| /******************************************************************************* |
| * Copyright (c) 2013, 2014 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.core.dom; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Lambda expression AST node type (added in JLS8 API). |
| * <pre> |
| * LambdaExpression: |
| * Identifier <b>-></b> Body |
| * <b>(</b> [ Identifier { <b>,</b> Identifier } ] <b>)</b> <b>-></b> Body |
| * <b>(</b> [ FormalParameter { <b>,</b> FormalParameter } ] <b>)</b> <b>-></b> Body |
| * </pre> |
| * |
| *<p> |
| * The first two forms use {@link VariableDeclarationFragment} for the parameter or parameters, |
| * while the third form uses {@link SingleVariableDeclaration}.</p> |
| *<p>The Body can be either a {@link Block} or an {@link Expression}.</p> |
| * |
| * @since 3.10 |
| * @noinstantiate This class is not intended to be instantiated by clients |
| */ |
| @SuppressWarnings({"rawtypes", "unchecked"}) |
| public class LambdaExpression extends Expression { |
| |
| /** |
| * The "parentheses" structural property of this node type (type: {@link Boolean}). |
| * <p> |
| * Note that parentheses are required unless {@link #parameters()} contains |
| * just a single {@link VariableDeclarationFragment}. |
| * ASTRewrite may ignore this property if necessary. |
| * </p> |
| */ |
| public static final SimplePropertyDescriptor PARENTHESES_PROPERTY = |
| new SimplePropertyDescriptor(LambdaExpression.class, "parentheses", boolean.class, MANDATORY); //$NON-NLS-1$ |
| |
| /** |
| * The "parameters" structural property of this node type (element type: {@link VariableDeclaration}). |
| * <p> |
| * Note that all elements must be of the same type, either all {@link SingleVariableDeclaration} or all {@link VariableDeclarationFragment}. |
| * </p> |
| */ |
| public static final ChildListPropertyDescriptor PARAMETERS_PROPERTY = |
| new ChildListPropertyDescriptor(LambdaExpression.class, "parameters", VariableDeclaration.class, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "body" structural property of this node type (child type: {@link ASTNode}, |
| * must be either a {@link Block} or an {@link Expression}). |
| */ |
| public static final ChildPropertyDescriptor BODY_PROPERTY = |
| new ChildPropertyDescriptor(LambdaExpression.class, "body", ASTNode.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * A list of property descriptors (element type: |
| * {@link StructuralPropertyDescriptor}), |
| * or null if uninitialized. |
| */ |
| private static final List PROPERTY_DESCRIPTORS_8_0; |
| |
| static { |
| List propertyList = new ArrayList(4); |
| createPropertyList(LambdaExpression.class, propertyList); |
| addProperty(PARENTHESES_PROPERTY, propertyList); |
| addProperty(PARAMETERS_PROPERTY, propertyList); |
| addProperty(BODY_PROPERTY, propertyList); |
| PROPERTY_DESCRIPTORS_8_0 = reapPropertyList(propertyList); |
| } |
| |
| /** |
| * Returns a list of structural property descriptors for this node type. |
| * Clients must not modify the result. |
| * |
| * @param apiLevel the API level; one of the AST.JLS* constants |
| * @return a list of property descriptors (element type: |
| * {@link StructuralPropertyDescriptor}) |
| */ |
| public static List propertyDescriptors(int apiLevel) { |
| return PROPERTY_DESCRIPTORS_8_0; |
| } |
| |
| /** |
| * Indicates whether parentheses are present or not. |
| * Defaults to <code>true</code>. |
| */ |
| private boolean hasParentheses = true; |
| |
| /** |
| * The parameter declarations |
| * (element type: {@link VariableDeclaration}). |
| * Defaults to an empty list. |
| */ |
| private ASTNode.NodeList parameters = |
| new ASTNode.NodeList(PARAMETERS_PROPERTY); |
| |
| /** |
| * The method body. |
| * The method body; lazily initialized, defaults to an empty Block. |
| */ |
| private ASTNode body = null; |
| |
| /** |
| * Creates a new AST node for a LambdaExpression declaration owned |
| * by the given AST. |
| * <p> |
| * N.B. This constructor is package-private; all subclasses must be |
| * declared in the same package; clients are unable to declare |
| * additional subclasses. |
| * </p> |
| * |
| * @param ast the AST that is to own this node |
| */ |
| LambdaExpression(AST ast) { |
| super(ast); |
| unsupportedIn2_3_4(); |
| } |
| |
| @Override |
| final List internalStructuralPropertiesForType(int apiLevel) { |
| return propertyDescriptors(apiLevel); |
| } |
| |
| @Override |
| final boolean internalGetSetBooleanProperty(SimplePropertyDescriptor property, boolean get, boolean value) { |
| if (property == PARENTHESES_PROPERTY) { |
| if (get) { |
| return hasParentheses(); |
| } else { |
| setParentheses(value); |
| return false; |
| } |
| } |
| // allow default implementation to flag the error |
| return super.internalGetSetBooleanProperty(property, get, value); |
| } |
| |
| @Override |
| final List internalGetChildListProperty(ChildListPropertyDescriptor property) { |
| if (property == PARAMETERS_PROPERTY) { |
| return parameters(); |
| } |
