/* Copyright (C) 2004 - 2010  Versant Inc.  http://www.db4o.com */

package sharpen.core.framework;

import static sharpen.core.framework.BindingUtils.isStatic;

import org.eclipse.jdt.core.dom.*;

import java.util.List;

public class StaticImports {

	public static boolean isStaticMethodImport(ImportDeclaration imp, IMethodBinding method) {
		try {
			final IBinding binding = imp.resolveBinding();
			switch (binding.getKind()) {
			case IBinding.TYPE:
				return imp.isOnDemand() && method.getDeclaringClass() == binding;
			case IBinding.METHOD:
				IMethodBinding bound = (IMethodBinding) binding;
				return bound.getDeclaringClass() == method.getDeclaringClass() && binding.getName().equals(method.getMethodDeclaration().getName());
			}
		} catch (Exception e) {
			// FIXME: We sometimes throw a NullReferenceException here for apparently
			//        no reason; Eclipse bug ?
			//
			// This can be fixed by adding a <binding> entry for to
			// the referenced type.
		}
		return false;
	}

	public static boolean isStaticFieldImport(ImportDeclaration imp, IVariableBinding field) {
		try {
			final IBinding binding = imp.resolveBinding();
			if (binding == null)
				return false;
			switch (binding.getKind()) {
			case IBinding.TYPE:
				return imp.isOnDemand() && field.getDeclaringClass() == binding;
			case IBinding.VARIABLE:
				return binding == field;
			}
		} catch (Exception e) {
			// FIXME: We sometimes throw a NullReferenceException here for apparently
			//        no reason; Eclipse bug ?
			//
			// This can be fixed by adding a <binding> entry for to
			// the referenced type.
		}

		return false;
	}

	public static boolean isStaticImport(IMethodBinding method, List imports) {
		if (!isStatic(method))
			return false;
		for (Object imp : imports)
			if (isStaticMethodImport((ImportDeclaration) imp, method))
				return true;

		return false;
	}

	public static boolean isStaticImport(IVariableBinding field, List imports) {
		if (!isStatic(field))
			return false;
		for (Object imp : imports)
			if (isStaticFieldImport((ImportDeclaration) imp, field))
				return true;

		return false;
	}

	public static IMethodBinding staticImportMethodBinding(SimpleName node, List imports) {
		if (node.getLocationInParent() != MethodInvocation.NAME_PROPERTY)
			return null;

		final MethodInvocation invocation = parentMethodInvocation(node);
		if (invocation.getExpression() != null)
			return null;

		final IMethodBinding method = invocation.resolveMethodBinding();

		if (!isStaticImport(method, imports))
			return null;

		return method;
	}

	private static MethodInvocation parentMethodInvocation(SimpleName node) {
		return ((MethodInvocation)node.getParent());
	}

}