package com.cloudbees.groovy.cps.impl;
import com.cloudbees.groovy.cps.Block;
import com.cloudbees.groovy.cps.CatchExpression;
import com.cloudbees.groovy.cps.Continuation;
import com.cloudbees.groovy.cps.Env;
import com.cloudbees.groovy.cps.Next;
import java.util.Collections;
import java.util.List;
/**
* @author Kohsuke Kawaguchi
*/
public class TryCatchBlock implements Block {
private final List<CatchExpression> catches;
private final Block body;
private final Block finally_;
public TryCatchBlock(List<CatchExpression> catches, Block body, Block finally_) {
this.catches = catches;
this.body = body;
this.finally_ = finally_;
}
public Next eval(final Env e, final Continuation k) {
final TryBlockEnv f = new TryBlockEnv(e,finally_);
// possible evaluation of the finally block, if present.
for (final CatchExpression c : catches) {
f.addHandler(c.type, new Continuation() {
public Next receive(Object t) {
BlockScopeEnv b = new BlockScopeEnv(e);
b.declareVariable(c.type, c.name);
b.setLocalVariable(c.name, t);
// evaluate the body of the catch clause, with the finally block.
// that is, at the end of the catch block we want to run the finally block,
// and if any jump occurs from within (such as an exception thrown or a break statement),
// then we need to run the finally block first.
return new Next(
new TryCatchBlock(Collections.<CatchExpression>emptyList(), c.handler, finally_),
b, k);
}
});
}
// evaluate the body with the new environment
return new Next(body,f,f.withFinally(k));
}
private static final long serialVersionUID = 1L;
}