/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.revolsys.geometry.test.geomop;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.revolsys.geometry.model.Geometry;
import com.revolsys.geometry.test.testrunner.BooleanResult;
import com.revolsys.geometry.test.testrunner.DoubleResult;
import com.revolsys.geometry.test.testrunner.GeometryResult;
import com.revolsys.geometry.test.testrunner.IntegerResult;
import com.revolsys.geometry.test.testrunner.JTSTestReflectionException;
import com.revolsys.geometry.test.testrunner.Result;
/**
* Invokes a named operation on a set of arguments,
* the first of which is a {@link Geometry}.
* This class provides operations which are the methods
* defined on the Geometry class.
* Other {@link GeometryOperation} classes can delegate to
* instances of this class to run standard Geometry methods.
*
* @author Martin Davis
* @version 1.7
*/
public class GeometryMethodOperation implements GeometryOperation {
public static Class getGeometryReturnType(final String functionName) {
final Method[] methods = Geometry.class.getMethods();
for (final Method method : methods) {
if (method.getName().equalsIgnoreCase(functionName)) {
final Class returnClass = method.getReturnType();
/**
* Filter out only acceptable classes. (For instance, don't accept the
* relate()=>IntersectionMatrix method)
*/
if (returnClass == boolean.class || Geometry.class.isAssignableFrom(returnClass)
|| returnClass == double.class || returnClass == int.class) {
return returnClass;
}
}
}
return null;
}
public static boolean isBooleanFunction(final String name) {
return getGeometryReturnType(name) == boolean.class;
}
public static boolean isDoubleFunction(final String name) {
return getGeometryReturnType(name) == double.class;
}
public static boolean isGeometryFunction(final String name) {
return Geometry.class.isAssignableFrom(getGeometryReturnType(name));
}
public static boolean isIntegerFunction(final String name) {
return getGeometryReturnType(name) == int.class;
}
private static int nonNullItemCount(final Object[] obj) {
int count = 0;
for (final Object element : obj) {
if (element != null) {
count++;
}
}
return count;
}
private final Object[] convArg = new Object[1];
private final Method[] geometryMethods = Geometry.class.getMethods();
public GeometryMethodOperation() {
}
private boolean convertArg(final Class destClass, final Object srcValue, final Object[] convArg) {
convArg[0] = null;
if (srcValue instanceof String) {
return convertArgFromString(destClass, (String)srcValue, convArg);
}
if (destClass.isAssignableFrom(srcValue.getClass())) {
convArg[0] = srcValue;
return true;
}
return false;
}
private boolean convertArgFromString(final Class destClass, final String srcStr,
final Object[] convArg) {
convArg[0] = null;
if (destClass == Boolean.class || destClass == boolean.class) {
if (srcStr.equals("true")) {
convArg[0] = new Boolean(true);
return true;
} else if (srcStr.equals("false")) {
convArg[0] = new Boolean(false);
return true;
}
return false;
}
if (destClass == Integer.class || destClass == int.class) {
// try as an int
try {
convArg[0] = new Integer(srcStr);
return true;
} catch (final NumberFormatException e) {
// eat this exception
}
return false;
}
if (destClass == Double.class || destClass == double.class) {
// try as an int
try {
convArg[0] = new Double(srcStr);
return true;
} catch (final NumberFormatException e) {
// eat this exception
}
return false;
}
if (destClass == String.class) {
convArg[0] = srcStr;
return true;
}
return false;
}
private boolean convertArgs(final Class[] parameterTypes, final Object[] args,
final Object[] actualArgs) {
if (parameterTypes.length != nonNullItemCount(args)) {
return false;
}
for (int i = 0; i < args.length; i++) {
final boolean isCompatible = convertArg(parameterTypes[i], args[i], this.convArg);
if (!isCompatible) {
return false;
}
actualArgs[i] = this.convArg[0];
}
return true;
}
private Method getGeometryMethod(final String opName, final Object[] args,
final Object[] actualArgs) {
// could index methods by name for efficiency...
for (int i = 0; i < this.geometryMethods.length; i++) {
if (!this.geometryMethods[i].getName().equalsIgnoreCase(opName)) {
continue;
}
if (convertArgs(this.geometryMethods[i].getParameterTypes(), args, actualArgs)) {
return this.geometryMethods[i];
}
}
return null;
}
@Override
public Class getReturnType(final String opName) {
return getGeometryReturnType(opName);
}
@Override
public Result invoke(final String opName, final Geometry geometry, final Object[] args)
throws Exception {
final Object[] actualArgs = new Object[args.length];
final Method geomMethod = getGeometryMethod(opName, args, actualArgs);
if (geomMethod == null) {
throw new JTSTestReflectionException(opName, args);
}
return invokeMethod(geomMethod, geometry, actualArgs);
}
private Result invokeMethod(final Method method, final Geometry geometry, final Object[] args)
throws Exception {
try {
if (method.getReturnType() == boolean.class) {
return new BooleanResult((Boolean)method.invoke(geometry, args));
}
if (Geometry.class.isAssignableFrom(method.getReturnType())) {
final Geometry resultGeometry = (Geometry)method.invoke(geometry, args);
return new GeometryResult(resultGeometry);
}
if (method.getReturnType() == double.class) {
return new DoubleResult((Double)method.invoke(geometry, args));
}
if (method.getReturnType() == int.class) {
return new IntegerResult((Integer)method.invoke(geometry, args));
}
} catch (final InvocationTargetException e) {
final Throwable t = e.getTargetException();
if (t instanceof Exception) {
throw (Exception)t;
}
throw (Error)t;
}
throw new JTSTestReflectionException("Unsupported result type: " + method.getReturnType());
}
}