org.archive.util.anvl.Element Maven / Gradle / Ivy
/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA licenses this file to You 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 org.archive.util.anvl;
/**
* ANVL 'data element'.
* Made of a lone {@link Label}, or a {@link Label} plus {@link Value}.
*
* @author stack
* @see A Name-Value
* Language (ANVL)
*/
public class Element {
private final SubElement [] subElements;
public Element(final Label l) {
this.subElements = new SubElement [] {l};
}
public Element(final Label l, final Value v) {
this.subElements = new SubElement [] {l, v};
}
public boolean isValue() {
return this.subElements.length > 1;
}
public Label getLabel() {
return (Label)this.subElements[0];
}
public Value getValue() {
if (!isValue()) {
return null;
}
return (Value)this.subElements[1];
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < subElements.length; i++) {
sb.append(subElements[i].toString());
if (i == 0) {
// Add colon after Label.
sb.append(':');
if (isValue()) {
// Add space to intro the value.
sb.append(' ');
}
}
}
return sb.toString();
}
}