LocationSearcher.java

package net.coding.program.maopao;

import android.content.Context;
import android.text.TextUtils;

import com.baidu.mapapi.model.LatLng;

import net.coding.program.model.LocationObject;

import java.util.List;

/**
 * Created by Neutra on 2015/3/14.
 */
public abstract class LocationSearcher {
    private boolean isSearching = false;
    private boolean isComplete = false;
    private int keywordVersion;
    private int searchingVersion;
    private int page;
    private String keyword = "";

    public String getKeyword() {
        return keyword;
    }

    public boolean isKeywordEmpty() {
        return TextUtils.isEmpty(keyword);
    }

    public synchronized void setKeyword(String keyword) {
        keyword = keyword == null ? "" : keyword.toString();
        if (!keyword.equals(this.keyword)) {
            this.keyword = keyword;
            ++keywordVersion;
            page = 0;
            isSearching = false;
            isComplete = false;
        }
    }

    public boolean isComplete() {
        return isComplete;
    }

    public boolean isSearching() {
        return isSearching;
    }

    public synchronized void search() {
        if (isComplete || isSearching) return;
        isSearching = true;
        searchingVersion = ++keywordVersion;
        doSearch(page);
    }

    protected boolean shouldSkipThisResult() {
        isSearching = false;
        return searchingVersion != keywordVersion;
    }

    public void configure(Context context, LatLng latLng, final SearchResultListener listener) {
        isSearching = false;
        isComplete = false;
        page = 0;
        doConfigure(context, latLng, listener);
    }

    protected void scheduleNextPage() {
        ++page;
    }

    protected void setComplete(boolean isComplete) {
        this.isComplete = isComplete;
    }

    protected abstract void doConfigure(Context context, LatLng latLng, SearchResultListener listener);

    protected abstract void doSearch(int page);

    public abstract void destory();

    public static interface SearchResultListener {
        void onSearchResult(List<LocationObject> locations);
    }
}