JHotDraw的IO问题

c.zhiwu

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jhotdraw

prototype XML

您好！请教一个问题：jhotdraw7.6中samples中draw实例中有个file菜单中有个“open”的功能，可以根据xml文件生成图形，请问这个功能的代码在哪儿？谢谢

你好，我用的是7.5的版本，我想应该是一样的。

实现机制：
draw的存储接口是DOMStorable，负责drawing的IO操作；所有继承或实现该接口的子类都必须实现了read和write方法，即实现具体类的读入和写出责任。AbstractAttributedFigure和Drawing都继承该接口。

读取文件的顺序为：

openAction读入文件，调用DrawView的read方法读取该文件；
DrawView中维护多个inputFormat，每个inputFormat负责读取特定的Figure；当调用read方法时，DrawView尝试让所有的inputFormat读取该文件，但只要有一个inputFormat读取成功就停止。

至于DrawView装载了多少InputFromat，可以参考org.jhotdraw.samples.draw.DrawView.createDrawing()：

 protected Drawing createDrawing() {
        Drawing drawing = new QuadTreeDrawing();
        DOMStorableInputOutputFormat ioFormat =
                new DOMStorableInputOutputFormat(new DrawFigureFactory());
        
        drawing.addInputFormat(ioFormat);
        ImageFigure prototype = new ImageFigure();
        drawing.addInputFormat(new ImageInputFormat(prototype));
        drawing.addInputFormat(new TextInputFormat(new TextFigure()));
        TextAreaFigure taf = new TextAreaFigure();
        taf.setBounds(new Point2D.Double(10,10), new Point2D.Double(60,40));
        drawing.addInputFormat(new TextInputFormat(taf));
        
        drawing.addOutputFormat(ioFormat);
        drawing.addOutputFormat(new ImageOutputFormat());
        return drawing;
    }

参考org.jhotdraw.draw.LineConnectionFigure对write()和read()的实现：

 

//org.jhotdraw.draw.LineConnectionFigure.read
public void read(DOMInput in) throws IOException {
        readAttributes(in);
        readLiner(in);

        // Note: Points must be read after Liner, because Liner influences
        // the location of the points.
        readPoints(in);
    }

//org.jhotdraw.draw.AbstractAttributedFigure.readAttributes
 protected void readAttributes(DOMInput in) throws IOException {
        if (in.getElementCount("a") > 0) {
            in.openElement("a");
            for (int i=in.getElementCount() - 1; i >= 0; i-- ) {
                in.openElement(i);
                String name = in.getTagName();
                Object value = in.readObject();
                AttributeKey key = getAttributeKey(name);
                if (key != null && key.isAssignable(value)) {
                    if (forbiddenAttributes == null
                            || ! forbiddenAttributes.contains(key)) {
                        set(key, value);
                    }
                }
                in.closeElement();
            }
            in.closeElement();
        }
    }




 protected void readLiner(DOMInput in) throws IOException {
        if (in.getElementCount("liner") > 0) {
            in.openElement("liner");
            liner = (Liner) in.readObject();
            in.closeElement();
        } else {
            liner = null;
        }

    }


//org.jhotdraw.draw.LineConnectionFigure.readPoints
 protected void readPoints(DOMInput in) throws IOException {
        super.readPoints(in);
        in.openElement("startConnector");
        setStartConnector((Connector) in.readObject());
        in.closeElement();
        in.openElement("endConnector");
        setEndConnector((Connector) in.readObject());
        in.closeElement();
    }

读入机制参见：
org.jhotdraw.app.action.file.OpenFileAction#openViewFromURI() line 105
org.jhotdraw.samples.draw.DrawView#read()
org.jhotdraw.xml.DOMFactory

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单例模式和软引用[Soft Singleton Idiom] | Java7异常新特性之mutilcatch

2011-04-08 14:41
浏览 1704
评论(5)
分类:编程语言
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5 楼 sxpyrgz 2011-10-20

c.zhiwu 写道

sxpyrgz 写道

哥门儿你在玩JHOTDRAW吗?

