Java TryStatement类代码示例

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
public void complainIfUnusedExceptionHandlers(BlockScope scope,TryStatement tryStatement) {
	// report errors for unreachable exception handlers
	for (int index = 0, count = this.handledExceptions.length; index < count; index++) {
		int cacheIndex = index / ExceptionHandlingFlowContext.BitCacheSize;
		int bitMask = 1 << (index % ExceptionHandlingFlowContext.BitCacheSize);
		if ((this.isReached[cacheIndex] & bitMask) == 0) {
			scope.problemReporter().unreachableCatchBlock(
				this.handledExceptions[index],
				getExceptionType(index));
		} else {
			if ((this.isNeeded[cacheIndex] & bitMask) == 0) {
				scope.problemReporter().hiddenCatchBlock(
					this.handledExceptions[index],
					getExceptionType(index));
			}
		}
	}
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
@Override
public void endVisit(TryStatement x, BlockScope scope) {
  try {
    SourceInfo info = makeSourceInfo(x);

    JBlock finallyBlock = pop(x.finallyBlock);
    List<JBlock> catchBlocks = pop(x.catchBlocks);
    JBlock tryBlock = pop(x.tryBlock);

    List<JLocalRef> catchArgs = new ArrayList<JLocalRef>();
    if (x.catchBlocks != null) {
      for (Argument argument : x.catchArguments) {
        JLocal local = (JLocal) curMethod.locals.get(argument.binding);
        catchArgs.add(new JLocalRef(info, local));
      }
    }
    push(new JTryStatement(info, tryBlock, catchArgs, catchBlocks, finallyBlock));
  } catch (Throwable e) {
    throw translateException(x, e);
  }
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
/**
 * Certain ECJ versions that only go up to -source 6 report that they support -source 7 and even fail to error when -source 7 is applied.
 * We detect this and correctly say that no more than -source 6 is supported. (when this is the case, this method returns false).
 */
private static boolean ecjSupportsJava7Features() {
	try {
		TryStatement.class.getDeclaredField("resources");
		return true;
	} catch (NoSuchFieldException e) {
		return false;
	}
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
/**
 * Finds the thrown exceptions minus the ones that are already caught in previous catch blocks.
 * Exception is already caught even if its super type is being caught. Also computes, separately,
 * a list comprising of (a)those exceptions that have been caught already and (b)those exceptions that are thrown
 * by the method and whose super type has been caught already. 
 * @param tryStatement
 * @param scope
 */
public void processThrownExceptions(TryStatement tryStatement, BlockScope scope) {
	this.thrownExceptions = new SimpleSet();
	this.exceptionsStack = new Stack();
	this.caughtExceptions = new SimpleSet();
	this.discouragedExceptions = new SimpleSet();
	tryStatement.traverse(this, scope);
	removeCaughtExceptions(tryStatement, true /*remove unchecked exceptions this time*/);
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
public ExceptionHandlingFlowContext(
		FlowContext parent,
		TryStatement tryStatement,
		ReferenceBinding[] handledExceptions,
		int [] exceptionToCatchBlockMap,
		FlowContext initializationParent,
		BlockScope scope,
		FlowInfo flowInfo) {
	this(parent, tryStatement, handledExceptions, exceptionToCatchBlockMap, 
			tryStatement.catchArguments, initializationParent, scope, flowInfo.unconditionalInits());
	this.initsOnFinally = flowInfo.unconditionalCopy();
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
@Override
public boolean visit(TryStatement x, BlockScope scope) {
  try {
    if (x.catchBlocks != null) {
      for (Argument argument : x.catchArguments) {
        createLocal(argument);
      }
    }
    return true;
  } catch (Throwable e) {
    throw translateException(x, e);
  }
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
@Override public boolean visit(TryStatement node, BlockScope scope) {
	fixPositions(setGeneratedBy(node, source));
	return super.visit(node, scope);
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
private void removeCaughtExceptions(TryStatement tryStatement, boolean recordUncheckedCaughtExceptions) {
	Argument[] catchArguments = tryStatement.catchArguments;
	int length = catchArguments == null ? 0 : catchArguments.length;
	for (int i = 0; i < length; i++) {
		if (catchArguments[i].type instanceof UnionTypeReference) {
			UnionTypeReference unionTypeReference = (UnionTypeReference) catchArguments[i].type;
			TypeBinding caughtException;
			for (int j = 0; j < unionTypeReference.typeReferences.length; j++) {
				caughtException = unionTypeReference.typeReferences[j].resolvedType;
				if ((caughtException instanceof ReferenceBinding) && caughtException.isValidBinding()) {	// might be null when its the completion node
					if (recordUncheckedCaughtExceptions) {
						// is in outermost try-catch. Remove all caught exceptions, unchecked or checked
						removeCaughtException((ReferenceBinding)caughtException);
						this.caughtExceptions.add(caughtException);
					} else {
						// is in some inner try-catch. Discourage already caught checked exceptions
						// from being proposed in an outer catch.
						if (!caughtException.isUncheckedException(true)) {
							this.discouragedExceptions.add(caughtException);
						}
					}
				}
			}
		} else {
			TypeBinding exception = catchArguments[i].type.resolvedType;
			if ((exception instanceof ReferenceBinding) && exception.isValidBinding()) {
				if (recordUncheckedCaughtExceptions) {
					// is in outermost try-catch. Remove all caught exceptions, unchecked or checked
					removeCaughtException((ReferenceBinding)exception);
					this.caughtExceptions.add(exception);
				} else {
					// is in some inner try-catch. Discourage already caught checked exceptions
					// from being proposed in an outer catch
					if (!exception.isUncheckedException(true)) {
						this.discouragedExceptions.add(exception);
					}
				}
			}
		}
	}
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
private void formatTryResources(
		TryStatement tryStatement,
		boolean spaceBeforeOpenParen,
		boolean spaceBeforeClosingParen,
		boolean spaceBeforeFirstResource,
		boolean spaceBeforeSemicolon,
		boolean spaceAfterSemicolon,
		int tryResourcesAligment) {

