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<div class="subTitle">org.apache.commons.beanutils</div>
<h2 title="Class BeanComparator" class="title">Class BeanComparator<T></h2>
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<li><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li>org.apache.commons.beanutils.BeanComparator<T></li>
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<div class="description">
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<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the type of beans to be compared by this <code>Comparator</code></dd>
</dl>
<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><T></dd>
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<pre>public class <span class="typeNameLabel">BeanComparator<T></span>
extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><T>, <a href="http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
<div class="block"><p>
This comparator compares two beans by the specified bean property.
It is also possible to compare beans based on nested, indexed,
combined, mapped bean properties. Please see the <a href="../../../../org/apache/commons/beanutils/PropertyUtilsBean.html" title="class in org.apache.commons.beanutils"><code>PropertyUtilsBean</code></a>
documentation for all property name possibilities.
</p><p>
<strong>Note:</strong> The BeanComparator passes the values of the specified
bean property to a ComparableComparator, if no comparator is
specified in the constructor. If you are comparing two beans based
on a property that could contain "null" values, a suitable <code>Comparator</code>
or <code>ComparatorChain</code> should be supplied in the constructor.
Note that the passed in <code>Comparator</code> must be able to handle the
passed in objects. Because the type of the property to be compared is not
known at compile time no type checks can be performed by the compiler.
Thus <code>ClassCastException</code> exceptions can be thrown if unexpected
property values occur.
</p></div>
<dl>
<dt><span class="simpleTagLabel">Version:</span></dt>
<dd>$Id: BeanComparator.java 1632171 2014-10-15 20:15:17Z ggregory $</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../serialized-form.html#org.apache.commons.beanutils.BeanComparator">Serialized Form</a></dd>
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<h3>Constructor Summary</h3>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#BeanComparator--">BeanComparator</a></span>()</code>
<div class="block">Constructs a Bean Comparator without a property set.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#BeanComparator-java.lang.String-">BeanComparator</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> property)</code>
<div class="block">Constructs a property-based comparator for beans.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#BeanComparator-java.lang.String-java.util.Comparator-">BeanComparator</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> property,
<a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><?> comparator)</code>
<div class="block">Constructs a property-based comparator for beans.</div>
</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#compare-T-T-">compare</a></span>(<a href="../../../../org/apache/commons/beanutils/BeanComparator.html" title="type parameter in BeanComparator">T</a> o1,
<a href="../../../../org/apache/commons/beanutils/BeanComparator.html" title="type parameter in BeanComparator">T</a> o2)</code>
<div class="block">Compare two JavaBeans by their shared property.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#equals-java.lang.Object-">equals</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> o)</code>
<div class="block">Two <code>BeanComparator</code>'s are equals if and only if
the wrapped comparators and the property names to be compared
are equal.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><?></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#getComparator--">getComparator</a></span>()</code>
<div class="block">Gets the Comparator being used to compare beans.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#getProperty--">getProperty</a></span>()</code>
<div class="block">Gets the property attribute of the BeanComparator</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#hashCode--">hashCode</a></span>()</code>
<div class="block">Hashcode compatible with equals.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/beanutils/BeanComparator.html#setProperty-java.lang.String-">setProperty</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> property)</code>
<div class="block">Sets the method to be called to compare two JavaBeans</div>
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<h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Methods inherited from interface java.util.<a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a></h3>
<code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#comparing-java.util.function.Function-" title="class or interface in java.util">comparing</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#comparing-java.util.function.Function-java.util.Comparator-" title="class or interface in java.util">comparing</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#comparingDouble-java.util.function.ToDoubleFunction-" title="class or interface in java.util">comparingDouble</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#comparingInt-java.util.function.ToIntFunction-" title="class or interface in java.util">comparingInt</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#comparingLong-java.util.function.ToLongFunction-" title="class or interface in java.util">comparingLong</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#naturalOrder--" title="class or interface in java.util">naturalOrder</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#nullsFirst-java.util.Comparator-" title="class or interface in java.util">nullsFirst</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#nullsLast-java.util.Comparator-" title="class or interface in java.util">nullsLast</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#reversed--" title="class or interface in java.util">reversed</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#reverseOrder--" title="class or interface in java.util">reverseOrder</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.Comparator-" title="class or interface in java.util">thenComparing</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.function.Function-" title="class or interface in java.util">thenComparing</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.function.Function-java.util.Comparator-" title="class or interface in java.util">thenComparing</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#thenComparingDouble-java.util.function.ToDoubleFunction-" title="class or interface in java.util">thenComparingDouble</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#thenComparingInt-java.util.function.ToIntFunction-" title="class or interface in java.util">thenComparingInt</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#thenComparingLong-java.util.function.ToLongFunction-" title="class or interface in java.util">thenComparingLong</a></code></li>
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<h4>BeanComparator</h4>
<pre>public BeanComparator()</pre>
<div class="block"><p>Constructs a Bean Comparator without a property set.
