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StringMaker.java
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110 lines (93 loc) · 3.17 KB
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/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2026 SciJava developers.
* %%
* 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.
*
* 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 HOLDERS 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.
* #L%
*/
package org.scijava.util;
import java.util.Collection;
import java.util.Iterator;
/**
* Helper class for building up {@link String}s of key/value pairs.
*
* @author Curtis Rueden
*/
public final class StringMaker {
private final StringBuilder builder;
public StringMaker() {
builder = new StringBuilder();
}
public StringMaker(final String s) {
builder = new StringBuilder(s);
}
// -- Object methods --
@Override
public String toString() {
return builder.toString();
}
// -- StringMaker methods --
public void append(final String s) {
if (builder.length() > 0) builder.append(", ");
builder.append(s);
}
public void append(final String key, final Object value) {
append(key, value, null);
}
public void append(final String key, final Object value,
final Object defaultValue)
{
if (value == null || value.equals(defaultValue)) return;
final String s = makeString(value);
if (s == null) return;
if (builder.length() > 0) builder.append(", ");
builder.append(key + "=" + s);
}
// -- Helper methods --
private String makeString(final Object value) {
if (value == null) return null;
if (value instanceof String) {
final String s = (String) value;
if (s.isEmpty()) return null;
return "'" + s + "'";
}
if (value instanceof Class) {
final Class<?> c = (Class<?>) value;
return c.getSimpleName();
}
if (value instanceof Collection) {
final Collection<?> c = (Collection<?>) value;
if (c.isEmpty()) return null;
final StringBuilder sb = new StringBuilder();
final Iterator<?> iter = c.iterator();
while (iter.hasNext()) {
if (sb.length() > 0) sb.append(", ");
final Object o = iter.next();
sb.append(makeString(o));
}
return "{" + sb.toString() + "}";
}
return value.toString();
}
}