我也在整，不过过程中还有不少的问题

4 楼 c.zhiwu 2011-10-13

sxpyrgz 写道

哥门儿你在玩JHOTDRAW吗?

3 楼 sxpyrgz 2011-10-12

哥门儿你在玩JHOTDRAW吗?

2 楼 c.zhiwu 2011-05-11

是在实现Figure的具体类中实现IO的，如果要修改，可以参考Figure的子类。

1 楼 hust_axu 2011-05-06

您好，请教一个问题。我想讲他自动生成的xml代码
<drawing>
- <figures>
- <start-state id="0" x="40" y="49" w="60" h="40" name="开始">
- <a>
- <fontFace>

</fontFace>
- <fontSize>
<double id="2">20.0</double>
</fontSize>
</a>
<transition name="到拟稿" to="拟稿" />
</start-state>
- <task-node id="3" x="42" y="148" w="60" h="40" name="拟稿">
- <a>
- <text>
<string id="4">拟稿</string>
</text>
- <fontFace>

</fontFace>
- <fontSize>
<double ref="2" />
</fontSize>
</a>
<transition name="到审批" to="审批" />
- <task name="拟稿">
<description>draft</description>
<assignment class="test.assignment.DraftAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
</task-node>
- <task-node id="5" x="40" y="238" w="60" h="40" name="审批">
- <a>
- <text>
<string id="6">审批</string>
</text>
- <fontFace>

</fontFace>
- <fontSize>
<double ref="2" />
</fontSize>
</a>
<transition name="到判断" to="判断" />
- <task name="审批">
<description>examine</description>
<assignment class="test.assignment.ExamineAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
</task-node>
- <task-node id="7" x="40" y="346" w="60" h="40" name="成文">
- <a>
- <text>
<string id="8">成文</string>
</text>
- <fontFace>

</fontFace>
- <fontSize>
<double ref="2" />
</fontSize>
</a>
<transition name="到传阅" to="传阅" />
- <task name="成文">
<description>write</description>
<assignment class="test.assignment.WriteAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
</task-node>
- <task-node id="9" x="187" y="344" w="60" h="40" name="传阅">
- <a>
- <text>
<string id="a">传阅</string>
</text>
- <fontFace>

</fontFace>
- <fontSize>
<double ref="2" />
</fontSize>
</a>
<transition name="到归档" to="归档" />
- <task name="传阅">
<description>read</description>
<assignment class="test.assignment.ReadAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
</task-node>
- <decision id="b" x="179" y="232" w="60" h="40" name="判断">
- <a>
- <fillColor>
<color id="c" rgba="#ffffff00" />
</fillColor>
- <fontFace>

</fontFace>
- <fontSize>
<double ref="2" />
</fontSize>
</a>
<transition name="同意" to="成文" />
<transition name="不同意" to="拟稿" />
<handler class="test.handler.TestDecisionHandler" />
</decision>
- <end-state id="d" x="462" y="337" w="60" h="40" name="结束">
- <a>
- <fillColor>
<color id="e" rgba="#ffff0000" />
</fillColor>
- <fontFace>

</fontFace>
- <fontSize>
<double ref="2" />
</fontSize>
</a>
</end-state>
- <task-node id="f" x="313" y="343" w="60" h="40" name="归档">
- <a>
- <text>
<string id="10">归档</string>
</text>
- <fontFace>

</fontFace>
- <fontSize>
<double ref="2" />
</fontSize>
</a>
<transition name="到结束" to="结束" />
- <task name="归档">
<description>file</description>
<assignment class="test.assignment.FileAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
</task-node>
- <transition id="11">
- <points>


</points>
- <startConnector>
- <rConnector id="12">
- <Owner>
<start-state ref="0" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="13">
- <Owner>
<task-node ref="3" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color id="14" rgba="#ff000000" />
</strokeColor>
- <strokeWidth>
<double id="15">1.0</double>
</strokeWidth>
</a>
</transition>
- <transition id="16">
- <points>


