org.briljantframework.data.reader.StringDataEntry.java Source code

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Here is the source code for org.briljantframework.data.reader.StringDataEntry.java

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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Isak Karlsson
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.briljantframework.data.reader;

import org.apache.commons.lang3.math.NumberUtils;
import org.briljantframework.data.Is;
import org.briljantframework.data.Na;
import org.briljantframework.data.resolver.Resolve;

/**
 * Converts a string array to a data entry.
 * 
 * @author Isak Karlsson
 */
public final class StringDataEntry implements DataEntry {

    public static final String MISSING_VALUE = "?";
    private final String[] values;
    private final String missingValue;
    private int current = 0;

    public StringDataEntry(String... values) {
        this(values, MISSING_VALUE);
    }

    public StringDataEntry(String[] values, String missingValue) {
        this.values = values;
        this.missingValue = missingValue;
    }

    @Override
    public <T> T next(Class<T> cls) {
        String value = nextString();
        if (Is.NA(value)) {
            return Na.of(cls);
        }
        return Resolve.to(cls, value);
    }

    @Override
    public String nextString() {
        String value = values[current++];
        if (value == null) {
            return null;
        } else {
            value = value.trim();
            return value.equals(missingValue) ? null : value;
        }
    }

    @Override
    public int nextInt() {
        String repr = nextString();
        if (repr == null || !NumberUtils.isNumber(repr)) {
            return Na.INT;
        }
        return NumberUtils.createNumber(repr).intValue();
    }

    @Override
    public double nextDouble() {
        String repr = nextString();
        if (repr == null || !NumberUtils.isNumber(repr)) {
            return Na.DOUBLE;
        }
        return NumberUtils.createNumber(repr).doubleValue();
    }

    @Override
    public boolean hasNext() {
        return current < size();
    }

    @Override
    public void skip(int no) {
        if (current + no < size()) {
            current += no;
        }
    }

    @Override
    public int size() {
        return values.length;
    }
}