com.bigdata.bop.NV Maven / Gradle / Ivy
/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
[email protected]
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Aug 17, 2010
*/
package com.bigdata.bop;
import java.io.Serializable;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* A name-value pair.
*
* @author Bryan Thompson
* @version $Id$
*/
public class NV implements Serializable, Comparable {
/**
*
*/
private static final long serialVersionUID = -6919300153058191480L;
private final String name;
private final Object value;
public String getName() {
return name;
}
public Object getValue() {
return value;
}
public String toString() {
return name + "=" + value;
}
/**
*
* @throws IllegalArgumentException
* if the name is null.
*/
public NV(final String name, final Object value) {
if (name == null)
throw new IllegalArgumentException();
// if (value == null)
// throw new IllegalArgumentException();
this.name = name;
this.value = value;
}
public int hashCode() {
return name.hashCode();
}
public boolean equals(final Object o) {
if (this == o)
return true;
if (!(o instanceof NV))
return false;
return name.equals(((NV) o).name) && value.equals(((NV) o).value);
}
/**
* Places into order by name.
*/
public int compareTo(final NV o) {
return name.compareTo(o.name);
}
/**
* Combines the two arrays, appending the contents of the 2nd array to the
* contents of the first array.
*
* @param a
* @param b
* @return
*/
public static NV[] concat(final NV[] a, final NV[] b) {
if (a == null && b == null)
return a;
if (a == null)
return b;
if (b == null)
return a;
final NV[] c = new NV[a.length + b.length];
// (NV[]) java.lang.reflect.Array.newInstance(a.getClass()
// .getComponentType(), a.length + b.length);
System.arraycopy(a, 0, c, 0, a.length);
System.arraycopy(b, 0, c, a.length, b.length);
return c;
}
/**
* Wrap a single name and value as a map.
*
* @param name
* The key.
* @param val
* The value.
*
* @return The map.
*/
static public Map asMap(final String name, final Object val) {
final Map tmp = new LinkedHashMap(1);
tmp.put(name, val);
return tmp;
}
/**
* Wrap name/value pairs as a map.
*
* @param nameValuePairs
* Pairs each being a string followed by an object, being the
* name value pair in the resulting map.
*
* @return The map.
*/
static public Map asMap(final Object... nameValuePairs) {
if (nameValuePairs.length % 2 != 0)
throw new IllegalArgumentException();
final Map rslt = new LinkedHashMap(
nameValuePairs.length / 2);
for (int i = 0; i < nameValuePairs.length; i += 2) {
rslt.put((String) nameValuePairs[i], nameValuePairs[i + 1]);
}
return rslt;
}
/**
* Wrap an array name/value pairs as a {@link Map}.
*
* @param a
* The array.
*
* @return The map.
*/
static public Map asMap(final NV... a) {
/*
* Note: Not possible for modifiable BOps (AST).
*/
// if (a.length == 1) {
//
// return Collections.singletonMap(a[0].name, a[0].value);
//
// }
final Map tmp = new LinkedHashMap(
a.length);
for (int i = 0; i < a.length; i++) {
tmp.put(a[i].name, a[i].value);
}
return tmp;
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy