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/*
* Copyright 2016, Google 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.google.instrumentation.stats;
/**
* Tag values.
*
* <p>TagValue's are {@link String}s with enforced restrictions.
*/
public final class TagValue {
public static final int MAX_LENGTH = StringUtil.MAX_LENGTH;
/**
* Constructs a new {@link TagValue} from the given string. The string will be sanitize such that:
* <ol>
* <li>length is restricted to {@link MAX_LENGTH}, strings longer than that will be truncated.
* <li>characters are restricted to printable ascii characters, non-printable characters will be
* replaced by an underscore '_'.
* </ol>
*/
public static TagValue create(String value) {
return new TagValue(value);
}
@Override
public boolean equals(Object obj) {
return (obj instanceof TagValue) && value.equals(((TagValue) obj).value);
}
@Override
public int hashCode() {
return value.hashCode();
}
@Override
public String toString() {
return value;
}
private final String value;
private TagValue(String value) {
this.value = StringUtil.sanitize(value);
}
}
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