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Grails Web Application Framework
There is a newer version: 6.2.0
/*
 * Copyright 2014 original 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.grails.config;

import grails.config.Config;
import grails.util.GrailsStringUtils;
import groovy.transform.CompileStatic;
import org.grails.core.exceptions.GrailsConfigurationException;
import org.springframework.util.ClassUtils;

import java.util.*;


/**
 * A {@link Config} composed of other Configs
 *
 * @author Graeme Rocher
 * @since 3.0
 */
@CompileStatic
public class CompositeConfig implements Config {

    protected Deque configs = new ArrayDeque();

    /**
     * Adds a config at the highest level of precedence
     *
     * @param config
     */
    public void addFirst(Config config) {
        configs.addFirst(config);
    }

    /**
     * Adds a config at the lowest level of precedence
     *
     * @param config
     */
    public void addLast(Config config) {
        configs.addLast(config);
    }

    @Override
    @Deprecated
    public Map flatten() {
        Map flattened = new LinkedHashMap();
        for(Config c : configs) {
            flattened.putAll(c.flatten());
        }
        return flattened;
    }

    @Override
    public Properties toProperties() {
        Properties properties = new Properties();
        for(Config c : configs) {
            properties.putAll(c.toProperties());
        }
        return properties;
    }

    @Override
    public Config merge(Map toMerge) {
        throw new UnsupportedOperationException("Config cannot be modified");
    }

    @Override
    public  T getProperty(String key, Class targetType, T defaultValue, List allowedValues) {
        T v = getProperty(key, targetType, defaultValue);
        if(!allowedValues.contains(v)) {
            throw new GrailsConfigurationException("Invalid configuration value [$value] for key [${key}]. Possible values $allowedValues");
        }
        return v;
    }

    @Override
    public Object getAt(Object key) {
        for(Config c : configs) {
            Object v = c.getAt(key);
            if(v != null) return v;
        }
        return null;
    }

    @Override
    public void setAt(Object key, Object value) {
        throw new UnsupportedOperationException("Config cannot be modified");
    }

    @Override
    public Object navigate(String... path) {
        for(Config c : configs) {
            Object v = c.navigate(path);
            if(v != null) return v;
        }
        return null;
    }


    @Override
    public int size() {
        int size = 0;
        for (Config config : configs) {
            size += config.size();
        }
        return size;
    }

    @Override
    public boolean isEmpty() {
        for (Config config : configs) {
            if(!config.isEmpty()) {
                return false;
            }
        }
        return true;
    }

    @Override
    public boolean containsKey(Object key) {
        for (Config config : configs) {
            if(config.containsKey(key)) return true;
        }
        return false;
    }

    @Override
    public boolean containsValue(Object value) {
        for (Config config : configs) {
            if(config.containsValue(value)) return true;
        }
        return false;
    }

    @Override
    public Object get(Object key) {
        for (Config config : configs) {
            Object v = config.get(key);
            if(v != null) return v;
        }
        return null;
    }

    @Override
    public Object put(String key, Object value) {
        throw new UnsupportedOperationException("Config cannot be modified");
    }

    @Override
    public Object remove(Object key) {
        throw new UnsupportedOperationException("Config cannot be modified");
    }

    @Override
    public void putAll(Map m) {
        throw new UnsupportedOperationException("Config cannot be modified");
    }

    @Override
    public void clear() {
        throw new UnsupportedOperationException("Config cannot be modified");
    }

    @Override
    public Iterator> iterator() {
        return entrySet().iterator();
    }

    @Override
    public Set keySet() {
        Set entries = new HashSet();
        for (Config config : configs) {
            entries.addAll(config.keySet());
        }
        return entries;
    }

    @Override
    public Collection