| /******************************************************************************* |
| * Copyright (c) 2000, 2008 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.core.internal.expressions; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.eclipse.core.expressions.EvaluationResult; |
| import org.eclipse.core.expressions.Expression; |
| import org.eclipse.core.expressions.ExpressionInfo; |
| import org.eclipse.core.expressions.IEvaluationContext; |
| |
| import org.eclipse.core.runtime.CoreException; |
| |
| public abstract class CompositeExpression extends Expression { |
| |
| private static final Expression[] EMPTY_ARRAY = new Expression[0]; |
| |
| /** |
| * The seed for the hash code for all composite expressions. |
| */ |
| private static final int HASH_INITIAL= CompositeExpression.class.getName().hashCode(); |
| |
| protected List<Expression> fExpressions; |
| |
| public void add(Expression expression) { |
| if (fExpressions == null) |
| fExpressions= new ArrayList<>(2); |
| fExpressions.add(expression); |
| } |
| |
| public Expression[] getChildren() { |
| if (fExpressions == null) |
| return EMPTY_ARRAY; |
| return fExpressions.toArray(new Expression[fExpressions.size()]); |
| } |
| |
| protected EvaluationResult evaluateAnd(IEvaluationContext scope) throws CoreException { |
| if (fExpressions == null) |
| return EvaluationResult.TRUE; |
| EvaluationResult result= EvaluationResult.TRUE; |
| for (Expression expression : fExpressions) { |
| result= result.and(expression.evaluate(scope)); |
| // keep iterating even if we have a not loaded found. It can be |
| // that we find a false which will result in a better result. |
| if (result == EvaluationResult.FALSE) |
| return result; |
| } |
| return result; |
| } |
| |
| protected EvaluationResult evaluateOr(IEvaluationContext scope) throws CoreException { |
| if (fExpressions == null) |
| return EvaluationResult.TRUE; |
| EvaluationResult result= EvaluationResult.FALSE; |
| for (Expression expression : fExpressions) { |
| result= result.or(expression.evaluate(scope)); |
| if (result == EvaluationResult.TRUE) |
| return result; |
| } |
| return result; |
| } |
| |
| @Override |
| public void collectExpressionInfo(ExpressionInfo info) { |
| if (fExpressions == null) |
| return; |
| for (Expression expression : fExpressions) { |
| expression.collectExpressionInfo(info); |
| } |
| } |
| |
| @Override |
| protected int computeHashCode() { |
| return HASH_INITIAL * HASH_FACTOR + hashCode(fExpressions); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder builder = new StringBuilder(getClass().getSimpleName()); |
| Expression[] children = getChildren(); |
| if (children.length > 0) { |
| builder.append(" [children="); //$NON-NLS-1$ |
| builder.append(Arrays.toString(children)); |
| builder.append("]"); //$NON-NLS-1$ |
| } |
| return builder.toString(); |
| } |
| |
| } |