dubbo FixedParamValue 源码
dubbo FixedParamValue 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/url/component/param/FixedParamValue.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.dubbo.common.url.component.param;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
/**
* In lower case
*/
public class FixedParamValue implements ParamValue {
private final String[] values;
private final Map<String, Integer> val2Index;
public FixedParamValue(String... values) {
if (values.length == 0) {
throw new IllegalArgumentException("the array size of values should be larger than 0");
}
this.values = values;
Map<String, Integer> valueMap = new HashMap<>(values.length);
for (int i = 0; i < values.length; i++) {
if (values[i] != null) {
valueMap.put(values[i].toLowerCase(Locale.ROOT), i);
}
}
val2Index = Collections.unmodifiableMap(valueMap);
}
/**
* DEFAULT value will be returned if n = 0
* @param n
*/
@Override
public String getN(int n) {
return values[n];
}
@Override
public int getIndex(String value) {
Integer offset = val2Index.get(value.toLowerCase(Locale.ROOT));
if (offset == null) {
throw new IllegalArgumentException("unrecognized value " + value
+ " , please check if value is illegal. " +
"Permitted values: " + Arrays.asList(values));
}
return offset;
}
}
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