org.apache.mahout.classifier.sgd.bankmarketing.TelephoneCallParser.java Source code

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Here is the source code for org.apache.mahout.classifier.sgd.bankmarketing.TelephoneCallParser.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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
 *
 * 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.apache.mahout.classifier.sgd.bankmarketing;

import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;
import com.google.common.collect.AbstractIterator;
import com.google.common.io.Resources;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Iterator;

/** Parses semi-colon separated data as TelephoneCalls  */
public class TelephoneCallParser implements Iterable<TelephoneCall> {

    private final Splitter onSemi = Splitter.on(";").trimResults(CharMatcher.anyOf("\" ;"));
    private String resourceName;

    public TelephoneCallParser(String resourceName) throws IOException {
        this.resourceName = resourceName;
    }

    @Override
    public Iterator<TelephoneCall> iterator() {
        try {
            return new AbstractIterator<TelephoneCall>() {
                BufferedReader input = new BufferedReader(
                        new InputStreamReader(Resources.getResource(resourceName).openStream()));
                Iterable<String> fieldNames = onSemi.split(input.readLine());

                @Override
                protected TelephoneCall computeNext() {
                    try {
                        String line = input.readLine();
                        if (line == null) {
                            return endOfData();
                        }

                        return new TelephoneCall(fieldNames, onSemi.split(line));
                    } catch (IOException e) {
                        throw new RuntimeException("Error reading data", e);
                    }
                }
            };
        } catch (IOException e) {
            throw new RuntimeException("Error reading data", e);
        }
    }
}