/*
* Copyright 2015 Kevin Herron
*
* 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.digitalpetri.opcua.stack.core.types.builtin;
import java.util.Arrays;
import java.util.Objects;
import java.util.Optional;
import javax.annotation.Nullable;
import com.digitalpetri.opcua.stack.core.Identifiers;
import com.digitalpetri.opcua.stack.core.serialization.UaEnumeration;
import com.digitalpetri.opcua.stack.core.serialization.UaStructure;
import com.digitalpetri.opcua.stack.core.util.ArrayUtil;
import com.digitalpetri.opcua.stack.core.util.TypeUtil;
import com.google.common.base.MoreObjects;
import com.google.common.base.MoreObjects.ToStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
public final class Variant {
public static final Variant NULL_VALUE = new Variant(null);
private final Object value;
/**
* Create a new Variant with a given value.
*
* @param value the value this Variant holds.
*/
public Variant(@Nullable Object value) {
if (value != null) {
boolean clazzIsArray = value.getClass().isArray();
Class<?> componentClazz = clazzIsArray ?
ArrayUtil.getType(value) : value.getClass();
checkArgument(clazzIsArray || !Variant.class.equals(componentClazz), "Variant cannot contain Variant");
checkArgument(!DataValue.class.equals(componentClazz), "Variant cannot contain DataValue");
checkArgument(!DiagnosticInfo.class.equals(componentClazz), "Variant cannot contain DiagnosticInfo");
}
this.value = value;
}
public Optional<NodeId> getDataType() {
if (value == null) return Optional.empty();
if (value instanceof UaStructure) {
return Optional.of(((UaStructure) value).getTypeId());
} else if (value instanceof UaEnumeration) {
return Optional.of(Identifiers.Int32);
} else {
Class<?> clazz = value.getClass().isArray() ?
ArrayUtil.getType(value) : value.getClass();
int typeId = TypeUtil.getBuiltinTypeId(clazz);
return typeId == -1 ?
Optional.empty() : Optional.of(new NodeId(0, typeId));
}
}
public Object getValue() {
return value;
}
public boolean isNull() {
return value == null;
}
public boolean isNotNull() {
return !isNull();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Variant variant = (Variant) o;
return Objects.deepEquals(value, variant.value);
}
@Override
public int hashCode() {
return Objects.hash(valueHash());
}
private int valueHash() {
if (value instanceof Object[]) {
return Arrays.deepHashCode((Object[]) value);
} else if (value instanceof boolean[]) {
return Arrays.hashCode((boolean[]) value);
} else if (value instanceof byte[]) {
return Arrays.hashCode((byte[]) value);
} else if (value instanceof short[]) {
return Arrays.hashCode((short[]) value);
} else if (value instanceof int[]) {
return Arrays.hashCode((int[]) value);
} else if (value instanceof long[]) {
return Arrays.hashCode((long[]) value);
} else if (value instanceof float[]) {
return Arrays.hashCode((float[]) value);
} else if (value instanceof double[]) {
return Arrays.hashCode((double[]) value);
} else {
return Objects.hashCode(value);
}
}
@Override
public String toString() {
ToStringHelper helper = MoreObjects.toStringHelper(this);
helper.add("value", value);
return helper.toString();
}
}