com.amihaiemil.eoyaml.ReadYamlStream Maven / Gradle / Ivy

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YAML for Java 8 and above. Very similar to the JSON-P api.
The newest version!
/**
 * Copyright (c) 2016-2024, Mihai Emil Andronache
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 * Neither the name of the copyright holder nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
package com.amihaiemil.eoyaml;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Read YAML Stream of documents.
 * @author Mihai Andronache ([email protected])
 * @version $Id: 9dd3572acc6621dc727812f14225f72e03786375 $
 * @since 3.1.4
 */
final class ReadYamlStream extends BaseYamlStream {

    /**
     * All the lines of this YamlStream.
     */
    private final YamlLines all;

    /**
     * Read lines of this YAML Stream.
     */
    private final YamlLines startMarkers;

    /**
     * Constructor.
     * @param lines All YAML lines as they are read from the input.
     */
    ReadYamlStream(final AllYamlLines lines) {
        this.startMarkers = new WellIndented(
            new StartMarkers(
                new Skip(
                    lines,
                    line -> line.trimmed().startsWith("#"),
                    line -> line.trimmed().startsWith("%")
                )
            )
        );
        this.all = new Skip(
            lines,
            line -> line.trimmed().startsWith("%")
        );
    }

    @Override
    public Collection values() {
        final List values = new ArrayList<>();
        for(final YamlLine startDoc : this.startMarkers) {
            final YamlLines document = this.readDocument(startDoc);
            if(document.iterator().hasNext()) {
                values.add(
                    document.nextYamlNode(startDoc)
                );
            }
        }
        return values;
    }

    /**
     * Read a document from this Stream.
     * @param start Start marker of the document.
     * @return YamlLines of the read document.
     */
    private YamlLines readDocument(final YamlLine start) {
        final List yamlDocLines = new ArrayList<>();
        final YamlLines docComment = new Backwards(
            new FirstCommentFound(
                new Backwards(
                    new Skip(this.all, (line) -> line.number() > start.number())
                ), true
            )
        );
        for (final YamlLine line: docComment){
            yamlDocLines.add(line);
        }
        for(final YamlLine line : this.all) {
            if(line.number() > start.number()) {
                final String current = line.trimmed();
                if("---".equals(current) || "...".equals(current)) {
                    break;
                } else {
                    yamlDocLines.add(line);
                }
            }
        }
        return new AllYamlLines(yamlDocLines);
    }

}