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Apache Commons BeanUtils provides an easy-to-use but flexible wrapper around reflection and introspection.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
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package org.apache.commons.beanutils2;

import java.lang.reflect.InvocationTargetException;
import java.util.function.Predicate;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 

Predicate implementation that applies the given {@code Predicate} * to the result of calling the given property getter. *

* * @param the type of the input to the predicate */ public class BeanPredicate implements Predicate { private final Log log = LogFactory.getLog(this.getClass()); /** Name of the property whose value will be predicated */ private String propertyName; /** {@code Predicate} to be applied to the property value */ private Predicate predicate; /** * Constructs a {@code BeanPredicate} that applies the given * {@code Predicate} to the named property value. * @param propertyName the name of the property whose value is to be predicated, * not null * @param predicate the {@code Predicate} to be applied, * not null */ public BeanPredicate(final String propertyName, final Predicate predicate) { this.propertyName = propertyName; this.predicate = predicate; } /** * Evaluates the given object by applying the {@link #getPredicate()} * to a property value named by {@link #getPropertyName()}. * * @param object The object to test * @return the result of the predicate evaluation * @throws IllegalArgumentException when the property cannot be evaluated */ @Override public boolean test(final Object object) { boolean evaluation = false; try { final T propValue = (T) PropertyUtils.getProperty(object, propertyName); evaluation = predicate.test(propValue); } catch (final IllegalArgumentException e) { final String errorMsg = "Problem during evaluation."; log.error(errorMsg, e); throw e; } catch (final IllegalAccessException e) { final String errorMsg = "Unable to access the property provided."; log.error(errorMsg, e); throw new IllegalArgumentException(errorMsg); } catch (final InvocationTargetException e) { final String errorMsg = "Exception occurred in property's getter"; log.error(errorMsg, e); throw new IllegalArgumentException(errorMsg); } catch (final NoSuchMethodException e) { final String errorMsg = "Property not found."; log.error(errorMsg, e); throw new IllegalArgumentException(errorMsg); } return evaluation; } /** * Gets the name of the property whose value is to be predicated. * in the evaluation. * @return the property name, not null */ public String getPropertyName() { return propertyName; } /** * Sets the name of the property whose value is to be predicated. * @param propertyName the name of the property whose value is to be predicated, * not null */ public void setPropertyName(final String propertyName) { this.propertyName = propertyName; } /** * Gets the {@code Predicate} to be applied to the value of the named property * during {@link #test(Object)}. * @return {@code Predicate}, not null */ public Predicate getPredicate() { return predicate; } /** * Sets the {@code Predicate} to be applied to the value of the named property * during {@link #test(Object)}. * @param predicate {@code Predicate}, not null */ public void setPredicate(final Predicate predicate) { this.predicate = predicate; } }




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