nz.net.ultraq.thymeleaf.fragments.mergers.VariableDeclaration Maven / Gradle / Ivy

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/* 
 * Copyright 2016, Emanuel Rabina (http://www.ultraq.net.nz/)
 * 
 * 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 nz.net.ultraq.thymeleaf.fragments.mergers;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Representation of a scoped variable declaration made through
 * th:with attributes.
 *
 * @author Emanuel Rabina
 */
public class VariableDeclaration {

    private static final Pattern DECLARATION_PATTERN = Pattern.compile("(.*?)=(.*)");

    private final String name;
    private final String value;

    /**
     * Constructor, create an instance from the declaration string.
     *
     * @param declaration
     */
    public VariableDeclaration(String declaration) {

        Matcher matcher = DECLARATION_PATTERN.matcher(declaration);
        if (matcher.matches()) {
            name = matcher.group(1);
            value = matcher.group(2);
        } else {
            throw new IllegalArgumentException("Unable to derive attribte declaration from string " + declaration);
        }
    }

    /**
     * Reconstructs the variable for use with th:with.
     *
     * @return {name}=${value}
     */
    @Override
    public String toString() {
        return name + "=" + value;
    }

    public String getName() {
        return name;
    }

    public String getValue() {
        return value;
    }

}