org.springside.modules.orm中的page类自我解读

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
import java.util.Collections;
import java.util.List;
import org.apache.commons.lang.StringUtils;

public class Page<T> {

/*静态变量，用于设置结果是按照正序排列还是反序排列*/
public static final String ASC = "asc";
public static final String DESC = "desc";

/*当前页码*/
protected int pageNo = 1;
/*页面容量*/
protected int pageSize = 1;
/*orderBy表示通过那个进行排序，比如说：id*/
protected String orderBy = null;
/*order是设置以哪种方式进行排序：可以使ASC也可以是DESC*/
protected String order = null;
/*只是是否自动计算*/
protected boolean autoCount = true;

/*以下2个参数常作为 分页所需的"返回结果"! */
//result表示当页面存在的实体类集合。
protected List<T> result = Collections.emptyList();
//totalCount表示当前页面总条数。
protected long totalCount = -1L;

public Page() {
}

public Page(int pageSize) {
this.setPageSize(pageSize);
}

public Page(int pageSize, boolean autoCount) {
this.setPageSize(pageSize);
this.setAutoCount(autoCount);
}

public int getPageNo() {
return this.pageNo;
}

public void setPageNo(int pageNo) {
this.pageNo = pageNo;
if(pageNo < 1) {
this.pageNo = 1;
}

}

public int getPageSize() {
return this.pageSize;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
if(pageSize < 0) {
this.pageSize = 1;
}

}

/**
* 获得当前页面第一条数据的排列
* @return
*/
public int getFirst() {
return (this.pageNo - 1) * this.pageSize + 1;
}

public String getOrderBy() {
return this.orderBy;
}

public void setOrderBy(String orderBy) {
this.orderBy = orderBy;
}

public boolean isOrderBySetted() {
return StringUtils.isNotBlank(this.orderBy) && StringUtils.isNotBlank(this.order);
}

public String getOrder() {
return this.order;
}

public void setOrder(String order) {
String[] orders = StringUtils.split(StringUtils.lowerCase(order), ',');
String[] var6 = orders;
int var5 = orders.length;

for(int var4 = 0; var4 < var5; ++var4) {
String orderStr = var6[var4];
if(!StringUtils.equals("desc", orderStr) && !StringUtils.equals("asc", orderStr)) {
throw new IllegalArgumentException("排序方向" + orderStr + "不是合法值");
}
}

this.order = StringUtils.lowerCase(order);
}

public boolean isAutoCount() {
return this.autoCount;
}

public void setAutoCount(boolean autoCount) {
this.autoCount = autoCount;
}

public List<T> getResult() {
return this.result;
}

public void setResult(List<T> result) {
this.result = result;
}

public long getTotalCount() {
return this.totalCount;
}

public void setTotalCount(long totalCount) {
this.totalCount = totalCount;
}

/**
* 获取一共有多少页（设置的是总条数）
* @return
*/
public long getTotalPages() {
if(this.totalCount < 0L) {
return -1L;
} else {
long count = this.totalCount / (long)this.pageSize;
if(this.totalCount % (long)this.pageSize > 0L) {
++count;
}

return count;
}
}

/**
* 是否还有下一页
* @return
*/
public boolean isHasNext() {
return (long)(this.pageNo + 1) <= this.getTotalPages();
}

/**
* 得到下一页的页码
* @return
*/
public int getNextPage() {
return this.isHasNext()?this.pageNo + 1:this.pageNo;
}

/**
* 是否有上一页
* @return
*/
public boolean isHasPre() {
return this.pageNo - 1 >= 1;
}

/**
* 得到上一页页码
* @return
*/
public int getPrePage() {
return this.isHasPre()?this.pageNo - 1:this.pageNo;
}
}