com.netflix.archaius.interpolate.CommonsStrInterpolator Maven / Gradle / Ivy

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/**
 * Copyright 2015 Netflix, Inc.
 *
 * 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 com.netflix.archaius.interpolate;

import org.apache.commons.lang3.text.StrLookup;
import org.apache.commons.lang3.text.StrSubstitutor;

import com.netflix.archaius.api.StrInterpolator;

public final class CommonsStrInterpolator implements StrInterpolator {
    public static final CommonsStrInterpolator INSTANCE = new CommonsStrInterpolator();

    private CommonsStrInterpolator() {
    }
    
    @Override
    public Context create(final Lookup lookup) {
        final StrSubstitutor sub = new StrSubstitutor(
              new StrLookup() {
                  @Override
                  public String lookup(String key) {
                      return lookup.lookup(key);
                  }
              }, "${", "}", '$').setValueDelimiter(":");

        return new Context() {
            @Override
            public String resolve(String value) {
                return sub.replace(value);
            }
        };
    }
}