org.atteo.dollarbrace.OneOfPropertyResolver.java Source code

Introduction

Here is the source code for org.atteo.dollarbrace.OneOfPropertyResolver.java

Source

/*
 * Copyright 2012 Atteo.
 *
 * 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.atteo.dollarbrace;

import java.util.List;

import org.atteo.dollarbrace.spi.Tokenizer;

import com.google.common.base.Splitter;

public class OneOfPropertyResolver implements PrefixedPropertyResolver {
    private static final String prefix = "oneof:";

    @Override
    public String getPrefix() {
        return prefix;
    }

    @Override
    public String resolveProperty(String name, PropertyFilter resolver) throws PropertyNotFoundException {
        if (!name.startsWith(prefix)) {
            return null;
        }
        name = name.substring(prefix.length());
        List<Tokenizer.Token> tokens = Tokenizer.splitIntoTokens(name);

        StringBuilder result = new StringBuilder();
        boolean skip = false;

        for (Tokenizer.Token token : tokens) {
            if (token.isProperty()) {
                if (!skip) {
                    try {
                        result.append(resolver.getProperty(token.getValue()));
                    } catch (PropertyNotFoundException e) {
                        skip = true;
                    }
                }
            } else {
                boolean first = true;
                for (String p : Splitter.on(',').split(token.getValue())) {
                    if (!first) {
                        if (!skip) {
                            return result.toString();
                        } else {
                            result = new StringBuilder();
                            skip = false;
                        }
                    }
                    if (!skip) {
                        result.append(p);
                    }
                    first = false;
                }
            }
        }
        if (skip) {
            throw new PropertyNotFoundException(name);
        }

        return result.toString();
    }
}