builder-设计模式

package com.wp.java.builder;

import org.junit.Test;

public class DoDoContactDemo {

    @Test
    public void test(){
        DoDoContact contact = new DoDoContact.Builder("jack").address("lundun").safeID(5).age(10).build();

    }
}

class DoDoContact {
    private  int age;
    private  int safeID;
    private  String name;
    private String address;

    public int getAge() {
        return age;
    }
    public int getSafeID() {
        return safeID;
    }
    public String getName() {
        return name;
    }
    public String getAddress() {
        return address;
    }

     static class Builder{
         private int age=0;
         private int safeID =0;
         private String name=null;
         private String address = null;

         public Builder(String name){
             this.name = name;
         }

         public Builder age(int age){
             this.age = age;
             return this;
         }

         public Builder safeID(int safeID){
             this.safeID = safeID;
             return this;
         }

         public Builder address(String address){
             this.address = address;
             return this;
         }

         public DoDoContact build(){
             return new DoDoContact(this);
         }
     }

     private DoDoContact(Builder b){
         age = b.age;
         name = b.name;
         safeID = b.safeID;
         address = b.address;
     }

}

package com.wp.java.builder;

import org.junit.Test;
/**
 * Builder 模式
 * */
public class CardDemo {
    @Test
    public void test(){
        Card con = new ConcreteCard();
        Director dir = new Director(con);
        dir.construct();
    }
}

interface Card {
    void createPardA();
    void createPardB();
    void createPardC();
}

class ConcreteCard implements Card{

    @Override
    public void createPardA() {

    }

    @Override
    public void createPardB() {

    }

    @Override
    public void createPardC() {

    }

}

class Director {
    private Card card;

    public Director(Card card) {
        super();
        this.card = card;
    }

    public void construct(){
        card.createPardA();
        card.createPardB();
        card.createPardC();
    }
}

上面都是简单的测试案例,下面将接触到的框架中原样,Universal-Image-Loader,相信有部分搞android开发的哥们是有点眼熟的,看代码吧

package com.nostra13.universalimageloader.core;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory.Options;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.BitmapDisplayer;
import com.nostra13.universalimageloader.core.display.SimpleBitmapDisplayer;
import com.nostra13.universalimageloader.core.download.ImageDownloader;
import com.nostra13.universalimageloader.core.process.BitmapProcessor;

public final class DisplayImageOptions {

    private final int imageResOnLoading;
    private final int imageResForEmptyUri;
    private final int imageResOnFail;
    private final Drawable imageOnLoading;
    private final Drawable imageForEmptyUri;
    private final Drawable imageOnFail;
    private final boolean resetViewBeforeLoading;
    private final boolean cacheInMemory;
    private final boolean cacheOnDisk;
    private final ImageScaleType imageScaleType;
    private final Options decodingOptions;
    private final int delayBeforeLoading;
    private final boolean considerExifParams;
    private final Object extraForDownloader;
    private final BitmapProcessor preProcessor;
    private final BitmapProcessor postProcessor;
    private final BitmapDisplayer displayer;
    private final Handler handler;
    private final boolean isSyncLoading;

    private DisplayImageOptions(Builder builder) {
        imageResOnLoading = builder.imageResOnLoading;
        imageResForEmptyUri = builder.imageResForEmptyUri;
        imageResOnFail = builder.imageResOnFail;
        imageOnLoading = builder.imageOnLoading;
        imageForEmptyUri = builder.imageForEmptyUri;
        imageOnFail = builder.imageOnFail;
        resetViewBeforeLoading = builder.resetViewBeforeLoading;
        cacheInMemory = builder.cacheInMemory;
        cacheOnDisk = builder.cacheOnDisk;
        imageScaleType = builder.imageScaleType;
        decodingOptions = builder.decodingOptions;
        delayBeforeLoading = builder.delayBeforeLoading;
        considerExifParams = builder.considerExifParams;
        extraForDownloader = builder.extraForDownloader;
        preProcessor = builder.preProcessor;
        postProcessor = builder.postProcessor;
        displayer = builder.displayer;
        handler = builder.handler;
        isSyncLoading = builder.isSyncLoading;
    }

