de.vandermeer.skb.interfaces.messagesets.IsInfoSet.java Source code

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Here is the source code for de.vandermeer.skb.interfaces.messagesets.IsInfoSet.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.messagesets;

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

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

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

/**
 * Interface for objects that have a set of info messages.
 *
 * @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 IsInfoSet<M> extends IsMessageSet {

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

    /**
     * Clears all infos.
     */
    default void clearInfoMessages() {
        this.getInfoMessages().clear();
    }

    /**
     * Returns the info set.
     * @return info set, should not be null
     */
    Set<M> getInfoMessages();

    /**
     * Adds a new info.
     * @param info info to add
     */
    default void addInfo(M info) {
        this.getInfoMessages().add(info);
    }

    /**
     * Adds all infos from given collection.
     * @param infos collection of information to add
     */
    default void addAllInfos(Collection<M> infos) {
        this.getInfoMessages().addAll(infos);
    }

    /**
     * Tests if infos have been added.
     * @return true if infos are in the set, false otherwise
     */
    default boolean hasInformation() {
        return (this.getInfoMessages().size() == 0) ? false : true;
    }

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

    /**
     * Creates a new info set.
     * @param <M> type of the messages in the set
     * @return new info set
     */
    static <M> IsInfoSet<M> create() {
        return new IsInfoSet<M>() {
            final Set<M> infoSet = new LinkedHashSet<>();

            @Override
            public Set<M> getInfoMessages() {
                return this.infoSet;
            }
        };
    }
}