net.cnmconsulting.spring.config.PropertiesFactoryBean.java Source code

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Here is the source code for net.cnmconsulting.spring.config.PropertiesFactoryBean.java

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/*
 * =============================================================================
 * 
 *   Copyright (c) 2007-2011, The CNM Consulting (http://cnmconsulting.net) and
 *   chrislovecnm (http://chrislovecnm.com)
 * 
 *   Licensed 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
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 * =============================================================================
 */
package net.cnmconsulting.spring.config;

import java.io.IOException;
import java.util.Map;
import java.util.Properties;

import org.jasypt.encryption.StringEncryptor;
import org.jasypt.properties.PropertyValueEncryptionUtils;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.support.PropertiesLoaderSupport;
import org.springframework.util.Assert;

/**
 * This code is based off of
 * {@link org.springframework.beans.factory.config.PropertiesFactoryBean}. It
 * also decrypts encoded passwords. Allows for making a properties file from a
 * classpath location available as Properties instance in a bean factory. Can be
 * used to populate any bean property of type Properties via a bean reference.
 * 
 * <p>
 * Supports loading from a properties file and/or setting local properties on
 * this FactoryBean. The created Properties instance will be merged from loaded
 * and local values. If neither a location nor local properties are set, an
 * exception will be thrown on initialization.
 * 
 * <p>
 * Can create a singleton or a new object on each request. Default is a
 * singleton.
 * 
 * @author Chris Love
 * @see #setLocation
 * @see #setProperties
 * @see #setLocalOverride
 * @see java.util.Properties
 */
public class PropertiesFactoryBean extends PropertiesLoaderSupport
        implements FactoryBean<Properties>, InitializingBean {

    private boolean singleton = true;

    private Properties singletonInstance;

    private final StringEncryptor stringEncryptor;

    public PropertiesFactoryBean(final StringEncryptor stringEncryptor) {
        super();
        Assert.notNull(stringEncryptor, "encryptor cannot be null");
        this.stringEncryptor = stringEncryptor;
    }

    /**
     * Set whether a shared 'singleton' Properties instance should be created,
     * or rather a new Properties instance on each request.
     * <p>
     * Default is "true" (a shared singleton).
     */
    public final void setSingleton(boolean singleton) {
        this.singleton = singleton;
    }

    public final boolean isSingleton() {
        return this.singleton;
    }

    public final void afterPropertiesSet() throws IOException {
        if (this.singleton) {
            this.singletonInstance = createProperties();
        }
    }

    public final Properties getObject() throws IOException {
        if (this.singleton) {
            return this.singletonInstance;
        } else {
            return createProperties();
        }
    }

    public Class<Properties> getObjectType() {
        return Properties.class;
    }

    /**
     * Template method that subclasses may override to construct the object
     * returned by this factory. The default implementation returns the plain
     * merged Properties instance.
     * <p>
     * Invoked on initialization of this FactoryBean in case of a shared
     * singleton; else, on each {@link #getObject()} call.
     * 
     * @return the object returned by this factory
     * @throws IOException
     *             if an exception occured during properties loading
     * @see #mergeProperties()
     */
    protected Properties createProperties() throws IOException {
        return (Properties) createInstance();
    }

    /**
     * This method scans for property values that are marked as encrypted
     * and decryptes those values.
     * 
     * Template method that subclasses may override to construct the object
     * returned by this factory. The default implementation returns the plain
     * merged Properties instance.
     * <p>
     * Invoked on initialization of this FactoryBean in case of a shared
     * singleton; else, on each {@link #getObject()} call.
     * 
     * @return the object returned by this factory
     * @throws IOException
     *             if an exception occured during properties loading
     * @deprecated as of Spring 3.0, in favor of {@link #createProperties()}
     */
    @Deprecated
    protected Object createInstance() throws IOException {
        Properties props = mergeProperties();
        for (Map.Entry<Object, Object> entry : props.entrySet()) {

            if ((entry.getValue() instanceof String)) {

                String value = (String) entry.getValue();
                if (PropertyValueEncryptionUtils.isEncryptedValue(value)) {
                    String decrypted = PropertyValueEncryptionUtils.decrypt(value, this.stringEncryptor);
                    props.put(entry.getKey(), decrypted);
                }
            }
        }

        return props;

    }

}