com.formkiq.vision.pdf.TextVerticalMergeFunction Maven / Gradle / Ivy

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/*
 * Copyright (C) 2018 FormKiQ Inc.
 *
 * 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.formkiq.vision.pdf;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

import com.formkiq.vision.crafter.DocumentRowLayout;
import com.formkiq.vision.document.DocumentText;
import com.formkiq.vision.predicate.TextHasLettersPredicate;

/**
 * {@link Function} to merge similar {@link DocumentText} together.
 *
 */
public class TextVerticalMergeFunction implements
        Function>, Map>> {

    /** {@link Collection} {@link DocumentRowLayout}. */
    private Collection documentRows;

    /** Document Field Map by Page Number. */
    private Map> fieldMap;

    /**
     * constructor.
     * @param rows {@link Collection} {@link DocumentRowLayout}
     * @param map {@link Map} {@link PdfField}
     */
    public TextVerticalMergeFunction(final Collection rows,
            final Map> map) {
        this.documentRows = rows;
        this.fieldMap = map;
    }

    @Override
    public Map> apply(
            final Map> textMap) {

        for (Map.Entry> e : textMap.entrySet()) {

            Integer pageNumber = e.getKey();
            TextHasLettersPredicate hp = new TextHasLettersPredicate();

            List fields = this.fieldMap.getOrDefault(pageNumber,
                    Collections.emptyList());

            List texts = e.getValue().stream().filter(hp)
                    .collect(Collectors.toList());

            PdfTextJoiningVerticalTransformer vt =
                    new PdfTextJoiningVerticalTransformer(
                            this.documentRows, texts, fields);

            for (DocumentText text : new ArrayList<>(texts)) {

                List result = vt.apply(text);

                if (result.size() > 1) {

                    text.setText(result.stream().map(s -> s.getText().trim())
                            .collect(Collectors.joining(" ")));

					text.setUpperRightX(result.stream().map(r -> Float.valueOf(r.getUpperRightX()))
							.max(Comparator.naturalOrder()).get().floatValue());

					text.setLowerLeftY(result.stream()
							.map(r -> Float.valueOf(r.getLowerLeftY()))
							.min(Comparator.naturalOrder()).get().floatValue());

                    List subList = result.subList(1, result.size());
                    e.getValue().removeAll(subList);
                }
            }
        }

        return textMap;
    }
}