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A universal transaction manager that achieves database-agnostic transactions and distributed transactions that span multiple databases
package com.scalar.database.io;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ComparisonChain;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
/**
* A {@code Value} for a double precision floating point number
*
* @author Hiroyuki Yamada
*/
@Immutable
public final class DoubleValue implements Value {
private static final String ANONYMOUS = "";
private final String name;
private final double value;
/**
* Constructs a {@code DoubleValue} with the specified name and value
*
* @param name name of the {@code Value}
* @param value content of the {@code Value}
*/
public DoubleValue(String name, double value) {
this.name = checkNotNull(name);
this.value = value;
}
/**
* Constructs a {@code DoubleValue} with the specified value. The name of this value is anonymous.
*
* @param value content of the {@code Value}
*/
public DoubleValue(double value) {
this(ANONYMOUS, value);
}
/**
* Returns the content of this {@code Value}
*
* @return the content of this {@code Value}
*/
public double get() {
return value;
}
@Override
@Nonnull
public String getName() {
return name;
}
@Override
public DoubleValue copyWith(String name) {
return new DoubleValue(name, value);
}
@Override
public void accept(ValueVisitor v) {
v.visit(this);
}
@Override
public int hashCode() {
return Double.hashCode(value);
}
/**
* Indicates whether some other object is "equal to" this object. The other object is considered
* equal if:
*
*
* - both super class instances are equal and
*
- it is also an {@code DoubleValue} and
*
- both instances have the same name and value
*
*
* @param o an object to be tested for equality
* @return {@code true} if the other object is "equal to" this object otherwise {@code false}
*/
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof DoubleValue)) {
return false;
}
DoubleValue other = (DoubleValue) o;
return (this.name.equals(other.name) && this.value == other.value);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this).add("name", name).add("value", value).toString();
}
@Override
public int compareTo(DoubleValue o) {
return ComparisonChain.start().compare(this.value, o.value).compare(this.name, o.name).result();
}
}