	LocalDeclaration[] resources = tryStatement.resources;
	int length = resources != null ? resources.length : 0;
	if (length > 0) {
		this.scribe.printNextToken(TerminalTokens.TokenNameLPAREN, spaceBeforeOpenParen);
		if (spaceBeforeFirstResource) {
			this.scribe.space();
		}
		Alignment resourcesAlignment = this.scribe.createAlignment(
				Alignment.TRY_RESOURCES,
				tryResourcesAligment,
				// make sure alignment options for try with resources takes precedence
				Alignment.R_OUTERMOST,
				length,
				this.scribe.scanner.currentPosition);
		this.scribe.enterAlignment(resourcesAlignment);
		boolean ok = false;
		do {
			switch (tryResourcesAligment & Alignment.SPLIT_MASK) {
				case Alignment.M_COMPACT_SPLIT:
				case Alignment.M_NEXT_PER_LINE_SPLIT:
					resourcesAlignment.startingColumn = this.scribe.column;
					break;
			}
			try {
				for (int i = 0; i < length; i++) {
					if (i > 0) {
						this.scribe.printNextToken(TerminalTokens.TokenNameSEMICOLON, spaceBeforeSemicolon);
						this.scribe.printComment(CodeFormatter.K_UNKNOWN, Scribe.BASIC_TRAILING_COMMENT);
						if (this.scribe.lastNumberOfNewLines == 1) {
							// a new line has been inserted while printing the comment
							// hence we need to use the break indentation level before printing next token...
							this.scribe.indentationLevel = resourcesAlignment.breakIndentationLevel;
						}
					}
					this.scribe.alignFragment(resourcesAlignment, i);
					if (i == 0) {
						int fragmentIndentation = resourcesAlignment.fragmentIndentations[0];
						if ((resourcesAlignment.mode & Alignment.M_INDENT_ON_COLUMN) != 0 && fragmentIndentation > 0) {
							this.scribe.indentationLevel = fragmentIndentation;
						}
					} else if (spaceAfterSemicolon) {
						this.scribe.space();
					}
					resources[i].traverse(this, null);
					resourcesAlignment.startingColumn = -1;
				}
				ok = true;
			} catch (AlignmentException e) {
				this.scribe.redoAlignment(e);
			}
		} while (!ok);
		
		this.scribe.exitAlignment(resourcesAlignment, true);
		if (isNextToken(TerminalTokens.TokenNameSEMICOLON)) {
			// take care of trailing semicolon
			this.scribe.printNextToken(TerminalTokens.TokenNameSEMICOLON, spaceBeforeSemicolon);
		}
		this.scribe.printNextToken(TerminalTokens.TokenNameRPAREN, spaceBeforeClosingParen);
	}
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
/**
 * @see org.eclipse.jdt.internal.compiler.ASTVisitor#visit(org.eclipse.jdt.internal.compiler.ast.TryStatement, org.eclipse.jdt.internal.compiler.lookup.BlockScope)
 */
public boolean visit(TryStatement tryStatement, BlockScope scope) {

