io.honeybadger.com.jcabi.log.ListDecor Maven / Gradle / Ivy
/**
* Copyright (c) 2012-2014, jcabi.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the jcabi.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcabi.log;
import java.util.Arrays;
import java.util.Collection;
import java.util.Formattable;
import java.util.Formatter;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* Format list.
* @author Yegor Bugayenko ([email protected])
* @version $Id$
* @since 0.1
*/
@ToString
@EqualsAndHashCode(of = "list")
final class ListDecor implements Formattable {
/**
* The list.
*/
private final transient Collection list;
/**
* Public ctor.
* @param obj The object to format
* @throws DecorException If some problem with it
*/
ListDecor(final Object obj) throws DecorException {
if (obj == null || obj instanceof Collection) {
this.list = Collection.class.cast(obj);
} else if (obj instanceof Object[]) {
this.list = Arrays.asList((Object[]) obj);
} else {
throw new DecorException(
String.format(
"Collection or array required, while %s provided",
obj.getClass().getName()
)
);
}
}
/**
* {@inheritDoc}
* @checkstyle ParameterNumber (4 lines)
*/
@Override
public void formatTo(final Formatter formatter, final int flags,
final int width, final int precision) {
final StringBuilder builder = new StringBuilder(0);
builder.append('[');
if (this.list == null) {
builder.append("NULL");
} else {
boolean first = true;
for (final Object item : this.list) {
if (!first) {
builder.append(", ");
}
builder.append(String.format("\"%s\"", item));
first = false;
}
}
builder.append(']');
formatter.format("%s", builder.toString());
}
}