com.marklogic.mapreduce.ForestDocument.java Source code

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Here is the source code for com.marklogic.mapreduce.ForestDocument.java

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/*
 * Copyright 2003-2016 MarkLogic Corporation
 *
 * 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 com.marklogic.mapreduce;

import java.io.ByteArrayInputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InputStream;

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.io.WritableUtils;

import com.marklogic.tree.ExpandedTree;
import com.marklogic.tree.NodeKind;

/**
 * A {@link MarkLogicDocument} retrieved from a MarkLogic forest through 
 * Direct Access.
 * 
 * @see ForestInputFormat
 * @author jchen
 */
public abstract class ForestDocument implements MarkLogicDocument {
    public static final Log LOG = LogFactory.getLog(ForestDocument.class);

    private long fragmentOrdinal;
    private String[] collections;

    public static ForestDocument createDocument(Configuration conf, Path forestDir, ExpandedTree tree, String uri) {
        byte rootNodeKind = tree.rootNodeKind();
        ForestDocument doc = null;
        switch (rootNodeKind) {
        case NodeKind.BINARY:
            if (tree.binaryData == null) {
                doc = new LargeBinaryDocument(conf, forestDir, tree);
            } else {
                doc = new RegularBinaryDocument(tree);
            }
            break;
        case NodeKind.ELEM:
        case NodeKind.TEXT:
        case NodeKind.PI:
        case NodeKind.COMMENT:
            doc = new DOMDocument(tree);
            break;
        case NodeKind.ARRAY:
        case NodeKind.OBJECT:
        case NodeKind.NULL:
        case NodeKind.BOOLEAN:
        case NodeKind.NUMBER:
            if (LOG.isDebugEnabled()) {
                LOG.debug("Creating JSONDocument " + rootNodeKind + " (" + uri + ")");
            }
            doc = new JSONDocument(tree);
            break;
        default:
            return null;
        }
        doc.setFragmentOrdinal(tree.getFragmentOrdinal());
        doc.setCollections(tree.getCollections());
        return doc;
    }

    public long getFragmentOrdinal() {
        return fragmentOrdinal;
    }

    private void setFragmentOrdinal(long fragOrdinal) {
        fragmentOrdinal = fragOrdinal;
    }

    public String[] getCollections() {
        return collections;
    }

    private void setCollections(String[] cols) {
        collections = cols;
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        fragmentOrdinal = in.readLong();
        collections = WritableUtils.readStringArray(in);
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeLong(fragmentOrdinal);
        WritableUtils.writeStringArray(out, collections);
    }

    @Override
    public InputStream getContentAsByteStream() {
        return new ByteArrayInputStream(getContentAsByteArray());
    }

    @Override
    public long getContentSize() {
        byte[] buf = getContentAsByteArray();
        return buf.length;
    }

    @Override
    public boolean isStreamable() {
        return false;
    }
}