我试图使用Java Spatial Index Library,但无法加载examples。TIntProcedure无法解析
当我尝试打开以下文件,从例子中,在Eclipse开普勒,Eclipse的抱怨TIntProcedure
不能够得到解决:
package net.sourceforge.jsi.examples;
import gnu.trove.*;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.infomatiq.jsi.Rectangle;
import com.infomatiq.jsi.SpatialIndex;
import com.infomatiq.jsi.rtree.RTree;
public class Contains {
private static final Logger log = LoggerFactory.getLogger(Contains.class);
public static void main(String[] args) {
new Contains().run();
}
private void run() {
// Create and initialize an rtree
SpatialIndex si = new RTree();
si.init(null);
// We have some points or rectangles in some other data structure.
// The rtree can handle millions of these.
Rectangle[] rects = new Rectangle[] {
new Rectangle(0, 0, 0, 0),
new Rectangle(0, 1, 0, 1),
new Rectangle(1, 0, 1, 0),
new Rectangle(1, 1, 1, 1),
};
// Add our data to the rtree. Every time we add a rectangle we give it
// an ID. This ID is what is returned by querying the rtree. In this
// example we use the array index as the ID.
for (int i = 0; i < rects.length; i++) {
si.add(rects[i], i);
}
// Now see which of these points is contained by some
// other rectangle. The rtree returns the results of a query
// by calling the execute() method on a TIntProcedure.
// In this example we want to save the results of the query
// into a list, so that's what the execute() method does.
class SaveToListProcedure implements TIntProcedure {
private List<Integer> ids = new ArrayList<Integer>();
@Override
public boolean execute(int id) {
ids.add(id);
return true;
};
private List<Integer> getIds() {
return ids;
}
};
SaveToListProcedure myProc = new SaveToListProcedure();
si.contains(new Rectangle(-0.5f, -0.5f, 1.5f, 0.5f), myProc);
List<Integer> ids = myProc.getIds();
for (Integer id : ids) {
log.info(rects[id].toString() + " was contained");
}
// Actually that was a really long winded (and inefficient) way of
// printing out the rectangles. Would be better to use an anonymous
// class to just do the printing inside the execute method. That is
// what the NearestN class does.
}
}
TIntProcedure
似乎是从gnu trove包,但TIntProcedure
接口实际上在gnu.trove.procedure
中定义,而不是gnu.trove
。
我使用错了TIntProcedure
? Eclipse对SaveToListProcedure
的声明没有问题,但在si.contains(new Rectangle(-0.5f, -0.5f, 1.5f, 0.5f), myProc)
处显示警告。我想反正运行项目,只是为了看看Eclipse的被扔一个虚假的错误,但有错误了:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
at net.sourceforge.jsi.examples.Contains.main(Contains.java:18)
线18是在main
定义。
对不起,我错过了你的答案。谢谢您的帮助! –