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/*
* Copyright (C) 2013 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.config.id;
import com.android.sched.util.codec.ListCodec;
import com.android.sched.util.codec.StringCodec;
import com.android.sched.util.config.ConfigChecker;
import com.android.sched.util.config.MissingPropertyException;
import com.android.sched.util.config.PropertyIdException;
import com.android.sched.util.config.expression.BooleanExpression;
import com.android.sched.util.config.expression.LongExpression;
import java.util.List;
import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
/**
* Specialized {@link PropertyId} that manages properties of type {@link List}
*
* @param <T> the type of elements in this list
*/
public class ListPropertyId<T> extends PropertyId<List<T>> {
@Nonnull
public static <T> ListPropertyId<T> create(@Nonnull String name, @Nonnull String description,
@Nonnull String var, @Nonnull StringCodec<T> parser) {
return new ListPropertyId<T>(name, description, new ListCodec<T>(var, parser));
}
protected ListPropertyId(
@Nonnull String name, @Nonnull String description, @Nonnull ListCodec<T> parser) {
super(name, description, parser);
}
@Override
@Nonnull
public ListPropertyId<T> addDefaultValue (@Nonnull String defaultValue) {
super.addDefaultValue(defaultValue);
return this;
}
@Override
@Nonnull
public ListPropertyId<T> addDefaultValue (@Nonnull List<T> defaultValue) {
super.addDefaultValue(defaultValue);
return this;
}
@Override
@Nonnull
public ListPropertyId<T> requiredIf(@Nonnull BooleanExpression expression) {
super.requiredIf(expression);
return this;
}
@Override
@Nonnull
public ListCodec<T> getCodec() {
return (ListCodec<T>) super.getCodec();
}
@Nonnull
public ListPropertyId<T> on(@Nonnull String separator) {
getCodec().setSeperator(separator);
return this;
}
@Nonnull
public ListPropertyId<T> minElements(@Nonnegative int min) {
getCodec().setMin(min);
return this;
}
@Nonnull
public ListPropertyId<T> maxElements(@Nonnegative int max) {
getCodec().setMax(max);
return this;
}
@Nonnull
public BooleanExpression isEmpty() {
return new BooleanExpression() {
@Override
public boolean eval(@Nonnull ConfigChecker checker)
throws PropertyIdException, MissingPropertyException {
if (!isRequired(checker)) {
throw new MissingPropertyException(ListPropertyId.this);
}
return checker.parse(ListPropertyId.this).isEmpty();
}
@Override
@Nonnull
public String getDescription() {
return format(formatPropertyName(ListPropertyId.this), true);
}
@Override
@Nonnull
public String getCause(@Nonnull ConfigChecker checker) throws PropertyIdException {
try {
return format(formatPropertyName(checker, ListPropertyId.this), eval(checker));
} catch (MissingPropertyException e) {
return e.getMessage();
}
}
};
}
@Nonnull
public BooleanExpression isNotEmpty() {
return new BooleanExpression() {
@Override
public boolean eval(@Nonnull ConfigChecker checker)
throws PropertyIdException, MissingPropertyException {
if (!isRequired(checker)) {
throw new MissingPropertyException(ListPropertyId.this);
}
return !checker.parse(ListPropertyId.this).isEmpty();
}
@Override
@Nonnull
public String getDescription() {
return format(formatPropertyName(ListPropertyId.this), false);
}
@Override
@Nonnull
public String getCause(@Nonnull ConfigChecker checker) throws PropertyIdException {
try {
return format(formatPropertyName(checker, ListPropertyId.this), !eval(checker));
} catch (MissingPropertyException e) {
return e.getMessage();
}
}
};
}
@Nonnull
public LongExpression getSize() {
return new LongExpression() {
@Override
public long eval(@Nonnull ConfigChecker checker)
throws PropertyIdException, MissingPropertyException {
if (!isRequired(checker)) {
throw new MissingPropertyException(ListPropertyId.this);
}
return checker.parse(ListPropertyId.this).size();
}
@Override
@Nonnull
public String getDescription() {
return "number of elements of " + formatPropertyName(ListPropertyId.this);
}
@Override
@Nonnull
public String getCause(@Nonnull ConfigChecker checker) {
return "number of elements of " + formatPropertyName(checker, ListPropertyId.this);
}
};
}
@Nonnull
private String format(@Nonnull String str, boolean empty) {
StringBuilder sb = new StringBuilder();
sb.append(str);
sb.append(" is ");
if (!empty) {
sb.append("not ");
}
sb.append("empty");
return sb.toString();
}
}
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