHashCode();
    }

    @Override
    public String toString() {
        return new StringBuilder().append(inputFormatClass.getSimpleName()).append("(").append(path).append(")")
                .toString();
    }
}