</p><p>
<strong>Note</strong> that this is intended to be used
only in bean-centric environments.
</p><p>
Until <a href="../../../../org/apache/commons/beanutils/BeanComparator.html#setProperty-java.lang.String-"><code>setProperty(java.lang.String)</code></a> is called with a non-null value.
this comparator will compare the Objects only.
</p></div>
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<h4>BeanComparator</h4>
<pre>public BeanComparator(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> property)</pre>
<div class="block"><p>Constructs a property-based comparator for beans.
This compares two beans by the property
specified in the property parameter. This constructor creates
a <code>BeanComparator</code> that uses a <code>ComparableComparator</code>
to compare the property values.
</p>
<p>Passing "null" to this constructor will cause the BeanComparator
to compare objects based on natural order, that is
<code>java.lang.Comparable</code>.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>property</code> - String Name of a bean property, which may contain the
name of a simple, nested, indexed, mapped, or combined
property. See <a href="../../../../org/apache/commons/beanutils/PropertyUtilsBean.html" title="class in org.apache.commons.beanutils"><code>PropertyUtilsBean</code></a> for property query language syntax.
If the property passed in is null then the actual objects will be compared</dd>
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<h4>BeanComparator</h4>
<pre>public BeanComparator(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> property,
<a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><?> comparator)</pre>
<div class="block">Constructs a property-based comparator for beans.
This constructor creates
a BeanComparator that uses the supplied Comparator to compare
the property values.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>property</code> - Name of a bean property, can contain the name
of a simple, nested, indexed, mapped, or combined
property. See <a href="../../../../org/apache/commons/beanutils/PropertyUtilsBean.html" title="class in org.apache.commons.beanutils"><code>PropertyUtilsBean</code></a> for property query language
syntax.</dd>
<dd><code>comparator</code> - BeanComparator will pass the values of the
specified bean property to this Comparator.
If your bean property is not a comparable or
contains null values, a suitable comparator
may be supplied in this constructor.</dd>
</dl>
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<h4>setProperty</h4>
<pre>public void setProperty(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> property)</pre>
<div class="block">Sets the method to be called to compare two JavaBeans</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>property</code> - String method name to call to compare
If the property passed in is null then the actual objects will be compared</dd>
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<pre>public <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> getProperty()</pre>
<div class="block">Gets the property attribute of the BeanComparator</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>String method name to call to compare.
A null value indicates that the actual objects will be compared</dd>
</dl>
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<pre>public <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><?> getComparator()</pre>
<div class="block">Gets the Comparator being used to compare beans.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the Comparator being used to compare beans</dd>
</dl>
</li>
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<h4>compare</h4>
<pre>public int compare(<a href="../../../../org/apache/commons/beanutils/BeanComparator.html" title="type parameter in BeanComparator">T</a> o1,
<a href="../../../../org/apache/commons/beanutils/BeanComparator.html" title="type parameter in BeanComparator">T</a> o2)</pre>
<div class="block">Compare two JavaBeans by their shared property.
If <a href="../../../../org/apache/commons/beanutils/BeanComparator.html#getProperty--"><code>getProperty()</code></a> is null then the actual objects will be compared.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#compare-T-T-" title="class or interface in java.util">compare</a></code> in interface <code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><<a href="../../../../org/apache/commons/beanutils/BeanComparator.html" title="type parameter in BeanComparator">T</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>o1</code> - Object The first bean to get data from to compare against</dd>
<dd><code>o2</code> - Object The second bean to get data from to compare</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>int negative or positive based on order</dd>
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<h4>equals</h4>
<pre>public boolean equals(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> o)</pre>
<div class="block">Two <code>BeanComparator</code>'s are equals if and only if
the wrapped comparators and the property names to be compared
are equal.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.util">equals</a></code> in interface <code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><<a href="../../../../org/apache/commons/beanutils/BeanComparator.html" title="type parameter in BeanComparator">T</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a></code> in class <code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>o</code> - Comparator to compare to</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the the comparators are equal or not</dd>
</dl>
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<h4>hashCode</h4>
<pre>public int hashCode()</pre>
<div class="block">Hashcode compatible with equals.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a></code> in class <code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the hash code for this comparator</dd>
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