com.documents4j.job.ImpossibleConverter Maven / Gradle / Ivy
package com.documents4j.job;
import com.documents4j.api.*;
import com.documents4j.throwables.ConversionFormatException;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
class ImpossibleConverter implements IConverter {
private static final String MESSAGE = "There is currently no converter accessible";
@Override
public IConversionJobWithSourceUnspecified convert(InputStream source) {
return new ImpossibleConversionJobWithSourceUnspecified();
}
@Override
public IConversionJobWithSourceUnspecified convert(InputStream source, boolean close) {
return new ImpossibleConversionJobWithSourceUnspecified();
}
@Override
public IConversionJobWithSourceUnspecified convert(IInputStreamSource source) {
return new ImpossibleConversionJobWithSourceUnspecified();
}
@Override
public IConversionJobWithSourceUnspecified convert(File source) {
return new ImpossibleConversionJobWithSourceUnspecified();
}
@Override
public IConversionJobWithSourceUnspecified convert(IFileSource source) {
return new ImpossibleConversionJobWithSourceUnspecified();
}
@Override
public Map> getSupportedConversions() {
return Collections.emptyMap();
}
@Override
public boolean isOperational() {
return false;
}
@Override
public void shutDown() {
}
@Override
public void kill() {
}
private static class ImpossibleConversionJobWithSourceUnspecified implements IConversionJobWithSourceUnspecified {
@Override
public IConversionJobWithSourceSpecified as(DocumentType sourceFormat) {
return new ImpossibleConversionJobWithSourceSpecified();
}
}
private static class ImpossibleConversionJobWithSourceSpecified implements IConversionJobWithSourceSpecified {
@Override
public IConversionJobWithTargetUnspecified to(File target) {
return new ImpossibleConversionJobWithTargetUnspecified(new NoOpExceptionCallback());
}
@Override
public IConversionJobWithTargetUnspecified to(File target, IFileConsumer callback) {
return new ImpossibleConversionJobWithTargetUnspecified(new FileConsumerExceptionCallback(target, callback));
}
@Override
public IConversionJobWithTargetUnspecified to(OutputStream target) {
return new ImpossibleConversionJobWithTargetUnspecified(new NoOpExceptionCallback());
}
@Override
public IConversionJobWithTargetUnspecified to(OutputStream target, boolean closeStream) {
return new ImpossibleConversionJobWithTargetUnspecified(new NoOpExceptionCallback());
}
@Override
public IConversionJobWithTargetUnspecified to(IInputStreamConsumer callback) {
return new ImpossibleConversionJobWithTargetUnspecified(new InputStreamConsumerExceptionCallback(callback));
}
}
private static class ImpossibleConversionJobWithTargetUnspecified implements IConversionJobWithTargetUnspecified {
private final ExceptionCallback exceptionCallback;
public ImpossibleConversionJobWithTargetUnspecified(ExceptionCallback exceptionCallback) {
this.exceptionCallback = exceptionCallback;
}
@Override
public IConversionJobWithPriorityUnspecified as(DocumentType targetFormat) {
return new ImpossibleConversionJobWithPriorityUnspecified(exceptionCallback);
}
}
private static class ImpossibleConversionJobWithPriorityUnspecified implements IConversionJobWithPriorityUnspecified {
private final ExceptionCallback exceptionCallback;
private ImpossibleConversionJobWithPriorityUnspecified(ExceptionCallback exceptionCallback) {
this.exceptionCallback = exceptionCallback;
}
@Override
public IConversionJob prioritizeWith(int priority) {
return this;
}
@Override
public ImpossibleConversionFuture schedule() {
ConversionFormatException exception = new ConversionFormatException(MESSAGE);
exceptionCallback.onException(exception);
return new ImpossibleConversionFuture(exception);
}
@Override
public boolean execute() {
ConversionFormatException exception = new ConversionFormatException(MESSAGE);
exceptionCallback.onException(exception);
throw exception;
}
}
private static class ImpossibleConversionFuture implements Future {
private final ConversionFormatException exception;
public ImpossibleConversionFuture(ConversionFormatException exception) {
this.exception = exception;
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return false;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return true;
}
@Override
public Boolean get() throws ExecutionException {
throw new ExecutionException(exception);
}
@Override
public Boolean get(long timeout, TimeUnit unit) throws ExecutionException {
return get();
}
}
private interface ExceptionCallback {
void onException(ConversionFormatException exception);
}
private static class FileConsumerExceptionCallback implements ExceptionCallback {
private final File target;
private final IFileConsumer callback;
public FileConsumerExceptionCallback(File target, IFileConsumer callback) {
this.target = target;
this.callback = callback;
}
@Override
public void onException(ConversionFormatException exception) {
callback.onException(target, exception);
}
}
private static class InputStreamConsumerExceptionCallback implements ExceptionCallback {
private final IInputStreamConsumer callback;
public InputStreamConsumerExceptionCallback(IInputStreamConsumer callback) {
this.callback = callback;
}
@Override
public void onException(ConversionFormatException exception) {
callback.onException(exception);
}
}
private static class NoOpExceptionCallback implements ExceptionCallback {
@Override
public void onException(ConversionFormatException exception) {
/* do nothing */
}
}
}