ClassEntry.java

/*******************************************************************************
 * Copyright (c) 2015 Jeff Martin.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public
 * License v3.0 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * Contributors:
 * Jeff Martin - initial API and implementation
 ******************************************************************************/
package cuchaz.enigma.mapping;

import java.io.Serializable;
import java.util.List;

import com.google.common.collect.Lists;

public class ClassEntry implements Entry, Serializable
{
	
	private static final long serialVersionUID = 4235460580973955811L;
	
	private String m_name;
	
	public ClassEntry(String className)
	{
		if(className == null)
			throw new IllegalArgumentException("Class name cannot be null!");
		if(className.indexOf('.') >= 0)
			throw new IllegalArgumentException(
				"Class name must be in JVM format. ie, path/to/package/class$inner : "
					+ className);
		
		m_name = className;
		
		if(isInnerClass() && getInnermostClassName().indexOf('/') >= 0)
			throw new IllegalArgumentException(
				"Inner class must not have a package: " + className);
	}
	
	public ClassEntry(ClassEntry other)
	{
		m_name = other.m_name;
	}
	
	@Override
	public String getName()
	{
		return m_name;
	}
	
	@Override
	public String getClassName()
	{
		return m_name;
	}
	
	@Override
	public ClassEntry getClassEntry()
	{
		return this;
	}
	
	@Override
	public ClassEntry cloneToNewClass(ClassEntry classEntry)
	{
		return classEntry;
	}
	
	@Override
	public int hashCode()
	{
		return m_name.hashCode();
	}
	
	@Override
	public boolean equals(Object other)
	{
		if(other instanceof ClassEntry)
			return equals((ClassEntry)other);
		return false;
	}
	
	public boolean equals(ClassEntry other)
	{
		return m_name.equals(other.m_name);
	}
	
	@Override
	public String toString()
	{
		return m_name;
	}
	
	public boolean isInnerClass()
	{
		return m_name.lastIndexOf('$') >= 0;
	}
	
	public List<String> getClassChainNames()
	{
		return Lists.newArrayList(m_name.split("\\$"));
	}
	
	public List<ClassEntry> getClassChain()
	{
		List<ClassEntry> entries = Lists.newArrayList();
		StringBuilder buf = new StringBuilder();
		for(String name : getClassChainNames())
		{
			if(buf.length() > 0)
				buf.append("$");
			buf.append(name);
			entries.add(new ClassEntry(buf.toString()));
		}
		return entries;
	}
	
	public String getOutermostClassName()
	{
		if(isInnerClass())
			return m_name.substring(0, m_name.indexOf('$'));
		return m_name;
	}
	
	public ClassEntry getOutermostClassEntry()
	{
		return new ClassEntry(getOutermostClassName());
	}
	
	public String getOuterClassName()
	{
		if(!isInnerClass())
			throw new Error("This is not an inner class!");
		return m_name.substring(0, m_name.lastIndexOf('$'));
	}
	
	public ClassEntry getOuterClassEntry()
	{
		return new ClassEntry(getOuterClassName());
	}
	
	public String getInnermostClassName()
	{
		if(!isInnerClass())
			throw new Error("This is not an inner class!");
		return m_name.substring(m_name.lastIndexOf('$') + 1);
	}
	
	public boolean isInDefaultPackage()
	{
		return m_name.indexOf('/') < 0;
	}
	
	public String getPackageName()
	{
		int pos = m_name.lastIndexOf('/');
		if(pos > 0)
			return m_name.substring(0, pos);
		return null;
	}
	
	public String getSimpleName()
	{
		int pos = m_name.lastIndexOf('/');
		if(pos > 0)
			return m_name.substring(pos + 1);
		return m_name;
	}
	
	public ClassEntry buildClassEntry(List<ClassEntry> classChain)
	{
		assert classChain.contains(this);
		StringBuilder buf = new StringBuilder();
		for(ClassEntry chainEntry : classChain)
		{
			if(buf.length() == 0)
				buf.append(chainEntry.getName());
			else
			{
				buf.append("$");
				buf.append(chainEntry.isInnerClass() ? chainEntry
					.getInnermostClassName() : chainEntry.getSimpleName());
			}
			
			if(chainEntry == this)
				break;
		}
		return new ClassEntry(buf.toString());
	}
}