| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.model.language; |
| |
| import java.util.List; |
| |
| import javax.xml.bind.annotation.XmlAccessType; |
| import javax.xml.bind.annotation.XmlAccessorType; |
| import javax.xml.bind.annotation.XmlAttribute; |
| import javax.xml.bind.annotation.XmlID; |
| import javax.xml.bind.annotation.XmlRootElement; |
| import javax.xml.bind.annotation.XmlTransient; |
| import javax.xml.bind.annotation.XmlType; |
| import javax.xml.bind.annotation.XmlValue; |
| import javax.xml.bind.annotation.adapters.CollapsedStringAdapter; |
| import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Expression; |
| import org.apache.camel.Predicate; |
| import org.apache.camel.builder.PredicateBuilder; |
| import org.apache.camel.spi.Language; |
| import org.apache.camel.spi.Required; |
| import org.apache.camel.spi.RouteContext; |
| import org.apache.camel.util.CollectionStringBuffer; |
| import org.apache.camel.util.IntrospectionSupport; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * A useful base class for an expression |
| * |
| * @version |
| */ |
| @XmlRootElement |
| @XmlType(name = "expression") |
| @XmlAccessorType(XmlAccessType.FIELD) |
| public class ExpressionDefinition implements Expression, Predicate { |
| @XmlAttribute |
| @XmlJavaTypeAdapter(CollapsedStringAdapter.class) |
| @XmlID |
| private String id; |
| @XmlValue |
| private String expression; |
| @XmlTransient |
| private Predicate predicate; |
| @XmlTransient |
| private Expression expressionValue; |
| @XmlTransient |
| private ExpressionDefinition expressionType; |
| |
| public ExpressionDefinition() { |
| } |
| |
| public ExpressionDefinition(String expression) { |
| this.expression = expression; |
| } |
| |
| public ExpressionDefinition(Predicate predicate) { |
| this.predicate = predicate; |
| } |
| |
| public ExpressionDefinition(Expression expression) { |
| this.expressionValue = expression; |
| } |
| |
| public static String getLabel(List<ExpressionDefinition> expressions) { |
| CollectionStringBuffer buffer = new CollectionStringBuffer(); |
| for (ExpressionDefinition expression : expressions) { |
| buffer.append(expression.getLabel()); |
| } |
| return buffer.toString(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| if (getLanguage() != null) { |
| sb.append(getLanguage()).append("{"); |
| } |
| if (getPredicate() != null) { |
| sb.append(getPredicate().toString()); |
| } |
| if (getExpressionValue() != null) { |
| sb.append(getExpressionValue().toString()); |
| } |
| if (getPredicate() == null && getExpressionValue() == null && getExpression() != null) { |
| sb.append(getExpression()); |
| } |
| if (getLanguage() != null) { |
| sb.append("}"); |
| } |
| return sb.toString(); |
| } |
| |
| public Object evaluate(Exchange exchange) { |
| return evaluate(exchange, Object.class); |
| } |
| |
| public <T> T evaluate(Exchange exchange, Class<T> type) { |
| if (expressionValue == null) { |
| expressionValue = createExpression(exchange.getContext()); |
| } |
| ObjectHelper.notNull(expressionValue, "expressionValue"); |
| return expressionValue.evaluate(exchange, type); |
| } |
| |
| public void assertMatches(String text, Exchange exchange) throws AssertionError { |
| if (!matches(exchange)) { |
| throw new AssertionError(text + getExpression() + " for exchange: " + exchange); |
| } |
| } |
| |
| public boolean matches(Exchange exchange) { |
| if (predicate == null) { |
| predicate = createPredicate(exchange.getContext()); |
| } |
| ObjectHelper.notNull(predicate, "predicate"); |
| return predicate.matches(exchange); |
| } |
| |
| public String getLanguage() { |
| return ""; |
| } |
| |
| public final Predicate createPredicate(RouteContext routeContext) { |
| return createPredicate(routeContext.getCamelContext()); |
| } |
| |
| public Predicate createPredicate(CamelContext camelContext) { |
| if (predicate == null) { |
| if (getExpressionType() != null) { |
| predicate = getExpressionType().createPredicate(camelContext); |
| } else if (getExpressionValue() != null) { |
| predicate = PredicateBuilder.toPredicate(getExpressionValue()); |
| } else if (getExpression() != null) { |
| ObjectHelper.notNull("language", getLanguage()); |
| Language language = camelContext.resolveLanguage(getLanguage()); |
| predicate = language.createPredicate(getExpression()); |
| configurePredicate(camelContext, predicate); |
| } |
| } |
| return predicate; |
| } |
| |
| public final Expression createExpression(RouteContext routeContext) { |
| return createExpression(routeContext.getCamelContext()); |
| } |
| |
| public Expression createExpression(CamelContext camelContext) { |
| if (getExpressionValue() == null) { |
| if (getExpressionType() != null) { |
| setExpressionValue(getExpressionType().createExpression(camelContext)); |
| } else if (getExpression() != null) { |
| ObjectHelper.notNull("language", getLanguage()); |
| Language language = camelContext.resolveLanguage(getLanguage()); |
| setExpressionValue(language.createExpression(getExpression())); |
| configureExpression(camelContext, getExpressionValue()); |
| } |
| } |
| return getExpressionValue(); |
| } |
| |
| public String getExpression() { |
| return expression; |
| } |
| |
| @Required |
| public void setExpression(String expression) { |
| this.expression = expression; |
| } |
| |
| /** |
| * Gets the value of the id property. |
| */ |
| public String getId() { |
| return id; |
| } |
| |
| /** |
| * Sets the value of the id property. |
| */ |
| public void setId(String value) { |
| this.id = value; |
| } |
| |
| public Predicate getPredicate() { |
| return predicate; |
| } |
| |
| public Expression getExpressionValue() { |
| return expressionValue; |
| } |
| |
| protected void setExpressionValue(Expression expressionValue) { |
| this.expressionValue = expressionValue; |
| } |
| |
| public ExpressionDefinition getExpressionType() { |
| return expressionType; |
| } |
| |
| /** |
| * Returns some descriptive text to describe this node |
| */ |
| public String getLabel() { |
| String language = getExpression(); |
| if (ObjectHelper.isEmpty(language)) { |
| Predicate predicate = getPredicate(); |
| if (predicate != null) { |
| return predicate.toString(); |
| } |
| Expression expressionValue = getExpressionValue(); |
| if (expressionValue != null) { |
| return expressionValue.toString(); |
| } |
| } else { |
| return language; |
| } |
| return ""; |
| } |
| |
| /** |
| * Allows derived classes to set a lazily created expressionType instance |
| * such as if using the {@link org.apache.camel.builder.ExpressionClause} |
| */ |
| protected void setExpressionType(ExpressionDefinition expressionType) { |
| this.expressionType = expressionType; |
| } |
| |
| protected void configurePredicate(CamelContext camelContext, Predicate predicate) { |
| } |
| |
| protected void configureExpression(CamelContext camelContext, Expression expression) { |
| } |
| |
| /** |
| * Sets a named property on the object instance using introspection |
| */ |
| protected void setProperty(Object bean, String name, Object value) { |
| try { |
| IntrospectionSupport.setProperty(bean, name, value); |
| } catch (Exception e) { |
| throw new IllegalArgumentException("Failed to set property " + name + " on " + bean |
| + ". Reason: " + e, e); |
| } |
| } |
| } |