JBoss Seam项目中EntityHome,EntityQuery是干什么的?

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JBoss Seam项目中EntityHome,EntityQuery是干什么的?10

项目中总是出现EntityHome,EntityQuery;求教这两个类是干什么的,请参照以下两端代码,帮我解释一下.最好逐行解释...本人实在是菜鸟一个,seam刚刚学习,但是上面催的紧...
另外求<<JBOSS SEAM WEB应用开发>>这本书的下载地址

import xxx.xxx.xxx.entity.*;
import java.math.BigDecimal;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.framework.EntityHome;

@Name("sysDepartUserHome")
public class SysDepartUserHome extends EntityHome<SysDepartUser> {

	@In(create = true)
	SysDepartInfoHome sysDepartInfoHome;
	@In(create = true)
	SysUserInfoHome sysUserInfoHome;

	public void setSysDepartUserAutoorder(Long id) {
		setId(id);
	}

	public Long getSysDepartUserAutoorder() {
		return (Long) getId();
	}

	@Override
	protected SysDepartUser createInstance() {
		SysDepartUser sysDepartUser = new SysDepartUser();
		return sysDepartUser;
	}

	public void load() {
		if (isIdDefined()) {
			wire();
		}
	}

	public void wire() {
		getInstance();
		SysDepartInfo sysDepartInfo = sysDepartInfoHome.getDefinedInstance();
		if (sysDepartInfo != null) {
			getInstance().setSysDepartInfo(sysDepartInfo);
		}
		SysUserInfo sysUserInfo = sysUserInfoHome.getDefinedInstance();
		if (sysUserInfo != null) {
			getInstance().setSysUserInfo(sysUserInfo);
		}
	}

	public boolean isWired() {
		return true;
	}

	public SysDepartUser getDefinedInstance() {
		return isIdDefined() ? getInstance() : null;
	}

}

还有这个

import xxx.xxx.xxx.entity.*;
import xxx.xxx.xxx.pub.Constants;

import org.jboss.seam.annotations.Name;
import org.jboss.seam.framework.EntityQuery;
import java.util.Arrays;

@Name("sysGroupPrivIncludeList")
public class SysGroupPrivIncludeList extends EntityQuery<SysGroupPrivInclude> {

	private static final String EJBQL = "select sysGroupPrivInclude from SysGroupPrivInclude sysGroupPrivInclude";

	private static final String[] RESTRICTIONS = { "lower(sysGroupPrivInclude.classId) like lower(concat(#{sysGroupPrivIncludeList.sysGroupPrivInclude.classId},'%'))", };

	private SysGroupPrivInclude sysGroupPrivInclude = new SysGroupPrivInclude();

	public SysGroupPrivIncludeList() {
		setEjbql(EJBQL);
		setRestrictionExpressionStrings(Arrays.asList(RESTRICTIONS));
		setMaxResults(Constants.NumberPerPage);
	}

	public SysGroupPrivInclude getSysGroupPrivInclude() {
		return sysGroupPrivInclude;
	}
}