    public boolean shouldShowImageOnLoading() {
        return imageOnLoading != null || imageResOnLoading != 0;
    }

    public boolean shouldShowImageForEmptyUri() {
        return imageForEmptyUri != null || imageResForEmptyUri != 0;
    }

    public boolean shouldShowImageOnFail() {
        return imageOnFail != null || imageResOnFail != 0;
    }

    public boolean shouldPreProcess() {
        return preProcessor != null;
    }

    public boolean shouldPostProcess() {
        return postProcessor != null;
    }

    public boolean shouldDelayBeforeLoading() {
        return delayBeforeLoading > 0;
    }

    public Drawable getImageOnLoading(Resources res) {
        return imageResOnLoading != 0 ? res.getDrawable(imageResOnLoading) : imageOnLoading;
    }

    public Drawable getImageForEmptyUri(Resources res) {
        return imageResForEmptyUri != 0 ? res.getDrawable(imageResForEmptyUri) : imageForEmptyUri;
    }

    public Drawable getImageOnFail(Resources res) {
        return imageResOnFail != 0 ? res.getDrawable(imageResOnFail) : imageOnFail;
    }

    public boolean isResetViewBeforeLoading() {
        return resetViewBeforeLoading;
    }

    public boolean isCacheInMemory() {
        return cacheInMemory;
    }

    public boolean isCacheOnDisk() {
        return cacheOnDisk;
    }

    public ImageScaleType getImageScaleType() {
        return imageScaleType;
    }

    public Options getDecodingOptions() {
        return decodingOptions;
    }

    public int getDelayBeforeLoading() {
        return delayBeforeLoading;
    }

    public boolean isConsiderExifParams() {
        return considerExifParams;
    }

    public Object getExtraForDownloader() {
        return extraForDownloader;
    }

    public BitmapProcessor getPreProcessor() {
        return preProcessor;
    }

    public BitmapProcessor getPostProcessor() {
        return postProcessor;
    }

    public BitmapDisplayer getDisplayer() {
        return displayer;
    }

    public Handler getHandler() {
        return handler;
    }

    boolean isSyncLoading() {
        return isSyncLoading;
    }

    /**
     * Builder for {@link DisplayImageOptions}
     */
    public static class Builder {
        private int imageResOnLoading = 0;
        private int imageResForEmptyUri = 0;
        private int imageResOnFail = 0;
        private Drawable imageOnLoading = null;
        private Drawable imageForEmptyUri = null;
        private Drawable imageOnFail = null;
        private boolean resetViewBeforeLoading = false;
        private boolean cacheInMemory = false;
        private boolean cacheOnDisk = false;
        private ImageScaleType imageScaleType = ImageScaleType.IN_SAMPLE_POWER_OF_2;
        private Options decodingOptions = new Options();
        private int delayBeforeLoading = 0;
        private boolean considerExifParams = false;
        private Object extraForDownloader = null;
        private BitmapProcessor preProcessor = null;
        private BitmapProcessor postProcessor = null;
        private BitmapDisplayer displayer = DefaultConfigurationFactory.createBitmapDisplayer();
        private Handler handler = null;
        private boolean isSyncLoading = false;

        @Deprecated
        public Builder showStubImage(int imageRes) {
            imageResOnLoading = imageRes;
            return this;
        }

        public Builder showImageOnLoading(int imageRes) {
            imageResOnLoading = imageRes;
            return this;
        }

        public Builder showImageOnLoading(Drawable drawable) {
            imageOnLoading = drawable;
            return this;
        }

        public Builder showImageForEmptyUri(int imageRes) {
            imageResForEmptyUri = imageRes;
            return this;
        }

        public Builder showImageForEmptyUri(Drawable drawable) {
            imageForEmptyUri = drawable;
            return this;
        }

        public Builder showImageOnFail(int imageRes) {
            imageResOnFail = imageRes;
            return this;
        }

        public Builder showImageOnFail(Drawable drawable) {
            imageOnFail = drawable;
            return this;
        }

        public Builder resetViewBeforeLoading() {
            resetViewBeforeLoading = true;
            return this;
        }

        public Builder resetViewBeforeLoading(boolean resetViewBeforeLoading) {
            this.resetViewBeforeLoading = resetViewBeforeLoading;
            return this;
        }