| // allow default implementation to flag the error |
| return super.internalGetChildListProperty(property); |
| } |
| |
| @Override |
| final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) { |
| if (property == BODY_PROPERTY) { |
| if (get) { |
| return getBody(); |
| } else { |
| setBody( child); |
| return null; |
| } |
| } |
| // allow default implementation to flag the error |
| return super.internalGetSetChildProperty(property, get, child); |
| } |
| |
| @Override |
| final int getNodeType0() { |
| return LAMBDA_EXPRESSION; |
| } |
| |
| @Override |
| ASTNode clone0(AST target) { |
| LambdaExpression result = new LambdaExpression(target); |
| result.setSourceRange(getStartPosition(), getLength()); |
| result.setParentheses(hasParentheses()); |
| result.parameters().addAll(ASTNode.copySubtrees(target, parameters())); |
| result.setBody(ASTNode.copySubtree(target, getBody())); |
| return result; |
| } |
| |
| @Override |
| final boolean subtreeMatch0(ASTMatcher matcher, Object other) { |
| // dispatch to correct overloaded match method |
| return matcher.match(this, other); |
| } |
| |
| @Override |
| void accept0(ASTVisitor visitor) { |
| boolean visitChildren = visitor.visit(this); |
| if (visitChildren) { |
| // visit children in normal left to right reading order |
| acceptChildren(visitor, this.parameters); |
| acceptChild(visitor, getBody()); |
| } |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns whether parentheses around the parameters are present or not. |
| * <p> |
| * Note that parentheses are required unless {@link #parameters()} contains |
| * just a single {@link VariableDeclarationFragment}. |
| * ASTRewrite may ignore this property if necessary. |
| * </p> |
| * |
| * @return <code>true</code> if this lambda expression has parentheses around |
| * its parameters and <code>false</code> otherwise |
| */ |
| public boolean hasParentheses() { |
| return this.hasParentheses; |
| } |
| |
| /** |
| * Sets whether this lambda expression has parentheses around its parameters or not. |
| * <p> |
| * Note that parentheses are required unless {@link #parameters()} contains |
| * just a single {@link VariableDeclarationFragment}. |
| * ASTRewrite may ignore this property if necessary. |
| * </p> |
| * |
| * @param hasParentheses <code>true</code> if this lambda expression has parentheses around its parameters |
| * and <code>false</code> otherwise |
| */ |
| public void setParentheses(boolean hasParentheses) { |
| preValueChange(PARENTHESES_PROPERTY); |
| this.hasParentheses = hasParentheses; |
| postValueChange(PARENTHESES_PROPERTY); |
| } |
| |
| /** |
| * Returns the live ordered list of formal parameters of this lambda expression. |
| * Note that all elements must be of the same type, either |
| * <ul> |
| * <li>all {@link SingleVariableDeclaration} (explicit type), or</li> |
| * <li>all {@link VariableDeclarationFragment} (inferred type).</li> |
| * </ul> |
| * |
| * @return the live list of formal parameters of this lambda expression |
| * (element type: {@link VariableDeclaration}) |
| */ |
| public List parameters() { |
| return this.parameters; |
| } |
| |
| /** |
| * Returns the body of this lambda expression. |
| * |
| * @return the lambda expression body, which can be either a {@link Block} or an {@link Expression} |
| */ |
| public ASTNode getBody() { |
| if (this.body == null) { |
| // lazy init must be thread-safe for readers |
| synchronized (this) { |
| if (this.body == null) { |
| preLazyInit(); |
| this.body = new Block(this.ast); |
| postLazyInit(this.body, BODY_PROPERTY); |
| } |
| } |
| } |
| return this.body; |
| } |
| |
| /** |
| * Sets the body of this lambda expression. |
| * |
| * @param body a block node or an expression node |
| * @exception IllegalArgumentException if: |
| * <ul> |
| * <li>the node belongs to a different AST</li> |
| * <li>the node already has a parent</li> |
| * <li>a cycle in would be created</li> |
| * <li>body is neither a {@link Block} nor an {@link Expression}</li> |
| * </ul> |
| */ |
| public void setBody(ASTNode body) { |
| if (!(body instanceof Expression || body instanceof Block)) { |
| throw new IllegalArgumentException(); |
| } |
| ASTNode oldChild = this.body; |
| preReplaceChild(oldChild, body, BODY_PROPERTY); |
| this.body = body; |
| postReplaceChild(oldChild, body, BODY_PROPERTY); |
| } |
| |
| /** |
| * Resolves and returns the binding for the lambda expression |
| * <p> |
| * Note that bindings are generally unavailable unless requested when the |
| * AST is being built. |
| * </p> |
| * |
| * @return the binding, or <code>null</code> if the binding cannot be |
| * resolved |
| */ |
| public IMethodBinding resolveMethodBinding() { |
| return this.ast.getBindingResolver().resolveMethod(this); |
| } |
| |
| @Override |
| int memSize() { |
| return BASE_NODE_SIZE + 3 * 4; |
| } |
| |
| @Override |
| int treeSize() { |
| return |
| memSize() |
| + this.parameters.listSize() |
| + (this.body == null ? 0 : getBody().treeSize()); |
| } |
| } |