/*
 * Copyright 2002-2012 the original author or authors.
 *
 * 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 org.springframework.mock.env;

import java.util.Properties;

import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.core.env.PropertySource;

/**
 * Simple {@link PropertySource} implementation for use in testing. Accepts
 * a user-provided {@link Properties} object, or if omitted during construction,
 * the implementation will initialize its own.
 *
 * The {@link #setProperty} and {@link #withProperty} methods are exposed for
 * convenience, for example:
 * <pre class="code">
 * {@code
 *   PropertySource<?> source = new MockPropertySource().withProperty("foo", "bar");
 * }
 * </pre>
 *
 * @author Chris Beams
 * @since 3.1
 * @see org.springframework.mock.env.MockEnvironment
 */
public class MockPropertySource extends PropertiesPropertySource {

	/**
	 * {@value} is the default name for {@link MockPropertySource} instances not
	 * otherwise given an explicit name.
	 * @see #MockPropertySource()
	 * @see #MockPropertySource(String)
	 */
	public static final String MOCK_PROPERTIES_PROPERTY_SOURCE_NAME = "mockProperties";

	/**
	 * Create a new {@code MockPropertySource} named {@value #MOCK_PROPERTIES_PROPERTY_SOURCE_NAME}
	 * that will maintain its own internal {@link Properties} instance.
	 */
	public MockPropertySource() {
		this(new Properties());
	}

	/**
	 * Create a new {@code MockPropertySource} with the given name that will
	 * maintain its own internal {@link Properties} instance.
	 * @param name the {@linkplain #getName() name} of the property source
	 */
	public MockPropertySource(String name) {
		this(name, new Properties());
	}

	/**
	 * Create a new {@code MockPropertySource} named {@value #MOCK_PROPERTIES_PROPERTY_SOURCE_NAME}
	 * and backed by the given {@link Properties} object.
	 * @param properties the properties to use
	 */
	public MockPropertySource(Properties properties) {
		this(MOCK_PROPERTIES_PROPERTY_SOURCE_NAME, properties);
	}

	/**
	 * Create a new {@code MockPropertySource} with the given name and backed by the given
	 * {@link Properties} object.
	 * @param name the {@linkplain #getName() name} of the property source
	 * @param properties the properties to use
	 */
	public MockPropertySource(String name, Properties properties) {
		super(name, properties);
	}

	/**
	 * Set the given property on the underlying {@link Properties} object.
	 */
	public void setProperty(String name, Object value) {
		this.source.put(name, value);
	}

	/**
	 * Convenient synonym for {@link #setProperty} that returns the current instance.
	 * Useful for method chaining and fluent-style use.
	 * @return this {@link MockPropertySource} instance
	 */
	public MockPropertySource withProperty(String name, Object value) {
		this.setProperty(name, value);
		return this;
	}

}
