ru.org.linux.paginator.PagesInfo.java Source code

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Here is the source code for ru.org.linux.paginator.PagesInfo.java

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/*
 * Copyright 1998-2016 Linux.org.ru
 *    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 ru.org.linux.paginator;

import com.google.common.collect.ImmutableList;

import java.util.List;

public class PagesInfo {
    private final ImmutableList<Page> pageLinks;

    private final boolean hasPrevious;
    private final boolean hasNext;

    private final String previous;
    private final String next;

    public PagesInfo(List<String> pageLinks, int currentPage) {
        ImmutableList.Builder<Page> builder = ImmutableList.builder();

        for (int i = 0; i < pageLinks.size(); i++) {
            builder.add(new Page(pageLinks.get(i), i, i == currentPage));
        }

        this.pageLinks = builder.build();

        hasPrevious = currentPage > 0;
        hasNext = currentPage >= 0 && (currentPage < pageLinks.size() - 1);

        if (hasPrevious) {
            previous = this.pageLinks.get(currentPage - 1).getUrl();
        } else {
            previous = null;
        }

        if (hasNext) {
            next = this.pageLinks.get(currentPage + 1).getUrl();
        } else {
            next = null;
        }
    }

    public ImmutableList<Page> getPageLinks() {
        return pageLinks;
    }

    public boolean isHasPrevious() {
        return hasPrevious;
    }

    public boolean isHasNext() {
        return hasNext;
    }

    public String getPrevious() {
        return previous;
    }

    public String getNext() {
        return next;
    }

    public static class Page {
        private final String url;
        private final int index;
        private final boolean current;

        public Page(String url, int index, boolean current) {
            this.url = url;
            this.index = index;
            this.current = current;
        }

        public String getUrl() {
            return url;
        }

        public int getIndex() {
            return index;
        }

        public boolean isCurrent() {
            return current;
        }
    }
}