        @Deprecated
        public Builder cacheInMemory() {
            cacheInMemory = true;
            return this;
        }

        public Builder cacheInMemory(boolean cacheInMemory) {
            this.cacheInMemory = cacheInMemory;
            return this;
        }

        @Deprecated
        public Builder cacheOnDisc() {
            return cacheOnDisk(true);
        }

        @Deprecated
        public Builder cacheOnDisc(boolean cacheOnDisk) {
            return cacheOnDisk(cacheOnDisk);
        }

        /** Sets whether loaded image will be cached on disk */
        public Builder cacheOnDisk(boolean cacheOnDisk) {
            this.cacheOnDisk = cacheOnDisk;
            return this;
        }

        public Builder imageScaleType(ImageScaleType imageScaleType) {
            this.imageScaleType = imageScaleType;
            return this;
        }

        public Builder bitmapConfig(Bitmap.Config bitmapConfig) {
            if (bitmapConfig == null) throw new IllegalArgumentException("bitmapConfig can't be null");
            decodingOptions.inPreferredConfig = bitmapConfig;
            return this;
        }

        public Builder decodingOptions(Options decodingOptions) {
            if (decodingOptions == null) throw new IllegalArgumentException("decodingOptions can't be null");
            this.decodingOptions = decodingOptions;
            return this;
        }

        public Builder delayBeforeLoading(int delayInMillis) {
            this.delayBeforeLoading = delayInMillis;
            return this;
        }

        public Builder extraForDownloader(Object extra) {
            this.extraForDownloader = extra;
            return this;
        }

        public Builder considerExifParams(boolean considerExifParams) {
            this.considerExifParams = considerExifParams;
            return this;
        }

        public Builder preProcessor(BitmapProcessor preProcessor) {
            this.preProcessor = preProcessor;
            return this;
        }

        public Builder postProcessor(BitmapProcessor postProcessor) {
            this.postProcessor = postProcessor;
            return this;
        }

        public Builder displayer(BitmapDisplayer displayer) {
            if (displayer == null) throw new IllegalArgumentException("displayer can't be null");
            this.displayer = displayer;
            return this;
        }

        Builder syncLoading(boolean isSyncLoading) {
            this.isSyncLoading = isSyncLoading;
            return this;
        }

        public Builder handler(Handler handler) {
            this.handler = handler;
            return this;
        }

        /** Sets all options equal to incoming options */
        public Builder cloneFrom(DisplayImageOptions options) {
            imageResOnLoading = options.imageResOnLoading;
            imageResForEmptyUri = options.imageResForEmptyUri;
            imageResOnFail = options.imageResOnFail;
            imageOnLoading = options.imageOnLoading;
            imageForEmptyUri = options.imageForEmptyUri;
            imageOnFail = options.imageOnFail;
            resetViewBeforeLoading = options.resetViewBeforeLoading;
            cacheInMemory = options.cacheInMemory;
            cacheOnDisk = options.cacheOnDisk;
            imageScaleType = options.imageScaleType;
            decodingOptions = options.decodingOptions;
            delayBeforeLoading = options.delayBeforeLoading;
            considerExifParams = options.considerExifParams;
            extraForDownloader = options.extraForDownloader;
            preProcessor = options.preProcessor;
            postProcessor = options.postProcessor;
            displayer = options.displayer;
            handler = options.handler;
            isSyncLoading = options.isSyncLoading;
            return this;
        }

        /** Builds configured {@link DisplayImageOptions} object */
        public DisplayImageOptions build() {
            return new DisplayImageOptions(this);
        }
    }

    public static DisplayImageOptions createSimple() {
        return new Builder().build();
    }
}