	this.scribe.printNextToken(TerminalTokens.TokenNametry);
	formatTryResources(
			tryStatement, 
			this.preferences.insert_space_before_opening_paren_in_try, 
			this.preferences.insert_space_before_closing_paren_in_try,
			this.preferences.insert_space_after_opening_paren_in_try,
			this.preferences.insert_space_before_semicolon_in_try_resources,
			this.preferences.insert_space_after_semicolon_in_try_resources,
			this.preferences.alignment_for_resources_in_try);
	tryStatement.tryBlock.traverse(this, scope);
	if (tryStatement.catchArguments != null) {
		for (int i = 0, max = tryStatement.catchBlocks.length; i < max; i++) {
			if (this.preferences.insert_new_line_before_catch_in_try_statement) {
				this.scribe.printNewLine();
			}
			this.scribe.printNextToken(TerminalTokens.TokenNamecatch, this.preferences.insert_space_after_closing_brace_in_block);
			final int line = this.scribe.line;
			this.scribe.printNextToken(TerminalTokens.TokenNameLPAREN, this.preferences.insert_space_before_opening_paren_in_catch);

			if (this.preferences.insert_space_after_opening_paren_in_catch) {
				this.scribe.space();
			}
			tryStatement.catchArguments[i].traverse(this, scope);

			this.scribe.printNextToken(TerminalTokens.TokenNameRPAREN, this.preferences.insert_space_before_closing_paren_in_catch);

			formatLeftCurlyBrace(line, this.preferences.brace_position_for_block);
			tryStatement.catchBlocks[i].traverse(this, scope);
		}
	}
	if (tryStatement.finallyBlock != null) {
		if (this.preferences.insert_new_line_before_finally_in_try_statement) {
			this.scribe.printNewLine();
		}
		this.scribe.printNextToken(TerminalTokens.TokenNamefinally, this.preferences.insert_space_after_closing_brace_in_block);
		tryStatement.finallyBlock.traverse(this, scope);
	}
	return false;
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
protected void consumeStatementTry(boolean withFinally, boolean hasResources) {
	// TryStatement ::= 'try'  Block Catches
	// TryStatement ::= 'try'  Block Catchesopt Finally
	// TryStatementWithResources ::= 'try' ResourceSpecification TryBlock Catchesopt
	// TryStatementWithResources ::= 'try' ResourceSpecification TryBlock Catchesopt Finally
	
	int length;
	TryStatement tryStmt = new TryStatement();
	//finally
	if (withFinally) {
		this.astLengthPtr--;
		tryStmt.finallyBlock = (Block) this.astStack[this.astPtr--];
	}
	//catches are handle by two <argument-block> [see statementCatch]
	if ((length = this.astLengthStack[this.astLengthPtr--]) != 0) {
		if (length == 1) {
			tryStmt.catchBlocks = new Block[] {(Block) this.astStack[this.astPtr--]};
			tryStmt.catchArguments = new Argument[] {(Argument) this.astStack[this.astPtr--]};
		} else {
			Block[] bks = (tryStmt.catchBlocks = new Block[length]);
			Argument[] args = (tryStmt.catchArguments = new Argument[length]);
			while (length-- > 0) {
				bks[length] = (Block) this.astStack[this.astPtr--];
				args[length] = (Argument) this.astStack[this.astPtr--];
			}
		}
	}
	//try
	this.astLengthPtr--;
	tryStmt.tryBlock = (Block) this.astStack[this.astPtr--];

	if (hasResources) {
		// get the resources
		length = this.astLengthStack[this.astLengthPtr--];
		LocalDeclaration[] resources = new LocalDeclaration[length];
		System.arraycopy(
				this.astStack,
				(this.astPtr -= length) + 1,
				resources,
				0,
				length);
		tryStmt.resources = resources;
		if (this.options.sourceLevel < ClassFileConstants.JDK1_7) {
			problemReporter().autoManagedResourcesNotBelow17(resources);
		}
	}
	//positions
	tryStmt.sourceEnd = this.endStatementPosition;
	tryStmt.sourceStart = this.intStack[this.intPtr--];
	pushOnAstStack(tryStmt);
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
@Override public boolean visit(TryStatement node, BlockScope scope) {
	setGeneratedBy(node, source);
	applyOffsetASTNode(node);
	return super.visit(node, scope);
}
 

import org.eclipse.jdt.internal.compiler.ast.TryStatement; //导入依赖的package包/类
public void prepareSaveValueLocation(TryStatement targetTryStatement){

	// do nothing: no storage is necessary for snippets
}