de.vandermeer.skb.interfaces.coin.TailsNullWithErrors.java Source code

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Here is the source code for de.vandermeer.skb.interfaces.coin.TailsNullWithErrors.java

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/* Copyright 2016 Sven van der Meer <vdmeer.sven@mykolab.com>
 *
 * 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 de.vandermeer.skb.interfaces.coin;

import java.util.LinkedHashSet;
import java.util.Set;

import org.apache.commons.lang3.text.StrBuilder;

import de.vandermeer.skb.interfaces.messagesets.IsErrorSet;
import de.vandermeer.skb.interfaces.render.DoesRender;

/**
 * A tails (error) coin without a value but some errors.
 *
 * @author     Sven van der Meer &lt;vdmeer.sven@mykolab.com&gt;
 * @version    v0.0.2 build 170502 (02-May-17) for Java 1.8
 * @since      v0.0.1
 */
public interface TailsNullWithErrors<M> extends TailsNull, IsErrorSet<M> {

    @Override
    default boolean reportsErrors() {
        return true;
    }

    @Override
    default boolean hasErrorReports() {
        return this.hasErrors();
    }

    /**
     * Renders the error set.
     * The method uses {@link DoesRender} or simple toString to render errors.
     * Each element in the error set is rendered in a single line, preceded by the type (error).
     * @return rendered object
     */
    @Override
    default String render() {
        StrBuilder ret = new StrBuilder(100);
        for (M m : this.getErrorMessages()) {
            ret.append("errors: ");
            if (m instanceof DoesRender) {
                ret.append(((DoesRender) m).render());
            } else {
                ret.append(m);
            }
            ret.appendNewLine();
        }
        return ret.toString();
    }

    /**
     * Creates a new null coin with given value and errors.
     * @param <M> the message type for the set
     * @return new error coin
     */
    static <M> TailsNullWithErrors<M> create() {
        return new TailsNullWithErrors<M>() {
            final Set<M> errorSet = new LinkedHashSet<>();

            @Override
            public Set<M> getErrorMessages() {
                return this.errorSet;
            }
        };
    }
}