PathResolver.java

package org.kalisen.classpathdoctor;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ResourceBundle;

public class PathResolver {

	private VariableResolver varResolver = null;
	private String fileSeparator = null;

	public PathResolver() {
		// default constructor
	}

	public PathResolver(String fileSeparator) {
		this.fileSeparator = fileSeparator;
	}

	public PathEntry resolve(String path) {
		PathEntry result = null;
		if (path == null) {
			result = new InvalidPathEntry(path, ResourceBundle.getBundle(
					"UsersMessages").getString("null.is.not.a.valid.path"));
		} else if ("".equals(path)) {
			result = EmptyPathEntry.INSTANCE;
		} else {
			String expandedPath = null;
			expandedPath = getVariableResolver().resolve(path);
			try {
				URL url = new URL(expandedPath);
				result = new URLPath(url);
			} catch (MalformedURLException e) {
				File f = new File(expandedPath);
				if (f.isDirectory()) {
					result = new DirectoryPath(f, getFileSeparator());
				} else if (f.isFile()) {
					result = new JarPath(f);
				} else {
					result = new InvalidPathEntry(expandedPath, ResourceBundle
							.getBundle("UsersMessages").getString(
									"entry.doesnt.exist"));
				}
			}
		}
		return result;
	}

	public VariableResolver getVariableResolver() {
		if (this.varResolver == null) {
			this.varResolver = buildVariableResolver();
		}
		return this.varResolver;
	}

	private VariableResolver buildVariableResolver() {
		VariableResolver resolver = null;
		String pathSeparator = System.getProperty("path.separator");
		if (":".equals(pathSeparator)) {
			resolver = new UnixVariableResolver();
		} else {
			resolver = new WindowsVariableResolver();
		}
		return resolver;
	}

	public void setVariableResolver(VariableResolver varResolver) {
		if (varResolver == null) {
			throw new IllegalArgumentException(ResourceBundle.getBundle(
					"UsersMessages").getString("null.is.not.a.valid.argument"));
		}
		this.varResolver = varResolver;
	}

	public String getFileSeparator() {
		if (this.fileSeparator == null) {
			this.fileSeparator = System.getProperty("file.separator");
		}
		return this.fileSeparator;
	}

	public void setFileSeparator(String fileSeparator) {
		if (fileSeparator == null) {
			throw new IllegalArgumentException("null is not a valid argument");
		}
		this.fileSeparator = fileSeparator;
	}

}