com.cloudera.crunch.impl.mr.plan.DoNode.java Source code

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Here is the source code for com.cloudera.crunch.impl.mr.plan.DoNode.java

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/**
 * Copyright (c) 2011, 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.impl.mr.plan;

import java.util.List;

import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.hadoop.conf.Configuration;

import com.cloudera.crunch.DoFn;
import com.cloudera.crunch.Source;
import com.cloudera.crunch.impl.mr.run.NodeContext;
import com.cloudera.crunch.impl.mr.run.RTNode;
import com.cloudera.crunch.type.Converter;
import com.cloudera.crunch.type.DataBridge;
import com.cloudera.crunch.type.PGroupedTableType;
import com.cloudera.crunch.type.PType;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;

public class DoNode {

    private static final List<DoNode> NO_CHILDREN = ImmutableList.of();

    private final DoFn fn;
    private final String name;
    private final PType ptype;
    private final List<DoNode> children;
    private final Converter outputConverter;
    private final Source source;
    private String outputName;

    private DoNode(DoFn fn, String name, PType ptype, List<DoNode> children, Converter outputConverter,
            Source source) {
        this.fn = fn;
        this.name = name;
        this.ptype = ptype;
        this.children = children;
        this.outputConverter = outputConverter;
        this.source = source;
    }

    private static List<DoNode> allowsChildren() {
        return Lists.newArrayList();
    }

    public static <K, V> DoNode createGroupingNode(String name, PGroupedTableType<K, V> ptype) {
        DoFn fn = ptype.getOutputMapFn();
        return new DoNode(fn, name, ptype, NO_CHILDREN, ptype.getGroupingConverter(), null);
    }

    public static <S> DoNode createOutputNode(String name, PType<S> ptype) {
        Converter outputConverter = ptype.getConverter();
        DoFn fn = ptype.getOutputMapFn();
        return new DoNode(fn, name, ptype, NO_CHILDREN, outputConverter, null);
    }

    public static DoNode createFnNode(String name, DoFn<?, ?> function, PType<?> ptype) {
        return new DoNode(function, name, ptype, allowsChildren(), null, null);
    }

    public static <S> DoNode createInputNode(Source<S> source) {
        PType ptype = source.getType();
        DoFn fn = ptype.getInputMapFn();
        return new DoNode(fn, source.toString(), ptype, allowsChildren(), null, source);
    }

    public boolean isInputNode() {
        return source != null;
    }

    public boolean isOutputNode() {
        return outputConverter != null;
    }

    public String getName() {
        return name;
    }

    public List<DoNode> getChildren() {
        return children;
    }

    public Source getSource() {
        return source;
    }

    public PType getPType() {
        return ptype;
    }

    public DoNode addChild(DoNode node) {
        if (!children.contains(node)) {
            this.children.add(node);
        }
        return this;
    }

    public void setOutputName(String outputName) {
        if (outputConverter == null) {
            throw new IllegalStateException("Cannot set output name w/o output converter: " + outputName);
        }
        this.outputName = outputName;
    }

    public RTNode toRTNode(boolean inputNode, Configuration conf, NodeContext nodeContext) {
        List<RTNode> childRTNodes = Lists.newArrayList();
        fn.configure(conf);
        for (DoNode child : children) {
            childRTNodes.add(child.toRTNode(false, conf, nodeContext));
        }

        Converter inputConverter = null;
        if (inputNode) {
            if (nodeContext == NodeContext.MAP) {
                inputConverter = ptype.getConverter();
            } else {
                inputConverter = ((PGroupedTableType) ptype).getGroupingConverter();
            }
        }
        return new RTNode(fn, name, childRTNodes, inputConverter, outputConverter, outputName);
    }

    @Override
    public boolean equals(Object other) {
        if (other == null || !(other instanceof DoNode)) {
            return false;
        }
        if (this == other) {
            return true;
        }
        DoNode o = (DoNode) other;
        return (name.equals(o.name) && fn.equals(o.fn) && source == o.source
                && outputConverter == o.outputConverter);
    }

    @Override
    public int hashCode() {
        HashCodeBuilder hcb = new HashCodeBuilder();
        return hcb.append(name).append(fn).append(source).append(outputConverter).toHashCode();
    }
}