001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.commons.beanutils2.converters;
020
021import java.util.regex.Pattern;
022
023/**
024 * {@link org.apache.commons.beanutils2.Converter} implementation that handles conversion to and from {@link Pattern}.
025 *
026 * @since 2.0.0
027 */
028public class PatternConverter extends AbstractConverter<Pattern> {
029
030    /**
031     * Construct a <strong>{@link Pattern}</strong> <em>Converter</em> that throws a {@code ConversionException} if an error occurs.
032     */
033    public PatternConverter() {
034    }
035
036    /**
037     * Constructs a {@link org.apache.commons.beanutils2.Converter} that will return the specified default value if a conversion error occurs.
038     *
039     * @param defaultValue The default value to be returned if the value to be converted is missing or an error occurs converting the value.
040     */
041    public PatternConverter(final Pattern defaultValue) {
042        super(defaultValue);
043    }
044
045    /**
046     * Converts the specified input object into an output object of the specified type.
047     *
048     * @param type  Data type to which this value should be converted.
049     * @param value The String property value to convert.
050     * @return A {@link Pattern} which represents the compiled configuration property.
051     * @throws NullPointerException                   If the value is null.
052     * @throws java.util.regex.PatternSyntaxException If the regular expression {@link String} provided is malformed.
053     */
054    @Override
055    protected <T> T convertToType(final Class<T> type, final Object value) throws Throwable {
056        if (Pattern.class.isAssignableFrom(type)) {
057            final String stringValue = toString(value);
058            return type.cast(Pattern.compile(stringValue));
059        }
060
061        throw conversionException(type, value);
062    }
063
064    /**
065     * Gets the default type this {@code Converter} handles.
066     *
067     * @return The default type this {@code Converter} handles.
068     * @since 2.0.0
069     */
070    @Override
071    protected Class<Pattern> getDefaultType() {
072        return Pattern.class;
073    }
074}