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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2000-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights 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.
*
* @exception 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.
*
* @exception 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.
*/
@Override
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.
*/
@Override
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.
*/
@Override
public boolean equals(final Object o) {
if (!(o instanceof OtpErlangDouble)) {
return false;
}
final OtpErlangDouble other = (OtpErlangDouble) o;
return d == other.d;
}
@Override
protected int doHashCode() {
final Double v = new Double(d);
return v.hashCode();
}
}
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