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com.github.mustachejava.codes.IterableCode Maven / Gradle / Ivy
package com.github.mustachejava.codes;
import com.github.mustachejava.DefaultMustacheFactory;
import com.github.mustachejava.FragmentKey;
import com.github.mustachejava.Iteration;
import com.github.mustachejava.Mustache;
import com.github.mustachejava.MustacheException;
import com.github.mustachejava.TemplateContext;
import com.github.mustachejava.TemplateFunction;
import com.github.mustachejava.util.InternalArrayList;
import com.github.mustachejava.util.LatchedWriter;
import com.github.mustachejava.util.Node;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import static com.github.mustachejava.util.NodeValue.list;
public class IterableCode extends DefaultCode implements Iteration {
private final ExecutorService les;
public IterableCode(TemplateContext tc, DefaultMustacheFactory df, Mustache mustache, String variable, String type) {
super(tc, df, mustache, variable, type);
les = df.getExecutorService();
}
public IterableCode(TemplateContext tc, DefaultMustacheFactory df, Mustache mustache, String variable) {
this(tc, df, mustache, variable, "#");
}
@Override
public Writer execute(Writer writer, final List scopes) {
Object resolved = get(scopes);
writer = handle(writer, resolved, scopes);
appendText(writer);
return writer;
}
protected Writer handle(Writer writer, Object resolved, List scopes) {
if (resolved != null) {
if (resolved instanceof Function) {
writer = handleFunction(writer, (Function) resolved, scopes);
} else if (resolved instanceof Callable) {
writer = handleCallable(writer, (Callable) resolved, scopes);
} else {
writer = execute(writer, resolved, scopes);
}
}
return writer;
}
protected Writer handleCallable(Writer writer, final Callable callable, final List scopes) {
if (les == null) {
try {
writer = execute(writer, callable.call(), scopes);
} catch (Exception e) {
throw new MustacheException(e, tc);
}
} else {
// Flush the current writer
try {
writer.flush();
} catch (IOException e) {
throw new MustacheException("Failed to flush writer", e, tc);
}
final Writer originalWriter = writer;
final LatchedWriter latchedWriter = new LatchedWriter(writer);
writer = latchedWriter;
// Scopes must not cross thread boundaries as they
// are thread locally reused
final List newScopes = new InternalArrayList<>(scopes);
les.execute(() -> {
try {
Object call = callable.call();
Writer subWriter = handle(originalWriter, call, newScopes);
// Wait for the subwriter to complete
if (subWriter instanceof LatchedWriter) {
((LatchedWriter) subWriter).await();
}
// Tell the replacement writer that we are done
latchedWriter.done();
} catch (Throwable e) {
latchedWriter.failed(e);
}
});
}
return writer;
}
@SuppressWarnings("unchecked")
protected Writer handleFunction(Writer writer, Function function, List scopes) {
StringWriter sw = new StringWriter();
runIdentity(sw);
if (function instanceof TemplateFunction) {
Object newtemplate = function.apply(sw.toString());
if (newtemplate != null) {
String templateText = newtemplate.toString();
writer = writeTemplate(writer, templateText, scopes);
}
} else {
try {
StringWriter capture = new StringWriter();
writeTemplate(capture, sw.toString(), scopes).close();
Object apply = function.apply(capture.toString());
if (apply != null) {
writer.write(apply.toString());
}
} catch (IOException e) {
throw new MustacheException("Failed to write function result", e, tc);
}
}
return writer;
}
protected Writer writeTemplate(Writer writer, String templateText, List scopes) {
return df.getFragment(new FragmentKey(tc, templateText)).execute(writer, scopes);
}
protected Writer execute(Writer writer, Object resolve, List scopes) {
return oh.iterate(this, writer, resolve, scopes);
}
public Writer next(Writer writer, Object next, List scopes) {
boolean added = addScope(scopes, next);
writer = run(writer, scopes);
if (added) scopes.remove(scopes.size() - 1);
return writer;
}
@Override
public Node invert(Node node, String text, AtomicInteger position) {
int start = position.get();
List nodes = new ArrayList<>();
Node invert;
while ((invert = mustache.invert(new Node(), text, position)) != null) {
nodes.add(invert);
}
node.put(name, list(nodes));
return matchAppended(node, text, position, start);
}
}