</points>
- <startConnector>
- <rConnector id="17">
- <Owner>
<task-node ref="3" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="18">
- <Owner>
<task-node ref="5" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color ref="14" />
</strokeColor>
- <strokeWidth>
<double ref="15" />
</strokeWidth>
</a>
</transition>
- <transition id="19">
- <points>


</points>
- <startConnector>
- <rConnector id="1a">
- <Owner>
<task-node ref="5" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="1b">
- <Owner>
<decision ref="b" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color ref="14" />
</strokeColor>
- <strokeWidth>
<double ref="15" />
</strokeWidth>
</a>
</transition>
- <transition id="1c">
- <points>


</points>
- <startConnector>
- <rConnector id="1d">
- <Owner>
<decision ref="b" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="1e">
- <Owner>
<task-node ref="3" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color ref="14" />
</strokeColor>
- <strokeWidth>
<double ref="15" />
</strokeWidth>
</a>
</transition>
- <transition id="1f">
- <points>


</points>
- <startConnector>
- <rConnector id="20">
- <Owner>
<decision ref="b" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="21">
- <Owner>
<task-node ref="7" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color ref="14" />
</strokeColor>
- <strokeWidth>
<double ref="15" />
</strokeWidth>
</a>
</transition>
- <transition id="22">
- <points>


</points>
- <startConnector>
- <rConnector id="23">
- <Owner>
<task-node ref="7" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="24">
- <Owner>
<task-node ref="9" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color ref="14" />
</strokeColor>
- <strokeWidth>
<double ref="15" />
</strokeWidth>
</a>
</transition>
- <transition id="25">
- <points>


</points>
- <startConnector>
- <rConnector id="26">
- <Owner>
<task-node ref="9" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="27">
- <Owner>
<task-node ref="f" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color ref="14" />
</strokeColor>
- <strokeWidth>
<double ref="15" />
</strokeWidth>
</a>
</transition>
- <transition id="28">
- <points>


</points>
- <startConnector>
- <rConnector id="29">
- <Owner>
<task-node ref="f" />
</Owner>
</rConnector>
</startConnector>
- <endConnector>
- <rConnector id="2a">
- <Owner>
<end-state ref="d" />
</Owner>
</rConnector>
</endConnector>
- <a>
- <strokeColor>
<color ref="14" />
</strokeColor>
- <strokeWidth>
<double ref="15" />
</strokeWidth>
</a>
</transition>
</figures>
</drawing>

修改成文一下形式的xml文件
<?xml version="1.0" encoding="UTF-8" ?>
- <process-definition xmlns="" name="document">
- <start-state name="开始">
<transition to="拟稿" />
</start-state>
- <task-node name="拟稿">
- <task name="拟稿">
<description>draft</description>
<assignment class="test.assignment.DraftAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
<transition to="审批" />
</task-node>
- <task-node name="归档">
- <task name="归档">
<description>file</description>
<assignment class="test.assignment.FileAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
<transition to="结束" />
</task-node>
- <task-node name="传阅">
- <task name="传阅">
<description>read</description>
<assignment class="test.assignment.ReadAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
<transition to="归档" />
</task-node>
- <task-node name="成文">
- <task name="成文">
<description>write</description>
<assignment class="test.assignment.WriteAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
<transition to="传阅" />
</task-node>
- <task-node name="审批">
- <task name="审批">
<description>examine</description>
<assignment class="test.assignment.ExamineAssignment" />
- <controller>
<variable access="read,write" name="documentId" />
</controller>
</task>
<transition to="判断" />
</task-node>
- <decision name="判断">
<handler class="test.handler.TestDecisionHandler" />
<transition to="成文" name="同意" />
<transition to="拟稿" name="不同意" />
</decision>
<end-state name="结束" />
</process-definition>

请问需要修改哪些文件啊？

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