com.marklogic.client.impl.BasicPage Maven / Gradle / Ivy

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/*
 * Copyright 2012-2015 MarkLogic Corporation
 *
 * 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.marklogic.client.impl;

import java.util.Iterator;
import com.marklogic.client.Page;

public class BasicPage implements Page {
    private Iterator iterator;
    private long start;
    private Long size = null;
    private long pageSize;
    private long totalSize;

    protected BasicPage(Class type) {
    }

    public BasicPage(Iterator iterator, long start, long pageSize, long totalSize) {
        this.iterator = iterator;
        this.start = start;
        this.pageSize = pageSize;
        this.totalSize = totalSize;
    }

    public Iterator iterator() {
        return iterator;
    }
    
    public boolean hasNext() {
        return iterator.hasNext();
    }

    public T next() {
        return iterator.next();
    }

    public long getStart() {
        return start;
    }

    public BasicPage setStart(long start) {
        this.start = start;
		return this;
    }

    public long getPageSize() {
        return pageSize;
    }

    public BasicPage setPageSize(long pageSize) {
        this.pageSize = pageSize;
		return this;
    }

    public long getTotalSize() {
        return totalSize;
    }

    public BasicPage setTotalSize(long totalSize) {
        this.totalSize = totalSize;
		return this;
    }

    public BasicPage setSize(long size) {
        this.size = new Long(size);
		return this;
    }

    public long size() {
        if ( size != null ) return size.longValue();
        if ( getPageSize() == 0 ) {
            return 0;
        } else if ( hasNextPage() ) {
            return getPageSize();
        } else if ((getTotalSize() % getPageSize()) == 0) {
            return getPageSize();
        } else {
            return getTotalSize() % getPageSize();
        }
    }

    public long getTotalPages() {
        if ( getPageSize() == 0 ) return 0;
        return (long) Math.ceil((double) getTotalSize() / (double) getPageSize());
    }

    public boolean hasContent() {
        return size() > 0;
    }

    public boolean hasNextPage() {
        return getPageNumber() < getTotalPages();
    }

    public boolean hasPreviousPage() {
        return getPageNumber() > 1;
    }

    public long getPageNumber() {
        if ( getPageSize() == 0 ) return 0;
        double _start = (double) start;
        double _pageSize = (double) getPageSize();
        if ( _start % _pageSize == 0 ) return new Double(_start / _pageSize).longValue();
        else return (long) Math.floor(_start / _pageSize) + 1;
    }

    public boolean isFirstPage() {
        if ( getPageSize() == 0 ) return true;
        return getPageNumber() == 1;
    }

    public boolean isLastPage() {
        if ( getPageSize() == 0 ) return true;
        return getPageNumber() == getTotalPages();
    }
}