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| ValueHolder (Cayenne Documentation 3.0.2 API) |
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| SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD> |
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| DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD> |
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| <H2> |
| <FONT SIZE="-1"> |
| org.apache.cayenne</FONT> |
| <BR> |
| Interface ValueHolder</H2> |
| <DL> |
| <DT><B>All Superinterfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A></DD> |
| </DL> |
| <DL> |
| <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../org/apache/cayenne/util/IndexPropertyList.html" title="class in org.apache.cayenne.util">IndexPropertyList</A>, <A HREF="../../../org/apache/cayenne/util/PersistentObjectHolder.html" title="class in org.apache.cayenne.util">PersistentObjectHolder</A>, <A HREF="../../../org/apache/cayenne/util/PersistentObjectList.html" title="class in org.apache.cayenne.util">PersistentObjectList</A>, <A HREF="../../../org/apache/cayenne/util/PersistentObjectMap.html" title="class in org.apache.cayenne.util">PersistentObjectMap</A>, <A HREF="../../../org/apache/cayenne/util/PersistentObjectSet.html" title="class in org.apache.cayenne.util">PersistentObjectSet</A>, <A HREF="../../../org/apache/cayenne/access/ToManyList.html" title="class in org.apache.cayenne.access">ToManyList</A></DD> |
| </DL> |
| <HR> |
| <DL> |
| <DT><PRE>public interface <B>ValueHolder</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A></DL> |
| </PRE> |
| |
| <P> |
| Provides a level of indirection for property value access, most often used for deferred |
| faulting of to-one relationships. A ValueHolder abstracts how a property value is |
| obtained (fetched from DB, etc.), thus simplifying design of an object that uses it. |
| <p> |
| Here is an example of a bean property implemented using ValueHolder: |
| </p> |
| |
| <pre> |
| protected ValueHolder someProperty; |
| |
| public SomeClass getSomeProperty() { |
| return (SomeClass) somePropertyHolder.getValue(SomeClass.class); |
| } |
| |
| public void setSomeProperty(SomeClass newValue) { |
| somePropertyHolder.setValue(SomeClass.class, newValue); |
| } |
| </pre> |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Since:</B></DT> |
| <DD>1.2</DD> |
| </DL> |
| <HR> |
| |
| <P> |
| |
| <!-- ========== METHOD SUMMARY =========== --> |
| |
| <A NAME="method_summary"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
| <B>Method Summary</B></FONT></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/cayenne/ValueHolder.html#getValue()">getValue</A></B>()</CODE> |
| |
| <BR> |
| Returns an object stored by this ValueHolder.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/cayenne/ValueHolder.html#getValueDirectly()">getValueDirectly</A></B>()</CODE> |
| |
| <BR> |
| Retrieves ValueHolder value without triggering fault resolution.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/cayenne/ValueHolder.html#invalidate()">invalidate</A></B>()</CODE> |
| |
| <BR> |
| Turns a ValueHolder into a fault.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/cayenne/ValueHolder.html#isFault()">isFault</A></B>()</CODE> |
| |
| <BR> |
| Returns true if the internal value is not yet resolved.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/cayenne/ValueHolder.html#setValue(java.lang.Object)">setValue</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> value)</CODE> |
| |
| <BR> |
| Sets an object stored by this ValueHolder.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/cayenne/ValueHolder.html#setValueDirectly(java.lang.Object)">setValueDirectly</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> value)</CODE> |
| |
| <BR> |
| Sets ValueHolder vaue without triggering fault resolution.</TD> |
| </TR> |
| </TABLE> |
| |
| <P> |
| |
| <!-- ============ METHOD DETAIL ========== --> |
| |
| <A NAME="method_detail"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
| <B>Method Detail</B></FONT></TH> |
| </TR> |
| </TABLE> |
| |
| <A NAME="getValue()"><!-- --></A><H3> |
| getValue</H3> |
| <PRE> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>getValue</B>() |
| throws <A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></PRE> |
| <DL> |
| <DD>Returns an object stored by this ValueHolder. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></CODE></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getValueDirectly()"><!-- --></A><H3> |
| getValueDirectly</H3> |
| <PRE> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>getValueDirectly</B>() |
| throws <A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></PRE> |
| <DL> |
| <DD>Retrieves ValueHolder value without triggering fault resolution. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></CODE></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setValue(java.lang.Object)"><!-- --></A><H3> |
| setValue</H3> |
| <PRE> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>setValue</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> value) |
| throws <A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></PRE> |
| <DL> |
| <DD>Sets an object stored by this ValueHolder. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>value</CODE> - a new value of the ValueHolder. |
| <DT><B>Returns:</B><DD>a previous value saved in the ValueHolder. |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></CODE></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setValueDirectly(java.lang.Object)"><!-- --></A><H3> |
| setValueDirectly</H3> |
| <PRE> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>setValueDirectly</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> value) |
| throws <A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></PRE> |
| <DL> |
| <DD>Sets ValueHolder vaue without triggering fault resolution. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../../org/apache/cayenne/CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</A></CODE></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="isFault()"><!-- --></A><H3> |
| isFault</H3> |
| <PRE> |
| boolean <B>isFault</B>()</PRE> |
| <DL> |
| <DD>Returns true if the internal value is not yet resolved. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="invalidate()"><!-- --></A><H3> |
| invalidate</H3> |
| <PRE> |
| void <B>invalidate</B>()</PRE> |
| <DL> |
| <DD>Turns a ValueHolder into a fault. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
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