/*
|
* %CopyrightBegin%
|
*
|
* Copyright Ericsson AB 2000-2009. All Rights Reserved.
|
*
|
* 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.
|
*
|
* %CopyrightEnd%
|
*/
|
package com.ericsson.otp.erlang;
|
|
/**
|
* Provides a Java representation of Erlang floats and doubles. Erlang defines
|
* only one floating point numeric type, however this class and its subclass
|
* {@link OtpErlangFloat} are used to provide representations corresponding to
|
* the Java types Double and Float.
|
*/
|
public class OtpErlangDouble extends OtpErlangObject {
|
// don't change this!
|
private static final long serialVersionUID = 132947104811974021L;
|
private final double d;
|
|
/**
|
* Create an Erlang float from the given double value.
|
*/
|
public OtpErlangDouble(final double d) {
|
this.d = d;
|
}
|
|
/**
|
* Create an Erlang float from a stream containing a double encoded in
|
* Erlang external format.
|
*
|
* @param buf the stream containing the encoded value.
|
* @throws OtpErlangDecodeException if the buffer does not contain a valid external
|
* representation of an Erlang float.
|
*/
|
public OtpErlangDouble(final OtpInputStream buf)
|
throws OtpErlangDecodeException {
|
d = buf.read_double();
|
}
|
|
/**
|
* Get the value, as a double.
|
*
|
* @return the value of this object, as a double.
|
*/
|
public double doubleValue() {
|
return d;
|
}
|
|
/**
|
* Get the value, as a float.
|
*
|
* @return the value of this object, as a float.
|
* @throws OtpErlangRangeException if the value cannot be represented as a float.
|
*/
|
public float floatValue() throws OtpErlangRangeException {
|
final float f = (float) d;
|
if (f != d) {
|
throw new OtpErlangRangeException("Value too large for float: " + d);
|
}
|
return f;
|
}
|
|
/**
|
* Get the string representation of this double.
|
*
|
* @return the string representation of this double.
|
*/
|
public String toString() {
|
return "" + d;
|
}
|
|
/**
|
* Convert this double to the equivalent Erlang external representation.
|
*
|
* @param buf an output stream to which the encoded value should be written.
|
*/
|
public void encode(final OtpOutputStream buf) {
|
buf.write_double(d);
|
}
|
|
/**
|
* Determine if two floats are equal. Floats are equal if they contain the
|
* same value.
|
*
|
* @param o the float to compare to.
|
* @return true if the floats have the same value.
|
*/
|
public boolean equals(final Object o) {
|
if (!(o instanceof OtpErlangDouble)) {
|
return false;
|
}
|
final OtpErlangDouble other = (OtpErlangDouble) o;
|
return d == other.d;
|
}
|
|
protected int doHashCode() {
|
final Double v = new Double(d);
|
return v.hashCode();
|
}
|
}
|