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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.android.sched.util.codec;
import com.android.sched.util.config.ChainedException.ChainedExceptionBuilder;
import com.android.sched.util.config.ConfigurationError;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
/**
* This {@link StringCodec} is used to create an instance of {@link Entry}
*/
// STOPSHIP see https://android-review.googlesource.com/#/c/120553/17
public class PairCodec<T, U> implements StringCodec<Entry<T, U>>{
@Nonnull
private final StringCodec<T> keyParser;
@Nonnull
private final StringCodec<U> valueParser;
@Nonnull
private String separator = "=";
public PairCodec(@Nonnull StringCodec<T> keyParser, @Nonnull StringCodec<U> valueParser) {
this.keyParser = keyParser;
this.valueParser = valueParser;
}
@Nonnull
public PairCodec<T, U> on(@Nonnull String separator) {
this.separator = separator;
return this;
}
@Nonnull
public String getSeparator() {
return separator;
}
@Override
@Nonnull
public Entry<T, U> parseString(@Nonnull CodecContext context,
@Nonnull String string) {
int endKey = string.indexOf(separator);
if (endKey == -1) {
throw new ConfigurationError("Missing '"
+ separator + "' in '" + string + "'");
}
String key = string.substring(0, endKey);
String valueString = string.substring(endKey + separator.length());
return new AbstractMap.SimpleEntry<T, U>(keyParser.parseString(context, key),
valueParser.parseString(context, valueString));
}
@Override
@CheckForNull
public Entry<T, U> checkString(@Nonnull CodecContext context,
@Nonnull String string)
throws ParsingException {
ChainedExceptionBuilder<ParsingException> exceptions =
new ChainedExceptionBuilder<ParsingException>();
T keyElement = null;
U valueElement = null;
int endKey = string.indexOf(separator);
if (endKey == -1) {
exceptions.appendException(new ParsingException("Missing '"
+ separator + "' in '" + string + "'"));
} else {
String key = string.substring(0, endKey);
String valueString = string.substring(endKey + separator.length());
try {
keyElement = keyParser.checkString(context, key);
} catch (ParsingException e) {
exceptions.appendException(e);
}
try {
valueElement = valueParser.checkString(context, valueString);
} catch (ParsingException e) {
exceptions.appendException(e);
}
}
exceptions.throwIfNecessary();
// If one element is null, do not compute the pair
if (keyElement == null || valueElement == null) {
return null;
} else {
return new AbstractMap.SimpleEntry<T, U>(keyElement, valueElement);
}
}
@Override
@Nonnull
public String getUsage() {
StringBuilder sb = new StringBuilder();
sb.append("<key>" + separator + "<value>");
sb.append(" where <key> is ");
sb.append(keyParser.getUsage());
sb.append(" and where <value> is ");
sb.append(valueParser.getUsage());
return sb.toString();
}
@Override
@Nonnull
public List<com.android.sched.util.codec.Parser.ValueDescription> getValueDescriptions() {
List<com.android.sched.util.codec.Parser.ValueDescription> list =
new ArrayList<Parser.ValueDescription>();
list.addAll(keyParser.getValueDescriptions());
list.addAll(valueParser.getValueDescriptions());
return list;
}
@Override
@Nonnull
public String formatValue(@Nonnull Entry<T, U> data) {
StringBuilder sb = new StringBuilder();
sb.append(keyParser.formatValue(data.getKey()));
sb.append(separator);
sb.append(valueParser.formatValue(data.getValue()));
return sb.toString();
}
@Override
public void checkValue(@Nonnull CodecContext context, @Nonnull Entry<T, U> data)
throws CheckingException {
ChainedExceptionBuilder<CheckingException> exceptions =
new ChainedExceptionBuilder<CheckingException>();
try {
keyParser.checkValue(context, data.getKey());
} catch (CheckingException e) {
exceptions.appendException(e);
}
try {
valueParser.checkValue(context, data.getValue());
} catch (CheckingException e) {
exceptions.appendException(e);
}
exceptions.throwIfNecessary();
}
}
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