com.formkiq.vision.pdf.PDDocumentToNameTransformer 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 static org.apache.commons.lang3.StringUtils.isBlank;
import static org.apache.commons.lang3.StringUtils.isEmpty;

import java.util.Collection;
import java.util.function.Function;

import org.apache.pdfbox.pdmodel.PDDocument;

import com.formkiq.vision.document.DocumentText;

/**
 * Find {@link PDDocument} name.
 *
 */
public class PDDocumentToNameTransformer
        implements Function {

    /** {@link Collection} {@link PdfText}. */
    private Collection texts;

    /**
     * constructor.
     *
     * @param pdfTexts
     *            {@link Collection} {@link PdfText}
     */
    public PDDocumentToNameTransformer(final Collection pdfTexts) {
        this.texts = pdfTexts;
    }

    @Override
    public String apply(final PDDocument doc) {

        String title = doc.getDocumentInformation().getTitle();

        if (isBlank(title)) {

            float maxFont = this.texts.stream()
                    .map(s -> Float.valueOf(s.getFontSize()))
                    .max(Float::compare).get().floatValue();

            StringBuilder sb = new StringBuilder();

            for (DocumentText text : this.texts) {

                if ((int) text.getFontSize() == (int) maxFont) {
                    sb.append(text.getText() + " ");
                }
            }

            title = sb.toString();
        }

        title = isEmpty(title) ? "Untitled" : title.trim();

        return title;
    }
}